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- the optional altitude reporter, - the flight computer (if required) of the optional autopilot system. Aircraft with alternate static source valve The system is in emergency operation mode when the control button of the alternate static source valve is pulled. In this mode, the cabin pressure is applied via the alternate static source valve to the instruments requiring static pressure for operation. ACAB Validity : S / N 823 - 849, 888, 948 - 9999 34-11-00Page 10 (BE) JUN 04 The dynamic pressure collected by the pitot tube is directly applied to : - the airspeed or true airspeed indicator of the L.H. instrument panel, - the airspeed or true airspeed indicator (optional) of the R.H. instrument panel. If the aircraft is equipped with two heated pitot tubes (optional), the dynamic pressure collected by the L.H. pitot tube is directly applied to the airspeed or true airspeed indicator of the L.H. instrument panel. The dynamic pressure collected by the R.H. pitot tube is applied to the airspeed or true airspeed indicator of the R.H. instrument panel. I ACAB Validity : S / N 823 - 849, 888, 948 - 9999 34-11 Page 11 00 (BE) JUN 04 PAGE INTENTIONALLY LEFT BLANK ACAB Validity : S / N 823 - 849, 888, 948 - 9999 34 11-00Page 12 (BE) FEB 00 AIR DATA SYSTEMS SERVICING CAUTION : DO NOT APPLY PRESSURE INTO STATIC AND DYNAMIC SYSTEMS AS LONG AS ALL AIR DATA INSTRUMENTS AND SYSTEMS ARE NOT DISCONNECTED FROM THE SYSTEM TO BE DRAINED. NOTE : The static pressure ports should be cleaned periodically, using a clean, lint-free cloth moistened with water mixed with cleaning agent (TB 11-001). Do not use any polishing product which may penetrate the systems and thus cause indicating errors. 1. STATIC SYSTEM DRAINING (Figures 301 and 301A) A. Tools and consumable materials - Nitrogen cylinder [maximum pressure 2.20 lbs (1 kg)] - Clean, lint-free cloths - Blanking caps and plugs B. Procedure 1) Make sure that the main switch-breaker is open. 2) Drain the static system: a) Unscrew the drain plug. NOTE : The bleed is located under the fuselage at level of cowl under hull No. 218 or 218F. b) If no water flows, position and screw the drain plug. c) If water flows, perform the following operations: 1 Disconnect all static pressure lines that terminate all atmospheric reference instruments and components [altimeter(s), altitude reporter, vertical speed indicator(s), airspeed indicator(s) and A82 flight computer of the autopilot...]. 2 Blank off each instrument fitting. With alternate static source valve 3 On the alternate static source valve: a disconnect the instrument supply hose (connected to the rear portion of the alternate static source valve), 中国通航网 www.ga.cn 通航翻译 www.aviation.cn 本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 1(25) |
