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Loss of the Feedback Signal of the N1 Speed Sensor - Engine 2 - Channel B
1. Possible Causes
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- SENSOR-N1 ROTATIONAL SPD (4000EV)
- ECU (4000KS)
- HJ10 harness
2. Job Set-up Information
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A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------REFERENCE QTY DESIGNATION -------------------------------------------------------------------------------
No specific bristle brush
B. Consumable Materials
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Material No. CP2011 * stoddard solvent (Ref. 70-30-00)
C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 73-21-50-000-043 Removal of the HJ10 Harness AMM 73-21-50-210-002 Visual Inspection of the Wiring Harnesses AMM 73-21-50-400-043 Installation of the HJ10 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
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A. Do the operational test of the FADEC 2B 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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R A. The failure message is generated if channel A and channel B inputs from
R the N1 sensor disagree.
R (1) If the failure message N1 SNSR, J10, ECU* is not confirmed:
R (a) No maintenance action is required.
R (2) If the failure message N1 SNSR, J10, ECU* is not confirmed but is
R repetitive:
R - disconnect HJ10 harness from the N1 sensor (N1-B connector).
R (a) Visually examine the receptacle and the connector for damaged
R pins or contamination (Ref. AMM TASK 73-21-50-210-002).
R 1_ If damage is found:
R - repair or replace as required.
R 2_ If no damage is found:
R - do a cleaning of the connector and receptacle using a
R bristle brush with stoddard solvent (Material No. CP2011)
R (Ref. AMM TASK 73-21-50-210-002).
R (b) If the failure continues during the subsequent flights:
R - replace the SENSOR-N1 ROTATIONAL SPD (4000EV) (Ref. AMM TASK
R 77-11-10-000-002) and (Ref. AMM TASK 77-11-10-400-002).
R (c) If the failure continues during the subsequent flights:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001) and
R (Ref. AMM TASK 73-21-60-400-001).
R (d) If the failure continues during the subsequent flights:
R - replace the HJ10 harness (Ref. AMM TASK 73-21-50-000-043) and
R (Ref. AMM TASK 73-21-50-400-043).
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