-
the BMCs removes the 'demand' signal to the ECB,
-
the APU bleed control valve turns in the discharge position and the bleed air supply stops,
- 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.
Bleed and Surge Air - Block Diagram
Figure 003
CES
APU Control and Indication
Figure 004
CES
B. Indicating The subsequent status of the bleed and surge air is shown on the lower ECAM display unit:
-
the bleed control valve position,
-
the BLEED pressure indication in PSI.
(1)
Bleed Control Valve Symbole The ECB transmits the APU BLEED VALVE FC signal (label 037) from the bleed control valve to the SDACs for the position indication of the APU bleed control valve.
(2)
BLEED Pressure Indication (PSI) The ECB receives the air pressure signal from the compressor discharge pressure sensor. 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.
BLEED AND SURGE AIR - DEACTIVATION/REACTIVATION
_______________________________________________
R **ON A/C 001-003, 051-099, 401-499,
TASK 49-51-00-040-001
Deactivation of the APU Bleed Load Control-Valve (8050KM) (GTCP 36-300)
WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______
WHEN YOU DO THE MAINTENANCE TASK(S).
1. Reason for the Job
__________________
Refer to the MMEL TASK: 36-12-02
APU Bleed Air Supply and Cross Bleed
System - APU BLEED Valve
2. Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific blanking caps
No specific circuit breaker(s) safety clip(s)
No specific warning notice
No specific access platform 3.5 m (11 ft. 6 in.)
B. Referenced Information
-------------------------------------------------------------------------------
REFERENCE DESIGNATION
-------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
the Ground Connector
52-41-00-010-001 Open the APU Doors for Access
52-41-00-410-001 Close the APU Doors after Access
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
49-51-00-991-001 Fig. 401
3. Job Set-up
__________ Subtask 49-51-00-860-054
A. Aircraft Maintenance Configuration
(1)
Energize the aircraft electrical circuits
(Ref. TASK 24-41-00-861-002).
(2)
On the panel 25VU, make sure that the APU MASTER SW pushbutton switch is off.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
Subtask 49-51-00-865-050
B. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41 122VU AIR BLEED/X FEED VALVE/NORM 1HV Z20
Subtask 49-51-00-010-050
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-010-001).
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