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RELAY 11GB (No. 1 SYS) SI ATA FUNCTION -------------------------------------------------------------------------------FN 3421 STBY ALTITUDE AND AIRSPEED QT 2842 FUEL QTY IND WT 3168 EIS
-------------------------------------------------------------------------------
RELAY 12GB (No. 2 SYS) SI ATA FUNCTION -------------------------------------------------------------------------------MJ 5235 CARGO COMPARTMENT DOOR ELECTRICAL CONTROL SYSTEM RK 2371 COCKPIT VOICE RECORDER
The landing-gear control-lever (6GA) controls the systems that follow:
-------------------------------------------------------------------------------SI ATA FUNCTION -------------------------------------------------------------------------------QT 2842 FUEL QUANTITY IND DOWN SWITCH CONTACTS GG 3242 NORMAL BRAKES UP SWITCH CONTACTS
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LANDING GEAR - BITE - DESCRIPTION AND OPERATION
_______________________________________________
1. General_______ The L/G control system has two Landing Gear Control and Interface Units (LGCIU) (5GA1/5GA2). Each LGCIU has hardware and software to:
-continuously monitor the LGCIU/system for failures
-keep the failure data and also send this data to the other systems in the aircraft
-do a BITE test
-simulate the different positions of all (of) the L/G
-do the system tests during ground maintenance.
The LGCIU supplies data to the Centralized Fault Display System (CFDS)
(Ref.31-30-00). The CFDS, which is a maintenance aid system, has these
components:
-the Centralized Fault Display and Interface Unit (CFDIU) (ITW)
-two Multifunction Control and Display Units (MCDU) (3CA1/3CA2).
The ARINC 429 input and output busses connect the LGCIU to the CFDIU. The CFDIU is the interface between the LGCIU and the MCDUs. Each MCDU, when set to the interactive mode, lets the maintenance technicians:
-read the fault data kept in the Non Volatile Random Access Memory (NOVOL RAM) of the LGCIU
-start the BITE test
-set the L/G simulation mode.
2. Component Location__________________
-------------------------------------------------------------------------------FIN | FUNCTIONAL DESIGNATION | PANEL|ZONE|ACCESS | ATA | | | | DOOR | REF.
-------------------------------------------------------------------------------5GA1 LGCIU-1 93VU 121 811 32-31-71 5GA2 LGCIU-2 94VU 122 811 32-31-71
3. System Description__________________
A. Failure Monitoring
The failure monitoring software operates continuously after the completion of the power-up and the initialization. It does not have an effect on the operation of the LGCIU.
The software monitors the:
-
L/G proximity-sensor inputs
-
L/G control-lever inputs
-electrical power supplies
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-L/G control-logic (discretes)
-ARINC 429 tranceiver inputs and outputs
-NOVOL RAM.
R (1) Hardware Monitor
The software monitors the hardware every 100 milliseconds, for specified failure conditions (Ref. Table 3). To do this, the software compares the hardware signal values and examines the hardware indicators.
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