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For the description of GPS function of the A77 COMM.NOR-ILS/GPS transceiver - refer to 37-57-00. The installation is electrically supplied by "BUS 3" bar.
2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
A77 COMM./VOR-ILS/GPS transceiver 1 PL30 / 34-50-00
M74 course deviation indicator 1 251 L / 34-52-00
Circuit breaker :
- CB 194 "NAV GPS 2" 1 PL1 / WM
AJAJ
Validity : GNS 430 34-52-00Page 1
(BU) JUN 04
A - A77 COMM.NOR-ILS/GPS transceiver
B - M74 course deviation indicator
Variante de localisation Alternate location
NAV 2 installation — Identification and location of components
Figure 1
AJAJ
Validity : GNS 430 34-52-00 Page 2 NOV 01
3. DESCRIPTION
A. A77 COMM./VOR-ILS/GPS transceiver (Figure 2)
The A77 COMM./VOR-ILS/GPS transceiver is designed for the reception of navigation and guidance signals within a frequency range from 108.00 to 117.95 MHz and reception of GS signals within a frequency range from 329.15 to 335.00 MHz. It provides M74 course deviation indicator with NAV/ILS information.
The COMM./VOR-ILS/GPS transceiver is a rectangular box installed in an attachment rack. Connections are made through three electrical connectors and four antenna connectors located on the back panel.
For the VOR/ILS functions, the front panel includes :
- the display (1) subdivided in three windows. The window (3) relative to VOR/ILS functions is located in the lower left part 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 (6) used to adjust the audio level and selects the identification code of the ground station,
- the "V<->" pushbutton (5) 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 (4) 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 M74 course deviation indicator.
The COMM./VOR-ILS/GPS transceiver is electrically supplied by "BUS 3" and protected by CB 194 "NAV GPS 2" circuit breaker.
The COMM./VOR-ILS/GPS transceiver is mounted on PL30 radio rack.
B. M74 course deviation indicator (Figure 3)
M74 course deviation indicator displays VOR, ILS and GPS information provided by the A77 COMM.NOR-ILS/GPS transceiver.
The front panel of M74 course deviation indicator includes :
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本文链接地址：TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(11)
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