Garmin GMA 240 Installation Manual - Page 7

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 deemphasis, 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 GMA 240 Installation Manual 190-00917-01 Page 1-1 Rev. B