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.
- do a check of the APU compressor discharge pressure line and the air-flow sensor lines for leaks.
(1) If there are leaks:
- replace or tighten as necessary.
(2) If there are no leaks:
- clean the surge control valve filter (Ref. AMM TASK 49-51-52-600-001).
(a) If the fault continues:
- do a check of the load control valve position (during APU operation)
1 If the load control valve is not fully open:
_
- replace the LOAD CONTROL VALVE P12 (Ref. AMM TASK 49-51-51-000-001) and (Ref. AMM TASK 49-51-51-400-001).
2 If the load control valve is fully open:
_
- replace the PNEUMATIC SENSOR ASSY (Ref. AMM TASK 49-51-13-000-001) and (Ref. AMM TASK 49-51-13-400-001).
3 If the fault continues:
_
- replace the SURGE CONTROL VALVE P18 (Ref. AMM TASK 49-51-52-000-002) and (Ref. AMM TASK 49-51-52-400-002).
4 If the fault continues:
_
- do a check of the electrical connectors for the surge control valve and the transducers for damage.
5 If the fault continues:
_
- replace the ECB (59KD) (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 : 001-003, 051-062, ∞∞49-00-00∞∞∞∞∞∞∞∞∞∞Page A253
Config-1 Aug 01/05 CES
R **ON A/C 063-099, 401-499,
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.
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.
- do a check of the APU compressor discharge pressure line and the air-flow sensor lines for leaks.
(1) If there are leaks:
- replace or tighten as necessary.
(2) If there are no leaks:
- clean the surge control valve filter (Ref. AMM TASK 49-51-52-600-001).
(a) If the fault continues:
- do a check of the load control valve position (during APU operation)
1 If the load control valve is not fully open:
_
- replace the LOAD CONTROL VALVE (8051KM) (Ref. AMM TASK 49-51-51-000-001) and (Ref. AMM TASK 49-51-51-400-001).
2 If the load control valve is fully open:
_
- replace the PNEUMATIC SENSOR ASSY (8039KM) (Ref. AMM TASK 49-51-13-000-001) and (Ref. AMM TASK 49-51-13-400-001).
3 If the fault continues:
_
- replace the SURGE CONTROL VALVE (8058KM) (Ref. AMM TASK 49-51-52-000-002) and (Ref. AMM TASK 49-51-52-400-002).
4 If the fault continues:
_
- do a check of the electrical connectors for the surge control valve and the transducers for damage.
5 If the fault continues:
_
- replace the ECB (59KD) (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 A254
Config-1 Aug 01/05 CES
R **ON A/C 001-003, 051-099, 401-499,
G. If: .the bleed pressure is low with one engine in MIN IDLE operation, to supply back pressure on ENG. .the APU self test gives no maintenance message.
NOTE : On the APU page of the lower ECAM display unit, the BLEED (PSI)
____
value is within 8 psig.
NOTE : Aircraft configuration:
____
- the PACK 1 and 2 p/bsw are OFF,
- the APU BLEED valve p/bsw is ON,
- do one MES at a time.
- isolate the left or right engine.
(1) For the related engine:
- do the trouble shooting of the engine STARTER SHUTOFF VALVE (SAV). Refer to the related trouble shooting procedure in the applicable
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