-when the air intake flap actuator reaches its end position 'extended' (flap in 'CLOSED'-position), a 'FLAP CLOSED'-signal is transmitted back to the ECB.
 -the APU MAIN relay de-energizes,
 -electrical power is disconnected from the ECB.
 D. Indications (Ref. 49-70-00)
 (1)
 If the air intake flap does not move to the fully open position within 30s, a Class 1 Fault will occur. APU AUTO SHUT DOWN occurs and the subsequent indications are given:

 (a)
 a continuous amber FAULT legend in the MASTER SW.

 (b)
 Glareshield panel 131VU (130VU) MASTER CAUT annunciator lights:

 -steady amber MASTER CAUT annunciator lights,
 -single chime.

 (c)
 On the ECAM upper display unit:

 -an amber caution 'APU AUTO SHUT DOWN - MASTER SW OFF' shows on the lower part of the Engine/Warning page,
 -INOP SYS - APU is shown on the ECAM status page,
 -no APU AVAIL indication is given on the ECAM lower display unit.

 (2)
 When an APU EMERGENCY SHUT DOWN occurs on the ground (because an APU EMERGENCY STOP ground signal has been received by the ECB 59KD), indications are given on:

 (a)
 MASTER SW 14KD on panel 25VU:

 -continuous amber FAULT legend in the switch.

 (b)
 Glareshield panel 131VU (130VU) MASTER CAUT annunciator lights:

 -steady amber MASTER CAUT attention getters,
 -single chime.

 (3)
 When the air intake flap does not fully close within 30s, a message indication is given on: ECAM Status Page (lower right corner):

 -APU (indicates that a Class 2 Fault has occurred and is kept in the BITE Memory of the ECB 59KD).
 E. ECB 59KD BITE Memory The BITE system of the ECB 59KD records all the system faults in the BITE memory. Access to these is through the Centralized Fault Display System (CFDS) (Ref. 49-73-00).

 AIR INTAKE SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________
 1. General
_______
 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 gas (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 DIFFUSER - AIR DUCT 315/ 315AL/ 49-16-45 316 316AR ELBOW - AIR DUCT 315/ 315AL/ 49-16-45 316 316AR

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-16-00Page 1 201-210, Config-2 Aug 01/05
 CES

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

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-16-00Page 2 201-210, Config-2 Aug 01/05
 CES

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

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-16-00Page 3 201-210, Config-2 Aug 01/05
 CES  3. System Description

__________________
 (Ref. Fig. 001)

 A. Fixed Diverter The diverter which is installed just forward of the tailcone on 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.
　
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