R (15) Do a check for correct torquing and sealing of the cover plates and
R bleed bias adaptor installed on the combustor case just upfront of
R the fuel manifold:
R - replace the gasket seal if suspect.
R (16) If no evidence of hot air leaks from the engine is found:
R - do one of the following procedures for leakage identification
R (leakage identification with engine at idle using aluminum foil or
R leakage identification with engine motoring or leakage
R identification with engine at idle using leak developer).
R
R B. Leakage Identification at Idle using Aluminum Foil.
R NOTE : This procedure is mainly applicable if you suspect a leak located
____ R at a piping or duct joint.
R (1) Install aluminum foils around all pneumatic bleed ducts and engine R air piping connections.
R (2) Close the thrust reverser doors (Ref. AMM TASK 78-36-00-410-040).
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R (3) Do a minimum idle leak check (Ref. AMM TASK 71-00-00-710-006).
R - On the AIR COND panel 30VU, push the ENG 1 BLEED pushbutton switch
R (4HA1) to operate the engine bleed system.
R - On the ANTI-ICE section of the panel 25VU, push the ANTI ICE/ENG 1
R pushbutton switch (2DN1) to operate the engine anti-ice system.
R (4) Stop the engine (Ref. AMM TASK 71-00-00-710-028).
R (5) Open the thrust reverser doors (Ref. AMM TASK 78-36-00-010-040).
R (6) Do a visual inspection of the aluminum foil condition. Correct the
R hot air leaks where applicable.
R (7) If no leak identified:
R - repeat the inspection of the aluminum foils after a few flights.
R C. Leakage Identification with Engine Motoring.
R WARNING : AVOID PHYSICAL CONTACT WITH THE HARDWARE LOCATED IN THE CORE
_______ R COMPARTMENT (MAINLY ON THE TOP AREA) IF THE ENGINE IS STILL R HOT. ENGINE HARDWARE MAY BE VERY HOT IN THIS AREA IF THE R TROUBLE SHOOTING IS PERFORMED WITHIN 2 HOURS AFTER AN ENGINE R SHUTDOWN.
R NOTE : It is preferable to do this procedure on a cold engine.
____
R (1) Secure the fan rotor blades with straps.
R NOTE : Use straps between one fan blade and a fan frame strut at two
____ R locations to block the rotation of the fan rotor. Make sure no R metallic locking device is in contact with the fan blade, the R OGV or the fan frame strut to avoid damage.
R (2) Do a dry motoring of the engine for 2 minutes (Ref. AMM TASK 71-00-R 00-710-001).
R NOTE : Several air motoring runs may be required to allow all checks
____ R to be done per next steps.
R (3) While the engine is motoring, spray a soap base leak-tek 16-OX
R (Material No. CP2170) on all hardware connections (ducts, pipes,
R valves, sensor pads, fuel nozzle pads) and look for evidence of an
R air leak.
R NOTE : Two mechanics are required (one located on each side of the
____ R engine core) to properly perform this task.
R (4) If a leak developer is not available, an air leak can usually be R detected by a tactile test (an air stream can be felt by hand).
R (5) Correct the hot air leaks where applicable.
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R (6) Remove the straps from the fan rotor blades.
R D. Leakage Identification at Idle using Leak Developer.
R (1) Apply a leak developer Ardrox 9D4A (Material No. CP3010) around
R duct/air pipe joints and on valves, sensor seatings on combustor, HP
R compressor and turbine cases.
R (2) Do a minimum idle leak check (Ref. AMM TASK 71-00-00-710-006).
R - On the AIR COND panel 30VU, push the ENG 1 BLEED pushbutton switch
R (4HA1) to operate the engine bleed system.
R - On the ANTI-ICE section of the panel 25VU, push the ANTI ICE/ENG 1
R pushbutton switch (2DN1) to operate the engine anti-ice system.
R (3) Stop the engine (Ref. AMM TASK 71-00-00-710-028)
R (4) Do a visual inspection of the hardware and check for evidence of an
R air leak. Correct the hot air leaks where applicable.
R - Remove the material used to check leaks.
