
190-00858-11 GMA 35/35c Installation Manual
Rev. H Page 1-1
1 GENERAL DESCRIPTION
1.1 Introduction
This manual is intended to provide mechanical and electrical information for use in the planning and
design of an installation of the GMA 35 into an aircraft. This manual is not a substitute for an approved
airframe-specific maintenance manual, installation design drawing, or complete installation data package.
Attempting to install equipment by reference to this manual alone and without first planning or designing
an installation specific to your aircraft may compromise your safety and is not recommended. The content
of this manual assumes use by competent and qualified avionics engineering personnel and/or avionics
installation specialists using standard aviation maintenance practices in accordance with Title 14 of the
Code of Federal Regulations and other relevant accepted practices. This manual is not intended for use by
individuals who do not possess the competencies and abilities set forth above.
Garmin recommends installation of the GMA 35 by a Garmin-authorized installer. To the
extent allowable by law, Garmin will not be liable for damages resulting from improper or
negligent installation of the GMA 35. For questions, please contact Garmin Aviation
Product Support at 1-888-606-5482.
In accordance with Title 47; Part § 15.203 of the FCC regulations, the GMA 35c must be
professionally installed in accordance with this Installation Manual. The GMA 35c is
designed only to be used within an aircraft and integrated into the avionics system. The
installer is responsible for ensuring that the proper Bluetooth antenna is installed so that
the limits in this part are not exceeded. Installation of the GMA 35c may only be
completed by Garmin authorized dealers under the agreement that only dealer installed
units may be sold.
1.2 Equipment Description
The Garmin GMA 35 is a remote-mount audio processor and marker beacon system that collects,
processes, and distributes audio signals between avionics, crew, and passengers. The GMA 35 provides the
same functions as an audio panel and can be configured to support a wide range of aircraft. The GMA 35
uses RS-232 to communicate with the control unit.
The GMA 35 is a high-fidelity digital audio product with improved circuitry that make audio signals less
prone to noise (e.g. whining sound of an alternator or blip sound from a radar). At the GMA’s core is a
digital signal processor (DSP) that cleans up audio using advanced filtering techniques and provides VOX
control for mic inputs. On the outputs, the GMA 35 features high-quality digital-to-analog converters and
headset amplifier circuits that are used to minimize noise and distortion.
The GMA 35 provides a speaker output that may be used as a cockpit speaker or for a PA system to
address passengers. The GMA 35 also includes a digital recording and playback feature. The GMA 35
allows ICS volume adjustments for pilot, copilot, and passenger. Depending on the installation there are
additional volume adjustment for all inputs (MKR, AUX, MUSIC, and TEL sources).
The GMA 35c includes Bluetooth®technology, used to wirelessly connect smartphones and tablets to
stream audio and make phone calls. The GMA 35c also connect wirelessly to the VIRB XE, eliminating
the need to install a headset audio cable.