D. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-861-002 Energize the Aircraft Electrical Circuits from the External Power 24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 29-00-00-864-001 Put the Related Hydraulic System in the Depressurized Configuration before Maintenance Action 29-14-00-614-002 Pressurization of the Hydraulic Reservoirs through
the Ground Connector 49-00-00-710-008 Operational Test of the APU (APS 3200) 49-90-00-600-004 Check Oil Level and Replenish (APS 3200) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-91-43-991-002 Fig. 401
3. Job Set-up
__________
Subtask 49-91-43-860-052
A. Aircraft Maintenance Configuration
(1)
Make sure that the aircraft electrical circuits are energized (Ref. TASK 24-41-00-861-002).
(2)
On the panel 25VU, make sure that the APU MASTER SW pushbutton switch 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 hydraulic systems are depressurized
(Ref. 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. TASK 52-41-00-010-001).
(7)
Make sure that the LIGHT control switch 11LJ is set to the on position.
Subtask 49-91-43-865-058
B. Make sure that this(these) circuit breaker(s) is(are) open, safetied and tagged
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
4. Procedure
_________ Subtask 49-91-43-420-052
A. Installation of the Pressure Relief Valve
(Ref. Fig. 401/TASK 49-91-43-991-002)
(1)
Apply COMMON GREASE (Material No. 04-012) to the new packing (1) and the new packing (2).
(2)
Install the new packings (1) and (2) on the pressure relief valve (3).
(3)
Install the pressure relief valve (3) on the APU gearbox.
(4)
TORQUE the pressure relief valve (3) to between 55.0 and 75.0 lbf.in
(0.62 and 0.84 m.daN).
(5)
Safety the pressure relief valve (3) with MISCELLANEOUS (Material No. 19-010).
(6)
Fill the APU oil reservoir (Ref. TASK 49-90-00-600-004). Subtask 49-91-43-865-059
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD
Subtask 49-91-43-790-052
C. Leak Test of the Pressure Relief Valve
(Ref. Fig. 401/TASK 49-91-43-991-002)
(1) Start and operate the APU (Ref. TASK 49-00-00-710-008) for min. 5 minutes.
(a) Examine the joint of the pressure relief valve (3) and the APU for leaks.
NOTE : Leaks are not permitted.
____
(2) Stop the APU (Ref. TASK 49-00-00-710-008).
5. Close-up
________ Subtask 49-91-43-410-052
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Set the LIGHT control switch 11LJ to the off position.
(3)
Close the APU access doors 315AL and 316AR (Ref. TASK 52-41-00-410-001).
(4)
Remove the access platform(s). Subtask 49-91-43-860-053
B.
Aircraft Maintenance Configuration
(1)
Pressurize the reservoirs of the hydraulic systems.
(Ref. TASK 29-14-00-614-002).
(2)
De-energize the aircraft electrical circuits
(Ref. TASK 24-41-00-862-002).
(3)
Remove the warning notice(s).
COOLER - OIL - REMOVAL/INSTALLATION
___________________________________
R **ON A/C 001-003, 051-099, 401-499,
TASK 49-91-44-000-001 Removal of the Oil Cooler (8079KM) (GTCP 36-300) WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
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