R . pin 16 and the ground (>10 megohms).
a 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).
b If the resistance values are out of the specified limits:
_
- replace the HJ10 harness (Ref. AMM TASK 73-21-50-000-043) and (Ref. AMM TASK 73-21-50-400-043).
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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Loss of the Feedback Signal of the N1 Speed Sensor - Engine 2 - Channel A
1. Possible Causes
_______________
- SENSOR-N1 ROTATIONAL SPD (4000EV)
- ECU (4000KS)
- HJ9 harness
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific bristle brush
B. Consumable Materials
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
Material No. CP2011 * stoddard solvent (Ref. 70-30-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-042 Removal of the HJ9 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-042 Installation of the HJ9 Harness AMM 73-21-60-000-001 Removal of the Electronic Control Unit (ECU) 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) AMM 77-11-10-000-002 Removal of the N1 Speed Sensor (4000EV) AMM 77-11-10-400-002 Installation of the N1 Speed Sensor (4000EV)
3. Fault Confirmation
__________________
A. Do the operational test of the FADEC 2A on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
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4. Fault Isolation
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A. The failure message is generated if channel A input from the N1 sensor is invalid or out of range.
(1) If the failure message N1 SNSR, J9, ECU is not confirmed: R
R (a) No maintenance action is required.
(2) If the failure message N1 SNSR, J9, ECU is not confirmed but is repetitive:
- disconnect HJ9 harness from the N1 sensor (N1-A connector).
R (a) Visually examine the receptacle and the connector for damaged R pins or contamination (Ref. AMM TASK 73-21-50-210-002).
1 If damage is found:
_ - repair or replace as required.
2 If no damage is found:
_
- do a cleaning of the connector and receptacle using a bristle brush with stoddard solvent (Material No. CP2011) (Ref. AMM TASK 73-21-50-210-002).
(b) If the failure continues during the subsequent flights:
- replace the SENSOR-N1 ROTATIONAL SPD (4000EV) (Ref. AMM TASK 77-11-10-000-002) and (Ref. AMM TASK 77-11-10-400-002).
(c) If the failure 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).
(d) If the failure continues during the subsequent flights:
- replace the HJ9 harness (Ref. AMM TASK 73-21-50-000-042) and (Ref. AMM TASK 73-21-50-400-042).
(3) If the failure message N1 SNSR, J9, ECU is confirmed: R - disconnect the HJ9 harness from the N1 sensor (N1-A connector).
R (a) Visually examine the receptacle and the connector for damaged R pins or contamination (Ref. AMM TASK 73-21-50-210-002).
1 If damage is found:
_ - repair or replace as required.
2 If no damage is found:
_ R - do the electrical resistance test through the N1 sensor R (4000EV) (channel A) between:
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