A320飞机维护手册 AMM 机载辅助动力 AIRBORNE AUXILIARY POWER4(127)

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 -a switch cover. The switch lever (attached to the end of the shaft) is attached so that rotation of the shaft causes an equivalent rotation of the switch lever. The switch lever makes the switches send an open/closed signal when the butterfly plate is fully open/closed. Visual indication of the position of the butterfly plate is given on top of the switch cover. A groove in the end of the butterfly shaft aligns with an OPEN/CLOSED indicator mark to do this.
 6. Operation/Control and Indication
________________________________
 A. Start Procedure of APU Bleed-Air Supply The start sequence of the APU is complete when the APU acquires 95% speed (Ref. AMM 49-42-00). Above the acquired 95% + 2sec speed the APU is obtainable for the supply of bleed-air and electrical power. Information on the ECAM and the overhead panel shows that the APU is available: - on the APU page of the lower ECAM display unit, the green AVAIL
 indication comes on, - on the APU overhead panel 25VU, the green AVAIL legend on the APU START
 pushbutton switch comes on, When the APU is available you can push the APU BLEED pushbutton switch to start the APU bleed-air supply. When you push the APU BLEED pushbutton switch:
 -the blue ON legend in the APU BLEED pushbutton switch comes on,

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-51-00Page 9 201-210, Config-2 Aug 01/05
 CES

 -the BMC starts a test of the sensing elements on the APU bleed-air duct and the left wing bleed-air ducts. If the test is correct the BMC transmits a signal to the ECB. Then the ECB opens the APU load control valve.
 NOTE : If the BMC 1 finds a leak in the APU bleed-air ducts, while there
____ is a Main Engine Start (MES) signal from the engines, it ignores the leak signal and tells the ECB to open the APU bleed load valve.
 B. Stop of the APU Bleed-Air Supply To stop the APU bleed-air supply you release the APU BLEED pushbutton switch:
 -
the blue ON legend on the APU BLEED pushbutton switch goes off,

 -
the BMCs remove the 'demand' signal to the ECB,

 -
the APU load control valve closes and stops the bleed air supply,

 - on the BLEED and APU pages of the lower ECAM display unit, the APU bleed-valve symbol is shown in the closed position.
 NOTE : If an APU emergency shutdown or an APU automatic shutdown occurs,
____
 the APU bleed air supply stops automatically.

 C. Indicating The subsequent status of the bleed and surge air is shown on the lower ECAM display unit:
 -
the load control valve position,

 -
the BLEED pressure indication in PSI.

 (1)
 Load Control Valve Symbol The ECB transmits the APU BLEED VALVE FC signal (label 037) from the load control valve to the SDACs for the position indication of the APU load control valve.

 (2)
 BLEED Pressure Indication (PSI) The ECB receives the air pressure signal from the total pressure transducer. It convertes the air pressure signal into digital data and transmits the BLEED AIR PRESSURE data (label 166) to the SDACs. The SDACs uses the CORRECTED AVERAGE STATIC PRESSURE data (label 246) from the ADIRS and BLEED AIR PRESSURE data to give the indication for the APU BLEED pressure in PSI.

 

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-51-00Page 10 201-210, Config-2 Aug 01/05
 CES  BLEED AND SURGE AIR - DESCRIPTION AND OPERATION

_______________________________________________
 1.
 General

_______ The APU load compressor supplies the APU bleed air. The quantity changes with the different bleed air demands of the pneumatic systems. Variable Inlet Guide Vanes (IGVs) (which are installed at the load compressor inlet) control the quantity of the bleed air. An APU bleed control valve is installed at the scroll outlet on the right lower part of the APU. The APU bleed control valve controls the air from the load compressor to the exhaust or to the pneumatic system of the aircraft. The Electronic Control Box (ECB) 59KD controls and monitors the APU bleed air supply and the surge air flow. You start and stop the bleed air supply with the APU BLEED pushbutton switch, which is on the AIR overhead panel 30VU in the cockpit.

 2.
 Component Location

__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
 -------------------------------------------------------------------------------SENSOR - COMPRESSOR DISCHARGE PRESS 316 316AR 49-51-19 DUCT - AIR BYPASS 316 316AR 49-51-42 VALVE - BLEED CONTROL 316 316AR 49-51-53
 3. System Description
__________________
 A. Primary Components The bleed and surge air system has the subsequent primary components:
　
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