(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 SW 11LJ is set to the ON position.
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CES Subtask 49-26-54-865-051
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
_________
(Ref. Fig. 401/TASK 49-26-54-991-001) Subtask 49-26-54-420-050
A. Installation of the Air/Oil Separator Adapter
(1)
Lubricate the new packings (4, 5) and the seal (6) with OILS (Material No. 03-002).
(2)
Install the new packing (4) and the new packing (5) on the air/oil separator adapter (1).
(3)
Install the seal (6) and the shims (7) in the engine assy.
(4)
Install the air/oil separator adapter (1) to the engine assy with the bolts (2) and the washers (3).
(5)
TORQUE the bolts (2) to to 50 lbf.in (0.56 m.daN). Subtask 49-26-54-865-052
B.
Remove the safety clip(s) and the tag(s) and close this(these) circuit breaker(s): 1KD, 2KD.
Subtask 49-26-54-710-050
C. Test
(1)
Start the APU (Ref. TASK 49-00-00-860-008).
(2)
Stop the APU (Ref. TASK 49-00-00-860-009).
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CES
(3) Make an inspection of the air/oil adapter separator (1) for oil leaks.
NOTE : Leaks are not permitted.
____
________
5. Close-up
Subtask 49-26-54-410-050
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 SW 11LJ to the OFF position.
(3)
Close the APU access doors 315AL, 316AR (Ref. TASK 52-41-00-410-001).
(4)
Remove the access platform(s). Subtask 49-26-54-860-052
B.
Aircraft Maintenance Configuration
(1)
Pressurize the reservoirs of the hydraulic systems.
(Ref. TASK 29-14-00-614-002).
(2)
De-energize the ground service network
(Ref. TASK 24-42-00-862-001).
(3)
Remove the warning notice(s).
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CES ENGINE FUEL AND CONTROL - DESCRIPTION AND OPERATION
___________________________________________________
R **ON A/C 001-003, 051-099, 401-499,
1. General
_______
The APU-side fuel system meters and distributes the fuel it receives from
the A/C APU fuel supply system (Ref. 28-22-00).
Incoming fuel is received by the fuel control unit (FCU) and pumped to the
flow divider and drain valve assembly (FDDVA). From there it is ducted via
the fuel manifolds to the fuel nozzles.
A separate fuel circuit is provided to hydraulically operate the
IGV-actuator.
2. Component Location
__________________
(Ref. Fig. 001)
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA
| | | | DOOR | REF. -------------------------------------------------------------------------------4005KM2 FUEL CONTROL UNIT (FCU) 315 315AL 49-32-11 4005KM1 FLOW DIDIDER AND DRAIN VALVE 315 315AL 49-32-12
ASSEMBLY (FDDVA)
MANIFOLD - PRIMARY FUEL 315/ 315AL/ 49-31-41 316 316AR
MANIFOLD - SECONDARY FUEL 315/ 315AL/ 49-31-42 316 316AR
NOZZLES - PRIMARY FUEL 315/ 315AL/ 49-31-41 316 316AR
NOZZLES - SECONDARY FUEL 315/ 315AL/ 49-31-42 316 316AR
3. System Description
__________________
A. Fuel Distribution (Ref. 49-31-00) Incoming fuel from the A/C APU fuel supply system is received by the FCU. The FCU diverts some of the fuel into a hydraulic circuit to operate the IGV-actuator. Returned fuel from the IGV-actuator is routed back into the FCU fuel inlet. The FCU also pressurizes and meters the fuel destined for APU operation. The fuel is ducted via a supply line to the FDDVA, which distributes the fuel, depending on APU operating conditions, to the primary and/or secondary fuel manifold. These deliver the fuel to the 6 dual-orifice fuel nozzles, located around the circumference of the combustion chamber. There the fuel is atomized.
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