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

 「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 208
 May 01/05 CES

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.
 「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 209
 May 01/05 CES

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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