APU AUTO SHUT DOWN - LOSS OF SPEED, Speed Sensor 2 and ECB 59KD Fault (APS 3200)

TASK 49-00-00-810-888-A
APU AUTO SHUT DOWN - LOSS OF SPEED, Speed Sensor 2 and ECB 59KD Fault (APS 3200)

1. Possible Causes

SPEED SENSOR 2 (8060KM2)
ELECTRONIC CONTROL BOX [59KD]

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 49-61-34-000-002	Removal of the Electronic Control Box (ECB) (APS 3200)
AMM 49-61-34-400-002	Installation of the Electronic Control Box (ECB) (APS 3200)
AMM 49-71-13-000-002	Removal of the Speed Sensor (APS 3200)
AMM 49-71-13-400-002	Installation of the Speed Sensor (APS 3200)

3. Fault Confirmation
Subtask 49-00-00-710-224-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 49-00-00-810-139-B ** ON A/C NOT FOR ALL

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

SPD SNSR2 (8060KM2) AND ECB (59KD):
Fault Code Number: 146
Additionally:
Fault Code Number(s):
094 or 095 and
027 or 028 or 100

NOTE: FCN 027, 028, 094 and 095 on Class 3 Faults Page

NOTE: The APU SHUTDOWNS report gives the maintenance message:
LOSS OF SPEED - SPD SNSR2 (8060KM2) AND ECB (59KD)
APU Auto Shut Down Fault Code Number: 146

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

replace the SPEED SENSOR 2 (8060KM2) AMM 49-71-13-000-002 and AMM 49-71-13-400-002.

(1) If the fault continues:

do a check and repair the wiring between the Speed Sensor2 (8060KM2) and the ECB (59KD) 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.

Subtask 49-00-00-710-225-B ** ON A/C NOT FOR ALL

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:34:23 UTC