2
_ R R R
R
R R R 3
_
F EEFF : ALL E E ECES If no damage is found:
- clean the connector and receptacle with a bristle brush and stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
- do an electrical resistance test through the HMU receptacle between: . pins 21 and 41 (< 5 ohms) . pins 21 and 8 (> 10 megohms) . pin 21 and the ground (> 10 megohms).
a_ If the resistance values are out of the specified limits:
- replace the HMU (Ref. AMM TASK 73-21-10-000-001) and
(Ref. AMM TASK 73-21-10-400-001).
b If the resistance values are in the specified limits:
_
- reconnect the J7 harness
- disconnect the J7 harness from the ECU (4000KS) receptacle
- visually examine the ECU (4000KS) receptacle and the J7 harness connector for damaged pins or contamination (Ref. AMM TASK 73-21-50-210-002).
c If harness connector or ECU receptacle is damaged:
_ - repair or replace as required.
d If no damage is found:
_
- clean the connector and receptacle with a bristle brush and stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
- do an electrical resistance test through the HMU receptacle between: . pins 21 and 41 (< 5 ohms) . pins 21 and 8 (> 10 megohms) . pin 21 and the ground (> 10 megohms).
e If the resistance values are in the specified limits:
_
- replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref. AMM TASK 73-21-60-400-001).
f If the resistance values are out of the specified limits:
_
- replace the J7 harness (Ref. AMM TASK 73-21-50-000-006) and (Ref. AMM TASK 73-21-50-400-006).
If the fault continues during the subsequent flights:
- remove the HMU (Ref. AMM TASK 73-21-10-000-001)
- inspect main fuel pump shaft.
a If damaged/broken or worn:
_
- replace the main fuel pump (Ref. AMM TASK 73-11-10-000-001) and (Ref. AMM TASK 73-11-10-400-001).
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_
- replace the HMU (Ref. AMM TASK 73-21-10-000-001) and (Ref. AMM TASK 73-21-10-400-001).
B. Do the test given in Para. 3.A.
(1) No additional maintenance action is required if the fault is not confirmed.
(2) Repeat the fault isolation procedure if the fault continues.
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TASK 73-20-00-810-942
Loss of the HMU Overspeed Governor - Engine 2 - Channel B
1. Possible Causes
_______________
- Hydromechanical Unit (HMU)
- Main Fuel Pump (MFP)
- ECU (4000KS)
- J7 harness
2. Job Set-up Information
______________________
R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION
R -------------------------------------------------------------------------------
R No specific bristle brush
R B. Consumable Materials
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R Material No. CP2011 *
R stoddard solvent (Ref. 70-30-00)
R C. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 71-00-00-710-003 AMM 73-11-10-000-001 AMM 73-11-10-400-001 AMM 73-21-10-000-001 AMM 73-21-10-400-001 AMM 73-21-50-000-006 R AMM 73-21-50-210-002 AMM 73-21-50-400-006 AMM 73-21-60-000-001 AMM 73-21-60-400-001
3. Fault Confirmation
__________________
Engine Automatic StartRemoval of the Fuel Pump and Filter AssemblyInstallation of the Fuel Pump and Filter AssemblyRemoval of the Hydromechanical Unit (HMU)Installation of the Hydromechanical Unit (HMU)Removal of J7 Harness Visual Inspection of the Wiring HarnessesInstallation of the J7 HarnessRemoval of the Electronic Control Unit (ECU)(4000KS)Installation of the Electronic Control Unit (ECU)(4000KS)
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