Operating Instructions
Contents
1. MPC 25 MCCAULEY Governor Operator Owner Manual Warranty Registration Card Governor Model Governor S N Date of First Installation on Aircraft Owner s Name Company r m __ __ __________ rung Address _ ___________ __o_ __ _ TT __ 1m1__ n1n1 City State Postal Code lt lt lt Y_e _____ _ _ _ _ _1 _ Country _ cc pp so OO OO OO ON ON Telephone Telefax er euh ns ne __ us McCauley Propeller Systems Product Support Dept 767 P O Box 7704 Wichita KS 67277 7704 USA McCauley Propeller Systems MPC 25 McCauley Propeller Systems Product Support Dept 767 P O Box 7704 Wichita KS 67277 7704 USA Telephone 316 831 4021 Telefax 316 831 3858 Contact McCauley Product Support Department for the nearest McCauley Authorized Overhaul Facility McCauley Propeller Systems MPC 25 The following warranty is expressly for new governors or governors remanufactured by McCauley Propeller Systems Govemors overhauled or reconditioned by facilities other than McCauley will have a warranty as specified2. toes of flyweight Work must be accomplished only by an FAA approved propeller repair station or governor overhaul facility in accordance with the governor service manual Test run the governor on a governor test bench to verify correct operation and check for leakage This must be accomplished only by an FAA approved propeller repair station or governor overhaul facility in accordance with the governor service manual Governor Installation Record Date Notes Authorized Date Installed Signature Removed 21 Date Installed Governor Installation Record Notes Authorized Signature Date Removed Governor Installation Record Date Notes Authorized Date Installed Signature Removed Governor Installation Record Authorized Date Date Notes Signature Aemoved Installed 24 Governor Installation Record Date Notes Authorized Date Installed Signature Removed Date installed Governor Installation Record Notes Authorized Signature Date Removed Governor Installation Record Date Notes Authorized Date Installed Signature Removed Governor Installation Record Date Notes Authorized Date Installed Signature Removed Date Installed Governor Installation Record Notes Authorized Signature Date Removed Governor Installation Record Date Notes Authorized Date Installed Signature Removed MPC 25 MARCH 2004
3. by the facility performing the work McCauley Propeller Systems a division of The Cessna Aircraft Company Wichita Kansas U S A McCAU LEY expressly warrants new and remanufactured products produced and sold by McCauley to be free from defects in material and workmanship under normal use and service for a period of thirty six 36 months after delivery to the original retail purchaser or until the expiration of the maximum hours of use or calendar limits for overhaul published by McCauley for the subject product whichever occurs first McCauley s obligation under this limited warranty is limited to repairing or replacing at its option any propeller propeller parts governor or governor parts determined by McCauley to have been defective and which is properly retumed by the owner with a written statement describing the alleged defect to any McCauley Authorized Service Center authorized to service the individual McCauley product The repair or replacement of defective parts will be made without charge to the owner for parts or labor for removal and installation except export import duties and or sales or use taxes if any which are solely the owners responsibility A part replaced pursuant to this limited warranty will be warranted by McCauley under the same terms as the original McCauley Propeller Systems MPC 25 part for the remainder of the applicable warranty period of the original part This limited warranty is not in
4. e or use of the warranted products and McCauley neither assumes nor authorizes anyone to assume for it any other obligation or liability in connection with such warranted products The United Nations Convention on Contracts for the International Sale of Goods 1980 and any successor thereto is expressiy excluded from this warranty 8 McCauley Propeller Systems MPC 25 Details The information in this guide is intended for general reference use only The procedures explained in this guide may not be applicable for your installation If any question exists regarding these procedures contact McCauley Product Support at 316 831 4021 Always consult the aircraft Type Certificate Data Sheet or owner operator s handbook before modification to governor or installation McCauley Propeller Systems MPC 25 General Facts About McCauley Governors Engine redline RPM may or may not be reached during a full power static run up Ina Constant Speed Propeller the governor is not controlling the propeller at this time the propeller is against its low pitch stop Attempting to increase propeller static run up RPM by adjusting the governor high RPM screw will have no effect and will probably result in a propeller overspeed during the takeoff roll On an aircraft several considerations determine both the low and high blade angle settings Normally 25 to 100 RPM below rated takeoff RPM is desirable and acceptable during a static run
5. ed by entities other than McCauley and or McCauley Authorized Service Centers McCauley Propeller Systems MPC 25 The McCauley limited warranty is void on any new or remanufactured product installed without McCauley s prior written approval on a non type certificated engine or on any engine which has received an overhaul or modification which is not approved by the engine manufac turer and that results in a change to the vibratory environment of the engine such as but not limited to an alteration of horsepower operating RPM crankshaft damper configuration com pression ratio magneto timing camshaft design or any other overhaul or modification not expressiy approved by the original engine manufacturer To the extent allowed by applicable law THIS WARRANTY IS EXPRESSLY IN LIEU OF ANY OTHER WARRANTIES EXPRESSED OR IMPLIED IN FACT OR BY LAW INCLUDING ANY IMPLIED WARRANTY OF MERCHANTABILITY OR FITNESS FORA PARTICULAR PURPOSE THE REMEDIES OF REPAIR OR REPLACEMENT SET FORTH HEREIN ARE THE ONLY REM EDIES UNDER THIS WARRANTY McCAULEY DISCLAIMS ANY OBLIGATION OR LIABILITY WHETHER IN CONTRACT OR IN TORT INCLUDING LOSS OF USE OF THE PRODUCT WARRANTED LOSS OF TIME INCONVENIENCE LOSS OF PROFITS COMMERCIAL LOSS OR ANY OTHER DIRECT CONSEQUENTIAL SPECIAL OR INCIDENTAL DAMAGES THIS WARRANTY IS IN LIEU OF ANY OBLIGATION OR LIABILITY ON THE PART OF McCAULEY TO ANYONE OF ANY NATURE WHATSOEVER by reason of the manufacture sale leas
