LAVATORY/GALLEY VENTILATION - FAULT ISOLATION PROCEDURES
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TASK 21-23-00-810-801
Galley and Lavatory Extraction Fault
1. Possible Causes
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- FAN-EXTRACTION (1HU)
- RELAY-FAN POWER (2HU)
- RELAY-FAN CONTROL (3HU)
- RELAY-FAN FAULT (4HU)
- RELAY-FAN POWER (2HU)
- RELAY-FAN CONTROL (3HU)
- RELAY-FAN FAULT (4HU)
- wiring
2. Job Set-up Information
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A. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
AMM 21-23-51-000-001 Removal of the Lavatory and Galley Extract Fan (1HU) AMM 21-23-51-400-001 Installation of the Lavatory and Galley Extract Fan (1HU) AMM 21-61-00-710-001 Operational Test of the Pack Temperature-Control
System
ASM 21-23/01
ASM 21-63/01
3. Fault Confirmation
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A. Do the operational test of the pack temperature-control system (Ref. AMM TASK 21-61-00-710-001).
4. Fault Isolation
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R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 301-399,
A. If the test gives the maintenance message GALY & TOIL FAN OR SPLY:
- replace the FAN-EXTRACTION (1HU) (referred to as FAN (1HU)) (Ref. AMM TASK 21-23-51-000-001) and (Ref. AMM TASK 21-23-51-400-001).
(1) If the fault continues:
- do a check of the RELAY-FAN POWER (2HU) and replace it if necessary (Ref. ASM 21-23/01).
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(2) If the fault continues:
- do a check of the RELAY-FAN CONTROL (3HU) and replace it if necessary (Ref. ASM 21-23/01).
(3) If the fault continues:
- do a check of the RELAY-FAN FAULT (4HU) and replace it if necessary (Ref. ASM 21-23/01).
(4) If the fault continues:
- do a check and repair the wiring between: FAN (1HU) connector A/A and CB (6HU), FAN (1HU) connector A/B and CB (6HU), FAN (1HU) connector A/C and CB (6HU), FAN (1HU) connector A/E and CB (5HU), FAN (1HU) connector A/D and GND, FAN (1HU) connector A/F and GND, RELAY (3HU) connector A/X1 and CB (5HU), RELAY (3HU) connector A/X2 and GND, RELAY (4HU) connector A/X and CB (6HU), RELAY (4HU) connector A/Z and GND, RELAY (4HU) connector A/1 and ZC (8HK) connector AB/1C, RELAY (4HU) connector A/A and GND (Ref. ASM 21-23/01) and (Ref. ASM 21-63/01).
R **ON A/C 401-499,
A. If the test gives the maintenance message GALY & TOIL FAN OR SPLY(1HU):
- replace the FAN-EXTRACTION (1HU) (Ref. AMM TASK 21-23-51-000-001) and (Ref. AMM TASK 21-23-51-400-001).
(1) If the fault continues:
- do a check of the RELAY-FAN POWER (2HU) and replace it if necessary (Ref. ASM 21-23/01).
(2) If the fault continues:
- do a check of the RELAY-FAN CONTROL (3HU) and replace it if necessary (Ref. ASM 21-23/01).
(3) If the fault continues:
- do a check of the RELAY-FAN FAULT (4HU) and replace it if necessary (Ref. ASM 21-23/01).
(4) If the fault continues:
- do a check and repair the wiring (Ref. ASM 21-23/01) and (Ref. ASM 21-63/01) from:
- the FAN (1HU) to the CB (6HU),
- the FAN (1HU) to the CB (5HU),
- the FAN (1HU) to ground,
- the RELAY (3HU) to the CB (5HU),
- the RELAY (3HU) to ground,
- the RELAY (4HU) to the CB (6HU),
「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 ∞∞21-23-00∞∞∞∞∞∞∞∞∞∞Page 202
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R R - the RELAY (4HU) to ground and, - the RELAY (4HU) to the ACSC1 (47HH).
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.
LAVATORY/GALLEY VENTILATION - TASK SUPPORTING DATA
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Lavatory/Galley Ventilation - Block Diagram
Figure 301
「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 ∞∞21-23-00∞∞∞∞∞∞∞∞∞∞Page 302
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