LGCIU - Block Diagram
 Figure 048

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 LGCIU - L/G Retraction Control Logic Figure 049
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 LGCIU - L/G Extension Control Logic Figure 050
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 LGCIU - L/G Door Close Control Logic Figure 051
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 LGCIU - L/G Door Open Control Logic Figure 052
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 LGCIU - Baulk Solenoid Logic Figure 053
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 -an On Board Replaceable Memory Module (OBRM)
 -a Power Supply Unit (PSU).
 The 7 PCB's are:
 -2 Proximity Signal Conditioning cards
 -1 Output/Control and Indication card
 -3 Interface cards
 -1 combined OBRM/Microprocessor card.
 Two 28V d.c. inputs supply each LGCIU. One input is connected to the PSU which is connected to:
 -the two Proximity Conditioning cards
 -two of the Interface cards
 -the Microprocessor card.
 The other input is connected to the Output/Control and Indication card and the Interface card that remains.
 Data is received and transmitted by each LGCIU in ARINC 429 and discrete form. The inputs to each LGCIU are:
 -
two L/G control-lever (6GA) UP selection signals

 -
two L/G control-lever DOWN selection signals

 -an 'Active' or 'on Standby' signal from the other LGCIU
 -proximity 'target near' or 'target far' signals from:
 -16 L/G-system proximity-sensors
 -
2 Flap-disconnect proximity-sensors (1 L/H) (1 R/H)

 -
2 Cargo-Door Safety-Mechanism proximity-sensors (1 FWD) (1 AFT) SYS 1 only

 -1 Cargo-Door Locking-Handle proximity-sensors (1 FWD) (1 AFT) SYS 1 only
 -2 Cargo-Door Locking-Shaft proximity-sensors (1 FWD) (1 AFT) SYS 2 only
 -a grounding circuit for the Semi-Automatic Cargo Loading-System
 -maintenance data from the Centralized-Fault Display-Unit (CFDIU)
 -
a Ground Power 'applied' or 'not applied' signal from the External Power Contactor (3XG)

 -
a wheel speed signal from the Brakes and Steering Control Unit.

 Each LGCIU supplies output signals to the:
 -landing-gear and door selector valves (40GA/41GA)
 -safety valve (49GA) (SYS 1 only)
 -
L/G position indicators (8GB/9GB/10GB) (SYS 1 only)

 -
L/G position relays SYS 1 (11GB) SYS 2 (12GB)

 -
L/G control lever (6GA) UP baulk-solenoid

 -FWC and ECAM
 -CFDIU
 -SFCC
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 -interfaced aircraft systems that require L/G position information (Ref. 32-62-00)
 -Cargo-Door Interlock relays (6MJ/7MJ)
 -Cargo-Bay Heating Temperature-Controllers (1HC/10HC)
 -an 'Active' or 'On Standby' signal to the other LGCIU.
 (2) PCB Functions
 (a) Proximity Conditioning Cards
 The Proximity Conditioning cards change the proximity sensor 'Target Near' or 'Target Far' input signal into two user status signals Normal and Complementary. Thus:
 -
Target Near = Normal logic off, Complementary logic on

 -
Target Far = Normal logic on, Complementary logic off.

 These Normal and Complementary logic signals are supplied to the PCB's as follows:
 -
Normal and Complementary to the Microprocessor card on an ARINC 429 data bus

 -
Normal and Complementary to the Output/Control and Indication card (L/G system only)

 -Complementary only to the Interface Cards.
 (b) Output/Control and Indication Card
 The Output/Control and Indication card supplies the control logic circuits for the L/G system and the L/G position-indicator lights. The indicator-light logic-circuit is only used by the LGCIU installed in SYSTEM NO.1. This card also supplies:
 -
a 28V d.c. output and an earth return to energize the solenoid windings of the L/G and door selector valves

 -
a 28V d.c output to energize the baulk solenoid in the L/G control-lever.

 The L/G-system control-logic is divided into two parts. Each part is different in design and one part functions inversely to the other.
　
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