(1) Not Applicable
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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.
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* 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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