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B. At the aft end of the lower shroud, a drain cup with a standpipe collects all the extra fuel that comes out of the turbine exhaust port. A different drain cup on the lower shroud connects with the fuel drain on the APU engine. This drain cup helps remove the extra fuel from the combustion chamber that is not burned during the APU operation. Both of the drain cups are connected to the drain lines on the lower shroud. These drain lines flow to the drain reservoir and a shroud drain on the forward end of the lower shroud. A different shroud drain is found on the forward end of the lower shroud. This shroud drain removes the fuel and the oil that leaks from the APU engine directly on the lower shroud. Both of these shroud drains connect to separate drain cups on the APU cowl door. For a description of the APU cowl door, refer to AMM 52-48-21/001.
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UPPER SHROUD - REMOVAL/INSTALLATION
___________________________________
1. General
_______
A. This procedure gives the steps to remove and to install the upper shroud. The upper shroud is in the APU compartment. You must remove the APU power plant to remove the upper shroud.
TASK 49-12-31-004-001
2. Upper Shroud Removal (Fig. 401)
____________________
A. References
(1)
AMM 49-11-00/401, APU Power Plant
(2)
AMM 49-31-61/401, Fuel Heater
(3)
AMM 49-51-21/401, Cooling Air Shutoff Valve
B. Access
(1)
Location Zones
101 Control Cabin (Left)
205 Electronic Compartment
701 Tail Compartment
703 APU Compartment
(2)
Access Panels
1201 Electronic Equipment Access Door
3701 Stabilizer Trim Access Door
3804 APU Cowl Door
C. Procedure
S 864-002
(1)
Put the horizontal stabilizer trim in the fully up position (airplane nose down).
S 864-021
(2)
Open this circuit breaker and attach a DO-NOT-CLOSE tag:
(a) P6-2 Load Control Center Assembly
1) STABILIZER TRIM, CONT
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////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
SEE A
EGT RECEPTACLE,D1102J
AIR LINE FITTING ETC RECEPTACLE, FOR THE BLEED D10140 LOAD CONTROL
1
BLEED
STARTER MOTOR AIR DUCT
RECEPTACLE, D4802J GENERATOR CONTROLCOUPLING FOR RECEPTACLE, D4804J
THE BLEED
AIR DUCT
RECEPTACLE FOR THE APU ELECTRICAL UPPER SHROUD GENERATOR, D4800J
SEE B RECEPTACLE FOR THE APU HARNESS, D452FUEL HEATER
ENGINE MOUNTING BRACKET BLEED AIR VALVE AND VIBRATION ISOLATOR BONDING JUMPER
LOCK HANDLE SEE C
BONDING JUMPER CONTROL VALVE FOR
SEE D
THE FUEL SENSING FLOW DUCT FLANGE FOR THE
FIRE EXTINGUISHERACCESSORY COOLING AIR
LINE FITTING FUEL HOSE FADEC RECEPTACLES,
FUEL LINE
D10434 AND D10436
SHROUD
(IF INSTALLED)
FWD FIRE DETECTOR RECEPTACLE, D4816J
A
1 AIRPLANES WITH THE ETC
Upper Shroud Installation Figure 401 (Sheet 1)
A42641
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