INDICATING - DESCRIPTION AND OPERATION
______________________________________
 1.
 General

_______ The indicating system monitors the APU speed and the Exhaust Gas Temperature (EGT). You can also see on the Multipurpose Control & Display Unit (MCDU) the unservicable LRUs and test results for the APU system.

 2.
 System Description

__________________
 (Ref. Fig. 001)

 A. Power Indicating The power indicating system monitors the APU speed in revolutions per minute (rpm). One dual speed sensor transmits two signals to the ECB 59KD. The ECB 59KD gives the speed signal to the Electronic Instrument System (EIS). The EIS shows the APU speed in percent on the APU system page at the ECAM lower display unit.
 B. Temperature Indicating The temperature indicating system monitors the APU Exhaust Gas Temperature (EGT). Two rakes, each with two thermocouples, transmit a signal to the ECB 59KD. The ECB 59KD gives an EGT signal to the Electronic Instrument System (EIS). The EIS shows on the APU page at the lower ECAM display unit the APU EGT in DEG. C.
 C. Built-In Test Equipment (BITE) The Electronic Control Box (ECB) 59KD has a Built-In Test Equipment (BITE) task. This is a function which provides fault detection, component protection, fault information and repair verification for the APU and the ECB itself. The ECB performs the BITE task in three routines:
 -
the Power Up Test (PUT),

 -
the In Operation Test (IOT),

 -
the Self Test (SET).

 -Ground Scanning
 The ECB transmits the data to the Centralized Fault Display-System (CFDS) (Ref. 31-30-00), if selected on the Multipurpose Control and Display Units (MCDUs) which are the interface for selection and indication of the data.
 D. APU Life Data You can also select the APU life data on the MCDUs for indication. The ECB has logics for statistics used for health monitoring and life data of the APU:
 -
APU serial number,

 -
APU operating hours,

 -
APU cycles, among other specific APU data.

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-70-00Page 1 201-210, Config-2 Aug 01/05
 CES

 ECAM Display Units Figure 001 
R  EFF : 001-049, 101-105, 107-107, 151-199, 201-210,  Page 249-70-00Config-2 Aug 01/05
 CES 

 The APU life data are stored in the ECB, the Data Memory Module and partially in the DMU (Ref. 31-00-00). The APU serial number plus all other operational APU life data are stored in the DMM, which is installed on the APU.
 E. System Display During usual operation, the APU system page is shown (on the lower display unit of the ECAM) in one of these modes:
 -
the manual mode,

 -
the flight phase related mode,

 -
the advisory automatic mode,

 -
the failure related automatic mode.

 (1)
 Manual Mode In the manual mode, operation of the APU button (on the ECAM control panel 11VU on the pedestal) shows the APU system page (on the lower display unit) on the ECAM.

 (2)
 Flight Phase Related Mode The flight phase related mode operates, when the other modes are not set. The ECAM system shows the system page related to the applicable flight phase the aircraft is in. The APU system page is shown when these conditions are applicable:

 -
the aircraft is in the flight phase 1 or phase 2,

 -
the MASTER SW 14KD is set to the ON position.
 The APU system page will stay on unless it is cancelled by another
 mode until:

 -
the APU speed is more than 95 % for 15 s.

 -
the MASTER SW 14KD is set to OFF.

 (3)
 Advisory Automatic Mode
 The advisory automatic mode operates when one of the following
 conditions occurs:

 -the APU operates and the EGT is less than 50 deg.F (9.99 deg.C) from the overtemperature schedule,
 -a LOW OIL LEVEL is detected,
 The related indication flashes for as long as the condition exists.

 (4)
 Failure Related Automatic Mode The failure related automatic mode, automatically shows the system page, when the operation limit is at a warning level. It also gives a warning message on the upper ECAM display unit (engine/warning page).

R  EFF : 001-049, 101-105, 107-107, 151-199, 49-70-00Page 3 201-210, Config-2 Aug 01/05
 CES

 F. Indications of Operating Parameters The operating parameters of the APU are shown on the APU system display page of the ECAM. The parameters shown are:
　
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