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The barometric pressure resetting knob allows entering the reference atmospheric pressure used for the setting of the altimeter. This pressure is indicated in millibars and in inches of mercury in two different windows. A resetting device is provided to make the altitude scale and the pressure scale coincide. A screw located near the barometric pressure setting knob allows unlocking the resetting device. The encoding altimeter is electrically supplied by "BUS 1" bus bar via the "ALT. ENCODER" fuse. The fuse is located in the fuse panel secured on the firewall (Frame CO). F. No. 3 altimeter (option) The altimeter indicates the aircraft altitude with respect to a reference pressure (ground, Mean Sea Level). The altimeter is a classic altimeter graduated in meters (- 300 to 10668). The indicating is ensured by three concentric pointers. The barometric pressure setting knob allows setting the reference atmospheric pressure used for the setting of the altimeter. This pressure is indicated in millibars. A resetting device is provided to make the altitude scale and the pressure scale coincide. A screw located near the barometric pressure setting knob allows unlocking the resetting device. ACAB Validity : S / N 823 - 849, 888, 948 - 9999 34-11-00Page 9 (BE) FEB 00 The operation principle of the altimeter is based on an aneroid diaphragm which expands and contracts as a function of the pressure variations transmitted by the aircraft static system. G. Pitot tube Pre-MOD. 151 The pitot tube supplies the dynamic pressure, through lines, to the aircraft systems. It can be replaced by an optional heated pitot tube. Post-MOD. 151 The heated pitot tube supplies the dynamic pressure, through lines, to the aircraft systems. H. Alternate static source valve (Option Pre-MOD. 151. Standard Post-MOD. 151) A two-position selector allows the normal static source system of the aircraft to be isolated in case of clogging or icing of the static ports. The "EMERGENCY" position of the alternate static source valve admits cabin static pressure to the static system. 4. OPERATION NOTE : For equipment operation and maintenance, refer to the supplier's Maintenance Manual. The static system is provided with a draining point which allows eliminating condensation water accumulated into the lines. Aircraft with alternate static source valve The system is in normal operation mode when the control button of the alternate static source valve is depressed. All The pressure from the static pressure ports is directly or via the alternate static source valve conveyed to : - the airspeed or true airspeed indicator, the altimeter or the optional encoding altimeter and the vertical speed indicator of the L.H. instrument panel, - the optional instruments of the R.H. instrument panel that require static pressure, 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(24) |
