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
_______________
R **ON A/C 001-049, 051-099, 101-105, 301-399, 401-499,
 A. If the test gives the maintenance message INLET BYPASS V 16HQ:
 - make sure that the avionics ventilation filter is not clogged. If necessary, replace it.

 - do a check of the status of the skin exchanger-inlet bypass valve (16HQ) microswitches, between pin A/J and pin A/G and between pin A/M and pin A/K (Ref. ASM 21-26/02).

 「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 218
 Aug 01/05 CES

 (1) If the status of the microswitches between pin A/J and pin A/G is equivalent to the status of the microswitch between pin A/M and pin A/K:

 - replace the VALVE-SKIN EXCHANGER INLET BYPASS AVNCS VENT (16HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).

 (2) If the status of the microswitches between pin A/J and pin A/G is not equivalent to the status of the microswitch between pin A/M and pin A/K:

 - do a check for a ground signal at pin A/U, pin A/G, pin A/K of the skin exchanger-inlet bypass valve (16HQ) (Ref. ASM 21-26/02).
 (a) If there is no ground signal:

 - repair the related wiring.

 (b) If there is a ground signal:

 - do a check and repair the wiring between the AEVC (10HQ) and the skin exchanger-inlet bypass valve (16HQ), pin AB/2A and pin A/J and/or pin AB/2B and pin A/M.
 1 If the fault continues:
_
 - do a check and repair the wiring between the AEVC (10HQ) and the skin exchanger-inlet bypass valve (16HQ) , pin AA/2A and pin A/A and/or pin AA/2B and pin A/C (Ref. ASM 21-26/02).
 a If the fault continues:
_
 - replace the VALVE-SKIN EXCHANGER INLET BYPASS AVNCS VENT (16HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001). . 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).
R **ON A/C 001-049, 101-149, 151-199, 201-299,
R Post SB 21-1087 For A/C 001-049,101-105,
 A. If the test gives the maintenance message INLET BYPASS V 16HQ:
 - 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).

 - do a check of the status of the skin exchanger-inlet bypass valve (16HQ) microswitches, between pin A/J and pin A/G and between pin A/M and pin A/K (Ref. ASM 21-26/02).

 (1) If the status of the microswitches between pin A/J and pin A/G is equivalent to the status of the microswitch between pin A/M and pin A/K:
 - replace the VALVE-SKIN EXCHANGER INLET BYPASS AVNCS VENT (16HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001).
 「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 219
 May 01/05 CES

 (2) If the status of the microswitches between pin A/J and pin A/G is not equivalent to the status of the microswitch between pin A/M and pin A/K:
 - do a check for a ground signal at pin A/U, pin A/G, pin A/K of the skin exchanger-inlet bypass valve (16HQ) (Ref. ASM 21-26/02).
 (a) If there is no ground signal:

 - repair the related wiring.

 (b) If there is a ground signal:

 - do a check and repair the wiring between the AEVC (10HQ) and the skin exchanger-inlet bypass valve (16HQ), pin AB/2A and pin A/J and/or pin AB/2B and pin A/M.
 1_ If the fault continues:
 - do a check and repair the wiring between the AEVC (10HQ) and
 the skin exchanger-inlet bypass valve (16HQ), pin AA/2A and
 pin A/A and/or pin AA/2B and pin A/C (Ref. ASM 21-26/02).

 a If the fault continues:
_
 - replace the VALVE-SKIN EXCHANGER INLET BYPASS AVNCS VENT (16HQ) (Ref. AMM TASK 21-26-55-000-001) and (Ref. AMM TASK 21-26-55-400-001). . 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).
 **ON A/C ALL
 B. Do the operational test given in Para. 3.
　
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