2015-2016 - Nevada Department of Education
Contents
1. 393 205 a 2 Two or more web areas with cracks 393 205 a TUBELESS DEMOUNTABLE ADAPTER CRACKS 1 A crack exceeding 3 inches 76 2 mm 393 205 a 45 2 Cracks at three or more spokes 393 205 a WHEEL FASTNERS Loose missing broken cracked or stripped wheel fasteners that are ineffective as follows for 10 fastener positions 3 anywhere or 2 adjacent for 8 fastener positions or less 2 anywhere this applies to both spoke and disc wheels 393 205 c WELDS 1 Any cracks in welds attaching disc wheel disc to 393 205 a 2 Any crack in welds attaching tubeless demountable rim to adapter 393 205 a 3 Any welded repair on any aluminum wheel s 396 3 a 1 4 Any welded repair other than disc to rim attachment on steel disc wheel s 396 3 a 1 HUBS 1 When any axle bearing hub cap plug or filler plug is missing or broken allowing an open view into hub assembly 396 3 a 1 2 Smoking from wheel hub assembly due to bearing failure 396 3 a 1 NOTE Also refer to Brake Systems Brake Smoke Fire as the cause may either be the brakes or a problem in the hub and bearing area 3 When any wheel seal is leaking This must include evidence of wet contamination of the brake friction material and accompanied by evidence that further leaking will occur 396 5 b NOTE Refer to the applicable contaminated friction material criterion in Brake Systems when condition2. Any crack extending from the frame siderail web around the radius and into the bottom flange 393 201 a One inch 25 mm or longer crack in siderail bottom flange 393 201 a NOTE Items 1 and 2 above apply to all buses including those having unitized monocoque construction Items 3 and 4 apply only to buses having a body on chassis design such as most school buses WEB RADIUS TIRE and WHEEL CLEARANCE Any condition including loading that causes the body or frame to contact with a tire or any part of the wheel assemblies at the time of inspection 396 3 a 1 27 ROOF BODY STRUCTURE Applicable only to Carpenter School Buses 1 Any body structure area roof bow Carlin rail window post that is cracked 2 Any body structure area roof bow Carlin rail window post that has been welded and has cracked again or additional cracks appear in the structural area after initial welding has occurred is permanently scrapped 3 Any body structure area roof bow Carlin rail window post where 20 or more of the structural area is cracked will be scrapped 4 Any lower Carlin rail that is cracked all the way through will be scrapped NOTE Carpenter buses roof body structure will be required to be inspected yearly 8 FUEL SYSTEM A LIQUID FUELS 1 A fuel system with a dripping leak at any point including refrigerator or heater fuel systems 396 3 a 1 2 A fuel tank not
3. NOTE Verification is needed to ensure that the sound is not either internal to the fuel system such as gas flowing in a pressure regulator or pressure equalizing between manifold tanks or a leak in the air brake system c Any fuel leakage from the CNG or LPG system detected visibly evidence such as ice buildup or fuel system connections and fittings and verified by either a bubble test using non ammonia non corrosive soap solution or a flammable gas detection meter 396 3 a 1 NOTE Some brief fuel leakage or decompression may occur during refueling causing temporary frosting of CNG or LPG fuel system parts If the vehicle has been refueled shortly before inspection care must be taken to distinguish these temporary frosting occurrences from actual leaks 29 2 LNG OCCUPATIONAL SAFETY NOTE LNG is a cryogenic material and presents a potential safety hazard due both to the extremely cold temperature of its liquid and the flammability of its vapor Personnel inspecting such systems should exercise upmost caution including the wearing of proper eye protection gloves and clothing NOTE LNG liquid and vaporized gas is odorless and undetectable by the human sense of smell Frost buildup is not necessarily evidence of leakage Many components of LNG fuel systems are extremely cold and will exhibit an even coat of frost produced by moisture in the surrounding air condensing and freezing on them a A cloud of water
4. One or more leaves displaced in a manner that could result in contact with a tire rim brake drum or frame 393 207 c 7 Broken torsion bar spring in torsion bar suspension 393 207 e 8 Deflated air suspension one or more deflated air spring bag 393 207 f COMPOSITE SPRINGS 1 Intersecting cracks of any length 393 207 c 2 A crack that extends beyond 3 4 the length of the spring 393 207 c NOTE A crack is a separation in any axis which passes completely through the spring 39 Out of Service Conditions EE a Side to side crack extending beyond 3 4 of the length of the spring A crack that extends beyond 3 4 the length of the spring PRE A A A b Top to bottom crack extending beyond 3 4 of the length of the spring A crack that extends beyond 3 4 the length of the spring IS E SEENEN c Intersecting cracks of any length SUSPENSION CONNECTING ROD TRACKING COMPONENT ASSEMBLY OR SWAY BAR COMPONENTS 1 Any part of a suspension connecting rod or tracking component assembly including spring leaves used as a suspension connecting rod or any part used for attaching same to the vehicle frame or axle that is cracked loose broken or missing 393 207 a 2 Any part of a suspension connecting rod or tracking component assembly including spring leaves used as a suspension connecting rod equipped with rubber bushings 1s missing the bushing or the bushing is worn to the extent
5. ici dng Eelere Seege doses 31 F Overhead Amber Flashing Lights id 31 G Overhead Red Flashing Lia 31 H Back Up Waert dene ees Age 31 10 MISCELLANEOUS O A A aa Aa 31 Bo ACTOS CA iio 31 C Crossing Control Ar raso laci n 32 D DEMOS ee ee eege 32 E Door Entrance s ia 32 Fo A A 32 rs SEL EE EEN 32 e CRE E Le o EE E EAEE E E davdace eons Hee aad EE 32 Ly MITO EE 32 Re 32 Ki Seat DELVED torito ii bai is 33 E 33 MEP EE 33 N Stop Ima E WE 33 O Wheelchair Lift Equipped Buses WA eae 33 Pe ee 34 11 STEERING MECHANISM A Steering Wheel Lash Free Play E 34 B Steering OO e DS 35 C Front Axle Beam and all Steering Components Other than the Steering ON rises Eed ee oeae EEn 35 D Steering Gear Box including Rack and Drmion eee eeeeeereeereeee 35 E Pitman Gm usage a 36 F E 36 G Ball and Socket e 36 H Tie Rods and Drag EE 36 E E 36 Je Steering Syste e a a a oat tes 37 12 SUSPENSION A Axle Parts Members curia iii lia 37 Be SPORE ASS MD a A eae eine we 37 C teen 39 D Suspension Connecting Pod Tracking Component Assembly or Sway Bar Component corsa da ea 40 E Torque Radius or Tracking Component coooccnnncnonncconanoncnannninnncnnncnnso 41 13 TIRES A Any Tire on any Front Steering Axle eeeesecsreceseeeeeeeeaeeeaeens 42 B All Tires other than those found on the Front Steering Axile 43 14 WHEELS RIMS and HUBS e STE KGS EE 45 Bi Rit Cracks EE 45 co ER eet ee bid 45 D Bolt Stud H
