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 N2 sensor is invalid or out of range.
(1) If the failure message N2 SNSR, J7, ECU is not confirmed: R
R (a) No maintenance action is required.
(2) If the failure message N2 SNSR, J7, ECU is not confirmed but is repetitive:
- disconnect HJ7 harness from the N2 sensor (N2-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-N2 ROTATIONAL SPD (4001EV) (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).
(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 HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
(3) If the failure message N2 SNSR, J7, ECU is confirmed: R - disconnect the HJ7 harness from the N2 sensor (N2-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 N2 sensor R (4001EV) (channel A) between:
. pins 1 and 2 (40 to 80 ohms) . pins 1 and 3 (>10 megohms)
R . pin 1 and the ground (>10 megohms).
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a If the resistance values are out of the specified limits:
_
- replace the N2 sensor (4001EV) (Ref. AMM TASK 77-11-20-000-002) and (Ref. AMM TASK 77-11-20-400-002).
b If the resistance values are in the specified limits:
_ R - connect the HJ7 harness to the N2 sensor.
R (b) Disconnect the HJ7 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).
1 If damage is found:
_ - repair or replace as required.
2 If no damage is found:
_ R - do the electrical resistance test through the HJ7 harness R between:
. pins 2 and 11 (40 to 80 ohms) . pins 2 and 3 (>10 megohms)
R . pin 2 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 HJ7 harness (Ref. AMM TASK 73-21-50-000-040) and (Ref. AMM TASK 73-21-50-400-040).
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 N2 Speed Sensor - Engine 2 - Channel B
1. Possible Causes
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- SENSOR-N2 ROTATIONAL SPD (4001EV)
- ECU (4000KS)
- HJ8 harness
2. Job Set-up Information 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(133)
