Garmin GMA 240 Installation Manual

Also see for GMA 240: Pilot's guide Installation manual

Contents

Garmin GMA 240 Installation Manual Manual pdf 11 page image

190-00917-01 GMA 240 Installation ManualRev. D Page 1-11 GENERAL DESCRIPTION1.1 IntroductionThis manual provides the installation instructions for the Garmin GMA 240 Audio Panel. Reference toGMA 240 throughout this manual refers to all versions of the unit. Information pertaining to themaintenance 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/N190-00917-00.1.2 Equipment DescriptionThe Garmin GMA 240 Audio Panel is not a TSO-certified product and has received no FAA approval orendorsement.The GMA 240 meets the needs of aircraft owners and operators who require reliability and versatility inthe essential audio switching function. LED-illuminated push-button simplicity and intuitive panel layoutallow audio selection of both NAV and COM audio. Large, single-button activation of the COMmicrophone and audio for two COM transceivers simplifies cockpit workload. Photocell dimmingcircuitry automatically adjusts the brightness of the annunciators to a level appropriate for ambient cockpitlight. The brightness of the backlighting is controlled by the aircraft lighting bus. A fail-safe circuitconnects the pilot's headset and microphone directly to COM1 and a fail-safe warning audio input in theevent 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. Tofurther simplify the cockpit workload, the intercom provides for pilot isolation. One hundred percent solidstate circuitry and extensive use of surface mount technology are employed.Figure 1-1. GMA 240 Unit ViewP ILO T C OP ILO TMUTEMONSQOFF/VOLSQVOLPULLMUSICVOLTE LGMA 240P ILOTIS O MUTE MUS ICMUS ICIC SR ADIONAV1 NAV2 AUX1 AUX2C OM1MICC OM1 C OM2C OM2MICTEL11-212