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(BA) JUN 01
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HYDRAULIC GENERATION
DESCRIPTION AND OPERATION
1. GENERAL
The hydraulic generation provides the pressurized hydraulic fluid which is required for the supply of the landing gear elements, used during the extension and retraction of the landing gear.
The main elements of the hydraulic generation are :
- the electrohydraulic generator,
- the NORMAL / EMERGENCY valve.
2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
Electrohydraulic generator 1 230 218 / 238 32-35-01
Landing gear emergency valve 1 250 / 32-35-02
Landing gear emergency control 1 250 / 32-35-03
3. DESCRIPTION
A. Electrohydraulic generator
The electrohydraulic generator consists of an electric motor with a double way of rotation, which drives a gear pump. The reservoir is integrated to the generator. The pressures are regulated by two pressure relief valves. A thermic valve, calibrated at 3336 psi (230 bars), protects the hydraulic system in case of hydraulic fluid overheating. Control is ensured by a lever on the configuration and control box, located on the L.H. strip. The electrohydraulic generator is secured to the L.H. side of frame C3 under the rear bench seatpan.
A circuit-breaker protects the pump system. It is supplied by the BUS 3 of the aircraft and is located on the L.H. circuit-breaker panel.
Opt. or Std Post-MOD. 151 (28 Volts)
A testable amber indicator light, located on M6 advisory panel, indicates to the pilot, via a relay, the operation of the electrohydraulic generator.
This relay, of the ILS type, is secured to frame C3, on the right of the landing gear relay support.
B. Landing gear emergency valve
The landing gear emergency valve consists of a body, a piston equipped with seals moving inside the body thanks to a control lever. The piston makes the landing gear "extended" and "retracted" systems communicate in order to allow the landing gear emergency extension. In order to maneuver the control lever, press the central knob and pull the control rearwards.
It is located under the L.H. instrument panel behind the L.H. strip.
ACAC
Validity : Electrohydraulic generator
"COMMERCIAL HYDRAULICS" 32 35-00Page 1
(CA) JUN 01
4. OPERATION
The electrohydraulic generator provides, in the landing gear hydraulic system, a pressure which allows the landing gear "retraction" or "extension" maneuvers. Two relays located close to the generator control it. The pressurized fluid routes in the system up to the actuator "retracted" or "extended" chamber. The provided pressure pushes the actuator piston in order to maneuver the landing gear up to the selected position.
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本文链接地址：TB20 MAINTENANCE MANUAL 32 起落架 TB20飞机维护手册(75)
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