(e)
LGCIU Flap Disconnect Function
The LGCIU's are used to convert the discrete input signals from the flap disconnect-system into ARINC 429 data for transmission to the SFFCs (Ref. 27-51-00) This LGCIU function is the same as that as described in PCB Functions.
(f)
LGCIU Cargo-Compartment Doors-System Function
The LGCIU performs two separate functions for the cargo door system (Ref. 52-35-00). Each LGCIU provides one of these functions:
-
the LGCIU in System 1 (5GA1) is used to process the cargo door warning data that is supplied to the FWCs
-
the LGCIU in System 2 (5GA2) provides a logic circuit for the electrical control system of the cargo doors.
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_ The cargo door warning system uses proximity sensors to monitor the position of the cargo doors. The LGCIU converts the discrete output signals from these proximity sensors into ARINC 429 data. This data is sent to the FWCs and the ECAM system. This LGCIU process is the same as that described in paragraph (2) subparagraphs (a) and (d).
U. Proximity Sensor
R **ON A/C 001-049, 051-099, 101-149, 151-199, 201-299, 401-499,
(Ref. Fig. 054)
**ON A/C 301-399,
(Ref. Fig. 054A)
**ON A/C ALL
(Ref. Fig. 055)
(1) Description
The proximity sensor is an electronic position indicator. The main components of the sensor are a sensor body, a sensor coil and an electrical connector. The sensor has a related target.
The sensor body contains the sensor coil. The coil is connected to the electrical connector.
Each proximity detection circuit contains:
-
a proximity sensor
-
a sensor target
-
a channel of a proximity-sensor electronics card.
The proximity-sensor electronics-card has 14 channels and is located in the LGCIU.
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Proximity Sensor and Target
Figure 054
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Proximity Sensor and Target
Figure 054A
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1 1 May 01/05
1 1
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Proximity Sensor - Operating Characteristics Figure 055
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(2) Operation
The proximity sensor continuously transmits an electrical signal to the proximity-sensor electronics-card. As the target moves into or out of the proximity-sensor's actuation area it causes a change in the proximity sensor's electrical property. The electrical signal to the proximity sensor electronics card also changes. The proximity-sensor electronics-card converts these electrical signal changes into user status signals. The LGCIU control logic modules use these user status signals to control the extension and retraction of the L/G.
8. Operation/Control and Indicating________________________________
A. Operation/Control
(Ref. Fig. 056, 057, 058, 059, 060, 061, 062)
The L/G control system is electrically controlled and hydraulically actuated. The Green system supplies the hydraulic pressure. The L/G and doors are related systems and operate in the sequence that follows:
-door uplocks released and doors open
-L/G locks released and L/G retracts or extends
-doors close.
The position of the L/G control lever controls the extension and retraction of the L/G. The L/G control lever cannot be moved to the UP position (the baulk mechanism prevents this) if:
-
the MLG is not fully extended
-
the NLG shock absorber is not fully extended
-
the nosewheels are not in the center position.
When the baulk mechanism of the L/G control lever is released, the lever can be moved to the UP position.
(1) L/G Retraction-Sequence
With the L/G down and locked, and the doors closed and locked, on
selection of UP, the LGCIU will:
(a)
Signal the doors to open.
(b)
When all the doors are fully open:
-signal the L/G to retract
-hold the doors open signal to keep the door open line pressurized.
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(c)
When all the L/Gs are up and locked:
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