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REFERENCE DESIGNATION
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AMM 21-26-51-000-001 Removal of the Blower and Extract Fans (18HQ,20HQ) AMM 21-26-51-400-001 Installation of the Blower and Extract Fans (18HQ, 20HQ) AMM 21-26-52-000-001 Removal of the Avionics Ventilation Skin Air Inlet Valve (15HQ) AMM 21-26-52-400-001 Installation of the Avionics Ventilation Skin Air Inlet Valve (15HQ) AMM 21-26-55-000-001 Removal of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve (16HQ) AMM 21-26-55-400-001 Installation of the Avionics Ventilation Skin Exchanger Inlet Bypass Valve (16HQ) ASM 21-26/03
3. Fault Confirmation
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A. Test
(1) Do the operational test of the avionics equipment ventilation from the Multipurpose Control and Display Unit (MCDU) (Ref. AMM TASK 21-26-00-710-001).
(2) Read the LAST LEG REPORT (Ref. AMM TASK 21-26-00-710-009).
(3) Read the CLASS 3 message (Ref. AMM TASK 21-26-00-710-008).
4. Fault Isolation
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A. Table of the circuit breakers used in this procedure:
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------122VU AIR COND/AVNCS/VENT/MONG 3HQ Y17 123VU AVNCS VENT/BLOWER/FAN 1HQ AD10
R **ON A/C 001-049, 051-099, 101-105, 301-399, 401-499,
B. Possible Maintenance Messages (one or more of these messages)
SKIN AIR INLET V 15HQ
ISOL V 24HQ
BLOWER FAN 20HQ
PRESSURE SWITCH 17HQ
PRESSURE SWITCH 19HQ
DUCT TEMP SENSOR 26HQ
「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 ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 224
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(1) If the test gives the maintenance message SKIN AIR INLET V 15HQ, replace the VALVE-SKIN AIR INLET, AVNCS VENT (15HQ) (Ref. AMM TASK 21-26-52-000-001) and (Ref. AMM TASK 21-26-52-400-001).
(2) If the test gives the maintenance message ISOL V 24HQ, replace the VALVE-SKIN EXCHANGER ISOLATION, AVNCS VENT (24HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).
(3) If the test gives the maintenance message DUCT TEMP SENSOR 26HQ, replace the SENSOR-DUCT TEMP, AVNCS VENT (26HQ) (Ref. TASK 21-26-00-810-818).
(4) If the test gives the maintenance message BLOWER FAN 20HQ:
- make sure that the avionics ventilation filter is not clogged. If necessary, replace it (Ref. AMM TASK 21-26-43-600-001).
- do a check of the status of the circuit breaker (1HQ).
(5) If the test also gives the maintenance message PRESSURE SW 19HQ and/or PRESSURE SW 17HQ:
- do the procedures (Ref. TASK 21-26-00-810-814) and (Ref. TASK 21-26-00-810-815).
(6) If the circuit breaker (1HQ) is closed:
- do a check for 115VAC at pins A/J, A/K, A/L of the blower fan (20HQ).
(a) If there is no 115VAC:
- do a check for 115VAC at pins T1, T2, T3 of the blower fan control-contactor (8HQ).
1 If there is no 115VAC:
_
- do a check for a short to ground at the wiring between the blower fan control-contactor (8HQ) and the circuit breaker (1HQ), pins L1, L2, L3 and respectively pins A2, B2, C2 (Ref. ASM 21-26/03).
a If there is a short to ground:
_ - repair the related wiring.
b If there is no short to ground:
_
- replace the C/B-AVNCS BLOWER FAN (1HQ)
2 If there is 115VAC:
_
- do a check of the status of the circuit breaker (3HQ).
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