(a)  
Install the cap to the mount bracket with the bolt, washers and nut.

 (b)  
Install the cotter pin in the bolt.

 (c)  
Close the mount cap and install the bolts, washers, and nuts.

 S 424-012
 (2)  If you removed the mount bracket with the cap from the APU engine, do these steps:
 (a)  
Install the mount bracket to the APU engine with the bolts and washers.

 (b)  
Tighten the bolts for the mount bracket to 18-34 pound-feet (25-46 newton-meters).

 S 414-008
 (3)  Install the APU power plant (AMM 49-11-00/401).
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 49-13-11
 ALL  ú ú 01 Page 410 ú Jul 15/96
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
APU AIR INLET - DESCRIPTION AND OPERATION
_________________________________________
 1.  General
_______
 A.  The air inlet system for the APU supplies the air for the APU. The air inlet system has the air inlet ducts, vortex generator, air inlet door, and the actuator for the air inlet door. The vortex generator and air inlet door are found on the right side of the fuselage. They are forward of the APU. The inlet air goes through the air inlet ducts to the APU compressor plenum and cooling fan.
 2.  Air Inlet Ducts (Fig. 1)
_______________
 A.  The air inlet ducts supply stable air to the APU while the airplane is on the ground. When the airplane is in flight, the air inlet ducts supply ram air to the APU. The air inlet ducts include:
 (1)
the air diffuser duct

 (2)
the compressor air duct

 (3)
the cooling air duct.

 B.  The air diffuser duct is found in the fuselage behind the rear pressure bulkhead on the right side of the airplane. The forward end of the air diffuser duct attaches to the fuselage near the air inlet door. The aft end of the air diffuser duct connects to the torque box liner on the right side of the airplane. The torque box liner operates as an air collector. From the torque box liner, the air supply goes into two ducts. These two ducts are the compressor air duct and the cooling air duct. These air ducts are connected to the torque box liner. The compressor air duct attaches to the flange of the APU compressor plenum. For a description of the cooling air duct, refer to AMM 49-51-00/001.
 C.  The torque box liner has acoustically treated panels. One panel is the splitter panel. These panels keep the APU compressor noise to a minimum during ground operations. The acoustically treated panels are made from a sandwich type construction with a honeycomb bonded material. These panels attach to the inner wall of the torque box liner with a bonding material and rivets.
 3.  Air Inlet Door (Fig. 1)
______________
 A.  The air inlet door controls the air supply to the APU. The air inlet door is found on the right side of the fuselage in front of the right horizontal stabilizer. A vortex generator is found on the surface of the air inlet door. The vortex generator supplies an increase in ram air flow to the air diffuser duct during flight. The air inlet door operates with two pushrods and an actuator. The actuator is an electrical unit. The air inlet door does not fully close. This permits the inlet air pressure to always be more than the tailpipe pressure.
 EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. ú

 49-15-00
 ALL  ú ú 01 Page 1 ú Mar 15/92
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
////////////////////////A / GTCP85-129 SERIES /737-300/400/500/ ENGINES /MAINTENANCE MANUAL ////////////////////////
COMPRESSOR 
AIR DUCT 
AIR  SEE  A 
DIFFUSER 
DUCT 
SEE  B 
COOLING 
AIR DUCT  VORTEX 
GENERATOR 
AIR INLET 
DOOR 
FWD 
A 
PRESSURE 
BULKHEAD  ACTUATOR 
ARM 
AIR INLET 
DOOR 
AIR 
　
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