DOC AIRBUS | TSM A320FLoss of the ENG 2 Fire-Test Loop B Input
TASK 26-12-00-810-847-A
Loss of the ENG 2 Fire-Test Loop B Input
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
3. Fault Confirmation
Subtask 26-12-00-710-144-A ** ON A/C NOT FOR ALL
Subtask 26-12-00-810-100-A ** ON A/C NOT FOR ALL
[Rev.8 from Aug 2018]
2026.04.04 04:27:12 UTC
Loss of the ENG 2 Fire-Test Loop B Input
1. Possible Causes
2. Job Set-up Information
A. Referenced Information
| REFERENCE | DESIGNATION |
|---|---|
| AMM 26-12-00-710-001 | Operational Check of Loop/Squib |
| AMM 26-12-00-710-002 | Operational Test of the Engine Fire and Overheat Detection with the Centralized Fault Display System (CFDS) |
| ASM 261202 | |
| 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 26-12-34-000-001 | Removal of the Engine Fire-Detection Unit (FDU) |
| AMM 26-12-34-400-001 | Installation of the Engine Fire-Detection Unit (FDU) |
Subtask 26-12-00-710-144-A ** ON A/C NOT FOR ALL
A. Test
(1) Do the operational test of the engine fire and overheat detection from the Multipurpose Control and Display Unit (MCDU) AMM 26-12-00-710-002.
Subtask 26-12-00-710-144-B ** ON A/C NOT FOR ALL 4. Fault Isolation(1) Do the operational test of the engine fire and overheat detection from the Multipurpose Control and Display Unit (MCDU) AMM 26-12-00-710-002.
Subtask 26-12-00-810-100-A ** ON A/C NOT FOR ALL
A. If the test gives the maintenance message CHECK FDU ENG2 FIRE TEST PB SW/FDU ENG2:
Subtask 26-12-00-810-100-B ** ON A/C NOT FOR ALL - replace the FDU-ENG2 [2WD2] AMM 26-12-34-000-001 and AMM 26-12-34-400-001.
- do a check of the wiring between the ENG/APU fire panel 1WD pin D/N and the engine 2 FDU pin B/C and repair if necessary ASM 261202.
- do a check and repair the wiring from the ENG/APU fire panel 1WD pin D/M to the circuit breaker 8WD2 ASM 261202.
- replace the ENG/APU FIRE PNL [1WD]
AMM 26-12-12-000-001 and AMM 26-12-12-400-001.
A. If during the test, the legend of the ENG2 FIRE pushbutton switch is not fully on (four rows not fully on):
Subtask 26-12-00-710-145-A ** ON A/C NOT FOR ALL - Replace the FDU-ENG2 [2WD2] AMM 26-12-34-000-001 and AMM 26-12-34-400-001.
- Do a check of the wiring between ENG/APU fire panel 1WD pin D/N and engine 2 FDU pin B/C and repair if necessary, ASM 261202.
- Do a check and repair the wiring between ENG/APU fire panel 1WD pin D/M and circuit breaker 8WD2, ASM 261202.
- Replace the ENG/APU FIRE PNL [1WD]
AMM 26-12-12-000-001 and AMM 26-12-12-400-001.
B. Do the test given in Para. 3.