Low-Oil Level (131-9(A))

TASK 49-00-81-810-867-A
Low-Oil Level (131-9(A))

1. Possible Causes

OIL LEVEL SHOWS LOW
the oil level is below the ADD mark
APU [4005KM]
LOW OIL LEVEL SWITCH (P8)
aircraft wiring
ELECTRONIC CONTROL BOX [59KD]
LOW OIL LEVEL SWITCH (8087KM)

2. Job Set-up Information
A. Referenced Information

REFERENCE	DESIGNATION
AMM 49-00-00-790-003	Leak Test of the APU
AMM 49-11-11-000-004	Removal of the Power Plant (APU) (131-9(A))
AMM 49-11-11-400-004	Installation of the Power Plant (APU) (131-9(A))
ASM 496104
AMM 49-61-34-000-003	Removal of the Electronic Control Box (ECB) (131-9(A))
AMM 49-61-34-400-003	Installation of the Electronic Control Box (ECB) (131-9(A))
AMM 49-90-00-600-007	Check Oil Level and Replenish (131-9(A))
AMM 49-93-16-000-003	Removal of Oil Level Switch (131-9(A))
AMM 49-93-16-400-003	Installation of Oil Level Switch (131-9(A))

3. Fault Confirmation
Subtask 49-00-81-710-084-A ** ON A/C NOT FOR ALL

A. Read-out of ECB Trouble-Shooting Data
(1) Put the APU MASTER SW to the ON position.
(2) Get access to the APU LAST LEG/PREVIOUS LEG report.
(3) Push the '>' adjacent to the related CFDS failure message:

the MCDU menu shows:
OIL LEVEL SHOWS LOW

(4) Get access to the APU GND SCANNING menu.

4. Fault Isolation
Subtask 49-00-81-810-070-A ** ON A/C NOT FOR ALL

A. If the APU GND SCANNING menu gives the maintenance message

LOW OIL LEVEL:

associated with the Fault Code Number (FCN) 99.

do a visual check on the oil sight glass on the accessory drive gearbox and make sure that the oil level in the APU oil reservoir is sufficient.

(1) If the oil level is below the ADD mark :

NOTE: If the APU page of the ECAM shows 'LOW OIL LEVEL' and there is no oil leakage, Airbus recommends to do oil servicing before 10 APU operating hours.

do the oil servicing AMM 49-90-00-600-007.
calculate the APU oil consumption.

(a) If there is a sudden increase in the APU oil consumption or if the APU uses too much oil:

examine the APU for oil leaks on the oil system components or oil lines AMM 49-00-00-790-003.

1 If you find oil leaks:

correct/replace as necessary.

a If the fault continues:

replace the APU [4005KM] AMM 49-11-11-000-004 and AMM 49-11-11-400-004.

(2) If the oil level is above the ADD mark:

replace the LOW OIL LEVEL SWITCH (P8) AMM 49-93-16-000-003 and AMM 49-93-16-400-003.

(a) If the fault continues:

do a check and repair the aircraft wiring from
the ECB (59KD) AB/H2 to the LOW OIL LEVEL SWITCH (P8) P8/2
and
the LOW OIL LEVEL SWITCH (P8) P8/1 to GND
ASM 496104.

(b) If the fault continues:

replace the ELECTRONIC CONTROL BOX [59KD] AMM 49-61-34-000-003 and AMM 49-61-34-400-003

Subtask 49-00-81-810-070-B ** ON A/C NOT FOR ALL

A. If the APU GND SCANNING menu gives the maintenance message

LOW OIL LEVEL:

associated with the Fault Code Number (FCN) 245.

do a visual check on the oil sight glass on the accessory drive gearbox and make sure that the oil level in the APU oil reservoir is sufficient.