NOTE : Make sure that no other aircraft valves are open during the MES.
____
.the APU self test gives no maintenance message.
NOTE : Aircraft configuration:
____
- the PACK 1 and 2 p/bsw are OFF,
- the APU BLEED valve p/bsw is ON,
- both engines BLEED p/bsw are off,
- MES motoring test with one engine.
- 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:
- check the load control valve position during the 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).
a 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).
b If the fault continues:
_
- do a check of the electrical connectors for the surge control valve and the transducers for damage.
c 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 A260
Config-1 Aug 01/05 CESR **ON A/C 001-003, 051-099, 401-499,
M. If: .the bleed pressure has large fluctuation of +/- 20 psig with both packs in operation. .the APU self test gives no maintenance message.
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.
- replace the PACK-FLOW CONTROL VALVE (8HB) and/or PACK-FLOW CONTROL VALVE (11HB) (Ref. AMM TASK 21-51-51-000-001) and (Ref. AMM TASK 21-51-51-400-001).
(1) If the fault continues:
- do a check for blockade of the Pack Heat Exchanger(s). Replace/Clean as necessary (Ref. AMM TASK 21-52-24-000-001) and (Ref. AMM TASK 21-52-24-400-001).
R **ON A/C 055-099, 401-499,
N. If. . a low APU bleed pressure cannot be confirmed, . there is a pilot/maintenance report of a low APU pressure during Engine 1 start:
- replace VALVE-FLOW CTL (11HB) (Ref. AMM TASK 21-51-51-000-001) and (Ref. AMM TASK 21-51-51-400-001).
R **ON A/C 001-003, 051-099, 401-499,
P. Do the test given in para. 3.
TASK 49-00-00-810-847- 01
No APU Bleed-Air Pressure, Low or Fluctuating APU Bleed-Air Pressure (with AIDS Support) (GTCP 36-300)
WARNING : MAKE SURE THAT THE FWD AVIONICS ACCESS DOOR 811 IS OPEN. WITH A
_______ WARNING PLACARD ATTACHED TO IT. THE WARNING NOTICE MUST TELL PERSONS NOT TO CLOSE THE DOOR. THIS PREVENTS ACCIDENTAL PRESSURIZATION OF THE AIRCRAFT.
1. Possible Causes
_______________
- ECB (59KD)
- VALVE-FLOW CTL (11HB)
- IGV ACTUATOR P21
- APU
- surge valve filter
- SURGE CONTROL VALVE P18
- PNEUMATIC SENSOR ASSY
- aircraft bleed system
- LOAD CONTROL VALVE P12
- IGV ACTUATOR (8014KM)
- SURGE CONTROL VALVE (8058KM)
- PNEUMATIC SENSOR ASSY (8039KM)
- LOAD CONTROL VALVE (8050KM)
- LCIT SENSOR
- aircraft wiring
- leak check of the left pack and the related bleed ducts
- X-BLEED VALVE (6HV)
- leak check of the right pack and the related bleed ducts
- STARTER SHUTOFF VALVE (SAV)
- PACK-FLOW CONTROL VALVE (8HB)
- PACK-FLOW CONTROL VALVE (11HB)
- blockade of the Pack Heat Exchanger(s)
2. Job Set-up Information
______________________
A. Referenced Information
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REFERENCE DESIGNATION
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