------------------------------------------------------------------------------
Storage
Period -------------- Preservation --------------------------- Return to Service-------------------------------------
One to Not Required None
45 days -------------- --------------------------- -------------------------------------
45 to Required De-preserve
120 days If preservation was not
performed: Replace FCU,
fuel flow divider, fuel
manifolds and pilot nozzles.
Check engine for free rotation
and that all air passages are
free of bird nests and other
debris. Drain and fill oil.
Operate engine for 0.5 hours
minimum and then drain the oil
-------------- --------------------------- and refill.-------------------------------------
120 to Required De-preserve
365 days If preservation was not
performed: Remove the APU
-------------- --------------------------- for shop visit.-------------------------------------
NOTE:
If desiccant is not
used:
Remove APU if storage
period is >180 days.
------------------------------------------------------------------------------more than N/A APU removal required. 365 days Subtask 49-20-00-860-077
B. Aircraft Maintenance Configuration.
(1)
Energize the aircraft electrical circuits (Ref. TASK 24-41-00-861-002).
(2)
On the panel 25VU, make sure that the APU MASTER SW p/bsw is Off.
(3)
Put a warning notice in the cockpit to tell persons not to start the APU.
(4)
Make sure that the hydraulic systems are depressurized (Ref. TASK 29-00-00-864-001).
Subtask 49-20-00-865-086
C. Open, safety and tag this(these) circuit breaker(s):
-------------------------------------------------------------------------------PANEL DESIGNATION IDENT. LOCATION -------------------------------------------------------------------------------121VU APU/APU/CTL 2KD L42 121VU APU/ECB/SPLY 1KD L41
Subtask 49-20-00-010-067
D. Get Access
(1)
Put the access platform in position below the APU access doors 315AL and 316AR.
(2)
Open the access doors 315AL and 316AR (Ref. TASK 52-41-00-010-001).
(3)
Set the LIGHT control SW 11LJ to the On position.
4. Procedure
_________ Subtask 49-20-00-620-057
A. APU Preservation
(1) Oil system procedure
(a) Do the oil change procedure (Ref. TASK 49-90-00-600-005)
-service the oil tank with a mixture of approved APU Engine Oil OILS (Material No. 03-003) and 7 percent (by volume) corrosion preventive additive (Material No. CP5075).
- or with a mixture of approved APU Engine Oil OILS (Material No. 03-003) and 5 percent (by volume) lube system corrosion preventive oil (Material CP5067).
(b) Run the APU for 5 minutes (Ref. TASK 49-00-00-860-005) and (Ref. TASK 49-00-00-860-006).
(2) Fuel System Procedure
(a) Disconnection of fuel supply CAUTION : DO NOT PUT HYDROCARBON FUEL(S)/OIL(S) INTO THE ENGINE
_______
COMPRESSOR. THEY CAN BURN SUDDENLY AND DAMAGE THE APU.
1_ Disconnect the fuel pump inlet tube from the fuel control unit
(FCU) (Ref. TASK 49-32-11-000-002).
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