- PUSHBUTTON SWITCH-VENTILATION/CAB FANS (4HG)

 - RELAY-FAN FAULT SUPPRESSION (16HG)

 - RELAY-L FAN POWER (5HG)

 - RELAY-R FAN POWER (6HG)

 - RELAY-L FAN CTL (7HG)

 - RELAY-R FAN CTL (8HG)

 - RELAY-L FAN FAULT (10HG)

 - RELAY-R FAN FAULT (9HG)

 - wiring

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 21-21-00-710-001 Operational Test of the Cabin Recirculation Fans 14HG
 and 15HG. AMM 21-21-41-000-001 Removal of the Recirculation Filter 4012HM (4013HM) AMM 21-21-41-400-001 Installation of the Recirculation Filter 4012HM
 (4013HM) AMM 21-21-43-000-001 Removal of the Mixer Unit AMM 21-21-43-400-002 Installation of the Mixer Unit AMM 21-21-51-000-001 Removal of the Cabin Recirculation Fans 15HG and 14HG AMM 21-21-51-400-001 Installation of the Cabin Recirculation Fans 15HG and
 14HG AMM 25-55-12-000-001 Removal of the AFT Cargo Compartment Partition FR65 ASM 21-21/01 ASM 21-63/01
 「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 ∞∞21-21-00∞∞∞∞∞∞∞∞∞∞Page 205
 Feb 01/05 CES

 3. Fault Confirmation
__________________

 A. Do the operational test of the cabin recirculation fans 14HG and 15HG (Ref. AMM TASK 21-21-00-710-001).
 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 RECIRC FAN 1 AND 2 OR SPLY:
 - remove the access panels 131PW, 131NW and 132PW (Ref. AMM TASK 25-55-12-000-001),

 - visually inspect the mixer unit ducts for damage (pay special attention to the lateral seams of the ducts).

 (1) If you find damage then you must replace the mixer unit (Ref. AMM TASK 21-21-43-000-001) and (Ref. AMM TASK 21-21-43-400-002).

 (2) If there is no damage,

 - make sure that the recirculation filter (4012HM, 4013HM) housings and the adjacent areas are clean,

 - remove the FILTER-RECIRCULATION (4012HM) (Ref. AMM TASK 21-21-41-000-001),

 - remove the FILTER-RECIRCULATION (4013HM) (Ref. AMM TASK 21-21-41-000-001).

 (3) If the recirculation fans (14HG, 15HG) operate correctly:

 - do a check of the recirculation filters (4012HM, 4013HM) for contamination.
 (a) If the filters are clogged:

 - replace the FILTER-RECIRCULATION (4012HM) (Ref. AMM TASK 21-21-41-000-001) and (Ref. AMM TASK 21-21-41-400-001),

 - replace the FILTER-RECIRCULATION (4013HM) (Ref. AMM TASK 21-21-41-000-001) and (Ref. AMM TASK 21-21-41-400-001).

 (b) If the filters are not clogged:

 - install the FILTER-RECIRCULATION (4012HM) (Ref. AMM TASK 21-21-41-400-001).

 - install the FILTER-RECIRCULATION (4013HM) (Ref. AMM TASK 21-21-41-400-001).

 (4) If the recirculation fans (14HG, 15HG) do not operate:

 - do a check of the PUSHBUTTON SWITCH-VENTILATION/CAB FANS (4HG) and replace it if necessary (Ref. ASM 21-21/01).
 (a) If the fault continues:

 - do a check of the RELAY-FAN FAULT SUPPRESSION (16HG) and replace it if necessary (Ref. ASM 21-21/01).

 (b) If the fault continues:

 - do a check of the RELAY-L FAN POWER (5HG) and replace it if necessary (Ref. ASM 21-21/01),

 - do a check of the RELAY-R FAN POWER (6HG) and replace it if necessary (Ref. ASM 21-21/01).

 (c) If the fault continues:

 - do a check of the RELAY-L FAN CTL (7HG) and replace it if necessary (Ref. ASM 21-21/01),

 - do a check of the RELAY-R FAN CTL (8HG) and replace it if necessary (Ref. ASM 21-21/01).

 (d) If the fault continues:

 - do a check of the RELAY-L FAN FAULT (10HG) and replace it if necessary (Ref. ASM 21-21/01).

 - do a check of the RELAY-R FAN FAULT (9HG) and replace it if necessary (Ref. ASM 21-21/01).

 (e) If the fault continues:

 - replace the FAN RECIRCULATION (15HG) (referred to as FAN (15HG)) (Ref. AMM TASK 21-21-51-000-001) and (Ref. AMM TASK 21-21-51-400-001),

 - replace the FAN-RECIRCULATION (14HG) (referred to as FAN (14HG)) (Ref. AMM TASK 21-21-51-000-001) and (Ref. AMM TASK 21-21-51-400-001).

 (f) If the fault continues:

 - do a check and repair the wiring (Ref. ASM 21-21/01) and (Ref. ASM 21-63/01) between the: FAN (15HG) connector A/A and CB (1HG), FAN (15HG) connector A/B and CB (1HG), FAN (15HG) connector A/C and CB (1HG), FAN (15HG) connector A/E and CB (2HG), FAN (15HG) connector A/F and GND, FAN (15HG) connector A/D and GND, FAN (14HG) connector A/A and CB (3HG), FAN (14HG) connector A/B and CB (3HG), FAN (14HG) connector A/C and CB (3HG), FAN (14HG) connector A/E and CB (11HG), FAN (14HG) connector A/F and GND, FAN (14HG) connector A/D and GND, RELAY (7HG) connector A/X1 and RELAY (5HG) connector A/X1, RELAY (7HG) connector A/X2 and GND, RELAY (10HG) connector A/Z and RELAY (5HG) connector A/C1, RELAY (10HG) connector A/X and GND, RELAY (10HG) connector A/1 and ZC (8HK) connector AB/1E, RELAY (10HG) connector A/A and GND, RELAY (16HG) connector A/X and SW (4HG) connector A/C2, RELAY (16HG) connector A/Z and GND, RELAY (8HG) connector A/X1 and RELAY (6HG) connector A/X1, RELAY (8HG) connector A/X2 and GND, RELAY (9HG) connector A/X and RELAY (6HG) connector A/C1,
　
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