TASK 21-26-00-810-802

 Loss of Power Supply of the Valves and Fans
 1. Possible Causes
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 - AEVC (10HQ) R - wiring between the AEVC pin AA/1D and the ground terminal
 - C/B-AIR COND AVNCS VENT/CTL (6HQ)

 - wiring between the AEVC pin AA/1C and the circuit breaker (6HQ)

 - P/BSW-VENTILATION/BLOWER (13HQ)

 - wiring between the AEVC (10HQ) pin AA/7C and the pushbutton switch (13HQ)

 pin A D1 R - wiring between the pushbutton switch (13HQ) pin A/D3 and the circuit R breaker (5HQ)
 - C/B-AIR COND AVNCS VENT/CTL (5HQ)

 - wiring between the AEVC pin AA/1B and the circuit breaker (5HQ)

 - the wiring between the AEVC pin AA/7C and the circuit breaker (5HQ) R - P/BSW-VENTILATION/EXTRACT (14HQ) R - wiring between the AEVC (10HQ) pin AA/2C and the pushbutton switch (14HQ) R pin A/D1 R - wiring between the pushbutton switch (14HQ) pin A/D3 and the circuit R breaker (6HQ) R - wiring between the AEVC (10HQ) pin AA/3D and the pushbutton switch (13HQ) R pin A /C1 R - wiring between the pushbutton switch (13HQ) pin A/C3 and the pushbutton R switch (14HQ) pin A/C2 R - wiring between the AEVC (10HQ) pin AA/3D and the pushbutton switch (14HQ) R pin A/C1 R - wiring between the pushbutton switch (14HQ) pin A/C3 and the pushbutton R switch (13HL) pin A/C2 R - P/BSW-CABIN PRESS/DITCHING (13HL) R - wiring between the pushbutton switch (13HL) pin A/C3 and the circuit R breaker (6HQ)
 2. Job Set-up Information
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 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)
 ASM 21-26/01
 ASM 21-26/02

R  ASM 21-26/02 ASM 21-26/03
 「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 204
 May 01/05 CES

 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).
 4. Fault Isolation
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 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------49VU AIR COND/AVNCS VENT/CTL 6HQ D06 49VU AIR COND/AVNCS VENT/CTL 5HQ D05
 B. If the test gives the maintenance message CHECK AEVC SUPPLY:
 - do a check of the status of the circuit breaker (5HQ).
 (1) If the circuit breaker (5HQ) is closed:
 - do a check for 28VDC at pin AA/7C and/or pin AA/1B of the AEVC (10HQ) (Ref. ASM 21-26/03) and (Ref. ASM 21-26/02)
 (a) If there is 28VDC at pins AA/7C and/or AA/1B:
 - do a check of the status of the circuit breaker (6HQ).
 1 If the circuit breaker (6HQ) is closed:
_
 - do a check for 28VDC at pin AA/1C of the AEVC (10HQ) (Ref. ASM 21-26/03)
 a If there is 28VDC:
_
 - do a check for a ground signal at pin AA/1D of the AEVC (10HQ) (Ref. ASM 21-26/01).
 . If there is a ground signal:
 * replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).
 . If there is no ground signal: R * repair the wiring between the AEVC pin AA/1D and the R ground terminal.
 b If there is no 28VDC:
_
 - do a check of the wiring between the AEVC pin AA/1C and R the circuit breaker (6HQ) (Ref. ASM 21-26/03).
 . If there is no continuity:
 * repair the related wiring.
 . If there is continuity:
 「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 205
 May 01/05 CES

 * replace the circuit breaker C/B-AIR COND AVNCS VENT/CTL (6HQ).

 . If the fault continues:

 * replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).

 2 If the circuit breaker (6HQ) is open:
_ - close the circuit breaker (6HQ).
 a If the circuit breaker trips:
　
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