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"PRESTOLITE" 32 Page 1 35-00 (AM) JUN 01 C. 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. 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 the latter. The pressurized fluid routes in the system to the actuator "retracted" or "extended" chamber. The provided pressure pushes the actuator piston in order to maneuver the landing gear to the selected position. A pressure switch, located close to the generator, cuts the system when the generator is correctly pressurized, which allows the landing gears to remain "up". The system pressure is kept by a check valve in the hydraulic generation unit. The pressure switch operates as follows : 1) At the opening, when the system reaches the required pressure for a value of 1400 psi ± 70 psi (96.55 bars ± 4.85 bars) that is between 1330 psi (91.7 bars) and 1470 psi (101.4 bars). 2) At the closing, when the pressure decreases in the system and when the landing gear is "UP", approximately 20 % below the nominal value 1400 psi (96.55 bars). The closing value is generally about 360 psi (25 bars) below the opening value. Hydraulic generation - Location of components Figure 1 WA Validity : Electrohydraulic generator "PRESTOLITE" 32-35-00 (AM)Page 3 JUN 01 PAGE INTENTIONALLY LEFT BLANK WA Validity : Electrohydraulic generator "PRESTOLITE" 32-35-00 (A.)Page 4 JUN 01 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 distribution plate, - the NORMAL / EMERGENCY valve. 2. LOCATION (Figure 1) COMPONENT QTY AREA ACCESS DOOR REFERENCE Electrohydraulic generator 1 230 218 / 238 32-35-01 Distribution plate 1 230 218 32-35-01 Landing gear emergency valve 1 250 / 32-35-02 Landing gear emergency control 1 250 / 32-35-03 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 32 起落架 TB20飞机维护手册(73) |
