R TASK 24-20-00-810-940

R Failure of the APU generator AC Current Transformer or its Wiring R 1. Possible Causes
_______________
R - CT-AC, APU GEN (42XS)
R - GAPCU (24XG)
R - wiring

R 2. Job Set-up Information

______________________
R A. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R AMM 24-23-17-000-001 R AMM 24-23-17-400-001 R AMM 24-41-00-861-002 R R AMM 24-41-00-862-002 R R AMM 24-41-34-000-001 R R AMM 24-41-34-400-001 R R ASM 24-23/01
R 3. Fault Confirmation
__________________
R A. Test
R Not applicable.

Removal of the AC Current Transformer (42XS) Installation of the AC Current Transformer (42XS) Energize the Aircraft Electrical Circuits from the APU De-energize the Aircraft Electrical Circuits Supplied from the APU Removal of the Ground Auxiliary Power Control Unit (GAPCU) (24XG) Installation of the Ground Auxiliary Power Control Unit (GAPCU) (24XG)
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 CTA (42XS)/GAPCU
R (24XG) and the upper ECAM-DU warning APU GEN FAULT:
R - do an electrical resistance test of the APU generator AC current
R transformer (42XS) (Ref. ASM 24-23/01) between:

R . pin 1 and pin 4 (10.15 ohms plus or minus 3.45 ohms)

R . pin 2 and pin 4 (10.15 ohms plus or minus 3.45 ohms)

R . pin 3 and pin 4 (10.15 ohms plus or minus 3.45 ohms).

R (1) If the resistance values are out of the specified limits:
R - replace the CT-AC, APU GEN (42XS) (Ref. AMM TASK 24-23-17-000-001)
R and (Ref. AMM TASK 24-23-17-400-001).

 「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 : 401-499, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page C243
 Aug 01/05 CES

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 1 of the APU generator AC current transformer and pin A/12B 
R  of the GAPCU 
R  . pin 2 of the APU generator AC current transformer and pin A/12A 
R  of the GAPCU 
R  . pin 3 of the APU generator AC current transformer and pin A/11A 
R  of the GAPCU 
R  . pin 4 of the APU generator AC current transformer and pin A/11B 
R  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). 
R  (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 24-20-00-810-941

R Failure of the APU Generator Channel
R 1. Possible Causes_______________
R - feeders
R 2. Job Set-up Information______________________
R A. Fixtures, Tools, Test and Support Equipment
R -------------------------------------------------------------------------------R REFERENCE QTY DESIGNATION R -------------------------------------------------------------------------------
R No specific circuit breaker(s) safety clip(s)
R B. Referenced Information
R -------------------------------------------------------------------------------R REFERENCE DESIGNATION R -------------------------------------------------------------------------------
R 24-20-00-810-862 Failure of the Generator 1 Channel R 24-20-00-810-863 Failure of the Generator 2 Channel R AMM 24-41-00-861-002 Energize the Aircraft Electrical Circuits from the R APU R AMM 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied R from the APU R ASM 24-22/02 R ASM 24-22/03 R ASM 24-23/01 R ASM 24-41/01
　
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