Oil Quantity Indication on Engine 2 Higher than on Engine 1

TASK 79-00-00-810-811-A
Oil Quantity Indication on Engine 2 Higher than on Engine 1

1. Possible Causes

servo fuel heater
main oil/fuel heat exchanger
XMTR-OIL QTY [4002EN]
aircraft wiring
EIU-2 [1KS2]

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 71-00-00-710-006	Minimum Idle Check
AMM 73-11-20-000-001	Removal of the Servo Fuel Heater
AMM 73-11-20-000-002	Removal of the Servo Fuel Heater
AMM 73-11-20-400-001	Installation of the Servo Fuel Heater
AMM 73-11-20-400-002	Installation of the Servo Fuel Heater
AMM 73-25-34-000-040	Removal of the Engine Interface Unit (EIU)
AMM 73-25-34-400-040	Installation of the Engine Interface Unit (EIU)
AMM 79-21-20-000-001	Removal of the Main Oil/Fuel Heat Exchanger
AMM 79-21-20-000-002	Removal of the Main Oil/Fuel Heat Exchanger
AMM 79-21-20-400-001	Installation of the Main Oil/Fuel Heat Exchanger
AMM 79-21-20-400-002	Installation of the Main Oil/Fuel Heat Exchanger
AMM 79-31-15-000-040	Removal of the Oil Quantity Transmitter
AMM 79-31-15-000-041	Removal of the Oil Quantity Transmitter
AMM 79-31-15-400-040	Installation of the Oil Quantity Transmitter
AMM 79-31-15-400-041	Installation of the Oil Quantity Transmitter
ASM 793601

3. Fault Confirmation
Subtask 79-00-00-710-070-A ** ON A/C NOT FOR ALL

A. Test
(1) Not applicable, the fault is evident.

4. Fault Isolation
Subtask 79-00-00-865-051-A ** ON A/C NOT FOR ALL

A. Table of the circuit breakers used in this procedure:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	ENGINE/ENG2/OIL/QTY	1EN2	N41

Subtask 79-00-00-810-062-A ** ON A/C NOT FOR ALL

B. If the fault symptom is identified by the crew observation: ENG2-oil quantity indication higher that on engine 1:
(1) Do a check for overserviced tank. Drain unwanted oil quantity.
(2) Do a check to make sure that the oil tank level confirms the oil quantity indication on the lower ECAM display unit.
(a) If the check confirms the fault:

smell the oil for signs of fuel in it.

1 If confirmed:

replace the servo fuel heater AMM 73-11-20-000-001 and AMM 73-11-20-400-001
replace the main oil/fuel heat exchanger AMM 79-21-20-000-001 and AMM 79-21-20-400-001.

(b) If the check does not confirm the fault:

replace the XMTR-OIL QTY [4002EN] AMM 79-31-15-000-040 and AMM 79-31-15-400-040.

1 If the fault continues:

do a check and repair the aircraft wiring from the oil quantity transmitter (4002EN) to the SDAC1 (1WV1), SDAC2 (1WV2) and EIU2 (1KS2).

do a check for 28VDC at the oil quantity transmitter (4002EN).

1 If there is no 28VDC:

do a check of the aircraft wiring between the circuit breaker (1EN2) and the oil quantity transmitter (4002EN) ASM 793601.

2 If there is 28VDC:

do a check and repair the aircraft wiring from the oil quantity transmitter (4002EN) to the EIU2 (1KS2): pins AA/3, 4 to pins AA/8F, 8H ASM 793601.

a If the fault continues:

replace the EIU-2 [1KS2] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

Subtask 79-00-00-810-062-B ** ON A/C NOT FOR ALL

smell the oil for signs of fuel in it.

1 If confirmed:

replace the servo fuel heater AMM 73-11-20-000-002 and AMM 73-11-20-400-002
replace the main oil/fuel heat exchanger AMM 79-21-20-000-002 and AMM 79-21-20-400-002.

(b) If the check does not confirm the fault:

replace the XMTR-OIL QTY [4002EN] AMM 79-31-15-000-041 and AMM 79-31-15-400-041.

1 If the fault continues:

do a check and repair the aircraft wiring from the oil quantity transmitter (4002EN) to the SDAC1 (1WV1), SDAC2 (1WV2) and EIU2 (1KS2).

do a check for 28VDC at the oil quantity transmitter (4002EN).

1 If there is no 28VDC:

do a check of the aircraft wiring between the circuit breaker (1EN2) and the oil quantity transmitter (4002EN) ASM 793601.

2 If there is 28VDC:

do a check and repair the aircraft wiring from the oil quantity transmitter (4002EN) to the EIU2 (1KS2): pins AA/3, 4 to pins AA/8F, 8H ASM 793601.

a If the fault continues:

replace the EIU-2 [1KS2] AMM 73-25-34-000-040 and AMM 73-25-34-400-040.

Subtask 79-00-00-710-071-A ** ON A/C NOT FOR ALL

C. Do a minimum idle check AMM 71-00-00-710-006.

[Rev.8 from Aug 2018] 2026.04.04 04:38:21 UTC