TASK 24-20-00-810-836
 Failure of the APU Availability Relay
 1. Possible Causes_______________
 - GCU-APU (1XS)

 - ECB (59KD)

 - RELAY-APU AVAIL (6KD)

 - wiring

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 24-23-34-000-001  Removal of the GCU-APU (1XS)
 AMM 24-23-34-400-001  Installation of the GCU-APU (1XS)
 AMM 24-41-00-861-002  Energize the Aircraft Electrical Circuits from the APU
 AMM 24-41-00-862-002  De-energize the Aircraft Electrical Circuits Supplied from the APU
 AMM 49-61-34-000-001  Removal of the Electronic Control Box (ECB) (59KD) (GTCP 36-300)
 AMM 49-61-34-000-002  Removal of the Electronic Control Box (ECB) (59KD) (APS 3200)
 AMM 49-61-34-400-001  Installation of the Electronic Control Box (ECB) (59KD) (GTCP 36-300)
 AMM 49-61-34-400-002  Installation of the Electronic Control Box (ECB) (59KD) (APS 3200)
 ASM 24-23/02
 ASM 49-61/01
 3. Fault Confirmation__________________
 A. Test
 Not applicable.

 NOTE : As the APU GEN was set to OFF because of a true failure, the fault
____
 confirmation is not necessary.

 「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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 289
 201-299, 301-399, Aug 01/05 CES

 4. Fault Isolation
_______________
 **ON A/C 001-049, 051-099, 101-105, 151-199, 201-210,

 A. If the fault symptom is identified by the CFDS message CHECK GCU APU PIN A6A APU CTL RLY 6KD CKT and the upper ECAM DU warning APU GEN FAULT:
 - replace the RELAY-APU AVAIL (6KD).
 (1) If the fault continues:
 - do a check of the wiring for open circuit: . between the APU generator pin B/2B and the APU availability relay pin A/2, . then between the APU GCU pin A/6A and the APU availability relay pin A/1, . then between the APU relay pin A/X1 and the ECB pin B/J6 (Ref. ASM 24-23/02) and (Ref. ASM 49-61/01).
 (a) If the wiring is not correct:

 - repair the above defective wiring.

 (b) If the wiring is correct:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).

 (c) If the fault continues:

 - replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001).
 **ON A/C 106-149, 211-299, 301-399,
 A. If the fault symptom is identified by the CFDS message CHECK GCU APU PIN A6A APU CTL RLY 6KD CKT and the upper ECAM DU warning APU GEN FAULT:
 - replace the RELAY-APU AVAIL (6KD).
 (1) If the fault continues:
 - do a check of the wiring for open circuit: . between the APU generator pin B/2B and the APU availability relay pin A/2, . then between the APU GCU pin A/6A and the APU availability relay pin A/1, . then between the APU relay pin A/X1 and the ECB pin B/J6 (Ref. ASM 24-23/02) and (Ref. ASM 49-61/01).
 (a) If the wiring is not correct:

 - repair the above defective wiring.

 (b) If the wiring is correct:

 - replace the GCU-APU (1XS) (Ref. AMM TASK 24-23-34-000-001) and (Ref. AMM TASK 24-23-34-400-001).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 290
 201-299, 301-399, Aug 01/05 CES (c) If the fault continues:

 - replace the ECB (59KD) (Ref. AMM TASK 49-61-34-000-002) and (Ref. AMM TASK 49-61-34-400-002).
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 B. Make sure that the aircraft electrical circuits operate correctly in APU configuration:
 (1) Energize the aircraft electrical circuits from the APU (Ref. AMM TASK 24-41-00-861-002).

 (2) De-energize the aircraft electrical circuits from the APU (Ref. AMM TASK 24-41-00-862-002).

 「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 : 001-049, 051-099, 101-149, 151-199, ∞∞24-20-00∞∞∞∞∞∞∞∞∞∞Page 291
 201-299, 301-399, Aug 01/05 CES

 TASK 24-20-00-810-837
　
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