6. in design type such as type 20 clamp versus type 20 rotochamber A bolt chamber with any chamber type is a mismatch b Mismatched brake adjuster length 393 47 c c c Defective Lining Conditions 11 111 1v Lining cracks or voids that exceed 1 16 inch 1 6 mm in width observable on the edge of the lining 393 47 a Portion of a lining segment missing such that a fastening device rivet or bolt is exposed when viewing the lining from the edge 393 47 a Crack exceeds 1 1 2 inch 38 1 mm in length 393 47 a Loose lining segment Approximately 1 16 inch 1 6 mm or more movement 393 47 a Complete lining segment missing 16 3 393 47 a vi The friction surface of the brake drum and the brake friction material are contaminated by oil or grease 393 47 a NOTE Refer to Wheels Rims and Hubs if wheel seal is actively leaking vii Lining with thickness less than 3 16 inch 4 8 mm for a shoe with a continuous strip of lining or 1 4 inch 6 4mm for a shoe with two lining blocks for drum brakes or worn into the wear indicator if lining is so marked 393 47 d 1 Air Disc Brakes Exposed Pushrods and Direct Coupled Air Chamber to Caliper Front Steering Axle a b c d e Mismatched air chamber sizes 393 47 b NOTE Mismatched air size excludes long stroke air chamber versus regular stroke air chamber A mismatch on an air disc brak
7. included in the system i e battery to electrical starter or alternator to battery 4 EMERGENCY EQUIPMENT A B FIRE EXTINGUISHER Any vehicle whose fire extinguisher is missing has an out of date certification not equipped with at least one type 2A 10 BC 5 pound pressurized dry chemical fire extinguisher not fully charged has no pressure gauge is not secured or is not readily accessible to the driver 393 95 FIRST AID and BODY FLUID KIT Any vehicle that does not have a first aid kit and body fluid kit that is readily accessible labeled removable and securely mounted If stored in a compartment the compartment must be labeled and not blocked EMERGENCY WARNING DEVICES Any vehicle not equipped with at least three reflectorized triangle road warning devices 5 EMERGENCY EXITS A Any emergency door window or roof hatch that fails to open freely or completely as defined in 571 217 Door prop rod device is missing or inoperative An emergency exit equipped with a padlock or similar locking 25 device excludes interlock systems Any bus that lacks the required number of emergency exits required in Nevada School Bus Standards at the time the bus was manufactured Any emergency exit not properly labeled and marked both inside and outside the vehicle Emergency exit warning device buzzer is not audible when raised to an open position Any emergency exit door that is not accessible by a 12 inc
8. limitation 395 8 e http www fmcsa dot gov regulations title49 section 395 8 PART II VEHICLE OUT OF SERVICE CRITERIA 1 BRAKE SYSTEMS A Defective Brakes The number of defective brakes is equal to or greater than 20 percent of the service brakes on the vehicle A defective brake includes any brake that meets one of the following criteria 396 3 a 1 NOTE Steering axle brakes under Front Steering Axle s Brakes are to be included in the 20 percent criterion 1 2 3 4 Absence of effective braking action upon application of the service brakes such as brake lining pad failing to move or contact braking surface upon application 393 48 a Audible Air Leak at air chamber Example ruptured diaphragm loose chamber clamp etc 396 3 a 1 NOTE Refer to Air Loss Rate Missing brake on any axle required to have brakes 393 42 a Brake Adjustment Limits Bring reservoir pressure between 90 100 psi 620 690 kPA turn engine off and then fully apply the brakes All brake measurement shall be made in 1 8 inch 3 2 mm increments a One brake at 1 4 inch 6 4 mm or more beyond the adjustment limit Example Type 30 clamp type air chamber pushrod measured at 2 1 4 inches 57 2 mm would be one defective brake 393 47 e b A brake found at 1 8 inch 3 2 mm beyond the brake adjustment limit shall be considered 0 5 1 2 a defective brake for determining the nu
9. motor vehicle Consumption 392 5 a 1 or Presence Influence 392 5 a 2 Be on duty or operating a motor vehicle while the driver possesses an intoxicating beverage regardless of its alcohol content Possession 392 5 a 3 Driver violating any roadside out of service order regarding intoxicating beverages 392 5 c 2 9 DRIVER S RECORD OF DUTY STATUS A Passenger Carrying Vehicles 1 10 Hour Rule Driving more than ten 10 hours following ten 10 consecutive hours off duty 395 3 s 3 2 15 Hour Rule Driving for any period after having been on duty fifteen 15 hours following ten 10 consecutive hours off duty 395 3 1 2 3 60 70 Rule Driving after being on duty for more than 60 hours in seven 7 consecutive days or 70 hours in eight 8 consecutive days 60 Hour Rule 392 5 b 1 or 70 Hour Rule 395 b Ou 4 No Record of Duty Status Log Book No record of duty status in possession when one is required 395 8 a 5 No Previous 7 Days Failing to have in possession a record of duty status for the previous 7 consecutive days 395 8 k 2 6 False Record of Duty Status log Book A required record of duty status that does not accurately reflect the driver s actual activities and duty status including time and location of each duty status change and the time spent in each duty status in an apparent attempt to conceal a violation of an hours of service
10. obscured 2 Any mirror system that fails to hold a set adjustment SEATS and BARRIERS 1 Any seat or barrier that is not securely attached to the 32 O vehicle 2 Any seat cushion that is not secured properly 3 Any seat or barrier material so defective that it compromises the integrity of occupant protection and compartmentalization SEAT DRIVER 1 Driver seat is not securely fastened to vehicle and or fails to maintain adjusted position 393 93 2 Any part of the driver s safety restraint assembly is missing not properly installed or defective as to prevent proper securement of driver 393 93 a b 571 209 SEAT BELTS All seat belts and restraining devices shall be free from defects STEP WELL Any part of the step well that is loose torn or damaged that would present a tripping hazard www ncstonline org STOP SIGNAL ARM S 1 2 Any vehicle whose stop signal arm s does not fully extend either automatically or manually when activated or does not have at least one operable warning lamp Any vehicle equipped with a LED light system where at least 25 of the LED lights are inoperable WHEELCHAIR LIFT EQUIPPED BUSES 1 2 3 Wheelchair lift does not function as designed or is inoperable Any hydraulic line leaking during operation Any wheelchair lift whose brake interlock system if equipped is non operational 33 4 Any wheelchair lift with a platform barrier roll s
