Garmin GTX 320 Manual de instalação - Página 22

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3.2.1 Function Selection Switches

The function selector switch is a five position rotary switch. The five positions are:

OFF

Turns off all power to the GTX 320/320A.

SBY

Turns the transponder on, but when in SBY the transponder will not reply to any

interrogations from the ground radar system.

Places the transponder in Mode A, the identification mode. In addition to the aircraft's

identification code, the transponder will also reply to altitude interrogations (mode C) with signals

that do not contain altitude information.

ALT

Places the transponder in Mode A and Mode C, the identification and altitude reporting

modes to respond to ATC aircraft identification interrogations and altitude interrogations with

standard pressure altitude (29.92 inches Hg.) received from an external altitude digital encoder. The

ALT position may be used in aircraft that are not equipped with the optional altitude encoder,

however, the only response will be discreet signals that do not contain altitude information.

Any time the function switch is in the ON or ALT position the transponder becomes an active part of the

beacon system. Select ON or ALT as late as practical prior to takeoff and to OFF or SBY as soon as

practical after completing landing roll unless the change to SBY has been accomplished previously at the

request of ATC.

TST

Turning the switch to the TST position tests the reply indicator. The TST position is spring

loaded and must be held momentarily. When released, it will automatically return to the ALT

position.

3.2.2 Code Selection

The code selector consists of four, eight position switches that provide 4,096 active identification codes.

When making routine code changes, you should avoid inadvertent selection of codes 7500, 7600, or 7700 thereby

causing momentary false alarms at automated ground facilities. For example when switching from code 2700 to

code 7200, switch first to 2200 then 7200, NOT to 7700 and then 7200.

This procedure applies to nondiscrete code 7500 and all discrete codes in the 7600 and 7700 series (i.e., 7600-

7677, 7700-7777) which trigger special indicators in automated facilities. Only nondiscrete code 7500 will be

decoded as the hijack code. An aircraft's transponder code (when available) is utilized to enhance the tracking

capabilities of the ATC facility, therefore you should not turn the transponder to SBY when making routine code

changes.

See the Aeronautical Information Manual (AIM) for a detailed explanation of the identification codes.

Page 3-2

Rev M

NOTE

GTX 320/320A Installation Manual

190-00133-01