1. Possible Causes
_______________
 -VALVE-OVERPRESSURE, ENG 2 (5HA2)
 -
wiring from the overpressure valve to the BMC2

 -
wiring between pin A/2 of the overpressure valve and the ground terminal

 2. Job Set-up Information
______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE DESIGNATION
 -------------------------------------------------------------------------------
AMM 36-11-53-000-001 Removal of the Overpressure Valve (5HA1,5HA2) AMM 36-11-53-400-001 Installation of the Overpressure Valve (5HA1,5HA2) ASM 36-11/02
 3. Fault Confirmation
__________________
 A. Not applicable.
 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 OVERPRESS-V 5HA2 , if the overpressure valve is blocked in the open position and if the bleed pressure indication is more than 80 psig:
 -replace the VALVE-OVERPRESSURE, ENG 2 (5HA2) (Ref. AMM TASK 36-11-53-000-001) and (Ref. AMM TASK 36-11-53-400-001).
 (1)
 If the fault continues:

 -do a check and repair the wiring from the overpressure valve to the BMC2, pin A/1 to pin AA/10A (Ref. ASM 36-11/02).

 (2)
 If the fault continues:

 -do a check and repair the wiring between pin A/2 of the overpressure valve and the ground terminal.
 1 -EFF : ALL

-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page 297
 --May 01/05 ---CES -R **ON A/C 106-149, 229-299, 303-399, 401-499,

 A. If the fault symptom is identified by the maintenance message OVPRESS-V-5HA2, if the overpressure valve is blocked in the open position and if the bleed pressure indication is more than 80 psig:
 -replace the VALVE-OVERPRESSURE, ENG 2 (5HA2) (Ref. AMM TASK 36-11-53-000-001) and (Ref. AMM TASK 36-11-53-400-001).
 (1)
 If the fault continues:

 -do a check and repair the wiring from the overpressure valve to the BMC2, pin A/1 to pin AA/10A (Ref. ASM 36-11/02).

 (2)
 If the fault continues:

 -do a check and repair the wiring between pin A/2 of the overpressure valve and the ground terminal.
 **ON A/C ALL
 B. After the subsequent flight, make sure that the fault does not continue.
 1 -EFF : ALL

-∞∞36-11-00∞∞∞∞∞∞∞∞∞∞Page 298
 --Aug 01/05 ---CES - Fan Air Valve of the Engine 1 Blocked in the Open Position

 1. Possible Causes_______________
 -VALVE-FAN AIR, ENG1 (9HA1)
 -BMC-1 (1HA1)
 -THERMOSTAT-FAN AIR VALVE CTL (7170HM1)
 -
wiring from the fan air valve (9HA1) to the BMC1 (1HA1)

 -
wiring between pin A/3 of the fan air valve and the ground terminal

 2. Job Set-up Information______________________
 A. Referenced Information
 -------------------------------------------------------------------------------
REFERENCE  DESIGNATION
 -------------------------------------------------------------------------------
AMM 36-11-34-000-001  Removal of the BMC (1HA1, 1HA2)
 AMM 36-11-34-400-001  Installation of the BMC (1HA1, 1HA2)
 AMM 36-11-43-000-001  Removal of the Fan Air Valve Control Thermostat (7170HM1, 7170HM2)
 AMM 36-11-43-400-001  Installation of the Fan Air Valve Control Thermostat (7170HM1, 7170HM2)
 AMM 36-11-54-000-001  Removal of the Fan Air Valve (9HA1,9HA2)
 AMM 36-11-54-400-001  Installation of the Fan Air Valve (9HA1,9HA2)
 TSM 36-11-00-810-847  Fan Air Valve of the Engine 1 Blocked in the Closed Position
 3. Fault Confirmation__________________
 A. Not applicable.
 4. Fault Isolation_______________
 A. If the fault symptom is identified by the maintenance message FAN AIR V 9HA1 OR THRM 7170HM1:
 (1)
 If the temperature regulation is abnormally low (less than 180.C during climb/cruise:

 -replace the THERMOSTAT-FAN AIR VALVE CTL (7170HM1) (Ref. AMM TASK 36-11-43-000-001) and (Ref. AMM TASK 36-11-43-400-001).

 (2)
 If the fault continues:

 -do a check and repair the wiring from the fan air valve (9HA1) to the BMC1 (1HA1), pins A/1 and A/5 to pins AA/12A and AA/13A.
 (a) If the fault continues:
　
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