11. purposes of the 20 rule DD 3 BRAKE CHAMBER DATA OUTSIDE BRAKE HALF DEFECT FULL DIAMETER ADJUSTMEN DEFECT T LIMIT LIMIT 8 1 8 206 mm 2 1 4 57 2 mm 2 3 8 60 3 mm 2 1 2 63 5 mm NOTE This chamber has three air lines and is found on motor coaches 12 WEDGE BRAKE DATA The combined movement of both brake shoe lining scribe marks shall not exceed 1 8 inch 3 2 mm 6 Drum Cam type and Wedge Air Brakes a Missing or broken brake shoe lining return spring shoe or chamber anchor pin spider cam roller camshaft pushrod yoke clevis pin clevis pin retainer e g cotter pin brake adjuster parking brake power spring or air chamber mounting bolt 393 48 a Loose air chamber spider or camshaft support bracket 393 48 a b Defective Lining Conditions 1 Lining cracks or voids exceed 1 16 inch 1 6 mm in width observable on the edge of the lining 393 47 a li Portion of a lining segment missing such that a fastening device rivet or bolt is exposed when viewing the lining from the edge 393 47 a iii Crack that exceeds 1 1 2 inch 38 1 mm in length 393 47 a iv Loose lining segment Approximately 1 16 inch 1 6 mm or more movement 393 47 a v Complete lining segment missing 393 47 a vi The friction surface of the brake drum and the brake friction material are contaminated by oil 13 or grease 393 47 a NOTE Also refer to Wheels Ri
12. securely attached to the vehicle 393 65 c NOTE Some fuel tanks use spring or rubber bushings to permit movement 3 Vehicle missing fuel cap 393 67 c 7 v GASEOUS FUELS Compressed Natural Gas CNG liquefied Petroleum Gas LPG and Liquefied Natural Gas LNG OCCUPATIONAL SAFETY NOTE Personnel must exercise extreme caution whenever checking a gaseous fuel system for leaks Any possibility of creating sparks static electricity friction etc 28 must be avoided as they could cause a fire or explosion OCCUPATIONAL SAFETY NOTE Vehicles with leaking gaseous fuel systems must be parked carefully Gases escaping from CNG and LNG systems will rise If the vehicle is parked inside a building or under a canopy roof or similar cover combustible gasses can collect beneath the ceiling Escaping LPG falls and can form a pool of combustible gas near the ground and displaces air including oxygen LPG and liquid LNG will flow into open drains Combustible gases can explode when ignited by an open flame or spark 1 CNG or LPG a Any fuel leakage from the CNG or LPG system detected by smell and verified by either a bubble test using non ammonia non corrosive soap solution or a flammable gas detection meter 396 3 a 1 b Any fuel leakage from the CNG or LPG system detected audibly and verified by either a bubble test using non ammonia non corrosive soap solution or flammable gas detection meter 396 3 a 1
13. the leaves in any spring assembly broken 393 207 c 2 The suspension connecting leaf in springs having such a 37 leaf has the same function as the suspension connecting rod components referenced in Suspension Connecting Rod Tracking Component Assembly or Sway Bar Components and should be treated as such a component for purposes of out of service 393 207 c 3 Any broken main leaf in a leaf spring 393 207 c NOTES 1 Any leaf of leaf spring assembly is a main leaf if 1t extends at both ends to or beyond a The load bearing surface of a spring hanger or equalizer b The spring end cap or insulator box mounted on the axle c A spring eye further Any leaf or a helper sping assembly is a helper main leaf if it extends at both ends to or beyond the load bearing surface of its contact pad hanger or equalizer Ze The radius rod leaf in springs having sucha leaf has the same function as the torque or radius components referenced in Suspensions Torque Radius Tracking or Sway Bar Components and should be treated as such a component for purposes of out of service SAFETY DEFECT BROKEN LEAF IN SPRING Broken Leaf 38 KEY SUSPENSION PARTS Hydraulic Shock Absorber Ki Leaf Spring Vehicle Frame Front Axle Hanger Frame Bearing Plates a F eS La QS Spring Shackle Torque Rod 4 Coil spring broken 393 207 d S Rubber spring missing 393 207 a 6
14. 393 47 d 1 END OF 20 BRAKE CRITERION SPRING BRAKE CHAMBERS Any non manufactured holes or cracks in the spring brake housing section of a parking brake 396 3 a 1 PARKING BRAKE No brakes on the vehicle are applied upon actuation of the parking brake control including driveline hand controlled parking brakes 393 41 18 BRAKE SMOKE FIRE Brake malfunction causing smoke or fire to emit from the wheel end 393 48 A Example Brake lining continuously in contact with brake drum or rotor NOTE This does not include overheating due to severe brake use NOTE Refer to Wheels Rims and Hubs as the cause may either be the brakes or a problem in the hub and bearing area BRAKE DRUMS OR ROTORS Disc 1 Any portion of the drum has any external crack or has any crack that opens upon brake application 393 47 a 2 Any rotor disc with a crack in length of more than 75 percent of the friction surface and passes completely through the rotor to the center vent from either side or completely through a solid rotor 393 47 a 3 A rotor surface is worn to or through center vents 393 47 g 4 Any portion of the drum or rotor discs missing or in danger of falling away 393 47 a NOTE Do not confuse short hairline heat check cracks with flexural cracks BRAKE HOSE TUBING 1 Any damage extending through the outer reinforcement ply 393 45 a NOTE Rubber impregnated fabric cove
