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The A78 COMM.NOR-ILS/GPS transceiver is a rectangular box installed in an attachment rack. Connections are made through four electrical connectors and four antenna connectors on the back panel. For the VOR/ILS functions, the front panel includes : - the display (1) subdivided in three windows. The window (4) relative to VOR/ILS functions is located in the middle L.H. portion of the display. The active frequency and below it, the standby frequency are displayed in this window. - the ".C" button (7) used to energize the equipment, - the ".V" button (5) used to adjust the audio level and select the identification code of the ground station, - the "V<->" pushbutton (6) used to enable the frequency displayed in the active frequency window to flip-flop with the frequency displayed in the "STBY" window and vice-versa, - two concentric knobs (3) used to modify standby frequency when the cursor function is enabled. If necessary, press momentarily the inner concentric knob to activate cursor function, - the "CDI" pushbutton (2) used to direct the selected VOR/ILS or GPS information source towards M73 HSI. Without "Ground Clearance" The COMM.NOR-ILS/GPS transceiver is electrically supplied by "BUS 1" bar and protected by CB 87 "NAV GPS1" circuit breaker. APAP Validity : GNS 530 34-51-00 pu) Page 2 JUN 04 A - A78 COMM.NOR-ILS/GPS transceiver Variante de localisation Alternate location ® APAP Validity : GNS 530 NAV 1 installation — Identification and location of components Figure 1 34-51-00 (Du, Page 3 JUN 04 A A - E34 GS antenna B - E33 VOR/LOC antenna C - A59 VOR signal separator (option) D - A60 GS signal separator (option) APAP Validity : GNS 530 NAV 1 installation — Identification and location of components Figure 2 34-51 00 (DU) Page 4 JUN 04 With "Ground Clearance" In normal operation, the COMM./VOR-ILS/GPS transceiver is electrically supplied by "BUS 1" bar via a main radio relay and via K201-relay contacts in idle position. It is protected by CB 87 "NAV GPS1" circuit breaker. When "Ground Clearance" function is enabled, the battery electrically supplies COMM.NOR-ILS/GPS transceiver directly, via K201-relay contacts in work position. CB 17 circuit breaker thus protects the feed line. The circuit breaker is secured to frame No. 4 near the starter relay. All The COMM./VOR-ILS/GPS transceiver is mounted on PL30 radio rack. B. E33 VOR/LOC antenna The "V" type VOR/LOC antenna consists of two radiants mounted horizontally on each side of the vertical stabilizer. It is designed for the reception of signals within a frequency range from 108 MHz to 118 MHz. 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(3) |
