(a) If the resistance values are in the specified limits: R - replace the Transient Bleed Valve (TBV) (Ref. AMM TASK 75-26-R 10-000-001) and (Ref. AMM TASK 75-26-10-400-001).
1 If the fault continues:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(b) If the resistance values are out of the specified limits:
- disconnect the harness HJ7 from the HMU and do a check of the resistance of the HMU between: . pins 20 and 40 (17 to 23 ohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness HJ7 (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
2 If the resistance values are out of the specified limits:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(3) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. Do the test given in Para. 3.A.
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TASK 75-26-00-810-812
Failure of the TBV valve on Engine 2
1. Possible Causes
_______________
- ECU (4000KS)
- Transient Bleed Valve (TBV)
- HMU
- harness HJ8
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 73-21-50-000-041 Removal of the HJ8 Harness
AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses
AMM 73-21-50-400-041 Installation of the HJ8 Harness
R 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
R (ECU)(4000KS) AMM 73-29-00-710-040 Operational Test of the FADEC on the ground (with Engine Motoring)
R AMM 75-26-10-000-001 Removal of the Transient Bleed Valve
R AMM 75-26-10-400-001 Installation of the Transient Bleed Valve
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 2B on the ground (with engine motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
_______________
A. If the test gives the maintenance message TBV VLV, HMU:
- Disconnect the HJ8 harness fron the J8 receptacle on the ECU (4000KS). Make sure that the electrical contacts of the J8 receptacle are not bent or have not moved (Ref. AMM TASK 73-21-50-210-002).
(1) If you find damage:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
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(2) Do a resistance check of the TBV valve circuits (channel B) through the HJ8 harness, between: . pins 20 and 40 (17 to 23 ohms).
(a) If the resistance values are in the specified limits: R - replace the Transient Bleed Valve (TBV) (Ref. AMM TASK 75-26-R 10-000-001) and (Ref. AMM TASK 75-26-10-400-001).
1 If the fault continues:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(b) If the resistance values are out of the specified limits:
- disconnect the harness HJ8 from the HMU and do a check of the resistance of the HMU between: . pins 20 and 40 (17 to 23 ohms).
1 If the resistance values are in the specified limits:
_
- replace the defective harness HJ8 (Ref. AMM TASK 73-21-50-000-041) and (Ref. AMM TASK 73-21-50-400-041).
2 If the resistance values are out of the specified limits:
_
- replace the HMU (Ref. AMM TASK 73-21-10-000-002) and (Ref. AMM TASK 73-21-10-400-002).
(3) If the fault continues:
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
B. Do the test given in Para. 3.A.
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