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Failure of a proximity detector :
‐ The LGCIU detects any electrical failure in a proximity detector, and signals the associated
output to the flight position (shock absorber not compressed or landing gear uplocked).
The other LGCIU then automatically takes over control of the landing gear operation.
‐ In case of mechanical failure, the LGCIU does not modify the associated output. The effect that
such a failure has on the system depends upon which condition is signalled incorrectly.
Electrical failure of an LGCIU :
‐ The other (healthy) LGCIU takes control of the landing gear.
‐ The system does not force the outputs of the failed LGCIU to the safe (flight) condition.
• Some users will see “flight” condition.
• Some users will see “ground” condition.
CARGO DOORS
Sensors send to the LGCIUs the position of the following components :
‐ manuel selector valves,
‐ locking shaft,
‐ locking handle,
‐ safety shaft,
‐ door sills. ��
The LGCIUs detect electrical failures only in certain proximity switches in the cargo door system :
‐ locking shaft,
‐ locking handle,
‐ safety shaft.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - LANDING GEAR SYSTEM/INTERFACE
A318/A319/A320/A321 FLEET DSC-32-10-20 P 2/4
FCOM 19 AUG 10
When an LGCIU makes such a detection, it indicates the NON LOCKED condition for that
component.
FLAPS
The LGCIUs process the signals from four flap disconnect proximity switches, then send them to
the Slat/Flap Control Computers (SFCCs).
The LGCIUs do not monitor failures in the SFCC system.
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - LANDING GEAR SYSTEM/INTERFACE
A318/A319/A320/A321 FLEET DSC-32-10-20 P 3/4
FCOM 19 AUG 10
PROXIMITY DETECTOR OUTPUT SIGNALS
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - LANDING GEAR SYSTEM/INTERFACE
A318/A319/A320/A321 FLEET DSC-32-10-20 P 4/4
FCOM 19 AUG 10
PROXIMITY DETECTOR OUTPUT SIGNALS (CONT'D)
Applicable to: ALL
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - INTERACTIONS BETWEEN
LANDING GEAR AND AIRCRAFT SYSTEMS
A318/A319/A320/A321 FLEET DSC-32-10-30 P 1/14
FCOM 19 AUG 10
GENERAL
Applicable to: ALL
The following tables present the operational effects of the proximity detectors on aircraft systems.
How to read the tables :
SYSTEM LGCIU 1 LGCIU 2 A/C IN FLT A/C ON GROUND
SERVICE INTERPHONE 6 6 ........ ........
SFCC 1(2) 5 (5) ........ ........
The above lines mean that the service interphone receives the output n° 6 from both LGCIUs, while
SFCC 1 receive the output 5 from LGCIU 1 and SFCC 2 the output 5 from LGCIU 2.
The two additional columns give the system functioning when the aircraft is in flight and on the
ground.
PROXIMITY DETECTORS ON SHOCK ABSORBERS
Applicable to:
SYSTEM LGCIU 1
OUTPUT
LGCIU 2
OUTPUT A/C IN FLT A/C ON GRND
STROBE lts 5 On when AUTO selected Off when AUTO selected
LOGO lts 5 Off when flaps retracted On
AIRSTAIRS
(if installed) 3 1 Control inhibited(1)Control not inhibited(2)
CARGO DOOR(5) 5 normal control not available normal control available
G
E N
E R
A L
WATER FILLING 5 Preselect water
servicing inhibited
Preselect water
servicing available
AVNCS COOLING 5 5
• Skin temp. < 35 °C : The
system is in closed conf.(1)
• Skin temp. > 35 °C : The
system is in intermediate
conf.(1)
• Skin temp. < 5 °C : The system
is in closed conf.(2)
• Skin temp. > 5 °C : The system
is in open conf.(2)
GRND COOLING
(if installed)
13
13
Inhibited(1)Not inhibited(2)
A
I R
FWD CARGO
VENT 5 Extract fan stopped
when ◂P > 1 PSI Extract fan on
COND
CAB PRESS 5 5
‐ Climb mode active(4)‐ Prepressurization active before
TO (3)
‐ Depressurization active after
LDG (3)
To be continued on next page
A318/A319/A320/A321 FLIGHT CREW
OPERATING MANUAL
AIRCRAFT SYSTEMS
LANDING GEAR
GEARS AND DOORS - INTERACTIONS BETWEEN
LANDING GEAR AND AIRCRAFT SYSTEMS
A318/A319/A320/A321 FLEET DSC-32-10-30 P 2/14
FCOM 19 AUG 10
Continued from previous page
SYSTEM LGCIU 1
OUTPUT
LGCIU 2
OUTPUT A/C IN FLT A/C ON GRND
　
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