F.  Do the deactivation of the air inlet door (Fig. 802):
(1)  
FOR THE C49001 TOOL KIT; If the inlet door actuator was removed from the airplane and the door lock bracket installed, do these steps:

(a)  
Disconnect the pushrods from the actuator arms.

(b)  
Remove the spacers from the pushrods.

(c)  
Remove the bolts and washers from the actuator arms.

(d)  
Remove the actuator arms from the door lock bracket.

(e)  
Remove the bolts, nuts and washers that attach the door lock bracket to the mounting bracket for the inlet door actuator.

(f)  
Remove the door lock bracket.

(g)  
Remove the braid that holds the electrical connector for the inlet door actuator to the airplane structure.

(h)  
Install the inlet door actuator (Ref 49-15-31 R/I).

(2)  
If the inlet door actuator was not removed from the airplane,
Do these steps:

(a)  
FOR THE C49001 TOOL KIT; Remove the cap assembly from the electrical connector and electrical receptacle for the inlet door actuator.

(b)  
FOR THE F80136 TOOL KIT; Do these steps: 1) Remove the cap chain from the receptacle attachment screw. 2) Remove the cap from the actuator electrical receptacle. 3) Remove the electrical harness with the cap chain from the airplane structure. 4) Remove the cap from the electrical connector for the inlet door actuator.

(3)  
Connect the electrical connector to the inlet door actuator.

G.  Remove cap from fuel inlet line and connect fuel inlet hose (Fig. 804).
H.  Remove cap from pneumatic sensing line in upper shroud.
I.  Remove caps from following electrical receptacles:
(1)  
Starter motor

(2) 
 Generator

(3) 
 Generator control

(4) 
 EGT Indicating

(5) 
 Fire detection

(6)  
APU control

J.  Remove dummy plug assembly from APU control receptacle on APU shroud.
501 
49-11-0 Page 814  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  Feb 20/93 

K.  Do the activation of the APU fuel shutoff valve found on left rear spar in wheel well (Fig. 801):
(1)  
FOR THE C49001 TOOL KIT; Remove the cap assembly from the electrical connector and electrical receptacle for the APU fuel shutoff valve.

(2)  
FOR THE F80136 TOOL KIT;
Do these steps:

(a)  
Remove the cap chain from the receptacle attachment screw.

(b)  
Remove the cap from the electrical receptacle of the APU fuel shutoff valve.

(c)  
Remove the electrical harness with the cap chain from the airplane structure.

(d)  
Remove the cap from the electrical connector for the APU fuel shutoff valve.

(3)  
Connect the electrical connector to the APU fuel shutoff valve.

L.  Install APU (Ref 49-11-0 R/I).
501 
Feb 20/93  BOEING PROPRIETARY - Copyright . - Unpublished Work - See title page for details.  49-11-0 Page 815 

APU SHROUD - DESCRIPTION AND OPERATION
1. General (Fig. 1)
A.  The APU power plant is completely enclosed in a titanium shroud to provide a fireproof and sound reducing enclosure for the unit. The shroud consists of the upper shroud and lower shroud. The upper shroud supports the forward (floating) end of the exhaust duct. Both shrouds mate with a seal on the turbine section aft flange. The seal separates the exhaust duct cooling system from the APU (accessory) cooling air system.
2.  Upper Shroud (Fig. 1)
A.  The upper shroud encloses the upper half of the APU engine. The upper shroud is attached to the shroud rings; the shroud rings are attached to the APU compartment structure with eight ring mounts. The upper shroud remains on the airplane when the APU engine is removed. The upper shroud provides cutouts for the fuel line, the compressor air inlet duct, the accessory cooling air duct, and bleed air duct. The shroud is fitted with electrical and plumbing quick disconnects. Three mount brackets for the APU engine are attached to the shroud rings. A fuel heater is attached to the inside surface of the shroud.
3.  Lower Shroud (Fig. 1)
A.  The lower shroud encloses the lower half of the engine, the combustion chamber, and the oil tank. The lower shroud is attached to the upper shroud with eight latches. The shroud provides cutouts for the oil tank filler port and the accessory cooling air overboard exhaust. Also provided is a removable access panel for reading the elapsed time indicator. When the shroud is removed, access is obtained to the control thermostat, EGT probe, overtemperature control thermocouple, combustor unit, fuel line, igniter plug, ignition unit, oil tank, oil quantity transmitter, oil lines, ac electrical generator, cooling air fan, fuel control unit, tachometer generator, starter motor, and the oil pump.
　
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