6. epending on barometer reading and distance from sea level Record propeller RPM If local wind conditions are over 5 knots repeat check with aircraft pointed in opposite direction and average the two numbers As a general rule propeller RPM should be at redline or 100 RPM below redline limit during the above check 13 McCauley Propeller Systems MPC 25 Calibration Procedures Following Installation of McCauley Governors cont d Perform Flight Test During takeoff acceleration record maximum propeller RPM When sufficient altitude is reached level out aircraft leaving propeller control in full RPM position Maintain this setting for three 3 to five 5 minutes while monitoring propeller RPM Do not allow RPM to exceed redline by moving the propeller control aft Following this check two conditions may exist which require adjustment A If propeller RPM is exceeding redline limit reduce it to redline using propeller control Leaving propeller at this redline RPM setting land aircraft and shutdown Remove cowling and note position of control arm on governor Adjust governor high RPM screw clockwise so it just touches stop on governor control arm this will ensure that the correct arm position for governor redline RPM setting cannot be exceeded If propeller RPM is below redline limit with max RPM setting on the propeller cockpit control note RPM and land Remove engine cowling and adjust the governor high RPM screw coun
7. iveness and by the time the propeller responds to earlier governor inputs they have changed resulting in propeller wandering Corrective Action Perform a transfer bearing leakage test per engine manufacturer s instructions If test indicates a high rate of leakage even though it may still be on the high side of acceptable tolerance this may be your cause Install the suspect governor on a known good aircraft If the problem disappears engine work may be indicated Possible Cause Malfunctioning Magnetos Corrective Action Follow troubleshooting procedures in manufacturers manual 16 McCauley Propeller Systems MPC 25 Governor Troubleshooting cont d Possible Cause Dirty Engine Oil contaminants in dirty engine oil can cause blockage of close tolerance passages in govemor leading to erratic operation Corrective Action Timely engine oil changes as often as every 30 hours should eliminate this problem 2 Symptom Propeller RPM changing and holding new setting Possible Cause Excessive Play in Aircraft Propeller Control Linkage excessive play in the linkage between the governor and the cockpit control often leads to erratic operation Solution Trace linkage locate unsecured sections and tighten as needed Please note that although linkage may appear to allow full govemor control while the engine is off it may not in the air Engine vibration and stretch of the mount du
8. overnor models Refer to McCauley Service Bulletin 137 X Long Term Storage of Governors The following is applicable to new and over hauled governors prior to entering service engine installation Storage time is determined from date of manufacture or overhaul A Storage must be in a clean and dry environment preferably in the original Shipping carton and above ground level to minimize exposure to dirt and moisture B If storage period exceeds two 2 years before entering service perform the following inspection 1 Inspect externally for damage and corrosion 2 Test run the governor on a governor test bench to verify correct operation and check for leakage This must be accomplished only by an FAA approved propeller repair station or governor overhaul facility in accordance with the governor service manual 19 McCauley Propeller Systems MPC 25 Governor Overhaul Requirements and Storage Requirements cont d If storage period exceeds five 5 years before entering service perform the following inspection and parts replacement 1 2 3 Disassemble as necessary to replace all rubber seals and gaskets Total disassembly such as disassembling the fiyweight assembly is not required unless evidence of corrosion warrants further disassembly Inspect parts for damage and corrosion repair replace parts as necessary Critical inspection areas are 1 D of drive gear O D of the pilot spool and
9. que screw to 18 24 Ibf in 2 0 2 7 Nm 11 McCauley Propeller Systems MPC 25 Governor Installation Instructions cont d 7 Reconnect push puli control to outermost hole on governor control lever and adjust linkage per aircraft service information 8 Flight check aircraft for proper RPM setting Record amount of change required at different flight conditions Tests should be done in smooth air 9 If adjustment is required remove cowling cut lockwire loosen jam nut and tum max RPM screw clockwise or counterclockwise NOTE One full tum clockwise will reduce RPM by approximately 25 RPM One full turn counterclockwise will increase RPM by approximately 25 RPM 10 Also check for oil leaks none permitted 12 McCauley Propeller Systems MPC 25 Calibration Procedures Following Installation of McCauley Governors Run up aircraft after engine oil temperature is in operating range cycle governor propeller at least 5 times to remove air oil passages in governor and propeller For feathering governors Perform a propeller feathering check as outlined in the aircraft flight manual or pilot s operating handbook before the first flight of aircraft following installation Perform Static Run up Lock aircraft brakes Place cockpit propeller RPM lever in high RPM takeoff position Advance throttle slowly to maximum permitted engine manifold pressure limits but do not exceed limits Manifold will vary d
