Engine 1 (2) Less than Idle

TASK 73-00-00-810-948-A
Engine 1 (2) Less than Idle

1. Possible Causes

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 28-24-41-000-001	Removal of the LP Fuel Valve
AMM 28-24-41-400-001	Installation of the LP Fuel Valve
AMM 28-24-51-000-001	Removal of the LP Fuel Valve Actuator
AMM 28-24-51-400-001	Installation of the LP Fuel Valve Actuator

3. Fault Confirmation
Subtask 73-00-00-710-390-A ** ON A/C NOT FOR ALL

A. Disregard the ENG 1 SHUT DOWN ECAM (ENG 2 SHUT DOWN ECAM) fault message if:
- The message is shown at the engine shutdown transition and
- The message is shown less than one second.
In this case, no maintenance action is necessary.

4. Fault Isolation
Subtask 73-00-00-810-302-A ** ON A/C NOT FOR ALL

A. Low Pressure (LP) Fuel Valve Check

NOTE: The data that follows is for the fault on ENG 1. If the fault is on ENG 2, refer to the data between brackets.

(1) On the ENG/APU FIRE PANEL (1WD) located on the overhead panel 20VU, make sure that the ENG 1 FIRE PUSH (ENG 2 FIRE PUSH) pushbutton switch (P/BSW) is in the closed and guarded position.
(2) On the ECAM control panel 11VU, push (in) the FUEL P/BSW to get the FUEL system page on the ECAM lower Display Unit (DU).
(3) Make sure the ENG/MASTER 1 (3KC) (ENG/MASTER 2 (2KC)) switch (panel 115VU) is set to OFF.
(4) On the FUEL system page make sure the ENG 1 (ENG 2) LP fuel valve symbol shows that the valve is closed (amber crossline).
(5) Make a note of the valve transit time for the following actions:

NOTE: The LP fuel valve symbol shows a 45 degree amber line while in transit.

(a) Set the ENG/MASTER 1 (3KC) (ENG/MASTER 2 (2KC)) switch (panel 115VU) to ON and immediately observe the ENG 1 (ENG 2) LP fuel valve symbol on the FUEL system page.
(b) Make sure the ENG 1 (ENG 2) LP fuel valve symbol changes to open (green in-line).
(6) Make a note of the valve transit time for the following actions:

NOTE: The LP fuel valve symbol shows a 45 degree amber line while in transit.

(a) Set the ENG/MASTER 1 (3KC) (ENG/MASTER 2 (2KC)) switch (panel 115VU) to OFF and immediately observe the ENG 1 (ENG 2) LP fuel valve symbol on the FUEL system page.
(b) Make sure the ENG 1 (ENG 2) LP fuel valve symbol changes to closed (amber crossline).
(7) If the ENG 1 (ENG 2) LP fuel valve opens or closes in more than five seconds:
- Replace the ACTUATOR-LP FUEL VALVE, ENG 1 (9QG) (ACTUATOR-LP FUEL VALVE, ENG 2 (10QG)) AMM 28-24-51-000-001 and AMM 28-24-51-400-001.
- Replace the VALVE-LP FUEL, ENG 1 (12QM) (VALVE-LP FUEL, ENG 2 (13QM)) AMM 28-24-41-000-001 and AMM 28-24-41-400-001.
(8) If the transit time is less than five seconds:
- Continue the trouble shooting.
(9) Make a record of the ECAM warning(s) related to the ENG 1 (ENG 2) and/or CFDS message(s) related to the FADEC 1 (FADEC 2) system, then do the applicable trouble shooting procedure.

[Rev.8 from Aug 2018] 2026.04.04 04:36:11 UTC