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Global Positioning System (GPS) - A78 COMM.NOR-ILS/GPS transceiver
Figure 2
ARAR
Validity : GPS 1 - GNS 530 34-57-00 (DI) Page 4 JUN 04
The other front face buttons have the following functions :
- the "RNG" pushbuttons (1) modify the scale of the card displayed on the screen,
- the "—el" pushbutton (2) provides access to the "Direct to" navigation operation mode towards a waypoint,
- the "MENU" pushbutton (3) provides access to a list of options inside a page,
- the "CLR" pushbutton (4) enables the pilot to cancel the data displayed on the screen or to come back to NAV 1 page,
- the "ENT" pushbutton (5) enables the pilot to validate an operation or to store the data entered with the cursor function,
- the "PROC" pushbutton (7) enables the pilot to select and modify the loading of departure, approach or arrival procedures of the initiated flight plan,
- the "VNAV" pushbutton (8) provides access to the vertical navigation page,
- the "FPL" pushbutton (9) enables the pilot to create, edit and initiate flight plans,
- the "MSG" pushbutton (10), enables the pilot, when "MSG" message appears on the display, to access a consultation page,
- the "OBS" pushbutton (12) enables the selection of the manual mode (OBS of the course deviation indicator or of the HSI) or of the automatic mode (LEG) when sequencing the waypoints,
- the "CD," pushbutton (13) enables the selected VOR/I LS or GPS information to be directed towards M81 course deviation indicator or towards the M73 HSI,
- the ".C" pushbutton (14) enables the energization of the system. Without "Ground Clearance"
The A78 COMM.NOR-ILS/GPS transceiver is electrically supplied by "BUS 1" bar via CB 87 "NAV GPS 1" circuit breaker.
With "Ground Clearance"
In normal operation, the A78 COMM.NOR-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 A78 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 A78 COMM.NOR-ILS/GPS transceiver is mounted on PL30 radio rack. B. E48 GPS antenna
E48 GPS antenna ensures the reception of the signals. It operates within the D band at the frequency of 1575.42 MHz.
It is a flat and small size antenna secured by means of four nuts.
The antenna is mounted on top of the fuselage between C3 and C4 frames.
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本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(65)
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