-
at the cut-outs on the rear firewall (FR84),

 -
where the fuel lines enter the APU compartment,

 -
where the air ducts enter the APU compartment,

 -
where the electrical harness enters the compartment,

 -
where the exhaust muffler goes out of the compartment.
 The gaskets give the APU compartment a fireproof seal. A drain mast,
 installed on the right access door, removes the fluids from the compartment.
 It prevents the risk of a flow back of fluids into the compartment.

 Fire Seals - Component Location
 Figure 001

 CES  The APU exhaust is installed externally of the fire zone (FR84 to the end of the tailcone). Two fire seals installed around the exhaust muffler, give protection against the risk of a fire in the exhaust compartment. The front fire seal is installed around the exhaust muffler at FR84. The rear fire seal is installed in the end cover of the exhaust muffler compartment. The rear fire seal prevents an opposite flow of the exhaust gases from the APU. This prevents a subsequent overheat condition in the exhaust muffler. The compartment is ventilated through two louvers.

 AIR INTAKE SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________

R **ON A/C 001-003, 051-099, 401-499,
 1. General
_______ (Ref. Fig. 001) The air intake system provides ambient air of sufficient quantity and quality to the APU. Its major components are:
 -diverter;
 -
air inlet (including actuator-driven flap);

 -
air duct.
 The main function of the air intake system is:

 -provide sufficient mass flow to the APU plenum chamber,
 -minimization of pressure loss and flow distortion (thus also reducing the danger of APU surge),
 -noise reduction,
 -reduce the potential for foreign object ingestion;
 -
prevent exhaust (from APU and main engines) from re-entering the inlet,

 -
prevent the ingestion of fluids existing externally,

 -
prevent the accumulation of flammable fluids in the intake system.

 2. Component Location
__________________
 (Ref. Fig. 001)

 -------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF. -------------------------------------------------------------------------------DIVERTER - FIXED 311/ 314AR 49-16-41 312 AIR INLET 313/ 314AR 49-16-42 314 FLAP - AIR INLET 313/ 314AR 49-16-43 314 NOSE - AIR INLET 313/ 314AR 49-16-44 314 4015KM ACTUATOR - AIR INLET FLAP 313/ 314AR 49-16-51 314 AIR DUCT 315/ 315AL/ 49-16-45 316 316AR DIFFUSOR - AIR DUCT 315/ 315AL/ 49-16-45 316 316AR ELBOW - AIR DUCT 315/ 315AL/ 49-16-45 316 316AR

 Air Intake System - Component Location Figure 001 (SHEET 1)

R EFF : 001-003, 051-099, 401-499, 49-16-00Page 2 Config-1 Aug 01/05
 CES

 Air Intake System - Component Location Figure 001 (SHEET 2)

R EFF : 001-003, 051-099, 401-499, 49-16-00Page 3 Config-1 Aug 01/05
 CES  3. System Description

__________________
 (Ref. Fig. 001)

 A. Fixed Diverter This item, being installed just forward of the tailcone at the bottom the rear fuselage, serves two purposes:
 (1)
 Its primary purpose is to improve the ram air recovery during in-flight APU operation. This is accomplished by positioning the inlet some 50mm into the airstream, thus the lowest energy portion of the aerodynamic boundary layer is prevented from entering the air inlet.

 (2)
 Its secondary purpose is to divert any fluids (such as oil, hydraulic or de-icing fluid, fuel or water), which might be migrating aft along the fuselage during flight. They are thus prevented from entering the air inlet.

 B. Air Inlet The air inlet assembly is installed as a unit in a cutout in the bottom of the tailcone just forward of the APU compartment, positioned by 4 bolts. The interface to the air duct is attached to the APU compartment forward firewall. The inlet airstream area up to approximately 150mm (6in) forward of the interface to the APU compartment is covered with a CRES face sheet to serve as an extension of the APU compartment fireproof area. A fireproof gasket is used to join the air inlet assembly to the APU compartment firewall.

R **ON A/C 001-003, 051-099,
 The air inlet consists of the following major components:
 (1)
 Air Inlet Body This is essentially a U-shaped component, forming both side walls as well as the the rear portion of the upper wall. It is of a fiberglass fabric/aluminum core sandwich design. The upper wall is acoustically treated with feltmetal. Rails, which extend into the airstream, are incorporated along the side walls in order to prevent the ingression of fluids flowing along the tailcone outer surface.
　
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