TASK 21-51-00-810-802
 Mixer Flap Actuator Fault
 1. Possible Causes_______________
R R R  - ACTUATOR-MIXER FLAP (20HB) - CONT-ZONE TEMPERATURE (8HK) - P/BSW-AIR COND/PACK 1 (7HB) - P/BSW-AIR COND/PACK 2 (6HB) - CONT-AIR COND SYSTEM 2 (57HH) - RELAY-BACK-UP FLAP (4HB) - RELAY-BACK-UP FLAP DISAGREE (21HB) - PUSHBUTTON SWITCH-AIR COND/PACK 1 (7HB) - PUSHBUTTON SWITCH-AIR COND/PACK 2 (6HB) - wiring
 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
R R R R  AMM AMM AMM AMM AMM AMM AMM ASM ASM  21-51-52-000-001 21-51-52-400-001 21-61-00-710-001 21-61-34-000-002 21-61-34-400-002 21-63-34-000-001 21-63-34-400-001 21-51/0221-51/02 Removal of the Mixer Flap Actuator 20HBInstallation of the Mixer Flap Actuator 20HBOperational Test of the Pack Temperature-Control System Removal of the Air-Conditioning System Controller (47HH, 57HH) Installation of the Air-Conditioning System Controller (47HH, 57HH)Removal of the Zone Controller (8HK)Installation of the Zone Controller (8HK)
 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
_______________
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
 A. If the test gives the maintenance message MIXER FLAP DRIVE OR SPLY:
 - replace the ACTUATOR-MIXER FLAP (20HB) (Ref. AMM TASK 21-51-52-000-001) (Ref. AMM TASK 21-51-52-400-001).
 (1) If the fault continues:

 - do a check of the RELAY-BACK-UP FLAP (4HB) and replace it if necessary (Ref. ASM 21-51/02).

 (2) If the fault continues:

 - do a check of the RELAY-BACK-UP FLAP DISAGREE (21HB) and replace it if necessary (Ref. ASM 21-51/02).

 (3) If the fault continues:

 - do a check of the PUSHBUTTON SWITCH-AIR COND/PACK 1 (7HB) and replace it if necessary (Ref. ASM 21-51/02).

 (4) If the fault continues:

 - do a check of the PUSHBUTTON SWITCH-AIR COND/PACK 2 (6HB) and replace it if necessary (Ref. ASM 21-51/02).

 (5) If the fault continues:

 - replace the CONT-ZONE TEMPERATURE (8HK) (Ref. AMM TASK 21-63-34-000-001) and (Ref. AMM TASK 21-63-34-400-001):

 (6) If the fault continues:

 - do a check and repair the wiring (Ref. ASM 21-51/02) from:

 - the ACTUATOR (20HB) to the RELAY (4HB),

 - the ACTUATOR (20HB) to ground,

 - the RELAY (4HB) to the CB (3HB) and,

 - the RELAY (4HB) to ground.

R **ON A/C 401-499,
 A. If the test gives the maintenance message MIXER FLAP DRIVE OR SPLY(20HB):
 - replace the ACTUATOR-MIXER FLAP (20HB) (Ref. AMM TASK 21-51-52-000-001) (Ref. AMM TASK 21-51-52-400-001).
 (1) If the fault continues:

 - do a check of the P/BSW-AIR COND/PACK 1 (7HB) and replace it if necessary (Ref. ASM 21-51/02).

 (2) If the fault continues:

 - do a check of the P/BSW-AIR COND/PACK 2 (6HB) and replace it if necessary (Ref. ASM 21-51/02).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1 EFF : ALL ∞∞21-51-00∞∞∞∞∞∞∞∞∞∞Page 206
 Aug 01/05 CES

R  (3) If the fault continues: 
R  - replace the CONT-AIR COND SYSTEM 2 (57HH) (Ref. AMM TASK 21-61-34-
R  000-002) and (Ref. AMM TASK 21-61-34-400-002): 
R  (4) If the fault continues: 
R  - do a check and repair the wiring (Ref. ASM 21-51/02) from: 
R  - the ACTUATOR (20HB) to the ACSC2 (57HH) and, 
R  - the ACTUATOR (20HB) to ground. 
R  **ON A/C ALL
 B. Do the test as given in the Para. 3.A.
 5. Close-up________
 A. Put the aircraft back to its initial configuration.

 TASK 21-51-00-810-803

 Pack 1 Flow Control Valve (Pack 1 Flow Control Unit) Fault
 1. Possible Causes
_______________
 - VALVE-FLOW CTL (11HB)

 - BOARD-ANN LT TEST & INTFC (8LP)

 - CONTROLLER-PACK 1 TEMP (7HH) R - CONT-AIR COND SYSTEM 1 (47HH)

 - Flow-Control Valve Filter R - P1 FLOW CTL SYSTEM (23HB)

 - RELAY-L PACK CLOSE (13HB)

 - RELAY-L FCV DISAGREE (15HB)

 - PUSHBUTTON SWITCH-AIR COND/PACK 1 (7HB)

 - RELAY-ENGINE 1 START (17HB)

 - RELAY-RAM AIR CLOSE CTL (3HZ)
　
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