Loss of APU Fire- Test LOOP B

TASK 26-13-00-810-811-A
Loss of APU Fire- Test LOOP B

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 26-12-12-000-001	Removal of the ENG/APU Fire Panel
AMM 26-12-12-400-001	Installation of the ENG/APU Fire Panel
AMM 26-13-00-710-002	BITE Test of the APU Fire and Overheat Detection System
ASM 261301
AMM 26-13-34-000-001	Removal of the APU Fire-Detection Unit (FDU)
AMM 26-13-34-400-001	Installation of the APU Fire-Detection Unit (FDU)

3. Fault Confirmation
Subtask 26-13-00-710-070-A

A. Do the BITE test of the APU fire and overheat detection system AMM 26-13-00-710-002.

4. Fault Isolation
Subtask 26-13-00-810-073-A

A. If the test gives the maintenance message CHECK FDU APU FIRE TEST PB SW/FDU APU:

(1) If the fault continues:

do a check of the wiring between the ENG/APU fire panel 1WD pin E/M and the FDU APU pin B/C and repair if necessary ASM 261301.

(2) If the fault continues:

do a check and repair the wiring from the ENG/APU fire panel 1WD pin E/M to the circuit breaker 2WG ASM 261301.

(3) If the fault continues:

Subtask 26-13-00-710-071-A

B. Do the test given in Para. 3.

[Rev.8 from Aug 2018] 2026.04.04 04:27:17 UTC