(2)
Make sure that the electrical connectors are clean and in the correct condition.
(3)
Position the electrical leads (4) and install the clamps (2), with the screws (1) and the nuts (3).
(4)
TORQUE the nuts (3) to 40 lbf.in (0.45 m.daN).
(5)
Connect the electrical leads (4) to the igniter plugs.
(6)
TORQUE the lead end nuts to between 26 and 32 lbf.in (0.29 and 0.36 m.daN).
(7)
Connect the electrical leads (4) to the ignition unit (5).
(8)
TORQUE the lead end nuts to between 26 and 32 lbf.in (0.29 and 0.36 m.daN).
(9)
Connect the LT connector P10 to the ignition exciter. Subtask 49-41-43-865-057
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD
Subtask 49-41-43-710-051
C. Do the self-test of the ECB (Ref. TASK 49-00-00-710-005).
5. Close-up
________ Subtask 49-41-43-410-051
A. Close Access
(1)
Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).
(2)
Remove the access platform(s).
(3)
Remove the warning notice(s).
STARTING - DESCRIPTION AND OPERATION
____________________________________
R **ON A/C 001-003, 051-099, 401-499,
1.
General
_______ The starting system rotates and accelerates the rotor of the APU to 50 % of the APU's usual speed. You can operate the starting system from the APU panel in the cockpit. The Electronic Control Box (ECB) 59KD controls the start sequence of the APU. Three consecutive start attempts are permitted without cooldown. After the third start attempt the starter motor must cool down for at least 60 minutes.
2.
Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------2KA START SWITCH 25VU 210 5KA START CONTACTOR 120VU 212 6KA FUSE - APU START SUPPLY 120VU 212 132AZ 8KA STARTER MOTOR 313 315AL/ 49-42-51
316AR
10KA BACKUP START CONTACTOR 120VU 212
3. System Description
__________________
(Ref. Fig. 001, 002)
The primary parts of the starting system are:
-
the starter motor,
-
the starter clutch module,
-
the start contactor,
-
the back-up start contactor,
-
the ECB. When you operate the starting system the ECB energizes the start contactor (5KA) and the back-up start contactor (10KA). Thus the 28 V DC is supplied to the starter motor. The starter motor turns the APU main shaft through the starter clutch module and the gearbox. At 50% APU speed the ECB turns the starter motor off. The starter clutch module disengages mechanically when the self sustained APU speed is more than the starter motor speed. The timed acceleration logic of the ECB controls the APU acceleration during the APU start.
The starter motor has a brush wear indicator, if you can see the brush wear indicator the brushes inside the motor are serviceable.
Starting System - Component Location Figure 001 (SHEET 1)
R EFF : 001-003, 051-099, 401-499, 49-42-00Page 2 Config-1 Aug 01/05
CES
Starting System - Component Location Figure 001 (SHEET 2)
R EFF : 001-003, 051-099, 401-499, 49-42-00Page 3 Config-1 Aug 01/05
CES
Starter Motor and Starter Clutch
Figure 002
CES
4.
Power Supply
____________ The starting system gets the electrical power from the DC system of the aircraft. It supplies 28VDC to the BAT BUS 3PP through a fuse (6KA), the contactors to the starter motor (8KA).
5.
Interface
_________
The starting system has an interface with:
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