-
the ECB energizes the igniters,
-
the ECB energizes the de-oil solenoid valve to the open position,
-
the APU operation data is shown on the lower ECAM display unit.
NOTE : During Ram Air Turbine (RAT) extension, APU starting is inhibited by
____
the Battery Charge Limiters (BCL 1 and BCL 2), which prevent
operation of the main start contactor 5 KA.
At 3% speed, the ECB energizes the fuel solenoid valve to the open position.
At 5% speed, the ECB controls the fuel flow to the APU.
At 55% speed, the ECB:
-
de-energizes the start contactor 5KA which switches off the starter motor 8KA and the ECB accelerates the APU automatically,
-
de-energizes the back-up start contactor 10KA, after 5 seconds,
-
de-energizes the de-oil solenoid valve to the closed position.
At 95% speed:
Starting System - Block Diagram
Figure 003
CES
-
the ECB controls and monitors the APU automatically,
-
the green AVAIL legend in the START pushbutton switch comes on,
-
the blue ON legend in the START pushbutton switch goes off.
-
the APU bleed valve is ready for operation,
-
the APU generator is ready for operation.
STARTING - MAINTENANCE PRACTICES
________________________________
TASK 49-42-00-960-001
Replacement of the APU Start Fuse (6KA)
WARNING : MAKE SURE THAT NO AC OR DC POWER IS CONNECTED TO THE AIRCRAFT
_______
ELECTRICAL CIRCUITS.
THERE IS A RISK OF ELECTROCUTION IF THE AC OR DC POWER STAYS
CONNECTED.
1.
Reason for the Job
__________________
Self Explanatory
2.
Job Set-up Information
______________________
A. Fixtures, Tools, Test and Support Equipment
-------------------------------------------------------------------------------
REFERENCE QTY DESIGNATION
-------------------------------------------------------------------------------
No specific warning notices
No specific access platform 0.5 m (1 ft. 8 in.) R No specific Torque Wrench : range 0.00 to 1.20 m.daN R (0.00 to 9.00 lbf.ft)
B. Expendable Parts
-------------------------------------------------------------------------------
FIG.ITEM |DESIGNATION |IPC-CSN
-------------------------------------------------------------------------------
3 fuse 49-42-08 01 -140A 3 fuse 49-42-08 01A-140 3 fuse 49-42-08 01B-140
EFF : ALL
49-42-00Page 201
C. 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
25-11-41-000-001 Removal of the Third Occupant Seat
25-11-41-400-001 Installation of the Third Occupant Seat
R 49-00-00-860-003 APU Start by External Power (GTCP 36-300)
R 49-00-00-860-004 APU Shutdown by External Power (GTCP 36-300) 49-00-00-860-005 APU Start by External Power (APS 3200) 49-00-00-860-006 APU Shutdown by External Power (APS 3200) 49-00-00-860-008 APU Start by External Power (131-9(A)) 49-00-00-860-009 APU Shutdown by External Power (131-9(A)) 49-42-00-991-001 Fig. 201
3. Job Set-up
__________
Subtask 49-42-00-010-050
A. Get Access
(Ref. Fig. 201/TASK 49-42-00-991-001)
(1)
Remove the third occupant seat (Ref. TASK 25-11-41-000-001)
(2)
In the cockpit, on the left lower side of the panel 120VU: - open the access door (1).
(3)
Put the access platform at the access door 121AL.
(4)
Open the access door 121AL.
Subtask 49-42-00-860-050
B. Safety Precautions
(1)
Make sure that the external power connector is not connected to the aircraft EXT PWR receptacle.
(2)
Put a warning notice on the access door 121AL to tell persons not to connect the external power connector.
EFF : ALL
49-42-00Page 202
Fuse 6KA - APU Start Supply
Figure 201/TASK 49-42-00-991-001
EFF : ALL 49-42-00 Page 203
Feb 01/98
CES
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