Garmin GMA 240 Installation Manual download pdf (Page 11)

190-00917-01 GMA 240 Installation Manual

Rev. D Page 1-1

1 GENERAL DESCRIPTION

1.1 Introduction

This manual provides the installation instructions for the Garmin GMA 240 Audio Panel. Reference to

GMA 240 throughout this manual refers to all versions of the unit. Information pertaining to the

maintenance of the unit can be found in the GMA 240 Maintenance Manual, P/N 190-00917-02.

Information pertaining to the operation of the unit can be found in the GMA 240 Pilot's Guide, P/N

190-00917-00.

1.2 Equipment Description

The Garmin GMA 240 Audio Panel is not a TSO-certified product and has received no FAA approval or

endorsement.

The GMA 240 meets the needs of aircraft owners and operators who require reliability and versatility in

the essential audio switching function. LED-illuminated push-button simplicity and intuitive panel layout

allow audio selection of both NAV and COM audio. Large, single-button activation of the COM

microphone and audio for two COM transceivers simplifies cockpit workload. Photocell dimming

circuitry automatically adjusts the brightness of the annunciators to a level appropriate for ambient cockpit

light. The brightness of the backlighting is controlled by the aircraft lighting bus. A fail-safe circuit

connects the pilot's headset and microphone directly to COM1 and a fail-safe warning audio input in the

event that power is interrupted or the unit is turned off.

Additionally, the GMA 240 includes a four-position intercom (ICS) with electronic cabin noise de-

emphasis, two stereo music inputs, and independent pilot and copilot/passenger volume controls. To

further simplify the cockpit workload, the intercom provides for pilot isolation. One hundred percent solid

state circuitry and extensive use of surface mount technology are employed.

Figure 1-1. GMA 240 Unit View

P ILO T COPILOT

MUTE

MON

OFF/

VOL

PULL

MUSIC

VOL

TEL

GMA 240

PILOT

IS O

MUTE MUS IC

MUS IC

IC S

RADIO

NAV1 NAV2 AUX1 AUX2

COM1

MIC

COM1

COM2

MIC

TEL

1-2

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Garmin GMA 240 Installation Manual Page 11

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