Garmin GMA 340 AUDIO PANEL INSTALLATION MANUAL
Brand: Garmin, Pages: 43
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GMA 340 Installation ManualPage 1-5
1.7 LIMITED WARRANTY
This Garmin product is warranted to be free from defects in materials or workmanship for one year from
the date of purchase. Within this period, Garmin will at its sole option, repair or replace any
components that fail in normal use. Such repairs or replacement will be made at no charge to the
customer for parts or labor, provided that the customer shall be responsible for any transportation cost.
This warranty does not cover failures due to abuse, misuse, accident or unauthorized alteration or
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU
OF ALL OTHER WARRANTIES EXPRESS OR IMPLIED OR STATUTORY, INCLUDING ANY
LIABILITY ARISING UNDER ANY WARRANTY OF MERCHANTABILITY OR FITNESS FOR A
PARTICULAR PURPOSE, STATUTORY OR OTHERWISE. THIS WARRANTY GIVES YOU
SPECIFIC LEGAL RIGHTS, WHICH MAY VARY FROM STATE TO STATE.
IN NO EVENT SHALL GARMIN BE LIABLE FOR ANY INCIDENTAL, SPECIAL, INDIRECT OR
CONSEQUENTIAL DAMAGES, WHETHER RESULTING FROM THE USE, MISUSE, OR
INABILITY TO USE THIS PRODUCT OR FROM DEFECTS IN THE PRODUCT. Some states do
not allow the exclusion of incidental or consequential damages, so the above limitations may not apply
Garmin retains the exclusive right to repair or replace the unit or software or offer a full refund of the
purchase price at its sole discretion. SUCH REMEDY SHALL BE YOUR SOLE AND EXCLUSIVE
REMEDY FOR ANY BREACH OF WARRANTY.
To obtain warranty service, contact your local Garmin Authorized Service Center. For assistance in
locating a Service Center near you, call Garmin Customer Service at one of the numbers shown below.
Products sold through online auctions are not eligible for rebates or other special offers from Garmin.
Online auction confirmations are not accepted for warranty verification. To obtain warranty service, an
original or copy of the sales receipt from the original retailer is required. Garmin will not replace
missing components from any package purchased through an online auction.
Garmin International, Inc. Garmin (Europe) Ltd.
1200 East 151st Street Unit 5, The Quadrangle, Abbey Park Industrial Estate
Olathe, Kansas 66062, U.S.A. Romsey, SO51 9DL, U.K.
Phone: 913/397.8200 Phone: 44/1794.519944
FAX: 913/397.0836 FAX: 44/1794.519222
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Page 1-6GMA 340 Installation Manual
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GMA 340 Installation ManualPage 2-1
This section provides the necessary information for the installation and checkout of the GMA 340 Audio Panel.
Installation of the GMA 340 will differ according to equipment location and other factors. Cabling will be
fabricated by the installing agency to fit these various requirements. Appendix B contains interconnect wiring
diagrams, mounting dimensions, and information pertaining to installation. Each installation shall be
accomplished to meet the requirements of FAA AC 43.13-2A.
2.2 UNPACKING AND INSPECTING EQUIPMENT
Carefully unpack the equipment and make a visual inspection of the unit for evidence of damage incurred during
shipment. If the unit is damaged, notify the carrier and file a claim. To justify a claim, save the original shipping
container and all packing materials. Do not return the unit to Garmin until the carrier has authorized the claim.
Retain the original shipping containers for storage. If the original containers are not available, a separate
cardboard container should be prepared that is large enough to accommodate sufficient packing material to
2.3 ANTENNA INSTALLATION
2.3.1 Location Considerations
The marker beacon antenna should be mounted on a flat surface on the underside of the aircraft. Mount the
antenna so that there is a minimum of structure between it and the ground radio stations. Locate as far away as
possible from transmitter antennas.
Best results with split COM mode will be obtained when the COM 1 and COM 2 antennas are mounted on
opposite sides of the aircraft (top/bottom).
2.3.2 Antenna Installation
Install the antenna according to the antenna manufacturer’s instructions and FAA AC 43.13-2A.
2.3.3 Antenna Cable Installation
Use coax meeting the applicable aviation regulation for the marker beacon antenna cable. When routing the
cable, avoid sharp corners and route away from high current wiring, fluorescent lighting, and any transmitter
antenna cables. Follow accepted industry practices when installing the BNC connector at the antenna end of the
cable. Use a BNC connector suitable for the type of cable used.
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Page 2-2GMA 340 Installation Manual
2.3.4 Installation Approval Considerations for Pressurized Aircraft
Antenna and cable installations on pressurized cabin aircraft require FAA approved installation design and
engineering substantiation data whenever such installations incorporate alteration (penetration) of the cabin
pressure vessel by connector holes and/or mounting arrangements.
For needed engineering support pertaining to the design and approval of such pressurized aircraft antenna
installations, it is recommended that the installer proceed according to any of the following listed alternatives:
1. Obtain approved antenna installation design data from the aircraft manufacturer.
2. Obtain an FAA approved Supplemental Type Certificate (STC) pertaining to and valid for the subject
3. Contact the FAA Aircraft Certification Office in the appropriate Region and request identification of FAA
Designated Engineering Representatives (DERs) who are authorized to prepare and approve the required
antenna installation engineering data.
4. Obtain FAA Advisory Circular AC-183C and select (and contact) a DER from the roster of individuals
identified there under.
Contact an aviation industry organization such as the Aircraft Electronics Association and request their assistance.
2.4 GMA 340 INSTALLATION
Avoid installing the unit near heat sources. If this is not possible, insure that
additional cooling is provided. Allow adequate space for installation of cables
and connectors. The installer will supply and fabricate all of the cables. All
wiring must be in accordance with FAA AC 43.13-2A.
1. Assemble the connector/rack kit according to table 2-1 and figures B4 through B7. Install the rack
assembly according to the dimensions given in figures B1 and B3. Mounting brackets are not supplied
due to the wide range of mounting configurations available. Suitable mounting brackets may be
fabricated from sheet metal or angle stock. To insure a sturdy mount, rear support for the unit should be
2. Slide the unit into the rack until the jack screw makes contact with the receptacle located in the back
3. Insert a 3/32” Allen wrench into the jackscrew access hole on the faceplate.
4. Turn the Allen wrench clockwise until the unit is secured in the rack. Continue turning until tight, but do
5. To remove the unit from the rack, turn the Allen wrench counterclockwise until it disengages from the
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GMA 340 Installation ManualPage 2-3
2.5 REAR CONNECTIONS
The GMA 340 has two 44 pin connectors located at the rear of the unit, designated J1 and J2. J1 and J2 pin
assignments are given in table 2-1. When viewed from the back of the rack, J1 and J2 look like the following:
Figure 2-1. Rear Connectors
These notes apply to the following table:
* Denotes Active Low. (Ground to activate). Refer to Figures B4 through B7 for
GMA 340interconnect wiring diagrams.
** The GMA 340 provides inputs for an unswitched aircraft radio (TEL
RINGER) and an un-muted, unswitched aircraft radio (ALT WRN).