TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(77)_通航信息_通航_通用航空

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GLOBAL POSITIONING SYSTEM (GPS)
DESCRIPTION AND OPERATION
1. GENERAL
The GPS is a satellite-based radionavigation system which enables an aircraft to be located anywhere (tridimensional positioning : latitude, longitude and altitude).
The system consists of :
- the A78 GPS receiver,
- the E48 GPS antenna,
- the configuration module (if installed),
Interfaced-with-HSI version
- the A92 relay box,
- the A93 relay box. The system uses the horizontal situation indicator (HSI) of the heading reference system - refer to 34-21-00. All
The system also uses annunciators/switches or indicator lights of M6 advisory panel - refer to 31-50-00.
The GPS receiver receives information from the following equipment :
- the fuel flow system (option) - refer to 73-30-00,
- the encoding altimeter (option) - refer to 34-11-00.
The GPS sends information to the following equipment :
- the A50 audio control panel - refer to 23-11-00,
- the M63 multifunction display (option) - refer to 34-62-00,
- the VHF NAV/COMM. (KX 155A or KX 165A) transceiver of NAV1 installation or NAV2 installation (option) -refer to 34-51-00 or 34-52-00.
The system is electrically supplied by "BUS 3" bar.
2. LOCATION (Figure 1)
COMPONENT QTY AREA ACCESS DOOR REFERENCE
A78 GPS receiver 1 251C / 34-50-00
E48 GPS antenna 1 240 / 34-57-02
A92 relay box (option) 1 250 / 34-57-05
A93 relay box (option) 1 250 / 34-57-05
Configuration module (if installed) 1 250 / 34-57-00

APAP
Validity : KLN 94 - Stand alone or Interfaced with HSI 34-57-00Page 1
(El) JUN 04

Global Positioning System (GPS) - Identification and location of components
Figure 1
I APAP
Validity KLN 94 - Stand alone or Interfaced with HSI 34 57-00Page 2
(El) JUN 04

COMPONENT QTY AREA ACCESS DOOR REFERENCE
M6 advisory panel 1 251 L / 31-50-01
Circuit breaker :
- CB 194 "GPS" or "GPS1" 1 PL1 / WM

3. DESCRIPTION
A. A78 GPS receiver (Figure 2)
The A78 GPS receiver can provide :
- permanent aircraft position-related information (longitude and latitude),
- guidance and navigation information display in relation to a flight plan defined by the pilot.
It also uses data stored in a database located in a data base card (1) inserted in the front panel of the equipment.
Mainly controlled by the two concentric knobs (7), the A78 GPS receiver can present a variety of information in a number of different page formats. One way to understand how the information are presented is to think of the receiver various display types as chapters in a book, with numbered pages each.
　
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TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 2(77)