APU AUTO SHUT DOWN - SURGE /REVERSE FLOW, Bleed Control Valve Fault (APS3200)

TASK 49-00-00-810-904-A
APU AUTO SHUT DOWN - SURGE /REVERSE FLOW, Bleed Control Valve Fault (APS3200)

1. Possible Causes

fuel leaks
INLET T-P SENSOR (8013KM)
BLEED CONTROL VALVE (8051KM)
wiring
ELECTRONIC CONTROL BOX [59KD]
BLD FLOW XDCR (8039KM)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 49-00-00-810-937-A	No APU Bleed-Air Pressure, Low or Fluctuating APU Bleed-Air Pressure (with AIDS support) (APS 3200)
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 49-00-00-710-008	Operational Test of the APU
AMM 49-20-00-290-001	APU Power Plant Borescope Inspection (APS 3200)
AMM 49-23-17-000-001	Removal of the Inlet Pressure/Temperature Sensor (APS 3200)
AMM 49-23-17-400-001	Installation of the Inlet Pressure/Temperature Sensor (APS 3200)
AMM 49-23-51-710-001	Push/Pull Test of the Inlet Guide Vane Mechanism (APS 3200)
AMM 49-51-19-000-002	Removal of the Sensor - Compressor Discharge Pressure (APS 3200)
AMM 49-51-19-400-002	Installation of the Sensor - Compressor Discharge Pressure (APS 3200)
AMM 49-51-53-000-001	Removal of the Bleed Control Valve (APS 3200)
AMM 49-51-53-400-001	Installation of the Bleed Control Valve (APS 3200)
ASM 496101
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 49-00-00-710-256-A ** ON A/C NOT FOR ALL

A. Do the operational test of the APU (4005KM) AMM 49-00-00-710-008.

NOTE: During the operational test of the APU, carefully examine the fuel lines from the fuel control unit to the bleed control valve:

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

4. Fault Isolation
Subtask 49-00-00-810-155-B ** ON A/C NOT FOR ALL

A. If the APU Last Leg Report gives the maintenance message:

BLEED CTL VLV (8051KM):

Fault Code Number: 097

Additionally:

Fault Code Number: 096

Fault Code Number: 143

Additionally:

Fault Code Number: 169

NOTE: The APU SHUTDOWNS report gives the maintenance message:
SURGE / REVERSE FLOW - BLEED CTL VLV (8051KM)
APU Auto Shut Down Fault Code Number: 097 or 143

(1) Do a check of the IGV Actuator guide pin for correct installation. If the pin is disengaged, replace the pin.
(a) If the fault continues:

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

NOTE: If FCN 169 is related.

replace the INLET T-P SENSOR (8013KM) AMM 49-23-17-000-001 and AMM 49-23-17-400-001.

(b) If the fault continues:

replace the BLEED CONTROL VALVE (8051KM) AMM 49-51-53-000-001 and AMM 49-51-53-400-001.

1 If the fault continues:

do a check and repair the aircraft wiring between the ELECTRONIC CONTROL BOX [59KD] AB/D7, J5, H3, F10, G6, G7 to the BLEED CONTROL VALVE (8051KM) P33/5, 6, 3, 4, 1, 2 ASM 496101 ESPM 2052210 ESPM 2053210 ESPM 205321A.

. If the fault continues:

replace the BLD FLOW XDCR (8039KM) AMM 49-51-19-000-002 and AMM 49-51-19-400-002.

do a check and repair the aircraft wiring from the ELECTRONIC CONTROL BOX [59KD] AB/A4, A1, B2, B3, A2, A3 to the BLD FLOW XDCR (8039KM) P24/1, 2, 3, 4, 5, 6 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

(d) If the fault continues:

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

(e) If the fault continues:

do the borescope inspection of the load compressor AMM 49-20-00-290-001.

(f) If the fault continues:

do the TSM procedure (Ref. TSM TASK 49-00-00-810-937).

Subtask 49-00-00-710-257-A ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:40:36 UTC