(2) Repeat the fault isolation procedure if the fault continues.
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TASK 73-29-00-810-866
Loss of the Feedback Signal from the FMV Resolver through the Channel A on Engine 2
1. Possible Causes
_______________
- Hydromechanical Unit (HMU)
- harness J7
- ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-10-000-002 Removal of the Hydromechanical Unit (HMU) AMM 73-21-10-400-002 Installation of the Hydromechanical Unit (HMU) AMM 73-21-50-000-040 Removal of the HJ7 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-040 Installation of the HJ7 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)(4000KS) AMM 73-21-60-400-001 Installation of the Electronic Control Unit
(ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with Engine non Motoring)
3. Fault Confirmation
__________________
A. Test
(1) Do the operational test of the FADEC 2A on the ground (with engine non - motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. Do this procedure:
NOTE : This fault is generated if channel A FMV resolver signal is out of
____ range, invalid or the signal disagrees with channel B.
(1) If the test does not give the maintenance message J7, HMU(FMVRES), ECU:
- replace the Hydromechanical Unit (HMU), (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
- Visually examine the J7 harness connector for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).
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(a) If damage on a connector is found:
- Replace or repair as required.
(b) If fuel wetting is found:
- replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(c) If nothing is found:
- No further action is required.
(2) If the test does not give the maintenance message J7, HMU(FMVRES), ECU, but is repetitive after the troubleshooting per step 4.A.(1) has been fully done:
- replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(a) If the fault continues during the subsequent flights:
- replace the ECU (4000KS), (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
(3) If the test gives the maintenance message J7, HMU(FMVRES), ECU:
- disconnect the J7 harness from the HMU receptacle (HMU-A) (located in the left core compartment) and visually examine the J7 harness connector and the HMU receptacle for damaged pins, contamination and fuel wetting (Ref. AMM TASK 73-21-50-210-002).
(a) If damage on a connector is found:
- Replace or repair as required.
(b) If fuel wetting is found:
- replace the harness J7, (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(c) If nothing is found:
- Do an electrical resistance test through the HMU receptacle between: . pins 16 and 34 (34 to 46 or 85 to 150 Ohms) . pins 35 and 36 (21 to 29 or 44 to 76 Ohms) . pins 18 and 37 (21 to 29 or 44 to 76 Ohms) . pins 16 and 17 (> 10 Megohms) . pins 35 and 17 (> 10 Megohms) . pins 18 and 17 (> 10 Megohms) . pin 16 and the ground (> 10 Megohms) . pin 35 and the ground (> 10 Megohms) . pin 18 and the ground (> 10 Megohms).
1 If the resistance values are out of the specified limits:
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