APU AUTO SHUT DOWN - SENSOR FAILURE, EGT Thermocouples Fault (APS 3200)

TASK 49-00-00-810-889-A
APU AUTO SHUT DOWN - SENSOR FAILURE, EGT Thermocouples Fault (APS 3200)

1. Possible Causes

EGT THERMOCOUPLE 1 (8057KM1)
EGT THERMOCOUPLE 2 (8057KM2)
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ESPM 2052210
ESPM 2053210
ESPM 205321A
AMM 49-00-00-710-005	Self-Test of the ECB
ASM 496102
AMM 49-72-15-000-001	Removal of the Thermocouple (APS 3200)
AMM 49-72-15-400-002	Installation of the Thermocouple (APS 3200)

3. Fault Confirmation
Subtask 49-00-00-710-226-A ** ON A/C NOT FOR ALL

A. Do the self-test of the ECB (59KD) AMM 49-00-00-710-005.

4. Fault Isolation
Subtask 49-00-00-810-140-B ** ON A/C NOT FOR ALL

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

EGT TC1 (8057KM1) AND EGT TC2 (8057KM2):
Fault Code Number: 102
Additionally:
Fault Code Number: 035 or 036 and 037 or 038

NOTE: FCN 035-038 on Class 3 Faults Page

NOTE: The APU SHUTDOWNS report gives the maintenance message:
SENSOR FAILURE - EGT TC1 (8057KM1) AND EGT TC2 (8057KM2)
APU Auto Shut Down Fault Code Number: 102

NOTE: Message does not appear in case of self-test of the ECB

replace the EGT THERMOCOUPLE 1 (8057KM1) and the EGT THERMOCOUPLE 2 (8057KM2) AMM 49-72-15-000-001 and AMM 49-72-15-400-002.

(1) If the fault continues:

do a check and repair the wiring from the ECB (59KD) AB/A7, A6 to the EGT THERMOCOUPLE 1 (8057KM1) P30/1, 2 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.
do a check and repair the wiring from the ECB (59KD) AB/A9, A8 to the EGT THERMOCOUPLE 2 (8057KM2) P31/1, 2 ASM 496102 ESPM 2052210 ESPM 2053210 ESPM 205321A.

Subtask 49-00-00-710-227-B ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:24 UTC