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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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, J9, ECU* is not confirmed:
R (a) No maintenance action is required.
R (2) If the failure message N1 SNSR, J9, ECU* is not confirmed but is
R repetitive:
R - 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).
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 HJ9 harness (Ref. AMM TASK 73-21-50-000-042) and
R (Ref. AMM TASK 73-21-50-400-042).
R (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).
R 1_ If damage is found:
R - repair or replace as required.
R 2_ If no damage is found:
R - do the electrical resistance test through the N1 sensor
R (4000EV) (channel A) between:
R . pins 1 and 2 (40 to 80 ohms)
R
R for S/N different than 25451 and up:
R . pins 1 and 3 (>5 kiloohms)
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R . pin 1 and the ground (>10 megohms)
R
R for S/N 25451 and up:
R . pins 1 and 3 (>10 megohms)
R . pin 1 and the ground (>10 megohms).
R a_ If the resistance values are out of the specified limits:
R - replace the N1 sensor (4000EV) (Ref. AMM TASK 77-11-10-
R 000-002) and (Ref. AMM TASK 77-11-10-400-002).
R b_ If the resistance values are in the specified limits:
R - connect the HJ9 harness to the N1 sensor.
R (b) Disconnect the HJ9 harness from the ECU (4000KS) and visually
R examine the receptacle and the connector for damaged pins or
R 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:
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本文链接地址：A320 Trouble Shooting Manual 排故手册 发动机指示(138)
