(1) Not Applicable
 1 -EFF : ALL

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 --Feb 01/05 ---CES -

 4. Fault Isolation
_______________

R **ON A/C 001-049, 051-099, 101-105, 151-199, 201-228, 301-302,
 A. If the fault symptom is identified by the maintenance message: FAN AIR V 9HA2 or THRM 7170HM2 or SENSE LINE
 -do a check of the unions and clamps of the sense line between the fan air valve control thermostat and the fan air valve.
 (1)
 If the unions are loose:

 -tighten them.

 (2)
 If the unions are correctly tightened:

 -do a check of the filter of the fan air valve control thermostat (7170HM2).
 (a)
 If the filter is clogged:

 -clean (Ref. AMM TASK 36-11-43-100-001) or replace (Ref. AMM TASK 36-11-43-000-003) and (Ref. AMM TASK 36-11-43-400-003) the filter of the thermostat (7170HM2) as necessary.

 (b)
 If the filter is not clogged:

 -replace the THERMOSTAT-FAN AIR VALVE CTL (7170HM2) (Ref. AMM TASK 36-11-43-000-001) and (Ref. AMM TASK 36-11-43-400-001).
 -disconnect the sense line from the fan air valve control thermostat (7170HM2) and put a blanking cap on the sense line
 -do a check of the opening of the fan air-valve. Slowly apply 20 psi (1.3789 bar) at its test port (Ref. AMM TASK 36-11-54-720-001). The visual indicator must show that the fan air valve is fully open.
 1 If the fan air valve opens fully:
_
 -replace the THERMOSTAT-FAN AIR VALVE CTL (7170HM2) (Ref. AMM TASK 36-11-43-000-001) and (Ref. AMM TASK 36-11-43-400-001).
 2 If the fan air valve does not open fully:
_
 -connect the sense line to the fan air valve control thermostat (7170HM2)
 -disconnect the sense line union from the fan air valve (9HA2) and put a blanking cap on the union of the fan air valve
 -do a check of the opening of the fan air valve. Slowly apply 20 psi (1.3789 bar) at its test port (Ref. AMM TASK 36-11-54-720-001).
 a If the fan air valve does not open:
_
 -replace the VALVE-FAN AIR, ENG2 (9HA2) (Ref. AMM TASK 36-11-54-000-001) and (Ref. AMM TASK 36-11-54-400-001).
 b If the fan air valve opens:
_
 -do a leakage check of the sense line.
 1 -EFF : ALL

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 --May 01/05 ---CES -

 * If the fault continues:
 * - replace the SENSOR-EXCHANGER OUT TEMP, ENG 2 (6HA2)
 (Ref. AMM TASK 36-11-17-000-001) and (Ref. AMM TASK 36-11-17-400-001).

R **ON A/C 106-149, 229-299, 303-399, 401-499,
 A. If the fault symptom is identified by the maintenance message: THRM 7170HM2 OR FAN AIR VALVE 9HA2 OR SENSE LINE
 -do a check of the unions and clamps of the sense line between the fan air valve control thermostat and the fan air valve.
 (1)
 If the unions are loose:

 -tighten them.

 (2)
 If the unions are correctly tightened:

 -do a check of the filter of the fan air valve control thermostat (7170HM2).
 (a)
 If the filter is clogged:

 -clean (Ref. AMM TASK 36-11-43-100-001) or replace (Ref. AMM TASK 36-11-43-000-003) and (Ref. AMM TASK 36-11-43-400-003) the filter of the thermostat (7170HM2) as necessary.

 (b)
 If the filter is not clogged:

 -replace the THERMOSTAT-FAN AIR VALVE CTL (7170HM2) (Ref. AMM TASK 36-11-43-000-001) and (Ref. AMM TASK 36-11-43-400-001)
 -disconnect the sense line from the fan air valve control thermostat (7170HM2) and put a blanking cap on the sense line
 -do a check of the opening of the fan air-valve. Slowly apply 20 psi (1.3789 bar) at its test port (Ref. AMM TASK 36-11-54-720-001). The visual indicator must show that the fan air valve is fully open.
 1 If the fan air valve opens fully:
_
 -replace the THERMOSTAT-FAN AIR VALVE CTL (7170HM2) (Ref. AMM TASK 36-11-43-000-001) and (Ref. AMM TASK 36-11-43-400-001).
 2 If the fan air valve does not open fully:
_
 -connect the sense line to the fan air valve control thermostat (7170HM2)
 -disconnect the sense line union from the fan air valve (9HA2) and put a blanking cap on the union of the fan air valve
 -do a check of the opening of the fan air valve. Slowly apply 20 psi (1.3789 bar) at its test port (Ref. AMM TASK 36-11-54-720-001).
 a If the fan air valve does not open:
_
 -replace the VALVE-FAN AIR, ENG2 (9HA2) (Ref. AMM TASK 36-11-54-000-001) and (Ref. AMM TASK 36-11-54-400-001).
　
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