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- the "ET" (Elapsed Time) function is a programmable countdown timer. the "SET/RST" button enables the pilot to program the countdown time of "ET" function, the "OFF/VOL" control switch ensuring the ON/OFF function and audio volume adjustment, the concentric knobs which allow either : - the selection of the frequency displayed in the L.H. window when one of the timer functions is displayed in the R.H. window, - or the selection of the frequency displayed in the R.H. window, - or the programming of the timer function "ET". AFAF Validity : KR 87 / KR 87 SC+ with RMI 34-54-00 (BU) NPOa\e016 In ADF mode, A55 ADF receiver converts the RF signal generated by E35 ADF antenna into a bearing information. The information is available in sine/cosine DC voltages format. A55 ADF receiver is electrically supplied by "BUS 1" or "BUS 2" or "BUS 3" bars and protected by CB92 "ADF" circuit breaker. A55 ADF receiver is mounted into PL30 radio rack or, in variant on the R.H. panel strip. B. E35 ADF antenna E35 ADF antenna combines into a single component a reception loop and its associated circuits (preamplifier and modulators) and a sense antenna with its preamplification circuit. E35 ADF antenna features on its longitudinal axis two holes for its attachment on the aircraft fuselage. The assembly is topped with a cylindrical box which houses the electronic circuits. An electrical connector is secured on the box. E35 ADF antenna provides A55 ADF receiver via a triaxial cable with an RF signal resulting from the combination of the signals detected by the loop and the sense antenna. E35 ADF antenna is electrically supplied by A55 ADF receiver via a multiwire shielded cable. E35 ADF antenna is mounted under the fuselage between C7 and C8 frames. 4. OPERATION The ADF system operation consists of two modes of operation. In "ANT" (antenna) mode, A55 ADF receiver simply acts as an AM receiver using only the sense signal from E35 antenna. In "ADF" mode, A55 ADF receiver provides bearing information using the loop and sense signals from E35 antenna. A. "ANT" (antenna) mode The antenna mode is selected and annunciated when "ADF" pushbutton is in the out position. This mode is used for station identification. A55 ADF receiver processes the audio identification signal from the ADF ground station. The audio identification is then sent to A50 audio control box. I With KI 229 RMI The dual pointer of radio magnetic indicator (RMI) is positioned at 90° to the right of fixed marker when "ANT" (antenna) mode is activated on A55 ADF receiver. With KNI 582 RMI The single and dual pointers set to "ADF" mode by means of the pushbuttons located on the front face of radio magnetic indicator are positioned at 90° to the right of fixed marker when "ANT" mode is activated on A55 ADF receiver. 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 2(35) |
