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Anleitung Zusammenfassung
Mod Levels are listed with the associated service bulletin number, service bulletin date, and the purpose of the modification. The table is current at the time of publication of this manual (see date on front cover) and is subject to change without notice. Authorized Garmin Sales and Service Centers are encouraged to access the most up-to-date bulletin and advisory information on the Garmin Dealer Resource web site at using their Garmin-provided user name and password. MOD LEVEL SERVICE BULLETIN NUMBER SERVICE BULLETIN DATE PURPOSE OF MODIFICATION Page vi Revision A GMA 240 Installation Manual 190-00917-01 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. A fail-safe circuit connects the pilot’s headset and microphone directly to COM1 and a failsafe 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. A 1.2.1 Features Summary • User-friendly, intuitive front panel layout • LEDs indicate selected function • Four position intercom: pilot, copilot, two passengers • Two stereo headset amplifiers: one for pilot, one for copilot/passengers • Two differential stereo music source inputs • Front panel music volume control, source selection, and master music on/off switch • Front panel controls for music muting by intercom and selected radios • Two selectable intercom operational modes • Selectable aural pushbutton annunciation (beep) • Independent pilot, copilot/passenger intercom volume and squelch controls • Individual VOX circuits for each of four (4) mic inputs • Automatic selection of COM audio source when corresponding mic is selected • Memory of explicitly selected COM audio source(s) when changing COM mic selection • MASQ™ Processing with configurable mute threshold • COM swap function • PTT indication • Power-off fail-safe to connect Pilot PTT, mic, and Headset to COM 1 if unit is turned off • Power-off fail-safe warning audio input • Full duplex Telephone interface • Front Panel Mini-Jack (MP3 player, cellular phone, etc.) 1.3 Technical Specifications 1.3.1 Physical Characteristics Characteristic Specification Bezel Height 1.30 inches (33 mm) Bezel Width 6.29 inches (159.77 mm) Rack Height (Dimple to Dimple) 1.33 inches (34 mm) Rack Width 6.30 inches (160.02 mm) Depth Behind Panel with Connectors (measured from face of aircraft panel to rear of connector backshells) 7.12 inches (181 mm) GMA 240 Weight (Unit Only) 15.5 oz (440 g) GMA 240 Weight (Installed with rack and connectors) 24 oz (680 g) Page 1-2 Rev. A GMA 240 Installation Manual 190-00917-01 1.3.2 Electrical Characteristics Characteristic Specification Temperature Range -20°C to +55°C (operation) -55°C to +85°C (storage) Altitude 55,000 Feet Audio Panel Functions Dedicated Transceiver inputs: 3 (including TEL) Dedicated Receiver inputs: 4 (all independently selectable) Alert (unswitched) inputs: 3 (each with configurable volume) Input impedance: 500 Q Input isolation: 60 dB minimum Alert/Receiver/Transceiver bandwidth: 100 Hz to 6.5 kHz Special functions: Fail-safe operation MASQ™ processing (Master Avionics Squelch) Configurable button push aural annunciation Intercom Functions Positions: 4 (pilot, copilot, 2 passengers) Volume controls: 3 (pilot, copilot/passengers, music) VOX level controls: 2 (pilot, copilot/passengers) VOX circuits: 4 (one per mic input) Microphone input impedance: 450 Q (compatible with 150 to 600 Q mics) Microphone bi...