- at the electrical connector (7557VC) do a check for a short circuit between:

 * pins C and B, C and A, C and D, B and A, B and D, A and D and,

 * GND and pins A, B, C and D.
 (Ref. ASM 21-51/01).

 (a) If there is a short circuit repair the related wiring between:

 - connector (7557VC) pin C and PC 2 connector (27HHAB) pin 10B,

 - connector (7557VC) pin B and PC 2 connector (27HHAB) pin 9D,

 - connector (7557VC) pin A and PC 2 connector (27HHAB) pin 9C,

 - connector (7557VC) pin D and PC 2 connector (27HHAB) pin 10C. (Ref. ASM 21-51/01).

 - connect the electrical connector (7557VCA). (Ref. AMM TASK 21-51-11-400-001).

 (b) If there is no short circuit connect the electrical connector (7557VCA). (Ref. AMM TASK 21-51-11-400-001).

 (3) If the fault continues:

 - disconnect the electrical connector (34HHA) (Ref. AMM TASK 21-61-15-000-001) and,

 - at the electrical connector (34HHA) do a check for a short circuit between:

 * pins A and B, A and C, B and C and,

 * GND and pins A, B and C.
 (Ref. ASM 21-61/02).

 (a) If there is a short circuit repair the related wiring between:

 - connector (34HHA) pin A and PC 2 connector (27HHAB) pin 11D, connector (34HHA) pin B and PC 2 connector (27HHAB) pin 12B, connector (34HHA) pin C and PC 2 connector (27HHAB) pin 12A. (Ref. ASM 21-61/02).

 - connect the electrical connector (34HHA). (Ref. AMM TASK 21-61-15-400-001).

 (b) If there is no short circuit connect the electrical connector (34HHA). (Ref. AMM TASK 21-61-15-400-001).

 (4) If the fault continues:

 - disconnect the electrical connector (38HHA) (Ref. AMM TASK 21-61-17-000-001) and,

 - at the electrical connector (38HHA) do a check for a short circuit between:

 * pins A and B, A and C, B and C and,

 * GND and pins A, B and C.
 (Ref. ASM 21-61/02).

 「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, ∞∞21-61-00∞∞∞∞∞∞∞∞∞∞Page A295
 201-299, 301-399, Aug 01/05 CES

 (a) If there is a short circuit repair the related wiring between:

 - connector (38HHA) pin A and PC 2 connector (27HHAB) pin 1D,

 - connector (38HHA) pin B and PC 2 connector (27HHAB) pin 2A,

 - connector (38HHA) pin C and PC 2 connector (27HHAB) pin 2B. (Ref. ASM 21-61/02).

 - connect the electrical connector (38HHA). (Ref. AMM TASK 21-61-17-400-001).

 (b) If there is no short circuit connect the electrical connector (38HHA), (Ref. AMM TASK 21-61-17-400-001).

 - install the removed CONTROLLER-PACK 2 TEMP (27HH) (Ref. AMM TASK 21-61-34-400-001).

 - close the CBIs 21HH (W22), 22HH (Y20), 23HH (W21) and 24HH (Y21).

 5. Close-up
________
 A. Put the aircraft back to its initial configuration.
 「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, ∞∞21-61-00∞∞∞∞∞∞∞∞∞∞Page A296
 201-299, 301-399, Aug 01/05 CES

R **ON A/C 401-499,
 TASK 21-61-00-810-868
 ACSC1 / Pack 1 Bypass Valve Fault
 1. Possible Causes
_______________
 - CONT-AIR COND SYSTEM 1 (47HH)

 - VALVE-TURBINE BYPASS (10HH)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 21-61-00-710-001 Operational Test of the Pack Temperature-Control System AMM 21-61-34-000-002 Removal of the Air-Conditioning System Controller (47HH, 57HH) AMM 21-61-34-400-002 Installation of the Air-Conditioning System
 Controller (47HH, 57HH)
 AMM 21-61-53-000-001 Removal of the Bypass Valve 10HH (30HH)
 AMM 21-61-53-400-001 Installation of the Bypass Valve 10HH (30HH)
 ASM 21-61/01

 3. Fault Confirmation
__________________
 A. Do the operational test of the pack temperature-control system (Ref. AMM TASK 21-61-00-710-001).
 4. Fault Isolation
_______________
 A. If the test gives the maintenance message ACSC1(47HH)/P1 BY PASS VALVE(10HH):
　
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