Failure of the ENG1 FIRE Pushbutton Switch or its Wiring to the GCU1

TASK 24-20-00-810-819-A
Failure of the ENG1 FIRE Pushbutton Switch or its Wiring to the GCU1

1. Possible Causes

Generator 1 contactor-module 30XN1
Terminal block 1999VT
Terminal block 400VT1
Terminal blocks T1, T2, T3 and N of IDG 1
Receptacle 400VC1
wiring

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
ASM 242202
AMM 24-41-00-740-004	Operational Check of the GPCU via the CFDS
AMM 24-41-00-861-002	Energize the Aircraft Electrical Circuits from the External Power
AMM 24-41-00-862-002	De-energize the Aircraft Electrical Circuits Supplied from the External Power
AMM 31-60-00-860-001	EIS Start Procedure
AMM 71-00-00-710-003	Engine Automatic Start
AMM 71-00-00-710-028	Engine Shutdown

3. Fault Confirmation
Subtask 24-20-00-700-104-A ** ON A/C NOT FOR ALL

A. Test
Not applicable.

NOTE: As the GEN1 was set to OFF because of a true failure, the test configuration is not necessary.

4. Fault Isolation
Subtask 24-20-00-810-093-A ** ON A/C NOT FOR ALL

A. If the fault symptom is identified by the CFDS message CHECK FIRE HANDLE 1 RESET GEN1 and the upper ECAM DU warning GEN1 FAULT:
(1) Do a visual inspection and repair or replace as necessary:

Generator 1 contactor-module 30XN1
Terminal block 1999VT
Terminal block 400VT1
Terminal blocks T1, T2, T3 and N of IDG 1
Receptacle 400VC1 .

(2) Do a check of the status of the ENG1 FIRE pushbutton switch on the FIRE panel (1WD).
(a) If the pushbutton switch has not been pushed:

Do a check for intermittent +28VDC and repair the wiring between respectively:
. the pin A/3A of the GCU1 and the pin A/C of the ENG/APU FIRE PNL (1WD)
. the pin A/3A of the GCU1 and the pin A/B3 of the SENSOR-TDC AC1 ASM 242202.

(b) If the pushbutton switch has been pushed:

Do the necessary maintenance procedure and then reset the generator 1.

Subtask 24-20-00-710-080-A ** ON A/C NOT FOR ALL

B. Do this operational test to make sure that the system operates correctly.
(1) Aircraft Maintenance Configuration
(a) Energize the aircraft electrical circuits
AMM 24-41-00-861-002.
(b) Do the EIS start procedure (Upper ECAM DU and lower ECAM DU only)
AMM 31-60-00-860-001
(2) On the panel 35VU:

push, release and push again the GEN1 pushbutton switch (3XU1).

(3) Do the operational check of the GPCU with the CFDS AMM 24-41-00-740-004.
(4) Start the engine 1 AMM 71-00-00-710-003.
(5) Do this test:

ACTION	RESULT
On the ECAM control panel: get the ELEC page.	On the lower ECAM display unit: the correct electrical parameters of GEN1 are shown and AC1 busbar is supplied by GEN1.

5. Close-up
Subtask 24-20-00-860-108-A ** ON A/C NOT FOR ALL

A. Put the aircraft back to its initial configuration.
(1) stop the engine 1 AMM 71-00-00-710-028.
(2) On the ECAM control panel, set the UPPER DISPLAY and LOWER DISPLAY potentiometers to OFF.
(3) De-energize the aircraft electrical circuits
AMM 24-41-00-862-002.

[Rev.8 from Aug 2018] 2026.04.04 04:26:11 UTC