Possible Engine 1 Fire or Detection System Failure

TASK 26-21-00-810-819-A
Possible Engine 1 Fire or Detection System Failure

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
TSM TASK 26-21-00-810-801-A	The SQUIB Legend of the ENG 1/AGENT 1 Pushbutton Switch does not Come on
TSM TASK 26-21-00-810-802-A	The SQUIB Legend of the ENG 1/AGENT 2 Pushbutton Switch does not Come on
TSM TASK 75-41-00-810-805-A	High Nacelle Temperature Indication on Engine 1
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)
AMM 26-21-41-000-001	Removal of the Engine Fire-Extinguisher Bottle
AMM 26-21-41-400-001	Installation of the Engine Fire-Extinguisher Bottle
AMM 72-00-00-200-002	Procedure After Engine Fire or Use of Fire-Extinguishing Agents
AMM 72-00-00-200-007	Procedure After Engine Fire or Use of Fire-Extinguishing Agents

3. Fault Confirmation
Subtask 26-21-00-710-082-A ** ON A/C NOT FOR ALL

A. Do an inspection of the engine for signs of fire damage.

4. Fault Isolation
Subtask 26-21-00-810-068-A ** ON A/C NOT FOR ALL

A. If you find signs of fire damage:
(1) Put the engine back to its initial condition AMM 72-00-00-200-002.
(2) If the engine fire-extinguisher bottles are discharged:
(a) Replace the engine fire-extinguisher bottles AMM 26-21-41-000-001 and AMM 26-21-41-400-001.
(b) Do the test given in Para. 4.C.
(3) If the engine fire-extinguisher bottles are not discharged:
(a) Do the test given in Para. 4.C.

Subtask 26-21-00-810-069-A ** ON A/C NOT FOR ALL

B. If you do not find signs of fire damage:

Make sure that there was no nacelle overheat (Ref. TSM TASK 75-41-00-810-805).

(1) If there was a nacelle overheat:
(a) Repair and put the engine back to its initial condition AMM 72-00-00-200-002.
(b) If the engine fire-extinguisher bottles are discharged:

Replace the engine fire-extinguisher bottles AMM 26-21-41-000-001 and AMM 26-21-41-400-001.
Do the test given in Para. 4.C.

Do the test given in Para. 4.C.

(2) If there was no nacelle overheat:
(a) Repair the fire protection system (Ref. TSM TASK 26-21-00-810-801) and (Ref. TSM TASK 26-21-00-810-802).
(b) If the engine fire-extinguisher bottles are discharged:

Do the procedure after engine fire or use of fire-extinguishing agents AMM 72-00-00-200-002.
Replace the engine fire-extinguisher bottles AMM 26-21-41-000-001 and AMM 26-21-41-400-001.
Do the test given in Para. 4.C.

Do the test given in Para. 4.C.

Subtask 26-21-00-810-068-B ** ON A/C NOT FOR ALL

C. If you find signs of fire damage:
(1) Put the engine back to its initial condition AMM 72-00-00-200-007.
(2) If the engine fire-extinguisher bottles are discharged:
(a) Replace the engine fire-extinguisher bottles AMM 26-21-41-000-001 and AMM 26-21-41-400-001.
(b) Do the test given in Para. 4.C.
(3) If the engine fire-extinguisher bottles are not discharged:
(a) Do the test given in Para. 4.C.

Subtask 26-21-00-810-069-B ** ON A/C NOT FOR ALL

D. If you do not find signs of fire damage:

Make sure that there was no nacelle overheat (Ref. TSM TASK 75-41-00-810-805).

(1) If there was a nacelle overheat:
(a) Repair and put the engine back to its initial condition AMM 72-00-00-200-007.
(b) If the engine fire-extinguisher bottles are discharged:

Replace the engine fire-extinguisher bottles AMM 26-21-41-000-001 and AMM 26-21-41-400-001.
Do the test given in Para. 4.C.

Do the test given in Para. 4.C.

Do the procedure after engine fire or use of fire-extinguishing agents AMM 72-00-00-200-007.
Replace the engine fire-extinguisher bottles AMM 26-21-41-000-001 and AMM 26-21-41-400-001.
Do the test given in Para. 4.C.

Do the test given in Para. 4.C.

Subtask 26-21-00-710-083-A ** ON A/C NOT FOR ALL

E. Test

do the operational test of the fire protection system AMM 26-12-00-710-001 and AMM 26-12-00-710-002.

[Rev.8 from Aug 2018] 2026.04.04 04:27:24 UTC