- Min. open circuit resistance : 0.1 Megohm
- Current : 2 to 10mA
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Thrust Reverser-Component Location
Figure 001
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Deploy Switch
Figure 002
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Deploy Switch
Figure 003
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Thrust Reverser Deploy/Stow Switch
Figure 004
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E E Feb 01/98 E E ECES E E 56-5B E E E - Max. closed circuit resistance : 5 ohms Each switch will be connected to ECU via shielded wires.
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(2) Operation Initially, lever (1) is held in a neutral position under spring (3) force. Lever (2) transmits lever (1) motion to a plate (5), which controls cells A and B together. The doors in the deploying sequence come into contact with the lever 1 which is caused to rotate, (the force exerted by the actuator being greater than the spring (3) force). At 95% of the deployed position, the switch is closed. The switches are connected in series so that only when all the switch contacts are closed, the ECU will receive the information "all doors deployed".
B. Stow Door Switch
(Ref. Fig. 004, 005, 006, 007)
(1) General The stowed position of the doors is sensed by four thrust reverser single switches, one per door, located onto the forward frame rear side next to the latches. The switches are dual, i.e. they include 2 cells one dedicated to each channel of the ECU. Junction wires, connection section are bedded in grease to avoid friction wear. A screw enables lever position rigging. Cells are hermetically sealed and include a compensatory system enabling their use in over-pressure (up to 2 bars). The switches are connected to the ECU via the electrical junction box. All stow switches are connected in parallel. At 0.9% of blocker doors flush position , the cells are closed . Electrical characteristics :
- Open voltage : 5 to 50VDC
- Min. open circuit resistance : 0.1 Megohm
- Current : 2 to 10mA
- Max. closed circuit resistance : 5 ohms
(2) Operation Initially under spring (2) force, the lever (3) (linked in rotation with the lever (1)) holds the two cells (5) by the plate (4) and screw (6), in position (circuit 1 open, circuit 2 closed). When the door during its stowing sequence comes to 1.1% of its flush position, a spigot fixed onto the door makes contact with the lever (1) causing it to rotate (the force exerted by actuator being greater than the spring force). Lever (1) makes lever (3) rotate. At 0.9% of flush position, lever (3) position is such that the contacts are : circuit 1 closed, circuit 2 open.
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Stow Switch
Figure 005
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Stow Switch
Figure 006
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Stow Switch Wiring
Figure 007
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The ECU receives the information one "stowed door". The contacts are
connected in parallel.
The signal combination and their complements enable to give the
following information :
- all the doors are stowed
- 1, 2 or 3 unstowed doors
- none stowed door.
C. Latch (Ref. Fig. 008, 009)
(1) General There are four latches, one per blocker door. The latches hold the doors in the stowed position and are located beside the actuators on the thrust reverser forward frame. The latches are connected in series. They are hydraulically supplied by the HCU (Hydraulic Control Unit). One latch includes :
- a hook maintained in the unlocked position by two springs
- a lever enabling under the action of two springs to maintain the hook in its locked position
- a hydraulic actuator 中国航空网 www.aero.cn 航空翻译 www.aviation.cn 本文链接地址：A320飞机维护手册 AMM EXHAUST 2(89)
