A320飞机维护手册 AMM LANDING GEAR 起落架8(73)

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 of cams in the shock absorber.
 Before the aircraft is towed, the hydraulic system must be depressurized
 through action on a lever which can be locked in its two positions.
 This lever is located on an electrical box easily accessible from the
 ground.
 The maximum towing angle is plus or minus 95 deg.

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 Steering System - Principle
 Figure 005

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 Wheel Steering Control - Taxi mode
 Figure 006

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 Wheel Steering Control - Takeoff/Landing Mode
 Figure 007

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 Generation of the Nose Wheel Steering Angle
 Figure 008

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 4. Power Supply____________ (Ref. Fig. 009)
 5. Interface_________ (Ref. Fig. 010)
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 Steering - Power Supplies Schematic
 Figure 009

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 Nose Wheel Steering System - Interface
 Figure 010

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 6. Component Description
_____________________
 A. Steering Handwheel Transmitter Unit 1GC (2GC)
 (Ref. Fig. 011, 012)
 There are two steering handwheel transmitters (CAPT and F/O).
 It includes two control potentiometers and two monitoring potentiometers,
 driven by different gears to permit the detection of any rupture of the
 control.
 The travel of each potentiometer is plus or minus 150 deg.
 In addition, it includes a pushbutton switch for the disconnection of the
 steering control through the rudder pedals.

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 Nose Wheel Steering - Handwheel Transmitter Unit
 Figure 011

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 Nose Wheel Steering - Wiring
 Figure 012

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 Steering orders from the pedals are sent to the BSCU via the ELAC. Steering by pedals is limited to 6 deg. depending on A/C speed.
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 The two actuating cylinders operate together to turn the rotating tube of
 the NLG.
 The actuating cylinder drives the rotating tube via a rack-and-pinion
 assembly.
 Two anti-shimmy valves (one per chamber) are installed on the steering
 cylinder.

 -Piston diameter: 79.25 mm
 -Internal stop for plus or minus 95 deg. wheel travel i.e. a stroke of plus or minus 123 mm.
 -Maximum flow: 7.55 l/mn which corresponds to a steering speed of 18 deg./s (at no load)
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 D. Selector Valve 7GC (Ref. Fig. 013) The description is the same as the Normal Brake Selector Valve 23GG.
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 Selector Valve
 Figure 013
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 E. Safety Valve 2900GM
 (Ref. Fig. 014)
 The safety valve is installed between the selector valve and the swivel
 selector valve.
 It stops the flow in the line if there is a leakage.
 The safety valve is made to operate only if the flow is more than or
 equal to 4 l/mn.
 The time for valve closure is less than 5 s (with fluid temperature =
 30deg.C) for a flow rate more than or equal to 5 l/mn under a supply
 pressure of 206 bars (2987 psi).

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 Safety Valve
 Figure 014
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 F. Hydraulic Block 6GC
 (Ref. Fig. 015)
 A hydraulic block attached to the rear of the nose gear strut includes:
　
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