(1) Start the engine (Ref. TASK 71-00-00-710-003) and let it become stable at minimum idle for 5 minutes.
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(2) Operate the engine at 70 percent N1 or above it necessary to pressure the oil system and to get accurate results during leakage check.
(3) Operate the engine at minimum idle and let it become stable for 5 minutes.
(4) Stop the engine (Ref. TASK 71-00-00-710-028).
(5) If there are any, drain the leaks that have collected in the reservoir during the engine operation as follows:
(a) Put a container with graduation (ml or cc) below the poppet valve at the bottom of the reservoir.
(b) Push the poppet valve to let the fluid drain in the container.
(c) Release the poppet valve.
(6) Calculate the leakage rate of the replacement seal. The oil quantity collected in the graduated container and the time of engine operation permit to calculate the leakage rate.
(7) This leakage rate must be less than 20 ml/hr (1 cc/3 minutes) for each of the pads that follow:
- starter pad
- IDG pad
- hydraulic pump pad
- fuel pump pad
NOTE : The 20 ml/hr (1 cc/3 minutes) maximum limit applies only to
____
the engine oil leaks that come from these four pads.
(8) If the leakage rate is near the maximum limit and if you are not sure about the nature/source of the fluid collected from the fuel pump pad, which could leak a mix of engine oil and fuel and the hydraulic pump pad, which could leak a mix of engine oil and hydraulic fluid, isolate more accurately the leak sources (Ref. TASK 71-00-00-790-002)
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________ Subtask 71-00-00-410-099
A. Close Access
(1) Make sure that the work area is clean and clear of tool(s) and other items.
(2) Close the fan cowl doors (Ref. TASK 71-13-00-410-040):
FOR 1000EM1
437AL, 438AR
FOR 1000EM2
447AL, 448AR
(3) Remove the warning notice(s).
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TASK 71-00-00-790-008
Leak Test of the Accessory Gearbox pad (AGB) Starter cavity (between equipement and AGB)
1. Reason for the Job
__________________
To make sure that there is no starter drive shaft missing or damaged o-ring
causing oil leakage.
This procedure can be applied to all AGB pads receiving hydraulic equipement
on all CFM engine model.
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific warning notice
No specific Torque Wrench : range 96.00 to 900.00 lbf.in
(1.00 to 10.00 m.daN)
856A2675 1 TOOL SET, LEAK TEST - AGB/EQUIPMENT CAVITY
B. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
71-13-00-010-040 Opening of the Fan Cowl Doors
71-13-00-410-040 Closing of the Fan Cowl Doors
71-73-49-000-003 Removal of the Starter Pad Oil Drain Tube
71-73-49-400-003 Installation of the Starter Pad Oil Drain Tube
71-00-00-991-372 Fig. 543
3. Job Set-up
__________
Subtask 71-00-00-941-079
A. Safety Precautions
(1) On the center pedestal, on the ENG panel 115VU:
(a) Put a warning notice to tell persons not to start the engine.
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(2) Make sure that the engine 1(2) shutdown occurred not less than 5 minutes before you do this procedure.
(3) On the overhead maintenance panel 50VU:
(a) Make sure that the ON legend of the ENG/FADEC GND PWR/1(2) pushbutton switch is off.
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