R . If there is no continuity:
R * repair the related wiring.
R
R . If there is continuity:
R * replace the circuit breaker C/B-AIR COND AVNCS VENT/CTL
R (6HQ).
R
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R . If the fault continues:
R * replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-
R 001) and (Ref. AMM TASK 21-26-34-400-001).
R 2_ If there is no 28VDC at pin AA/2C:
R - do a check for 28VDC at pin A/D3 of the VENTILATION/EXTRACT
R pushbutton switch (14HQ) (Ref. ASM 21-26/02).
R a_ If there is 28VDC:
R - replace the P/BSW-VENTILATION/EXTRACT (14HQ).
R b_ If there is no 28VDC:
R - do a check of the wiring between the AEVC (10HQ) pin
R AA/2C and the pushbutton switch (14HQ) pin A/D1 and
R wiring between the pushbutton switch (14HQ) pin A/D3 and
R the circuit breaker (6HQ).
R . If there is no continuity:
R * repair the related wiring.
R . If there is continuity:
R * replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-R 001) and (Ref. AMM TASK 21-26-34-400-001).
R
R . If the fault continues:
R * replace the circuit breaker C/B-AIR COND AVNCS VENT/CTL
R (6HQ).
R 3_ If there is no 28VDC at pin AA/3D:
R - do a check for 28VDC at pin A/C3 of the VENTILATION/BLOWER
R pushbutton switch (13HQ) (Ref. ASM 21-26/02).
R a_ If there is 28VDC:
R - replace the P/BSW-VENTILATION/BLOWER (13HQ).
R b_ If there is no 28VDC:
R - do a check of the wiring between the AEVC (10HQ) pin
R AA/3D and the pushbutton switch (13HQ) pin A /C1 and
R wiring between the pushbutton switch (13HQ) pin A/C3 and
R the pushbutton switch (14HQ) pin A/C2 and wiring between
R the AEVC (10HQ) pin AA/3D and the pushbutton switch
R (14HQ) pin A/C1.
R . If there is no continuity: R * repair the related wiring.
R . If there is continuity: R * do a check for 28VDC at pin A/C3 of the R VENTILATION/EXTRACT pushbutton switch (14HQ) (Ref. ASM
21-26/02). R If there is 28VDC: R replace the P/BSW-VENTILATION/EXTRACT (14HQ). R If there is no 28VDC: R ** do a check of the wiring between the pushbutton switch R (14HQ) pin A/C3 and the pushbutton switch (13HL) pin R A/C2.
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R If there is no continuity:
R repair the related wiring.
R If there is continuity:
R *** do a check for 28VDC at pin A/C3 of the CABIN
R PRESS/DITCHING pushbutton switch (13HL) (Ref. ASM 21-
26/02).
R If there is 28VDC:
R replace the P/BSW-CABIN PRESS/DITCHING (13HL).
R If there is no 28VDC:
R **** do a check of the wiring between the pushbutton
R switch (13HL) pin A/C3 and the circuit breaker (6HQ).
R If there is no continuity:
R repair the related wiring.
R If there is continuity:
R replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001)
R and (Ref. AMM TASK 21-26-34-400-001).
R ***** If the fault continues:
R replace the C/B-AIR COND AVNCS VENT/CTL (6HQ).
C. Do the operational test given in Para. 3.
TASK 21-26-00-810-803
Failure of the Skin Air-Inlet Valve
1. Possible Causes
_______________
- AEVC (10HQ)
- CARTRIDGE-AVNCS VENT FILTER (2082HM)
- wiring between the AEVC (10HQ) and the skin air-inlet valve (15HQ)
- VALVE-SKIN AIR INLET, AVNCS VENT (15HQ)
2. Job Set-up Information
______________________
A. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
AMM 21-26-00-710-001 Operational Check of System via MCDU AMM 21-26-34-000-001 Removal of the Avionics Equipment Ventilation Computer (AEVC) (10HQ) AMM 21-26-34-400-001 Installation of the Avionics Equipment Ventilation
Computer (AEVC) (10HQ) AMM 21-26-43-920-001 Replacement of the Filter Cartridge AMM 21-26-52-000-001 Removal of the Avionics Ventilation Skin Air Inlet
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