15. AL CERTIFICATE 1 Operating a commercial vehicle without corrective lenses or hearing aid as indicated on the driver s medical certificate 391 11 b 4 2 Operating a CMV without a valid medical certificate in possession If driver fails to produce a medical certificate or has an expired medical certificate 391 41 a 3 A CDL driver whose CDLIS query indicates no medical certification has been filed and who presents a valid medical certificate during inspection shall not be placed out of service during the transition period 4 Operating a CMV with a fraudulent medical certificate 391 35 SICKNESS When so impaired that the driver should not continue the trip 392 3 FATIGUE When so fatigued that the driver of a commercial motor vehicle should not continue the trip 392 3 COMMUNICATION Driver is unable to communicate sufficiently to understand and respond to official inquiries and directions 391 11 b Ou DRUGS AND OTHER SUBSTANCES A Driver shall not be in possession as identified under 392 4 a B Driver shall not be under the influence with probable cause as identified under section 391 4 a INTOXICATING BEVERAGES A Any driver who is under the influence of intoxicating beverage consumes 7 C an intoxicating beverage regardless of its alcohol content or have any measured alcohol concentration or any detected presence of alcohol while on duty or operating or in physical control of a
16. Duty Stalin bt 8 II VEHICLE OUT OF SERVICE CRITERIA 1 BRAKE SYSTEMS A Defective EE 9 B Brake Adjustment Limit Reference Charts 10 C Front Steering Axle s Breed deed Reeder 16 D Spring Brake Chamber crasas crm ateos 18 E Parking Brake cisne trio tin diia Ed 18 Ee GE ege 19 G Brake Drums or Rotors disc ui di 19 H Brake Hose Tubing sic iaa 19 I Airt EE 20 J Low Pressure Warning EE eet 20 Kee E ARAE SEEE A E A 20 Ls Air AAA suseenate sea ees ta bewsatees Ged eveeens 20 E ee 21 N Hydraulic Br Ee 21 aaa A A learn Mas are 22 2 DRIVELINE DRIVESHAFT As YOK BINS EE 22 B Universal JO S nets feta eek thei ten a AS inthe alee 23 C Center Bernini 23 D Driveshatt TUDO nasrni nnn Dee a a era be e 24 3 ELECTRICAL CABLES AND SYSTEMS IN ENGINE AND BATTERY COMPARTMENTS Electrical Cables and Systems in Engine and Battery Compartment 24 4 EMERGENCY EQUIPMENT A PH ER UM cu hei tota ota 25 B First Aid and Body Fluid Kat 2op csycd ad 25 C Emergency Warning Device iii ENEE deeg 25 5 EMERGENCY EXITS soon 25 6 EXHAUS Tee EE 26 7 FRAME amp BODY As e Et He ss Ee heel EN 27 C Roof Body Structure uri ia Ee 28 8 FUEL SYSTEM A Liga e 28 IB Gaseous Fuel a A sii 28 9 LIGHTING DEVICES HEADLAMPS TAIL LAMPS STOP LAMPS TURN SIGNALS LAMPS AND BACK UP WARNING DEVICES Ay Headlamps ii dd cda 30 B Lamps EE 30 Co Stop LAMP EE 31 D Turn Signal Sia aeia E EA TETA EN E ens 31 E Four Way Hazard recht
17. Public Safety Nevada Highway patrol Commercial Enforcement to ensure the vehicles are mechanically safe and meet the minimum standards Nevada School Bus Standards established by the State Board The Nevada Highway Patrol has the authority to place any bus out of service for any violation listed in this criteria School buses that have an Out of Service condition while transporting students are allowed to return to the safest spot or destination whichever comes first as long as the violation is not a serious mechanical failure and does not immediately impact the safe transportation of the students This document was approved by the Nevada State Board of Education during the June 11 2015 State Board of Education meeting and is effective as of that date If you have questions regarding this document please contact Diana Hollander Program Officer Pupil Transportation Nevada Department of Education 9890 S Maryland Pkwy Suite 243 Las Vegas Nevada 89183 Phone number is 702 668 4319 and email address at dhollander doe nv gov TABLE OF CONTENTS I DRIVER OUT OF SERVICE CRITERIA occcoccioicoocioococoonononococoiononoonoo 6 I eerste Bee dee 6 2 Commercial Driver s License CD 6 3 Driver Medical Physical Requirements sia ts 7 Te EE 7 SPARD SEET 7 DS COMIC AO A A A A A A A wali 7 7 Drugs and Other Substances imitaciones lidia id aida oncda ss 7 8 re ds AA Ae curat sated dieses E a A EE 7 9 Driver Record of
18. STATE OF NEVADA Nevada Department of Education 2015 2016 SCHOOL BUS OUT OF SERVICE CRITERIA Dale Erquiaga Superintendent of Public Instruction Steve Canavero Ph D Deputy Superintendent for Student Achievement Mindy Martini Deputy Superintendent for Business amp Support Services Diana Hollander Program Officer Pupil Transportation NEVADA STATE BOARD OF EDUCATION Nevada State Board of Education 2015 2016 MEMBERS Elaine Wynn President Allison Serafin Vice President Dave Cook Alexis Gonzales Black Freeman Holbrook Tonia Holmes Sutton Teri Jamin Kevin Melcher Mark Newburn Lisa Noonan Jeff Zander Kaylyn Taylor Student Representative DEPARTMENT MISSON STATEMENT To improve student achievement and educator effectiveness by ensuring opportunities facilitating learning and promoting excellence DEPARTMENT VISION STATEMENT All Nevadan s ready for success in the 21 Century INTRODUCTION The purpose of the Nevada School Bus Out of Service Criteria is to identify defects on a school bus that would require the school bus be placed out of service NRS 385 075 requires the State Board establish policies to govern the administration of all functions of the State relating to supervision management and control of public schools not conferred by law on some other agency NRS 392 400 requires that vehicles used to transport students be in good condition and inspected semiannually by the Department of
19. ake pad shoe or lining 393 48 a Movement of the caliper within the anchor plate in the direction of wheel rotation exceeds 1 8 inches 3 2 mm 393 48 a CALIPER ASSEMBLY Wheel Rotation Movement c d e f Rotor or drum has evidence of metal to metal contact on the friction surface 393 47 d 2 Rotor has severe rusting on the rotor friction surface on either side light rusting on the friction surface is normal 393 48 a Friction surface of the brake rotor and the brake friction material are contaminated by oil grease or brake fluid 393 47 a NOTE Also refer to Wheels Rims and Hubs if wheel seal is actively leaking Lining or pad with a thickness of 1 16 inch 1 6 mm or less for disc or drum brakes 393 47 d 2 15 FRONT STEERING AXLE S BRAKES In addition to being included in the 20 percent criterion the following place a vehicle out of serve condition 1 2 Any inoperable brake such as any brake lining pad failing to move or contact braking surface upon application or missing brake on either wheel of any steering axle or any vehicle equipped or required to be equipped with steering axle brakes Missing 393 42 a or Inoperable 393 48 a Drum Cam Type and Wedge Air Brakes Front Steering Brakes a Mismatched air chamber sizes 393 47 b NOTE Mismatched air chamber versus regular stroke air chamber and excludes differences
