C. Referenced Information
-------------------------------------------------------------------------------REFERENCE DESIGNATION -------------------------------------------------------------------------------
24-41-00-862-002 De-energize the Aircraft Electrical Circuits Supplied from the External Power 24-42-00-861-001 Energize the Ground Service Network 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 49-00-00-710-004 Operational Test of the APU (4005KM) (GTCP 36-300) 52-41-00-010-001 Open the APU Doors for Access 52-41-00-410-001 Close the APU Doors after Access 49-91-44-991-002 Fig. 402
3. Job Set-up
__________
Subtask 49-91-44-860-060
A. Aircraft Maintenance Configuration
(1)
Energize the ground service network
(Ref. 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 hydraulic systems are depressurized
(Ref. TASK 29-00-00-864-001).
Subtask 49-91-44-865-059
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
Subtask 49-91-44-010-061
C. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the APU access doors 315AL and 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT SW 11LJ to the ON position.
4. Procedure
_________
(Ref. Fig. 402/TASK 49-91-44-991-002) Subtask 49-91-44-420-053
A. Installation of the Thermal By-Pass Valve
(1)
Remove the blanking caps/plugs from the oil tubes, the oil cooler and the thermal by-pass valve.
(2)
Apply a thin layer of lubricant OILS (Material No. 03-002) to the new packing (5)
(3)
Position the new packing (5), one in each of the two recesses in the thermal by-pass valve (6).
(4)
Locate the thermal by-pass valve (6) on the oil cooler (4), secure with washers (7) and bolts (8) treated with a thin film of COMMON GREASE (Material No. 04-014).
(5)
Apply a thin layer of lubricant to the new packing (1)
(6)
Locate the packings (1), one on each of the oil tubes (9).
(7)
Install the oil tubes (9) in the thermal by-pass valve (6).
(8)
Position the tube retainer (2) on the thermal by-pass valve (6) and secure with bolts (3).
(9)
Torque the bolts (3) to between 25 and 30 lbf.in (0.28 and 0.33 m.daN).
Subtask 49-91-44-865-060
B. Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
Subtask 49-91-44-710-052
C. Do the operational test of the APU (Ref. TASK 49-00-00-710-004).
(1) Examine the fan outlet duct (16), oil cooler (5) and outlet duct (8) for oil leaks.
NOTE : No leaks are permitted.
____
________
5. Close-up
Subtask 49-91-44-410-054
A. Close Access
(1)
Make sure that the work area is clean and clear of tool(s) and other items.
(2)
Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).
(3)
Remove the access platform(s). Subtask 49-91-44-860-059
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
___________________________________ TASK 49-91-44-000-004 Removal of the Oil Cooler (8079KM) (131-9(A)) WARNING : DO NOT TOUCH THE APU UNTIL IT IS SUFFICIENTLY COOL TO PREVENT BURNS
_______ WHEN YOU DO THE MAINTENANCE TASK(S).
1.
Reason for the Job
__________________
Self Explanatory
2.
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