-
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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