20. cation 393 51 b 21 9 The hydraulic brake backup system is inoperative 396 3 a 1 O VACUUM BRAKES 1 2 Insufficient vacuum reserve to permit one full brake application after engine is shut off 393 50 b Vacuum hose s or line s restricted abraded chafed through outer cover to cord ply crimped cracked broken or has collapse of vacuum hose s when vacuum is applied 393 45 b 2 2 DRIVELINE DRIVESHAFT A YOKE ENDS INCLUDING SLIP YOKE YOKE SHAFT TUBE YOKE AND END FITTING YOKE 1 2 3 4 i 1 QU ia Slip Joint Any visible crack in a yoke end 396 a 1 Any yoke mounting hardware loose with hand pressure only broken or missing 396 3 a 1 Any horizontal or vertical movement of slip joint yoke shaft or greater than Y inch 12 8 mm with hand pressure only 396 3 a 1 Any loose broken or missing end fitting fastener 396 3 a 1 Yoke Nut End Fitting mounting hardware 22 UNIVERSAL JOINT 1 2 3 Any independent vertical movement between opposing yoke ends greater than 1 8 inch 3 2 mm with hand pressure only 396 3 a 1 Any missing universal joint bearing cap 396 3 a 1 Any missing broken or loose with hand pressure only universal joint bearing cap bolt 396 3 a 1 Bearing Assembly Cap Bearing Cap Bolt Retainer Bolt CENTER BEARING CARRIER BEARING 1 2 3 Any broken or l
21. e exists only when there is measurable difference in air chamber clamp sizes Mismatched brake adjuster length 393 47 c Missing brake pad 393 47 a Rotor has evidence of metal to metal contact on the rotor friction surface 393 48 a Rotor has severe rusting on the rotor friction surface on either side light rusting on the friction surface is normal 393 48 a The friction surface of the brake rotor and the brake friction material are contaminated by oil or grease 393 47 a NOTE Refer to Wheels Rims and Hubs if wheel seal is actively leaking 17 2 Brake pad thickness less than 1 16 inch 1 6 mm or to wear indicator if lining is so marked 393 47 d D 4 Hydraulic Brakes Front Steering Brakes a Missing lining or pad 393 47 a b Movement of the caliper within the anchor plate in the direction of wheel rotation exceeds 1 8 inches 3 2 mm 393 48 a c Rotor has evidence of metal to metal contact on the rotor friction surface 393 48 a d Rotor has severe rusting on the rotor friction surface on either side light rusting on the friction surface is normal 393 48 a e The friction surface of the brake drum or rotor and the brake friction material are contaminated by oil grease or brake fluid 393 47 a NOTE Refer to Wheels Rims and Hubs if wheel seal is actively leaking f Pad with a thickness 1 16 inch 1 6 mm or less for disc brakes
22. ehicle OVERHEAD AMBER FLASHING LIGHTS Overhead amber flashing lights do not fully operate when door is closed OVERHEAD RED FLASHING LIGHTS Overhead red flashing lights do not fully operate when vehicle is stopped and the loading unloading door is open BACK UP WARNING ALARM The back up warning alarm is not operating at a minimum of 87 dba 10 MISCELLANEOUS A AISLES Any aisle that is obstructed or has objects blocking the exits AEROSOL CANS Any aerosol cans that are stored in the passenger compartment 31 CROSSING CONTROL ARM Any vehicle not equipped with a crossing control arm or any vehicle whose crossing control arm is non operational The installation of such a mechanical device is not required for a school bus which is used solely to transport pupils with special needs who are individually loaded and unloaded in a manner which does not require them to walk in front of the bus NRS 392 410 DEFROSTERS Any vehicle whose defrosters are not operational DOOR ENTRANCE Door does not properly open and close without any obstruction or movement and maintain an open or closed position FLOORS Any floor not maintained to prevent slipping or tripping HANDRAILS Any vehicle whose handrails have not been modified to ensure that hood cords back pack straps or belts will not become entangled HORN Any vehicle whose horn does not work MIRRORS 1 Any mirror required that is missing damaged clouded or
23. entiate between excessive lash and power systems designed to avoid providing steering assistance when the steering wheel is turned while the vehicle is motionless not moving forward or backward B STEERING COLUMN 1 Any absence or looseness of U bolt s or positioning part s 393 209 c 2 Obviously repair welded universal joint s 393 209 d 3 Steering wheel not properly secured 393 209 a 4 Telescopic steering column does not lock into position 396 3 a 1 5 Tilt steering column does not lock in at least one position 396 3 a 1 C FRONT AXLE BEAM AND ALL STEERING COMPONENTS OTHER THAN STEERING COLUMN Including hub 1 Any crack s 396 3 a 1 2 Any obvious welded repair s 396 3 a 1 D STEERING GEAR BOX Including Rack and Pinion 1 Any mounting bolt s loose or missing 393 209 d 2 Any crack s in gear box or mounting brackets 393 209 d 3 Any obvious welded repairs 396 3 a 1 4 Any looseness of the yoke coupling to the steering gear input shaft 393 209 d 35 PITMAN ARM 1 Any looseness of the pitman arm on the steering gear output shaft 393 209 d 2 Any obvious welded repairs s 396 3 a 1 POWER STEERING 1 Auxiliary power assist cylinder loose 393 209 e 2 Evidence of power steering fluid leaking steadily showing little variation or fluctuation from any component in the system This includes any component that shares the res
24. ervoir to the power steering system BALL and SOCKET JOINTS 1 Any movement under steering load of a stud nut 393 209 d 2 Any motion other than rotational between any linkage member and its attachment point of more than 1 8 inch 3 2 mm measured with hand pressure only 393 209 d 3 Any obvious welded repair s 393 209 d TIE RODS and DRAG LINKS 1 Loose clamp s or clamp bolt s on tie rods or drag links 396 3 a 1 2 Any looseness in any threaded joint 396 3 a 1 NUTS Loose or missing on tie rods pitman arm drag link steering arm tie rod arm or cotter pin 396 3 a 1 36 J STEERING SYSTEM Any modification or other condition that interferes with the free movement of any steering component 393 209 d STEERING SYSTEM Steering Wheel Tie Rod 4 AO EGP Be 5 Hydraulic Fluid ee ES Gear Box JE Pitman Arm Spindle Steering Knuckle Drag Link 12 SUSPENSION A AXLE PARTS MEMBERS 1 Any U bolt s or other spring to axel clamp bolt s cracked broken loose or missing 393 207 a 2 Any axle axle housing spring hanger s or other axle positioning part s cracked broken loose or missing resulting in shifting of an axel from its normal position 393 207 a NOTE After a turn lateral axle displacement is normal with some suspensions including composite springs mounted on steering axles B SPRING ASSEMBLY 1 One fourth or more of
