STANDBY DATA : ATTITUDE AND HEADING - FAULT ISOLATION PROCEDURES
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TASK 34-22-00-810-801
Standby Compass Information not Accurate
1. Possible Causes
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- COMPASS-STANDBY (2FN)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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R AMM 34-22-00-710-001 Operational Check of the standby compass including
R light test and visual check AMM 34-22-00-730-001 Compensation Adjustment/Test of the Standby Compass AMM 34-22-23-000-001 Removal of the Standby Compass (2FN) AMM 34-22-23-400-001 Installation of the Standby Compass (2FN)
3. Fault Confirmation
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A. Test
(1) Do the operational test of the standby compass (Ref. AMM TASK 34-22-00-710-001).
4. Fault Isolation
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A. If the standby compass shows out of tolerance values:
- do the adjustment/test of the standby compass (Ref. AMM TASK 34-22-00-730-001).
(1) If the fault continues:
- replace the COMPASS-STANDBY (2FN) (Ref. AMM TASK 34-22-23-000-001) and (Ref. AMM TASK 34-22-23-400-001).
Failure of the Standby Horizon Indicator
1. Possible Causes
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- IND-STANDBY HORIZON (7FN)
- wiring of the 28VDC signal from the circuit breaker (5FN) to the standby horizon indicator (7FN)
- wiring of the ground signal at the standby horizon indicator (7FN)
- C/B-NAV/STBY/HORIZON (5FN)
2. Job Set-up Information
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A. Referenced Information
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REFERENCE DESIGNATION
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AMM 34-22-24-000-001 Removal of the Standby Horizon Indicator (7FN) AMM 34-22-24-400-001 Installation of the Standby Horizon Indicator (7FN) ASM 34-22/01
3. Fault Confirmation
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A. Make sure that this(these) circuit breaker(s) is(are) closed:
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PANEL DESIGNATION IDENT. LOCATION
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**ON A/C 001-049, 051-099, 101-105, 151-199, 201-212, 214-220,
49VU STBY/HORIZON 5FN F12 R **ON A/C 106-149, 213-213, 221-299, 301-399, 401-499,
49VU STBY/INST 5FN F12 **ON A/C ALL
B. Test
(1) Not applicable, the fault is evident.
(a) If the circuit breaker (5FN) trips, refer to Para. 4.B. of this trouble shooting procedure.
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞34-22-00∞∞∞∞∞∞∞∞∞∞Page 202
Aug 01/05 CES
4. Fault Isolation
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A. If the circuit breaker (5FN) is closed and if the flag is shown on the standby horizon indicator:
- do a check for 28VDC at the standby horizon indicator (7FN).
(1) If there is 28VDC:
- replace the IND-STANDBY HORIZON (7FN) (Ref. AMM TASK 34-22-24-000-001) and (Ref. AMM TASK 34-22-24-400-001).
(2) If there is no 28VDC:
- do a check of the wiring of the 28VDC signal from the circuit breaker (5FN) to the standby horizon indicator (7FN)
- do a check of the wiring of the ground signal at the standby horizon indicator (7FN), pin A/B (Ref. ASM 34-22/01).
(a) If there is no continuity:
- repair the above wirings.
(b) If there is continuity:
- replace the C/B-NAV/STBY/HORIZON (5FN).
B. If the circuit breaker (5FN) is open and if the flag is shown on the standby horizon indicator:
- close this circuit breaker.
(1) If the circuit breaker (5FN) trips:
- replace the IND-STANDBY HORIZON (7FN) (Ref. AMM TASK 34-22-24-000-001) and (Ref. AMM TASK 34-22-24-400-001).
(a) If the fault continues:
- do a check for a short to ground from the circuit breaker (5FN) to the standby horizon indicator (7FN) (Ref. ASM 34-22/01).
1_ If there is a short to ground:
- repair the above wiring.
2_ If there is no short to ground:
- replace the C/B-NAV/STBY/HORIZON (5FN). 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320 Trouble Shooting Manual 排故手册 导航 NAVIGATION 2(93)
