R a_ if there is movement of the ceramic insulators
R - replace the HPTACC valve (Ref. AMM TASK 75-21-10-000-002)
R and (Ref. AMM TASK 75-21-10-400-002).
R b_ if there is no movement of the ceramic insulators, continue
R the troubleshooting as follows:
(b) Do a visual inspection of the 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).
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1 If damage is found:
_ - repair as necessary.
2 If nothing is found, continue the troubleshooting as follows:
_
(c) Do an inspection/check for Foreign Object Damage (Ref. AMM TASK 72-00-00-200-006) .
1 If damage is found:
_ - repair as necessary.
2 If nothing is found, continue the troubleshooting as follows:
_
(d) Do a visual inspection of the VSV system (Ref. AMM TASK 75-32-10-210-002) .
1 If damage is found:
_ - repair as necessary.
2 If nothing is found, continue the troubleshooting as follows:
_
(e) Do a visual inspection of the IP Bleed Check Valve for free operation and condition of the flappers (Ref. AMM TASK 36-11-00-710-001) .
1 If damage is found:
_ - repair as necessary.
2 If nothing is found and the cause of the EGT overlimit cannot
_ be explained (troubleshooting preferably to be done on a cold engine), continue the troubleshooting as follows:
(f) Disconnect the HJ13 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 the HJ13 harness connector or the ECU receptacle is
_
damaged:
- repair as required.
2 If nothing is found, continue the troubleshooting as follows:
_
(g) Do an electrical resistance test through the HJ13 harness between: . pins 12 and 13 (1 to 10 ohms) . pins 12 and 24 (> 20 megohms) . pin 12 and the ground (> 20 megohms).
1 If the resistances are out of the specified limits:
_
- Disconnect the CJ13 harness from the T495 main junction box (located in the left core compartment) and visually examine the T495 junction box receptacle and the CJ13 harness
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connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002). Clean the connector and the receptacle using a bristle brush and stoddard solvent (Material No. CP2011) or white spirit (Material No. CP2010).
a If nothing is found:
_
- 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)
- If the resistances are in the specified limits:
- reconnect the CJ13 harness to the main junction box,
and repeat the electrical resistance test through the
HJ13 harness at the ECU connector between:
. pins 12 and 13 (1 to 10 ohms)
. pins 12 and 24 (> 20 megohms)
. pin 12 and the ground (> 20 megohms).
* if the resistances are in the specified limits:
- no further maintenance is required.
* if the resistances are out of the specified limits:
- replace the CJ13 harness (Ref. AMM TASK 73-21-50-000-029) and (Ref. AMM TASK 73-21-50-400-029).
** if the fault continues during subsequent flights:
- replace the HJ13 harness (Ref. AMM TASK 73-21-50-000-046) and (Ref. AMM TASK 73-21-50-400-046).
2 If the resistances are in the specified limits:
_
- Disconnect the CJ13 harness from the T495 main junction box (located in the left core 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). Clean the connector and the receptacle using a bristle brush and stoddard solvent (Material No. CP2011) or white spirit (Material No. CP2010).
a Reconnect the CJ13 harness to the main junction box.
_
(h) If the fault continues during subsequent flights:
1 replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
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