Installation of Oil Level Switch (131-9(A))

TASK 49-93-16-400-003-A
Installation of Oil Level Switch (131-9(A))

WARNING: DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS WHEN YOU DO THE MAINTENANCE TASK(S).

WARNING: BE CAREFUL WHEN YOU USE CONSUMABLE MATERIALS. OBEY THE MATERIAL MANUFACTURER'S INSTRUCTIONS AND YOUR LOCAL REGULATIONS.

1. Reason for the Job
Self explanatory
2. Job Set-up Information
A. Fixtures, Tools, Test and Support Equipment

REFERENCE	QTY	DESIGNATION
No specific	Torque wrench: range to between 0.616 and 0.504 m.daN (54.51 and 44.60 lbf.in )

B. Consumable Materials

REFERENCE	DESIGNATION
(Material No.03ABA1)	Synthetic base Lubricating Oil-Turbine Engine - -
(Material No.03ABB1)	Synthetic base Lubricating Oil-Turbine Engine Low Temp. -

C. Work Zones and Access Panels

ZONE/ACCESS	ZONE DESCRIPTION
315AL, 316AR

D. Expendable Parts

FIG.ITEM	DESIGNATION	IPC-CSN
3	PACKING	AIPC 49-93-09-01-030

E. Referenced Information

REFERENCE	DESIGNATION
TASK 24-42-00-861-001-A	Energize the Ground Service Network from the External Power
TASK 24-42-00-862-001-A	De-energize the Ground Service Network Supplied from the External Power
TASK 29-00-00-864-001-A	Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action
TASK 49-00-00-860-008-A	APU Start by External Power
TASK 49-00-00-860-008-A-01	APU Start by Batteries
TASK 49-00-00-860-009-A	APU Shutdown by External Power (131-9(A))
TASK 49-00-00-860-009-A-01	APU Shutdown by Batteries (131-9(A))
TASK 49-90-00-600-007-A	Check Oil Level and Replenish (131-9(A))
TASK 52-41-00-010-001-A	Open the APU Doors for Access
TASK 52-41-00-410-001-A	Close the APU Doors after Access
Oil Level Switch

3. Job Set-up
Subtask 49-93-16-865-057-A ** ON A/C NOT FOR ALL

A. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged:

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-93-16-860-054-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Energize the ground service network
(Ref. AMM TASK 24-42-00-861-001).
(2) On the panel 25VU make sure that the APU MASTER SW p/bsw is OFF.
(3) Make sure that there is a warning notice in the cockpit to tell persons not to start the APU.
(4) Make sure that the hydraulic systems are depressurized
(Ref. AMM TASK 29-00-00-864-001).
(5) Make sure that the access platform is in position below the APU compartment.
(6) Make sure that the APU access doors are open (Ref. AMM TASK 52-41-00-010-001).
(7) Make sure that the LIGHT SW 11LJ is set to the ON position.

4. Procedure
Subtask 49-93-16-420-051-A ** ON A/C NOT FOR ALL

A. Installation of the Oil Level Switch
(1) Apply a thin layer of Synthetic base Lubricating Oil-Turbine Engine - - (Material No.03ABA1) or Synthetic base Lubricating Oil-Turbine Engine Low Temp. - (Material No.03ABB1) to the new AIPC 49-93-09-01-030 PACKING (3).
(2) Install the new packing (3) on the switch (2).
(3) Put the switch (2) into the filling port (5) and push it down.
(4) Rotate the switch to locate the lug under the screw (4).
(5) Tighten the screw (4).
(6) TORQUE the screw (4) to between 0.616 and 0.504 m.daN (54.51 and 44.60 lbf.in )

.
(7) Remove the CAP-BLANKING from each electrical connector and receptacle.
(8) Connect the electrical connector (1) to the switch (2).

Subtask 49-93-16-210-053-A ** ON A/C NOT FOR ALL

CAUTION: MAKE SURE THAT THE APU AIR INTAKE IS FULLY CLOSED TO MAKE SURE THAT THE SHUTDOWN OF THE APU WAS CORRECT. IF THE APU AIR INTAKE IS NOT FULLY CLOSED, OPERATE THE APU AT NO-LOAD FOR 5 MINUTES THEN DO A NORMAL SHUTDOWN.

B. Inspection Check

NOTE: Oil level inspection and servicing should be checked not less than 15 minutes after the last shutdown. Do not re-service before APU is operated again.

(1) Do a visual check of the oil quantity. Add oil if the oil level is on or less than ADD mark on the sight glass (Ref. AMM TASK 49-90-00-600-007).

Subtask 49-93-16-865-058-A ** ON A/C NOT FOR ALL

C. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s):

PANEL	DESIGNATION	FIN	LOCATION
** ON A/C NOT FOR ALL
121VU	APU/APU/CTL	2KD	L42
121VU	APU/ECB/SPLY	1KD	L41

Subtask 49-93-16-710-055-A ** ON A/C NOT FOR ALL

D. Do a check of the oil level switch by checking the Data/oil on the MCDU.

Subtask 49-93-16-710-053-A ** ON A/C NOT FOR ALL

E. Start and Operate the APU to do an Oil leak check.
(1) Start and operate the APU (Ref. AMM TASK 49-00-00-860-008).
(2) Allow the APU to run for 5 minutes.
(3) Shutdown the APU (Ref. AMM TASK 49-00-00-860-009).
(4) Do a leak check by a visual inspection of the oil quantity on the sight glass.

NOTE: No leaks are permitted.

5. Close-up
Subtask 49-93-16-410-052-A ** ON A/C NOT FOR ALL

A. Close Access
(1) Make sure that the work area is clean and clear of tools and other items.
(2) Set the LIGHT SW 11LJ to the OFF position.
(3) Close the APU access doors 315AL 316AR (Ref. AMM TASK 52-41-00-410-001).
(4) Remove the access platform(s).

Subtask 49-93-16-860-055-A ** ON A/C NOT FOR ALL

B. Aircraft Maintenance Configuration
(1) Put the related hydraulic system in the pressurized configuration (Ref. AMM TASK 29-00-00-864-001).
(2) De-energize the ground service network
(Ref. AMM TASK 24-42-00-862-001).
(3) Remove the WARNING NOTICE(S).

[Rev.10 from 2021] 2026.04.01 01:33:49 UTC