APU SLOW START, Start System (APS 3200)

TASK 49-00-81-810-900-A
APU SLOW START, Start System (APS 3200)

1. Possible Causes

2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 3.39 and 2.26 m.daN (25.00 and 16.67 lbf.ft )

B. Referenced Information

REFERENCE	DESIGNATION
AMM 49-11-11-000-003	Removal of the Power Plant (APU) (APS 3200)
AMM 49-11-11-400-003	Installation of the Power Plant (APU) (APS 3200)
AMM 49-16-00-210-002	Detailed Inspection of APU Air Intake, Diffuser Elbow, Seals and Felt Metal (APS 3200)
AMM 49-31-41-000-002	Removal of the Pilot Fuel Nozzles and Manifold (APS 3200)
AMM 49-31-41-400-002	Installation of the Pilot Fuel Nozzles and Manifold (APS 3200)
AMM 49-32-11-000-002	Removal of the Fuel Control Unit (APS 3200)
AMM 49-32-11-400-002	Installation of the Fuel Control Unit (APS 3200)
AMM 49-32-12-000-002	Removal of the Flow Divider (APS 3200)
AMM 49-32-12-400-002	Installation of the Flow Divider (APS 3200)
AMM 49-42-51-000-007	Removal of the Starter Motor (APS 3200)
AMM 49-42-51-200-006	Check Wear Indicator of Starter Motor Brush (APS 3200)
AMM 49-42-51-400-007	Installation of the Starter Motor (APS 3200)
AMM 49-42-52-000-002	Removal of the Starter Motor Clutch (APS 3200)
AMM 49-42-52-400-002	Installation of the Starter Motor Clutch (APS 3200)
AMM 49-52-53-000-001	Removal of the PMG and Cooling Fan Assembly (APS 3200)
AMM 49-52-53-400-001	Installation of the PMG and Cooling Fan Assembly (APS 3200)
AMM 49-91-42-200-003	Inspection of the Magnetic Drain Plug (APS 3200)

3. Fault Confirmation
Subtask 49-00-81-710-261-A ** ON A/C NOT FOR ALL

A. Not Applicable

4. Fault Isolation
Subtask 49-00-81-810-186-A ** ON A/C NOT FOR ALL

A. Do the subsequent checks

Do a check of the brush wear indicator of the starter motor AMM 49-42-51-200-006.
Do a check of the Magnetic Chip Detector (MCD) AMM 49-91-42-200-003.
Do a check of the APU Air Inlet Duct for leaks and blockage AMM 49-16-00-210-002.

(1) If the fault continues:
(a) Do a check of the APU for too much drag:

Remove the COOLING FAN/PMG ASSY (8053KM) AMM 49-52-53-000-001.
Use a socket adapter to manually turn the drive shaft of the COOLING FAN/PMG ASSY (8053KM), in a clockwise direction only.

NOTE: Be careful when turning the impeller.

NOTE: The torque should be to between 3.39 and 2.26 m.daN (25.00 and 16.67 lbf.ft )

2 If the APU rotors, bearings and gears make an inusual noise or if there is too much drag:

(2) If the fault continues:
(a) Do a check and make sure that the STARTER CLUTCH (8033KM) operates correctly :

Remove the MOTOR-STARTER [8KA] AMM 49-42-51-000-007.
Turn the STARTER CLUTCH (8033KM) clockwise (clutch disengagement), with your hand.

NOTE: The starter motor clutch disengages correctly if:

Turn the STARTER CLUTCH (8033KM) counter clockwise (clutch engagement), with your hand.

NOTE: The starter motor clutch engages correctly if:

1 If the starter motor clutch engages/disengages correctly:

2 If the starter motor clutch does not engage/disengage correctly:

(b) Install the inlet duct of the cooling fan AMM 49-52-53-400-001.
(3) If the fault continues:

(a) Replace the FUEL CONTROL UNIT (8022KM) AMM 49-32-11-000-002 and AMM 49-32-11-400-002.
(4) If the fault continues:

(a) Replace the PILOT NOZZLES AMM 49-31-41-000-002 and AMM 49-31-41-400-002.
(5) If the fault continues:

(a) Replace the FUEL FLOW DIVIDER (8024KM) AMM 49-32-12-000-002 and AMM 49-32-12-400-002.
(6) If the fault continues:

(a) Replace the APU [4005KM] AMM 49-11-11-000-003 and AMM 49-11-11-400-003.

[Rev.8 from Aug 2018] 2026.04.04 04:34:31 UTC