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TASK 77-10-00-810-841
Loss of the ECU Cross Channel on Engine 1 - Channel A
1. Possible Causes
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R R - Alternator Stator R - Accessory Gearbox Assembly R - Alternator Rotor R - J9 Harness R - ECU (4000KS)
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
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R AMM 72-63-00-000-003 Removal of the Accessory Gearbox Assembly
R AMM 72-63-00-400-003 Installation of the Accessory Gearbox Assembly
R AMM 73-21-30-000-001 Removal of the Control Alternator
R AMM 73-21-30-400-001 Installation of the Control Alternator
R AMM 73-21-50-000-042 Removal of the HJ9 Harness
R AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses
R AMM 73-21-50-400-042 Installation of the HJ9 Harness
R AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU)
R AMM 73-21-60-400-001 Installation of the Electronic Control Unit (ECU)
AMM 73-29-00-710-040 Operational Test of the FADEC on the Ground (with
Engine non Motoring)
R AMM 79-00-00-281-002 Check of the Electrical Master Chip Detector for
R Particles
3. Fault Confirmation__________________
A. Do the operational test of the FADEC 1A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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R A. If the failure message ECU (A CHANNEL) is not confirmed:
R - no maintenance action is required.
R NOTE : This failure message is generated when there is an internal ECU
____
R cross channel fault, control alternator stator contact, or related
R wiring.
R
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R B. If the failure message ECU (A CHANNEL) is not confirmed but is
R repetitive:
R - do a check of the J9 harness connection at the control alternator:
R (1) If the connection is loose:
R - tighten the connection by hand plus one eighth of a turn.
R NOTE : Soft nose pliers may be used if necessary.
____
R (2) If the connection is tight:
R - Disconnect the J9 harness from the alternator stator.
R (a) Visually examine the alternator stator receptacle and the J9
R harness connector for damaged pins or contamination, and the 90.
R elbow of the harness boot for evidence of overheat (Ref. AMM TASK
R 73-21-50-210-002).
R 1_ If harness or alternator stator connector is damaged:
R - repair or replace as required.
R 2_ If no damage is found:
R - remove the Alternator Stator (Ref. AMM TASK 73-21-30-000-R 001).
R - visually examine the alternator stator and rotor for
R evidence of contact.
R a_ If evidence of contact is found, the cause must be
R determined:
R - inspect the alternator rotor nut for proper installation,
R inspect the Electrical Master Chip Detector for particles
R (Ref. AMM TASK 79-00-00-281-002).
R
R * If chips are found on the chip detector:
R - replace the Accessory Gearbox Assembly (Ref. AMM TASK
R 72-63-00-000-003) and (Ref. AMM TASK 72-63-00-400-003)
R
R * If rubbing is found and chips were not found on the
R chip detector:
R - replace the Alternator Rotor and stator (Ref. AMM TASK
R 73-21-30-000-001) and (Ref. AMM TASK 73-21-30-400-001).
R
R * If no rubbing is noted:
R - reinstall the alternator stator (Ref. AMM TASK 73-21-R 30-400-001).
R b_ If no evidence of contact is found:
R - replace the J9 Harness (Ref. AMM TASK 73-21-50-000-042)
R and (Ref. AMM TASK 73-21-50-400-042)
R (3) If fault continues during the subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and (Ref.
R AMM TASK 73-21-60-400-001).
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