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to give L/G position indication
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Cockpit Component Location
Figure 001
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Cockpit Component Location
Figure 001A
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Landing Gear System - Block Diagram Figure 002
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to give warnings and cautions that are related to L/G system failures.
A.
Position Data
Proximity sensors (installed on the L/G and L/G doors) give position data to two LGCIUs. There are two sets of sensors (System 1 and System 2), one set for each LGCIU. The LGCIU's process the data and give two types of output. They are:
-discrete logic signals
-ARINC 429 data.
Discrete logic signals are given to the applicable systems when:
-
the NLG shock absorber is compressed
-
the NLG shock absorber is not compressed
-
the NLG or the L/H MLG or the R/H MLG are downlocked
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the L/H or the R/H MLGs are in a ground condition (the applicable gear(s) is(are) locked down)
-
the L/H or the R/H MLGs are in a flight condition (not the ground condition).
ARINC 429 data is given to the applicable systems all of the time. These outputs give the L/G and L/G doors position data together with other L/G system status data.
B. Indication
The position of the L/G is shown to the crew on:
-
the WHEEL page of the ECAM system
-
the L/G downlock indicator lights.
The WHEEL page shows the position of each L/G and its door. The L/G and L/G door indications are given with data from LGCIU1(System 1) and LGCIU2 (System 2).
The WHEEL page shows automatically when:
-
the first engine starts until the first engine gets to take-off power
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the L/G is selected DOWN or at 1600 ft radio altitude (whichever is the first to occur) until the second engine shutdown.
If it is necessary for the crew to see the WHEEL page at other times, they can make a selection on the ECAM control panel.
The L/G downlock indicator-lights each show the position of a L/G (but not the L/G doors). Each light is in two parts and can show:
-
the color red and the legend UNLK in the top half (L/G not in selected position)
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the color green in the bottom half (L/G downlocked)
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-no lights (L/G uplocked).
The green lights for the NLG and each MLG have different proximity sensors, logic circuits and power supplies. This makes sure that the NLG and MLG green lights operate independently.
C. Cautions and Warnings
Cautions and warnings are given with:
-
the WHEEL page of the ECAM system
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the CWS
-
the landing gear control lever (Ref. 32-31-00).
The WHEEL page shows automatically if these warning messages show on the ECAM upper DU:
-LGCIU 1(2) FAULT
-
L/G DOORS NOT CLOSED
-
L/G GEAR NOT UPLOCKED
-
L/G GEAR NOT DOWNLOCKED
-
L/G GEAR UPLOCK FAULT
-
L/G SYS DISAGREE.
If necessary, a procedure to correct the effects of the failure is given with the warning message. When some of these failure messages show, the master warning or caution lights come on and a continuous or single chime sounds.
D. L/G Control Lever
The 'down arrow' light in the L/G control lever comes on if the conditions that follow occur:
-
the L/G is not locked down
-
the aircraft is in a landing configuration.
4. Power Supply____________
(Ref. Fig. 003)
5. Interface_________
(Ref. Fig. 004)
A. LGCIU - ARINC 429 Output Data
The LGCIUs send data along the ARINC 429 data busses to the CFDS and on to the MCDUs.
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