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 NOTE : Trend Monitoring should be reviewed first to determine whether the
____ EGT higher on one engine can be explained based on the level of deterioration of the engine. Also, a shift on Trend Monitoring only noted on EGT and not affecting N2 and VSV should definitively concentrate the troubleshooting on the EGT indicating system.
 (1) If the EGT of one engine has a sudden EGT shift compare to the other engine:
 - Do a check of the Post Flight Report (PFR), of the Schedule Maintenance Report (SMR) or Class 3 Report (Ref. AMM TASK 73-21-60-740-007) and of the FADEC Last Leg Report for failure message including the following words: VBV, VSV, HPV, PRV, NAC TEMP, T495 SNSR
 (a) If failure message is present:

 - do the related troubleshooting procedure.

 (b) If nothing is found:

 - Do a visual inspection of the variable bleed valve system VBV system (Ref. AMM TASK 75-31-00-210-002). Check for VBV flexible shaft failure and for offset between the VBV actuator doors (doors set in different positions).

 - Do a visual inspection of the VSV system (Ref. AMM TASK 75-32-10-210-002).

 - Do an inspection/check for Foreign Object Damage (Ref. AMM TASK 72-00-00-200-006).

 

 1 If damage is found:
_ - repair as necessary.
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_
 - do a check for correct operation of the pack flow control valves (Ref. TASK 21-51-00-810-807) and (Ref. TASK 21-51-00-810-808).
 a if damage is found:
_ - repair as necessary
 b if nothing is found, continue the troubleshooting as
_
 follows.

 (2) Do a check of the IP check valve (Ref. AMM TASK 36-11-41-200-001).
 (a) If damage is found:

 - repair as necessary.

 (b) If nothing is found (following troubleshooting is preferably to be done on a cold engine):

 1 Disconnect the CJ13 harness from the T495 main junction box
_ (located in the leftcore compartment) and visually examine the T495 junction box receptacle and the CJ13 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
 a If damage is found:
_ - repair as neessary.
 b If nothing is found, continue the troubleshooting as
_
 follows:

 (3) Do an electrical resistance test through the main junction box between: . pins A and B (1 to 10 ohms) . pin A and the ground (> 20 megohms).
 (a) If the resistances are out of the specified limits:

 - Do an electrical resistance test of the T495 thermocouple wiring harness (probes lead assemblies and extension leads assemblies) (Ref. AMM TASK 77-21-10-200-002).

 (b) If the resistances are in the specified limits:

 - Reconnect the CJ13 harness on the Main Junction Box, disconnect the J13 harness from the ECU (4000KS) and visually examine the ECU receptacle and the harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
 1 If damage is found:
_ - repair as necessary.
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 2 If nothing is found:

_
 - do a resistance check of the cable between: . pins 12 and 13 (1 to 10 ohms) . pins 12 and 24 (> 20 megohms) . pin 12 and the ground (> 20 megohms).
 a if the resistances are in the specified limits:
_
 - no further maintenance action is required.
 b if the resistances are out of the specified limits:
_
 - replace the harness CJ13 (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
 (4) If the fault continues during subsequent flights:

 - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).

 (5) If the fault continues during subsequent flights:

 (6) Do a borescope inspection of the HPT Blades (Ref. AMM TASK 72-52-00-290-001).

 (7) Do a borescope inspection of the LPT Blades through the S17 port (Ref. AMM TASK 72-54-00-290-005).

 (8) Do a borescope inspection of the HPC Blades (Ref. AMM TASK 72-31-00-290-002).

 (a) If nothing is found:
 - replace the harness J13 (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).

 (9) If the fault continues during subsequent flights:

 NOTE : Only if Service Bulletin 73-133 (cut dead end of fuel nozzle
　
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