APU AUTO SHUT DOWN - OVERTEMPERATURE, Inlet Guide Vane Actuator Fault (APS 3200)

TASK 49-00-00-810-905-A
APU AUTO SHUT DOWN - OVERTEMPERATURE, Inlet Guide Vane Actuator Fault (APS 3200)

1. Possible Causes

fuel leaks
wiring
ELECTRONIC CONTROL BOX [59KD]
INLET GUIDE-VANE ACTUATOR (8014KM)
FUEL CONTROL UNIT (8022KM)
FUEL FLOW DIVIDER (8024KM)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 28-22-00-810-801-A	APU Fuel System - Low Pressure
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 28-22-00-710-002	Operational Test of the APU Fuel-Pump System
AMM 49-00-00-710-008	Operational Test of the APU
AMM 49-23-51-000-003	Removal of the Inlet Guide Vane Actuator (APS 3200)
AMM 49-23-51-400-003	Installation of the Inlet Guide Vane Actuator (APS 3200)
AMM 49-23-51-710-001	Push/Pull Test of the Inlet Guide Vane Mechanism (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)
ASM 496102
AMM 49-61-34-000-002	Removal of the Electronic Control Box (ECB) (APS 3200)
AMM 49-61-34-400-002	Installation of the Electronic Control Box (ECB) (APS 3200)

3. Fault Confirmation
Subtask 49-00-00-710-258-A ** ON A/C NOT FOR ALL

A. Check/Test
(1) Do the operational test of the APU AMM 49-00-00-710-008.

NOTE: Make sure that the fuel supply to the APU is correct AMM 28-22-00-710-002. If the fuel supply is not correct, do the trouble shooting of APU low fuel pressure (Ref. TSM TASK 28-22-00-810-801).

NOTE: During the operational test of the APU, carefully examine the fuel lines from the fuel control unit to the inlet guide-vane actuator:

fuel leaks are not permitted, correct/replace as necessary.

4. Fault Isolation
Subtask 49-00-00-810-156-B ** ON A/C NOT FOR ALL

A. Maintenance Action
(1) If the APU Last Leg Report gives the maintenance message:

IGV ACTR (8014KM)
Additionally:

If the APU Last Leg Report gives the maintenance message:
ECB 59KD:
Fault Code Number: 064 or 066

NOTE: The APU SHUTDOWNS report gives the maintenance message:
OVERTEMPERATURE - IGV ACTR (8014KM)
APU Auto Shut Down Fault Code Number: 098

do a check and repair the wiring from the ECB (59KD) AB/G8, G9, E12, E11, E8, E9 to the INLET GUIDE-VANE ACTUATOR (8014KM) P21/1, 2, 3, 4, 5, 6 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

(a) If the fault continues:

replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-002 and AMM 49-61-34-400-002.

(2) If the APU Last Leg Report gives the maintenance message:

IGV ACTR (8014KM)
Fault Code Number: 098

NOTE: The APU SHUTDOWNS report gives the maintenance message:
OVERTEMPERATURE - IGV ACTR (8014KM)
APU Auto Shut Down Fault Code Number: 098

do the push/pull test of the IGV mechanism AMM 49-23-51-710-001.

(a) If the push/pull test is OK:

replace the INLET GUIDE-VANE ACTUATOR (8014KM) AMM 49-23-51-000-003 and AMM 49-23-51-400-003.

1 If the fault continues:

replace the FUEL CONTROL UNIT (8022KM) AMM 49-32-11-000-002 and AMM 49-32-11-400-002.

a If the fault continues:

replace the FUEL FLOW DIVIDER (8024KM) AMM 49-32-12-000-002 and AMM 49-32-12-400-002.

b If the fault continues:

do a check and repair the wiring from the ECB (59KD) AB/G8, G9, E12, E11, E8, E9 to the INLET GUIDE-VANE ACTUATOR (8014KM) P21/1, 2, 3, 4, 5, 6 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

Subtask 49-00-00-710-259-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:25 UTC