25. h minimum aisle or obstructed by a barrier seat wheelchair or tie down unless a flip seat is installed and occupied A flip seat in the unoccupied up position shall not obstruct the 12 inch minimum aisle to any side emergency door and must be fully operational and flip up with slight hand pressure Any emergency exit equipped with a starter interlock that is non operational EXHAUST SYSTEM A Any exhaust system leaking or discharging directly below the driver or passenger compartment NCST page 78 www ncstonline org NOTE Engine must be running to verify exhaust leaks NOTE Does not apply to proper venting for emission systems as designed by the manufacturer No part of the exhaust system shall be located where it is likely to result in burning charring or damaging the electrical wiring the fuel supply or any combustible part of the motor vehicle FRAME amp BODY A FRAME MEMBERS 1 Any cracked loose sagging or broken frame siderail permitting shifting of the body onto moving parts or other 26 2 3 4 5 FLANGE conditions indicating an imminent collapse of the frame 393 201 a Any cracked loose or broken frame member adversely affecting support of functional components such as steering gear engine transmission body parts and suspension 393 201 a One and one half inches 38 mm or longer crack in frame siderail web which is directed toward bottom flange 393 201 a
26. is present 46 rim NOTE Grease oil on the brake lining edge back of shoe or drum edge and oil stain with no evidence of fresh oil leakage are not conditions for out of service 4 Lubricant is leaking from the hub and is present on the wheel surface caused by a loose hub cap or hub cap bolts or hub cap damage accompanied by evidence that further leakage will occur 396 5 b 5 No visible or measurable amount of lubricant showing in hub 396 5 a 15 WINDSHIELD WIPERS Any school bus that has an inoperable wiper or missing or damaged parts that renders it ineffective 393 78 b 47
27. isually observable bump bulge or knot apparently related to 42 6 7 8 9 10 11 tread or sidewall separation 393 75 a 2 EXCEPTION A bulge due to a repair of up to 3 8 inch 9 5 mm in height is allowed This bulge may sometimes be identified by a blue triangular label in the immediate vicinity Presence of rubber coated cord or cured rubber plug in the sidewall 396 3 a 1 Tire has noticeable e g can be heard or felt leak or has 50 percent or less of the maximum inflation marked on the tire sidewall 393 75 a 3 NOTE Measure tire air pressure only if there is evidence the tire is under inflated So mounted or inflated that it comes in contact with any part of the vehicle 396 3 a 1 NOTE An out of service condition exists only if the tire can be made to contact another component at the time of inspection Weight carried exceeds tire load limit This includes overloaded tire resulting from low air pressure Load Limit 393 75 f or Inflation Pressure 393 75 h Any vehicle that bias and radial tires have been combined Any vehicle with re grooved recapped or retread tires 393 75 d ALL TIRES OTHER THAN THOSE FOUND ON THE FRONT STEERING AXLE 1 2 Tire has noticeable e g can be heard or felt leak or has fifty 50 percent or less of the maximum inflation pressure marked on the tire sidewall 393 75 a 3 NOTE Measure tire air pressure onl
28. ly exceeds 2 square inches 12 9 sq cm or damaged plies are evident in the sidewall up to 2 square inches 12 9 sq cm 393 75 a 1 Radial Ply Tire When two or more plies are exposed in the tread area and the exposed area of the top ply exceeds 2 square inches 12 9 sq cm or damaged cords are evident in the sidewall up to 2 square inches 12 9sq cm 393 75 a 1 Presence of rubber coated cord or cured rubber plug in the sidewall 396 3 a 1 44 14 11 So worn that less that 2 32 inch 8 mm tread remains when measured in any two adjacent major tread grooves typically any groove containing a tread wear indicator at 3 separate locations around the circumference of the tire at least 8 inches apart 393 75 c NOTE Measurements should not be made on stone ejectors or tread wear indicators WHEELS RIMS and HUBS A LOCK or SIDE RING Bent broken cracked improperly seated sprung or mismatched ring s 393 205 a RIM CRACKS Any circumferential crack 393 205 a DISC WHEEL CRACKS 1 Any crack exceeding 3 inches 76 2 mm in length 393 205 a 2 A crack extending between any two holes hand holes stud holes and center holes 393 205 a 3 Two or more cracks anyplace on the wheel 393 205 a BOLT STUD HOLES Disc Wheels Any visible elongated bolt stud hole 393 205 b SPOKE WHEEL CRACKS 1 Two or more cracks more than 1 inch 25 4 mm long across spoke or hub section
29. mber of defective brakes per the 20 percent defective brake criterion Example Type 30 clamp type brake chamber pushrods measure Two 2 at 2 1 8 inches 54 0 mm equal to 1 defective brake 393 47 e NOTE When the vehicle is declared out of service for 20 percent brake violations all brakes found beyond the brake adjustment limit must be repaired NOTE When calculating determining the number of defective brakes round all fractions down to the next whole number e g 4 5 brake violations 4 defective brakes S Any wedge brake where the combination brake lining movement of both top and bottom shoes exceeds 1 8 inch 3 2 mm 393 47 f B BRAKE ADJUSTMENT LIMIT REFERENCE CHARTS CLAMP TYPE BRAKE CHAMBER DATA OUTSIDE BRAKE HALF FULL DEFECT DIAMETER ADJUSTMENT DEFECT LIMIT LIMIT LIMIT 4 1 2 114 mm 1 1 4 31 8 mm 1 3 8 34 9 mm 1 1 2 38 1 mm 5 1 4 133 mm 1 3 8 34 9 mm 1 1 2 38 1 mm 1 5 8 41 3 mm 36 9 229 mm 1 3 8 60 3 mm NOTE Service chambers with housings that are permanently crimped and sealed together are considered clamp type chambers even though they do not have a separate clamp band NOTE A brake found at the adjustment limit is not a defect for the purposes of the 20 rule 10 LONG STROKE CLAMP TYPE BRAKE CHAMBER DATA TYPE OUTSID BRAKE HALF FULL DIAMETER ADJUSTMENT DEFECT DEFECT LIMIT LIMIT LIMIT ir EE EE EE 20 2 5 6 25 32 172 mm 2 50 8 mm 2 1 8 54 0
