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 (3) SYSTEM TEST The RA SYSTEM TEST function can be activated by pressing the line key adjacent to the corresponding indication on the RA 1(2) maintenance sub-menu. The following sequence occurs : - on the PFD :
 *
 the bottom sector line moves down from the horizon line.

 *
 the radio altimeter is 40 ft.

 - on the MCDU, at the end of the test, the TEST OK message comes into view.
 NOTE : During the test :
____
 -
You can hear auto call-out announcements 40, 41 or 42

 -
You must open the RA1 circuit breaker to hear auto call-out announcements during the RA2 SYSTEM TEST.

 NOTE : If the system test or the ramp test cannot be initiated on
____ ground from the MCDU (which means that a fault affects either the LGCIU, the EIU or the RA) a TEST page comes into view on the MCDU. (Ref. Fig. 009, 010, 011)
 **ON A/C ALL
 C. Power-up Tests Initialization and Cockpit Repercussions
 (1)
 Conditions of power-up tests initialization

 -How long the computer must be de-energized: 2 s.
 -A/C configuration:
 -whatever the A/C configuration on ground

 (2)
 Progress of power-up tests

 -Duration: 3 s.
 -Cockpit repercussions directly linked to power-up test accomplishment (some other repercussions may occur depending on the A/C configuration but these can be disregarded):
 -MASTER CAUT light on

 (3)
 Results of power-up tests (cockpit repercussions, if any, in case of tests pass/tests failed).

 -
Tests pass:

 -MASTER CAUT light off

 -
Tests failed:

 -MASTER CAUT light on
 -ECAM warning
 NAV RA 1 or 2 FAULT

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 RA Maintenance Test Procedure - Access to Sub-menus 4/6 Figure 009
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 RA Maintenance Test Procedure - Access to Sub-menus 5/6 Figure 010
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 RA Maintenance Test Procedure - Access to Sub-menus 6/6
 Figure 011

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 -ECAM STATUS
 RA 1 or 2 INOP

 **ON A/C 001-004,
 Post SB 34-1171 For A/C 001-004,
 D. CFDIU Interface
 (Ref. Fig. 002)

 (1) BITE description The BITE facilitates maintenance on in-service aircraft. It detects and identifies a failure related to the RA system. The BITE of the radio altimeter is connected to the CFDIU (Ref. 31-32-00). The BITE:
 -transmits permanently RA system status and its identification message to the CFDIU
 -memorizes the failures which occurred during the last 63 flight legs
 -monitors data inputs from the various peripherals
 -transmits to the CFDIU the result of the tests performed and selt-tests
 -can communicate with the CFDIU through the menus. The BITE can operate in two modes:
 -
the normal mode

 -
the menu mode.

 (a)
 Normal mode During the normal mode the BITE monitors cyclically the status of the RA system. It transmits its information to the CFDIU during the concerned flight. In case of fault detection the BITE stores the information in the fault memories. These items of information are transmitted to the CFDIU by an ARINC 429 message with label 356.

 (b)
 Menu mode The menu mode can only be activated on the ground. This mode enables communication between the CFDIU and the RA BITE by means of the MCDU. (Ref. Fig. 008A) All the information displayed on the MCDU during the BITE Test configuration can be printed by the printer (Ref. 31-35-00). The RA menu mode is composed of:

 -LAST LEG REPORT
 (Ref. Fig. 012)

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 RA Maintenance Test Procedure - Access to Sub-menus 1/6 Figure 012
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 This menu contains the fault messages (class 1 and 2, internal and external) detected during the last flight.
 -PREVIOUS LEGS REPORT
 (Ref. Fig. 012) This report contains the fault messages related to the external or internal failures (class 1 and 2) recorded during the previous 63 flight legs.
 -LRU IDENTIFICATION
 (Ref. Fig. 012) Allows to display the P/N, the S/N and the SW/N of the equipment.
 -GND SCANNING
 (Ref. Fig. 013) Based on the monitoring and fault analysis during flight, provides information of the failures detected while using this function.
　
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