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TB20 MAINTENANCE MANUAL 34 导航 TB20飞机维护手册 1(63)

时间:2011-11-09 15:56来源:蓝天飞行翻译 作者:航空
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3. DESCRIPTION A. A50 audio control panel (Figure 2)
The marker receiver receives the signal detected by the antenna when the aircraft is flying over a ground beacon. Once the receiver has processed the signal, it provides a visual information and the associated audio signal.
It is incorporated into A50 audio control panel.
The front face features :
- a "SENS" pushbutton (1) to select marker receiver sensitivity
- two LED type "HI", "LO" indicator lights (3) to indicate sensitivity choice. When "HI" indicator light illuminates, the gain of the receiver input stage is increased thus enabling weaker signals to be received. When "LO" indicator light illuminates, the receiver sensitivity is decreased.
- a "MKR MUTE" pushbutton (4) to select marker output.
- three MKR indicator lights (5). Each indicator light has a marking engraved on a cover of a different color. The illumination of the lamp located inside each section indicates to the pilot that the ground beacon has been flown over.
- a "TEST" pushbutton (2) to check, on front panel, LED type indicator lights and MKR indicator lights. The marker receiver is electrically supplied by "BUS 1" bar and protected by CB 84 "AUDIO" circuit breaker. The marker receiver is mounted on PL30 radio rack.
AGAF
Validity : GMA 340 34-31-00 (CA) Page 1 NOV 01
 
B. E38 marker antenna
Marker antenna is an horizontally-polarized aerial used for omnidirectional reception of 75-MHz VHF signals.
It is a low profile antenna 14.6 inch (37 cm) long. It is secured under the fuselage on the R.H. or L.H. side between CO and C1 frames.
4. OPERATION
When the aircraft crosses the beam of a ground beacon transmitter, the marker receiver receives the signal detected by the antenna. Once the useful signal of the carrier wave has been extracted, the marker receiver provides the pilot with a visual indication of the appropriate color. The associated audio signal triggers.
Actuating "TEST" pushbutton triggers a simultaneous test of the three indicator lights of the marker receiver.
AGAF
Validity : GMA 340 34-31 00 (CA) Page 2 NOV 01
 

  A - A50 audio control panel
B - E38 marker antenna TB 9, 10, 200, 20
C - E38 marker antenna TB 21
D - E38 marker antenna (Variant)

Marker - Identification and location of components
Figure 1
AGAF
Validity : GMA 340 34-31-00 (CA) Page 3 NOV 01
 
1 - "SENS" pushbutton
2 - "TEST" pushbutton
3 - "HI", "LO" indicator lights
4 - "MKR/MUTE" pushbutton
5 - MKR indicator light
14231100AAAVVZ4100
AGAF
Validity : GMA 340 Marker - A50 audio control panel
Figure 2
34-31 00 (CA) Page 4 NOV 01
 
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