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 3. Fault Confirmation
__________________
 A. Get the engine take off EGT data, with the use of the MCDU or DAR/QAR data.
 4. Fault Isolation
_______________
 A. Do this trouble shooting if the SB CFMI 72-182 has not been incorporated. If POST SB CFMI 72-182, fault message must be ignored.
 (1) Check for the presence of the following CFDS messages in the Post Flight Report (PFR) and do trouble shooting as required.

 - VBV ACT, HMU

 - T495 SNSR, J13, ECU

 - CHECK HOT AIR LEAKS ENG2

 - HPTCC VLV (POS), HMU

 - BSV, HMU

 

 (2) Do a visual inspection of all the VBV doors actuators and flexible shafts through the fan duct panels. Check for offset of position between all VBV doors (Ref. AMM TASK 75-31-00-210-002).

 (3) If an EGT fluctuation/loss has been reported by the crew, do trouble shooting for the EGT indication (Ref. TASK 77-00-00-810-854) and (Ref. TASK 77-20-00-810-831).

 (4) Check if the Engine Serial Number (ESN) of the engine was entered through the LRU IDENTIFICATION menu of the MCDU before the flight.

 - if yes, no further action is required.
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 (5) Do an inspection of the engine for Foreign Object Damage (FOD or bird strike) (Ref. AMM TASK 72-00-00-200-006).

 (6) Check if an EGT deterioration greater than 50 deg. C (using EGT value recorded in the take off report) is consistant with the EGT trend monitoring data (GEM or ADEPT):

 - if no, do trouble shooting of the EGT system (Ref. TASK 77-00-00-810-849)

 - if yes, no action is required. Further re-occurences of the same CFDS message can be expected during following flights. This is indicative that the remaining EGT margin left on this engine is equal or less than 12 deg. C.

 

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