R 4. Fault Isolation
_______________
R CAUTION : BEFORE YOU START THE CHECK OF IDG WIRING THAT INCLUDES CONNECTORS,
_______ R EXAMINE EACH CONNECTOR TO MAKE SURE THAT THERE IS NO OIL IN IT. R IF YOU FIND OIL, CLEAN THE CONNECTOR AND CONNECT IT AGAIN. R IF THE FAILURE CONTINUES, DO THE TROUBLE SHOOTING PROCEDURE AS R GIVEN BELOW.
R A. If the fault symptom is identified by the CFDS message GAPCU (24XG) EXC
R FLD/ GEN APU (8XS) and the upper ECAM-DU warning APU GEN FAULT:
R - do a check of the resistance of the APU generator exciter-field between
R pins A/9 and A/10 of the APU generator (7.67 ohms plus or minus 0.73
R ohms) (Ref. ASM 24-23/01)
R - do a check of the wiring for a short-circuit between:
R . pin A/9 of the APU generator and APU generator case
R . pin A/10 of the APU generator and APU generator case.
R NOTE : Do the check:
____ R - GTCP 36-300: for metal contamination of the lube filter element R (Ref. AMM TASK 49-91-45-200-002) and the alternator scavenge R filter element (Ref. AMM TASK 49-91-41-200-001). R or R - APS 3200: for metal contamination of the pressure oil filter R element (Ref. AMM TASK 49-91-41-920-001) and the AC-generator R scavenge filter element (Ref. AMM TASK 49-91-41-920-002). R or R - 131-9(A): for metal contamination of the oil filters (Ref. AMM R TASK 49-91-41-200-002).
R (1) If the resistance values are out of the specified limits:
R - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and
R (Ref. AMM TASK 24-23-51-400-001).
R (2) If the resistance values are in the specified limits:
R - do a check of the wiring (Ref. ASM 24-23/01) for a short to ground,
R a short circuit or an open circuit between:
R . pin A/9 of the APU generator and pin C/12 of the GAPCU
R . pin A/10 of the APU generator and pin C/13 of the GAPCU
R . pin C/7 and pins C/12 and C/13 of the GAPCU.
R (a) If the wiring is not correct:
R - repair or replace as necessary.
R (b) If the wiring is correct:
R - replace the GAPCU (24XG) (Ref. AMM TASK 24-41-34-000-001) and
R (Ref. AMM TASK 24-41-34-400-001).
R B. Make sure that the aircraft electrical circuits operate correctly in APU
R configuration.
R (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK
R 24-41-00-861-002).
「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 401-499, ∞∞24-23-00∞∞∞∞∞∞∞∞∞∞Page 219
Aug 01/05 CESR (2) Let the APU generator operate for five minutes to make sure that it R operates correctly.
R (3) De-energize the aircraft electrical circuits from the APU (Ref. AMM R TASK 24-41-00-862-002).
R TASK 24-23-00-810-810
R Failure of the APU Generator
R 1. Possible Causes_______________
R - GEN-APU (8XS)
R - wiring
R 2. Job Set-up Information______________________
R A. Referenced Information
R -------------------------------------------------------------------------------
R REFERENCE DESIGNATION
R -------------------------------------------------------------------------------
R AMM 24-23-51-000-001
R AMM 24-23-51-400-001
R AMM 24-41-00-861-002
R
R AMM 24-41-00-862-002
R
R ASM 24-23/01
R 3. Fault Confirmation
__________________
R A. Test
R Not applicable.
Removal of the APU Generator 8XS Installation of the APU Generator 8XS Energize the Aircraft Electrical Circuits from the APU De-energize the Aircraft Electrical Circuits Supplied from the APU
R NOTE : As the APU GEN was set to OFF because of a true failure, the fault
____ R confirmation is not necessary.
R 4. Fault Isolation
_______________
R A. If the fault symptom is identified by the CFDS message GEN APU (8XS)
R /WRG: GEN APU PMG and the upper ECAM-DU warning APU GEN FAULT:
R - replace the GEN-APU (8XS) (Ref. AMM TASK 24-23-51-000-001) and (Ref.
R AMM TASK 24-23-51-400-001).
R (1) If the fault continues:
R - do a check and repair the wiring (Ref. ASM 24-23/01) for a short to
R shield, a short to ground, a short circuit or an open circuit
R between:
R . pin A/12 of the APU generator and pin C/10 of the GAPCU
R . pin A/13 of the APU generator and pin C/11 of the GAPCU
R . pin A/14 of the APU generator and pin C/9 of the GAPCU 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 电源 3(13)
