DOC AIRBUS | AMM A320FPOSITION AND WARNING - DESCRIPTION AND OPERATION
** ON A/C NOT FOR ALL
** ON A/C NOT FOR ALL
1. General
The Position and Warning sub-system has two parts which are:
Landing Gear and Doors Indication and WarningsThe Position and Warning sub-system has two parts which are:
- Indicating and Warning (Ref. AMM D/O 32-61-00-00)
- L/G Built-in Test Equipment (BITE) (Ref. AMM D/O 32-69-00-00).
A. Indicating and Warning
The proximity sensors on the L/G and L/G doors give position data to the two Landing Gear Control and Interface Units (LGCIUs) (Ref. AMM D/O 32-31-00-00). There are two sets of proximity sensors. The sensors in System 1 supply data to LGCIU 1 and the sensors in System 2 supply data to LGCIU 2. Each LGCIU sends the position data to the Electronic Instrument System (EIS) (Ref. AMM D/O 31-60-00-00). The EIS includes the Engine/Warning Display (EWD) (Ref. AMM D/O 31-66-00-00) and the System Display (SD). Together these make the Electronic Centralized Aircraft Monitoring (ECAM).
The position of each L/G and L/G door shows on the WHEEL page of the SD. If specified failures (or incorrect L/G configurations) occur, the E/WD gives a warning or caution message. Also, the Master Warning, or Caution lights, come on and an aural warning operates (Ref. AMM D/O 31-50-00-00).
The downlock indicator lights also show the position of each L/G (but not the L/G doors). The downlock indicator lights for the MLG and NLG are independently supplied through LGCIU 1.
Position information is described in Landing Gear Position Information (Ref. AMM D/O 32-62-00-00).
The LGCIU's supply L/G position data to other aircraft systems. Two types of data are given. These are:
The discrete outputs are sent when the L/G is in specified positions (e.g. L/G locked down). ARINC 429 data is sent all the time when an LGCIU is in operation.
The proximity sensors on the L/G and L/G doors give position data to the two Landing Gear Control and Interface Units (LGCIUs) (Ref. AMM D/O 32-31-00-00). There are two sets of proximity sensors. The sensors in System 1 supply data to LGCIU 1 and the sensors in System 2 supply data to LGCIU 2. Each LGCIU sends the position data to the Electronic Instrument System (EIS) (Ref. AMM D/O 31-60-00-00). The EIS includes the Engine/Warning Display (EWD) (Ref. AMM D/O 31-66-00-00) and the System Display (SD). Together these make the Electronic Centralized Aircraft Monitoring (ECAM).
The position of each L/G and L/G door shows on the WHEEL page of the SD. If specified failures (or incorrect L/G configurations) occur, the E/WD gives a warning or caution message. Also, the Master Warning, or Caution lights, come on and an aural warning operates (Ref. AMM D/O 31-50-00-00).
The downlock indicator lights also show the position of each L/G (but not the L/G doors). The downlock indicator lights for the MLG and NLG are independently supplied through LGCIU 1.
Position information is described in Landing Gear Position Information (Ref. AMM D/O 32-62-00-00).
The LGCIU's supply L/G position data to other aircraft systems. Two types of data are given. These are:
- discrete logic signals
- ARINC 429 data.
The discrete outputs are sent when the L/G is in specified positions (e.g. L/G locked down). ARINC 429 data is sent all the time when an LGCIU is in operation.
2. Component Location
Not applicable
** ON A/C NOT FOR ALL Not applicable
3. System Description
Not applicable
** ON A/C NOT FOR ALL Not applicable
4. Power Supply
Not applicable
** ON A/C NOT FOR ALL Not applicable
5. Interface
Not applicable
** ON A/C NOT FOR ALL Not applicable
6. Component Description
Not applicable
** ON A/C NOT FOR ALL Not applicable
7. Operation/Control and Indicating
Not applicable
** ON A/C NOT FOR ALL Not applicable
8. BITE Test
Each of the LGCIU's contains BITE. The BITE has hardware and software for these functions:
The LGCIU-BITE supplies data to the CFDS, as a maintenance aid system.
ARINC 429 input and output data buses connect the LGCIU-BITE to the CFDS. The CFDS Interface Unit is the interface between the LGCIU-BITE and the MCDUs. Each MCDU contains a cathode-ray-tube display, function keys and keyboard. This lets the maintenance technicians:
The ground test BITE function is started on demand via the CFDS every 400 hours. This is described in Landing Gear BITE (Ref. AMM D/O 32-69-00-00).
Each of the LGCIU's contains BITE. The BITE has hardware and software for these functions:
- to continuously monitor the system for failures
- to do a test of parts of the system during power-up
- to keep a record of failures and also send this data to the Centralized Fault Display System (CFDS) and Data Recording System (Ref. AMM D/O 31-30-00-00)
- to do a System test during ground maintenance
- to simulate different L/G configurations during maintenance.
The LGCIU-BITE supplies data to the CFDS, as a maintenance aid system.
ARINC 429 input and output data buses connect the LGCIU-BITE to the CFDS. The CFDS Interface Unit is the interface between the LGCIU-BITE and the MCDUs. Each MCDU contains a cathode-ray-tube display, function keys and keyboard. This lets the maintenance technicians:
- read the failure data in the Non-Volatile Random-Access Memory (NOVOL RAM) of the LGCIU
- get access to the results of the most recent System test
- use the LGCIU functions to do L/G simulations.
The ground test BITE function is started on demand via the CFDS every 400 hours. This is described in Landing Gear BITE (Ref. AMM D/O 32-69-00-00).