10. ring operation can often aggravate the condition Therefore it is important the entire length of linkage be properly secured even if the ends alone are tight 17 McCauley Propeller Systems MPC 25 Governor Troubleshooting cont d 3 Symptom Propeller resistant to pitch movement Possible Cause NOTE This is rarely the cause of RPM malfunction This can be caused by either excessively tight shimming of the propeller blades or internal corrosion or part failure causing binding Corrective Action Check amount of blade play A total lack of blade shake may indicate excessively tight blade shims tf this is suspected have propelier checked by a qualified FAA approved propeller repairman This check and any correction may be performed on the aircraft 4 Symptom Governor exposed to Propeller Ground Strike Propeller Engine Lightning Strike Engine Detonation Oil Contamination or Sudden Engine Stoppage Possible Cause Definition of ground strike or lightning strike can be found in McCauley Service Bulletin 215 X definition of engine detonation engine oil contamina tion sudden engine stoppage can be found in engine manufacturer s service information Corrective Action Governors must be tagged with specific damage and overhauled 18 McCauley Propelier Systems MPC 25 Governor Overhaul Requirements and Storage Requirements Overhaul Requirements McCauley has published overhaul requirements for all g
11. tended to and does not cover the costs of normal maintenance or overhaul In addition McCauley will repair or replace at its option any propeller propeller parts governor or governor parts requiring replacement due to manufacturing defect if found at or before the first recommended overhaul interval as described in McCauley published service information This first overhaul coverage does not include labor standard overhaul replace ment parts parts repairable via published service information re plating painting etc other costs associated with the propeller or governor overhaul or export import duties and or sales or use taxes nor does it apply to defects found after McCauley published overhaul hour or calendar limits The provisions of this limited warranty do not apply to any McCauley parts which have been subject to misuse negligence or accident or which have been repaired or altered in any way so as in the judgment of McCauley to adversely affect their performance stability or reliability to normal maintenance services such as cleaning mechanical adjust ments and maintenance inspections to the replacement of service items made in connection with normal maintenance to normal deterioration of soft trim and appearance items such as paint and rubberlike items due to wear and exposure to propellers governors or parts found defective beyond the McCauley recommended overhaul period or to parts which have been improperly install
12. terclockwise to increase RPM Note that one full screw turn will cause an increase of approximately 25 RPM Perform another test flight to confirm adjustments were sufficient Check governor for leakage none permitted 14 McCauley Propeller Systems MPC 25 Governor Maintenance McCauley Governors require no regularly scheduled maintenance but the following practices can insure dependable operation 1 Changing engine oil at frequent periods will greatly extend the operation and life of your governor Maintaining a dynamically balanced propeller will limit vibrations that effect wear on governor parts Checking tightness and security of ali external screws nuts and levers as part of each routine engine inspection will help maintain optimal safe performance Performing regular system maintenance will benefit the governor The engine propeller and govemor work as a system each component depends on the other to perform its job A properly maintained engine will help ensure the ability of the governor to maintain a constant RPM under varying flight conditions 15 McCauley Propeller Systems MPC 25 Governor Troubleshooting 1 Symptom Propeller Surging or Wandering Possible Cause Excessive Transfer Bearing Leakage Engine with excessive transfer bearing leakage can experience surging since the governor may not be able to get enough pressure to the propeller This causes a delay in propeller respons
13. up McCauley s practice is to set the low blade angle so that rated takeoff RPM is not reached until the aircraft has reached some significant groundspeed during roll out At this time and only this time the propeller is controlled by the gavemor The advantage of this practice is that the maximum static RPM can be used as a check on developed horsepower as with a fixed pitch propeller Any loss of maximum horsepower over time is readily apparent during a preflight static run up If propeller remains in low pitch after takeoff engine will overspeed Control of the propeller at this point is with the throttle 10 McCauley Propeller Systems MPC 25 Governor Installation Instructions Prepare new mounting gasket P N B 20024 Coat gasket with Dow Coming 7 compound release agent or equivalent before installation Check that mounting studs project a minimum of 1 250 in 31 75 mm from face of engine pad Clean engine pad studs and mounting hardware before installing new mounting gasket Ensure governor drive spline mates correctly with engine accessory drive spline If drive spline does not align correctly with engine accessory drive rotate engine crankshaft until splines engage correctly Attach mounting hardware and torque the 4 mounting nuts to 100 140 Ibf in 11 3 15 82 Nm If installing a push pull bracket remove only those screws necessary to install bracket Install push pull linkage brace to top of governor and tor
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