ACSC2 Power Supply Fault
 1. Possible Causes
_______________
 2. Job Set-up Information______________________ Not Applicable
 3. Fault Confirmation
__________________
 A. Not applicable.
 4. Fault Isolation
_______________
 A. If the GROUND REPORT gives the maintenance message ACSC2 (57HH) / POWER SUPPLY INTERRUPT ACSC2:
 (1) Do the checks which follow:
 (a) do a check for 28VDC at:

 (b) do a check for 115VAC at: 1 For LANE A,

 1_ For LANE A,
 - ACSC2 (57HH)C pin 3.
 2_ FOR LANE B,
 - ACSC2 (57HH)C pin 2.

_
 - ACSC2 (57HH)C pin 4. 2 FOR LANE B,
_ - ACSC2 (57HH)C pin 1.
 (2) If the fault continues:
 - do the trouble shooting of the electrical power supply (Ref. TSM Chapter 24).

R **ON A/C 301-302, 401-499,
 TASK 21-61-00-810-887
 ACSC CIDS Input Fault
 1. Possible Causes
_______________
 - CONT-AIR COND SYSTEM 1 (47HH)

 - CONT-AIR COND SYSTEM 2 (57HH)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
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 23-73-00-740-010 Interface and Power-Up Test of the Cabin
 Intercommunication Data System (CIDS) via the CFDS SIL 23-039 ASM 21-63/01 ASM 21-63/03
 3. Fault Confirmation
__________________
R **ON A/C 401-499,
 A. Test
 (1) Do a read out of the POST FLIGHT REPORT and check for CLASS 2 Chapter 21 messages.

 (2) Do the CIDS Interface and Power-Up test through the CFDS (Ref. AMM TASK 23-73-00-740-010).

R  **ON A/C 301-302, 401-499,
 4. Fault Isolation_______________ 
R
 **ON A/C 301-302,
 A. If no fault message, or only the fault message 237334 DIR2 (102RH) is shown on the CFDS and this message is related to the passive director (DIR1 ACTIVE is shown on the CFDS): - the maintenance status TEMP CTL 1/2 and the CIDS-message are spurious and can be ignored (Ref. SIL 23-039). 
R  **ON A/C 401-499, 
R R R R R R R R R  A. If the POST FLIGHT REPORT gives the maintenance messages CIDS1(101RH) and CIDS2(102RH): - do a check of the wiring from: - (Ref. ASM 21-63/03) the ACSC1 (47HH/AA) pin 1D to the DIR-SIDS, 1 (101RH/AA) pin 6A, - the ACSC1 (47HH/AA) pin 1E to the DIR-SIDS, 1 (101RH/AA) pin 6B, - (Ref. ASM 21-63/01) the ACSC2 (57HH/AA) pin 1D to the DIR-SIDS, 2 (102RH/AA) pin 6A and, - the ACSC2 (57HH/AA) pin 1E to the DIR-SIDS, 2 (102RH/AA) pin 6B. 
R R R  (1) If the fault continues: Replace the CONT-AIR COND SYSTEM 1 (47HH) and the CONT-AIR COND SYSTEM 2 (57HH) (Ref. AMM TASK 21-61-34-000-002) and (Ref. AMM TASK 21-61-34-400-002).

R

 TASK 21-61-00-810-888 MCDU - NO TEST Indications
 1. Possible Causes

_______________

 2. Job Set-up Information

______________________
 Not Applicable

 3. Fault Confirmation

__________________
 A. Unable to complete temperature control test (MCDU).
 4. Fault Isolation
_______________
 A. If the temperature control test shows the MCDU indications NO TEST: PACK 1 NOT OFF and PACK 2 NOT OFF:
 (1) Where applicable disconnect or shut down the Engine, APU and/or HP bleed air supplies.
 NOTE : Presence of bleed air pressure could lead to test performance
____
 failure.

 (2) Open the circuit breakers 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH and 56HH.

 (3) Wait for a minimum of 5 seconds.

 (4) Close the circuit breakers 49HH, 50HH, 51HH, 52HH, 53HH, 54HH, 55HH and 56HH.

 (5) With the bleed air supply still disconnected or shut down restart the related temperature control test.

 TASK 21-61-00-810-889

 ACSC2/ACSC1 Bus 1 Fault
 1. Possible Causes
_______________
 - CONT-AIR COND SYSTEM 2 (57HH)

 - CONT-AIR COND SYSTEM 1 (47HH)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
　
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