A320 Trouble Shooting Manual 排故手册 机载辅助动力 1(54)

 「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 : 001-003, 051-099, 401-499, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page A250
 Config-1 Aug 01/05 CES

 D. If: .there is no or low bleed pressure, .the APU self test gives no maintenance message, .the EGT rises and the BLEED (PSI) pressure is low on the APU system page.
 NOTE : Aircraft configuration:
____

 - the PACK 1 and 2 p/bsw are off,

 - the APU BLEED valve p/bsw is ON.

 - Review LRU faults in the last and previous leg reports and replace failed LRU's

 - check the load control valve position during the APU operation.

 (1) If the Bleed flow sensor assembly failed:

 - remove and replace the Bleed flow sensor assembly (Ref. AMM TASK 49-51-14-000-001) and (Ref. AMM TASK 49-51-14-400-001)

 (2) If the Surge Control Valve failed:

 - remove and replace the surge control valve (Ref. AMM TASK 49-51-52-000-002) and (Ref. AMM TASK 49-51-52-400-002)

 (3) If the load control valve is not fully open:

 - replace the LOAD CONTROL VALVE (8050KM) (Ref. AMM TASK 49-51-51-000-001) and (Ref. AMM TASK 49-51-51-400-001).

 (4) If the load control valve is fully open:

 - remove the IGV ACTUATOR (8014KM) (Ref. AMM TASK 49-23-51-000-002).

 - do a push/pull test on the IGVs to check the IGV movement. .make sure that the IGV has a travel range of 1 in. (25.3999 mm), .measure the force of the IGV movement.

 (a) If a force less than 30 lbf (13.3446 daN) is necessary to move the IGVs:

 - replace the IGV ACTUATOR (8014KM) (Ref. AMM TASK 49-23-51-000-002) and (Ref. AMM TASK 49-23-51-400-002).

 (b) If a force more than 30 lbf (13.3446 daN) is necessary to move the IGVs or the movement is less than 1 in. (25.3999 mm):

 - replace the APU (4005KM) (Ref. AMM TASK 49-11-11-000-001) and (Ref. AMM TASK 49-11-11-400-001).

 (5) If the fault continues:

 - check the APU bleed system for leaks.

 (6) If the fault continue:

 - Do a test of the A/C bleed system for air leaks.

 (7) If the fault continue:

 - remove and replace the ECB (Ref. AMM TASK 49-61-34-000-001) and (Ref. AMM TASK 49-61-34-400-001)
 「一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一一1R EFF : 063-099, 401-499, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page A251
 Config-1 Aug 01/05 CES

R **ON A/C 001-003, 051-099, 401-499,

 E. If: .the bleed pressure is normal on one pack but is low with the other pack in operation, .the APU self test gives no maintenance message.
 NOTE : Aircraft configuration:
____

 - the PACK 1 or 2 p/bsw is on,

 - the APU BLEED valve p/bsw is ON.

 NOTE : If one pack is operating, the external temperature and the cabin
____ temperature are high, APU bleed-pressure fluctuation occurs when you start the second pack to decrease the cabin temperature. This bleed pressure fluctuation is a normal effect after the start of the two pack operation in maximum cooling mode until the cabin temperature has decreased sufficiently after some time.
 - isolate left or right,
 (1) If the left side is isolated:

 - do a leak check of the left pack and the related bleed ducts.

 (2) If the right side is isolated:

 - replace the X-BLEED VALVE (6HV) (Ref. AMM TASK 36-12-52-000-001) and (Ref. AMM TASK 36-12-52-400-001).
 (a) If the fault continues:
 - do a leak check of the right pack and the related bleed ducts.

 (3) If the fault continues:

 - Performe MES dry motoring test, if the bleed is low remove and replace the Surge Control Valve (Ref. AMM TASK 49-51-52-000-002) and (Ref. AMM TASK 49-51-52-400-002).

 (4) If the bleed is still low:

 - remove and replace the Blee Flow Sensor Assembly (Ref. AMM TASK 49-51-14-000-001) and (Ref. AMM TASK 49-51-14-400-001)

 (5) If the bleed pressure is normal and the ECS 2 pack is low:

 - Do a visuall check of the LCV position, is the LCV not full open remove and replace the Load control valve (Ref. AMM TASK 49-51-51-000-001) and (Ref. AMM TASK 49-51-51-400-001).

 **ON A/C 001-003, 051-062,

 F. If:
 .the bleed pressure is low with both packs in operation,
 .the APU self test gives no maintenance message.

 NOTE : Aircraft configuration:
____

 - the PACK 1 and 2 p/bsw are on,

 - the APU BLEED valve p/bsw is ON.