30. mm 2 1 4 57 2 mm rated 20 3 rated 6 25 32 172 mm 2 1 2 63 5 mm 2 5 8 66 7 mm 2 3 4 69 9 mm stroke 24 2 5 77 32 184 mm 2 50 8 mm 2 1 8 54 0 mm 2 1 4 57 2 mm rated 24 3 rated 77 32 184 mm 2 1 2 63 5 mm 2 5 8 66 7 mm 2 3 4 69 9 mm stroke 8 3 32 206 mm 2 1 2 63 5 mm 2 5 8 66 7mm 2 3 4 69 9 mm NOTE Rated stroke is indicated on a tag and is only used to identify chamber size NOTE Service chambers with housings that are permanently crimped and sealed together are considered clamp type chambers even though they do not have a separate clamp band NOTE A brake found at the adjustment limit is not a defect for the purposes of the 20 rule BOLT TYPE BRAKE CHAMBER DATA OUTSIDE BRAKE FULL HALF DEFECT DIAMETER ADJUSTMENT LIMIT e DEFECT LIMIT LIMIT A 6 15 16 176 mm 1 3 8 34 9 mm 1 1 2 38 1 mm 1 5 8 41 3 mm 9 3 16 234 mm 1 3 4 44 5mm 1 7 8 47 6 mm C 8 1 16 205 mm 1 3 4 44 5mm 17 8 47 6 mm 11 5 1 4 133 mm 1 1 4 31 8 mm 1 3 8 34 9 mm 1 1 2 38 1 mm E 6 3 16 157 mm 1 3 8 34 9 mm 11 2 38 1 mm 1 5 8 41 3 mm F 11 279 mm 2 1 4 57 2 mm 2 3 8 60 3 mm 2 1 2 63 5 mm le EE NOTE A brake found at the adjustment limit is not a defect for the purposes of the 20 rule ROTOCHAMBER DATA OUTSIDE BRAKE HALF FULL DIAMETER ADJUSTMENT DEFECT Se LIMIT LIMIT NOTE A brake found at the adjustment limit is not a defect for the
31. ms and Hubs if wheel is actively leaking vii Lining thickness less than 1 4 inch 6 4 mm or worn into the wear indicator if lining is so marked measured at the shoe center 393 47 d 2 Out of Service Out of Service Cracks or voids that exceed 1 16 in width Portion of lining missing that exposes a Cracks that exceed 1 1 2 in length fastening device 7 Air Disc Brakes Exposed Pushrods and Direct Coupled Air Chamber to Caliper a b c d e Missing or broken caliper brake pad pad retaining component pushrod yoke clevis pin retainer e g cotter pin brake adjuster parking brake power spring chamber return spring or air chamber mounting bolt 393 48 a Loose or missing brake chamber or caliper mounting bolt 393 48 a Rotor has evidence of metal to metal contact on the friction surface 393 47 d 2 Rotor has severe rusting on the rotor friction surface on either side light rusting on the friction surface is normal 393 48 a The friction surface of the brake rotor and the brake friction material are contaminated by oil or grease 393 47 a 14 8 NOTE Also refer to Wheels Rims and Hubs if wheel seal is actively leaking Brake pad thickness less than 1 16 inch 1 6 mm or to wear indicator if lining is so marked 393 47 d 2 Hydraulic and Electric Brakes a b Missing or broken caliper pad retaining component br
32. nal attachment point s allowing movement of more than 1 inch 25 4 mm in any direction 396 3 a 1 20 AIR COMPRESSOR Normally to be inspected when readily visible or when conditions indicate compressor problems 1 Loose compressor mounting bolts 396 3 a 1 2 Cracked broken or loose pulley 396 3 a 1 3 Cracked or broken mounting brackets braces or adapters 396 3 a 1 HYDRAULIC BRAKES 1 The fluid level in any master cylinder reservoir is less than 1 4 full or below minimum marking 396 3 a 1 NOTE Normally to be inspected when readily visible or problems are apparent 2 Hydraulic or vacuum lines hoses or connections are restricted crimped broken or damaged through the outer reinforcement ply Restricted Crimped Broker 393 45 a or Damaged 393 45 b 2 NOTE Rubber impregnated fabric cover is not a reinforcement ply 3 Any observable seepage bulge or swelling on a brake hose under application pressure 393 45 a 4 Any observable leaking hydraulic fluid in the brake system upon full application 393 45 a 5 No pedal reserve with engine running upon full brake application 393 40 b 6 Brake power assist unit is inoperative 396 3 a 1 7 Hydraulic power brake HPB unit is inoperative 396 3 a 1 8 Brake failure warning system is missing inoperative disconnected defective or activated while the engine is running with or without brake appli
33. oles Disc Wheclst nooo 45 Es Spoke Ween deed 45 F Tubeless Demountable Adapter Cracks 45 E Wee Fastenets ounie A ee 46 Held e oa tii cis 46 RR rt O O 46 15 WINDSHIELD WIPERS 47 PART I DRIVER OUT OF SERVICE CRITERIA 1 DRIVER S AGE Driver is not at least 21 years of age 391 11 b 1 2 COMMERCIAL DRIVER S LICENSE CDL A License 1 Does not possess a valid CDL issued by his her state or jurisdiction of domicile 383 23 a 2 NOTE Does not possess a valid CDL includes but is not limited to improper class expired cancelled revoked disqualified suspended or withdrawn 2 Operating a non CDL required commercial motor vehicle with driving privileges revoked suspended cancelled or otherwise disqualified 391 15 a 3 Operating a CDL required commercial motor vehicle with driving privileges revoked suspended cancelled or otherwise disqualified Learner s Permit 1 Is not accompanied by the holder of a valid CDL 383 23 c 1 2 Does not hold a valid automobile drivers license or have a valid operator s status allowed by licensing jurisdiction 383 23 c 2 Endorsements and Restrictions Operating a commercial vehicle without the proper endorsements or in violation of restrictions 383 23 a 2 Classification Does not possess the proper class of license for the vehicle being operated 383 91 a 3 DRIVER MEDICAL PHYSICAL REQUIREMENTS A MEDIC
34. oose center bearing bracket bracket bolts or mounting hardware 396 3 a 1 Any center bearing bracket crack equaling 50 percent or more of the original bracket width 396 3 a 1 More than Y inch 12 8 mm vertical movement with hand pressure only of the shaft in the center bearing carrier 396 3 a 1 23 D DRIVESHAFT TUBE 1 Any original metal crack in the shaft tube greater than 1 4 inch 6 4 mm in length 396 3 a 1 2 Obvious cracked weld at shaft tube end 396 3 a 1 3 Any shaft tube with obvious twist 396 3 a 1 Center PA Differential Sy A Fe Begring sei rad Output Yoke A Shaft Yoke e Joint Transmission Shaft End Fitting Yoke 3 ELECTRICAL CABLES AND SYSTEM IN ENGINE AND BATTERY COMPARTMENTS A Electrical cable insulation chafed frayed damaged or burnt causing bare cable to be exposed 393 28 B Missing or damaged protective grommets insulating electrical cables through metal compartments panels 393 28 C Broken or unsecured mounting of electrical components 396 3 a 0 24 Electrical cables unsupported hanging or missing clamps that may cause chafing or a frayed condition 393 28 Any visual leaking of lubricant Oe engine supplied oil pressure from electrical component such as alternator auxiliary heater etc 396 5 b NOTE A cable is the power conveying part of a high wattage voltage electrical system It usually has no circuit overload protection
