___________________________________________________________
 TASK 21-26-00-810-801
 Loss of the Automatic Control and Monitoring of the Valves and Fans
 1. Possible Causes
_______________
 - AEVC (10HQ)

 - CARTRIDGE-AVNCS VENT FILTER (2082HM)

 - wiring between the AEVC pin AA/1D and the ground terminal

 - C/B-AIR COND AVNCS VENT/MONG (3HQ)

 - wiring between the AEVC pin AA/1A and the circuit breaker (3HQ)

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
R 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 21-26-43-600-002 Servicing of the Filter
 AMM 21-26-43-920-001 Replacement of the Filter Cartridge
 ASM 21-26/01
 ASM 21-26/03
 ASM 21-26/03

 3. Fault Confirmation
__________________
 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
_______________
 A. Table of the circuit breakers used in this procedure:
 -------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------
122VU AIR COND/AVNCS/VENT/MONG 3HQ Y17
 「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 201
 Feb 01/04 CESR **ON A/C 001-049, 051-099, 101-105, 301-399, 401-499,

 B. If the test gives the maintenance message NO RESPONSE:
 - make sure that the avionics ventilation filter is not clogged. If necessary, replace it (Ref. AMM TASK 21-26-43-600-002).
 (1) If the fault continues:

 - do a check of the status of the circuit breaker (3HQ).

 (2) If the circuit breaker (3HQ) is closed:

 - do a check for 28VDC at pin AA/1A 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).
 1 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).
 2 If there is no ground signal:
_
 - repair the wiring between the AEVC pin AA/1D and the ground terminal.
 (b) If there is no 28VDC:
 - do a check of the wiring between the AEVC pin AA/1A and the circuit breaker (3HQ) (Ref. ASM 21-26/03).
 1 If there is no continuity:
_ - repair the related wiring.
 2 If there is continuity:
_ - replace the C/B-AIR COND AVNCS VENT/MONG (3HQ).
 (3) If the circuit breaker is open:
 - close the circuit breaker (3HQ).
 (a) If the circuit breaker trips:
 - do a check for a short to ground at the wiring between the AEVC pin AA/1A and the circuit breaker (3HQ) (Ref. ASM 21-26/03).
 1 If there is a short to ground:
_ - repair the related wiring.
 2 If there is no short to ground:
_
 - replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001).
 a If the fault continues:
_
 - replace the circuit breaker (3HQ).
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 001-049, 051-099, 101-105, 301-399, ∞∞21-26-00∞∞∞∞∞∞∞∞∞∞Page 202
 401-499, Aug 01/05 CES

 (b) If the circuit breaker stays closed and the fault continues: - replace the AEVC (10HQ) (Ref. AMM TASK 21-26-34-000-001) and (Ref. AMM TASK 21-26-34-400-001). 
R  **ON A/C 001-049, 101-149, 151-199, 201-299, 
R  Post SB  21-1087 For A/C 001-049,101-105,
 B. If the test gives the maintenance message NO RESPONSE: - make sure that the avionics ventilation filter is not clogged. If necessary, replace the CARTRIDGE-AVNCS VENT FILTER (2082HM) (Ref. AMM TASK 21-26-43-920-001).
 **ON A/C ALL
 C. Do the operational test given in Para. 3.
　
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