3. Fault Confirmation
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A. Do the operational test of the FADEC 2A and 2B on the ground (with engine non motoring) (Ref. AMM TASK 73-29-00-710-040).
4. Fault Isolation
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R A. The failure message is generated if both channel A and channel B signals
R are invalid or out of range.
R (1) If the failure messages N1 SNSR, J9, ECU and N1 SNSR, J10, ECU are
R not confirmed:
R (a) No maintenance action is required.
R (2) If the failure messages N1 SNSR, J9, ECU and N1 SNSR, J10, ECU are
R not confirmed but are repetitive:
R - disconnect HJ9 harness from the N1 sensor (N1-A connector) and
R disconnect HJ10 harness from the N1 sensor (N1-B connector).
R (a) Visually examine the receptacles and the connectors 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 connectors and receptacles 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 (e) 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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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 receptacles and the connectors 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)
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 connector HJ9 from the ECU (4000KS) receptacle and
R visually examine the receptacles and the connectors 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 HJ9 harness
R between:
R . pins 16 and 17 (40 to 80 ohms) R R for S/N different than 25451 and up
R . pins 16 and 6 (>5 kiloohms)
R . pin 16 and the ground (>10 megohms) R R for S/N 25451 and up
R . pins 16 and 6 (>10 megohms)
R . pin 16 and the ground (>10 megohms).
R a_ If the resistance values are in the specified limits:
R - replace the ECU (4000KS) (Ref. AMM TASK 73-21-60-000-001)
R and (Ref. AMM TASK 73-21-60-400-001).
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R b_ If the resistance values are out of the specified limits:
R - replace the HJ9 harness (Ref. AMM TASK 73-21-50-000-042)
R and (Ref. AMM TASK 73-21-50-400-042).
R (4) If the failure message N1 SNSR, J10, ECU is confirmed:
R - disconnect the HJ10 harness from the N1 sensor (N1-B connector).
R (a) Visually examine the receptacles and the connectors for damaged 中國航空網 www.k6050.com 航空翻譯 www.aviation.cn 本文鏈接地址：A320 Trouble Shooting Manual 排故手冊 發動機指示(120)