35. r is not a reinforcement ply NOTE Thermoplastic nylon tube may have braid reinforcement or color difference between cover and inner tube Exposure of second color is out of service condition 19 2 Bulge swelling when air pressure is applied 393 45 a 3 Audible leak at other than a proper connection 393 45 a 4 Improperly joined such as a splice made by sliding the hose ends over a piece of tubing and clamping the hose to the tube 393 45 a S Damaged by heat broken or crimped in such a manner as to restrict air flow 393 45 a AIR PRESSURE GAUGE Inoperative or defective primary or secondary air pressure gauge 393 5 1 c LOW AIR PRESSURE WARNING DEVICE Low air pressure warning device missing inoperative or does not operate continuously if either the primary or secondary reservoir is at 55 psi 379 kPa and below or 1 2 of the governor cut out pressure whichever is less 393 51 c NOTE If either an audible or visual warning device is working as required vehicle should not be placed out of service AIR LOSS RATE If an air leak is discovered and either the primary or secondary reservoir pressure is not maintained when 396 3 a 1 1 Governor is cut in 2 Reservoir pressure is between 80 90 psi 551 620 kPa 3 Engine is at idle and 4 Service brakes are either fully applied or released AIR RESERVOIR TANK An air reservoir tank separated at either end from its origi
36. that the component can be moved by hand along the axis of the component 393 207 a NOTE A shock absorber is not a suspension connecting rod A defective shock absorber will not result in an OOS condition 40 Suspension Connecting Rod Trailing Arm Suspension Tracking Component Assembly TORQUE RADIUS OR TRACKING COMPONENTS Any part of a torque radius or tracking component assembly or any part used for attaching same to the vehicle frame or axle that is cracked loose broken or missing including spring leaves used as a radius or torque rod missing bushings but not loose bushings in torque or track rods 393 207 a 41 13 TIRES A ANY TIRES ON ANY FRONT STEERING AXLE 1 2 3 4 5 With less than 4 32 inch tread when measured in any two adjacent major tread grooves typically any groove containing a tread wear indicator at any location on the tire 393 75 b NOTE Measurements should not be made on stone ejectors or tread wear indicators STONE EJECTORS STONE EJECTORS INDICATORS WEAR INDICATORS When any part of the belt material breaker strip or casing ply is showing in the tread 393 75 a 1 When sidewall is cut worn or damaged to the extent that the steel or fabric ply cord is exposed 393 75 a 1 Labeled Not for Highway Use or carrying other markings that indicate excluded use on steering axles 396 3 a 1 V
37. top that is non operational 5 Any wheelchair restraint system that is missing incomplete improperly installed or damaged 6 Any wheelchair restraint system that is not secured to the bus P WINDOWS 1 Any glass that that is broken through 2 Driver s side window s that have chips clouding or cracks that obscure the driver s vision 11 STEERING MECHANISM A STEERING WHEEL LASH FREE PLAY See chart below When any of these values inch movement or degrees are met or exceeded vehicle shall be placed out of service 393 209 b For power steering systems the engine must be running Steering Wheel Manual System Movement Power System Movement Diameter 30 45 16 40 6 cm 4 1 2 11 4 cm or more 6 3 4 17 1 cm or more 18 45 7 cm 4 3 4 12 cm or more 7 1 8 18 1 cm or more 19 48 2 cm 5 1 4 13 3 cm or more 7 1 2 19 cm or more 21 53 3 cm 5 1 2 13 9 cm or more 8 1 4 20 9 cm or more 22 55 8 cm 5 3 4 14 6 cm or more 8 5 8 21 9 cm or more For power systems if steering wheel movement exceeds 45 degrees before steering axle tires move proceed as follows Rock steering wheel left to right 34 20 50 8 cm 5 1 2 13 9 cm or more 7 7 8 20 cm or more between points of power steering valve resistance If that motion exceeds 30 degrees or the inch movement values shown for manual steering vehicle shall be placed out of service This test is to differ
38. vapor coming from any component of the fuel system 396 3 a 1 NOTE It is normal particularly in humid conditions for water vapor to collect around many portions of a LNG fuel system b Any leak detected by a methane detection meter 396 3 a 1 c Dripping liquid that boils or vaporizes in the air 396 3 a 1 LIGHTING DEVICES HEADLAMPS TAIL LAMPS STOP LAMPS TURN SIGNALS AND LAMPS AND BACK UP WARNING ALARM A HEADLAMPS The bus does not have at least one head lamp operating on low beam Inoperative 393 9 a Obscured 393 9 b Missing 393 11 a 1 or Driveaway 393 17 a 1 LAMPS ON REAR The bus does not have at least one steady burning tail lamp on the rear of the vehicle visible from 500 feet 152 4m Inoperative 30 393 9 a Obscured 393 9 b Missing 393 11 a 1 or Driveaway 393 17 b 2 STOP LAMP Does not have at least one operative stop lamp on the rear of a vehicle visible from 500 feet 152 4m Inoperative 393 9 a Obscured 393 9 b Missing 393 11 a 1 or Driveaway 393 17 b 2 TURN SIGNALS Does not have operative turn signals visible on each side of the rear of the vehicle Inoperative 393 9 a Obscured 393 9 b Missing 393 11 a 1 or Driveaway 393 17 b 2 FOUR WAY HAZARD LIGHTS Four way hazard lights do not fully operate in the front and rear if the v
39. y if there is evidence the tire is under inflated Any tire with visually observable bump or knot apparently related to tread or sidewall separation 393 75 a 2 43 3 4 5 6 7 8 9 10 EXCEPTION A bulge due to a repair of up to 3 8 inch 9 5 mm in height is allowed The bulge may sometimes be identified by a blue triangular label in the immediate vicinity So mounted or inflated that it comes in contact with any part of the vehicle 396 3 a 1 NOTE This includes any tire contacting its mate in a dual set Weight carried exceeds tire load limit This includes overloaded tire resulting from low air pressure Load Limit 393 75 f 393 75 g 1 8393 75 2IQ or Inflation Pressure 393 75 h Seventy five 73 percent or more of the tread width loose or missing in excess of 12 inches 30 4 cm in circumference 393 75 a 2 Bias Ply Tire When more than one ply is exposed in the sidewall and the area exceeds 2 square inches 12 9 sq cm 393 75 a 1 Radial Ply Tire When more than one ply is exposed in the sidewall and the area exceeds 2 square inches 12 9 sq cm 393 75 a 1 NOTE The following conditions apply to all tires however when these conditions are found on a dual tire set both tires must meet one or more of the conditions listed in item 10 Bias Ply Tire When more than one ply is exposed in the tread area and the exposed area of the top p
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