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Garmin GMA 340 Audio Panel

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Comments to date: 5. Page 1 of 1. Average Rating:
heechee 4:51pm on Sunday, September 19th, 2010 
Its a little sluggish, and the wheel type selector is more awckward than a four way selector. Other than that no complaints, great starter MP3 player.
enzoaeneas 11:26am on Sunday, August 1st, 2010 
Great player sansa are a real good quility make everything its a really good player it has a good battery life loved the scroll wheel had a bit of a ...
tetedelfe 2:29pm on Thursday, June 17th, 2010 
I use the Fuze at the beach and when I am reading. It has a great sound and is very,very easy to navigate. I really like the shape and its really good quality. The sound is crisp and clear. "Good shape","Durable","High Quality","Good Value" "Not ipod"
skynet 10:35pm on Saturday, June 12th, 2010 
Received product in timely manner. Product has performed as expected. 24 hours on a charge took it camping and lasted all weekend on a single charge I wouldt use it for video or pictures as you need to convert to view th...
Lilibeta 12:43pm on Monday, April 5th, 2010 
Does everything I want and more. I can delete files without hooking to a computer and increase capacity with a mini sd card. This is product is great. Nice head phones for stock. easy to use and Super cheap. everyone likes cheap and upgradable

Comments posted on www.ps2netdrivers.net are solely the views and opinions of the people posting them and do not necessarily reflect the views or opinions of us.

 

Documents

SECTION 2 INSTALLATION

2.1 INTRODUCTION..... 2-1 2.2 UNPACKING AND INSPECTING EQUIPMENT... 2-1 2.3 ANTENNA INSTALLATION.... 2-1 2.3.1 Location Considerations..... 2-1 2.3.2 Antenna Installation.... 2-1 2.3.3 Antenna Cable Installation.... 2-1 2.3.4 Installation Approval Considerations for Pressurized Aircraft.. 2-2 2.4 GMA 340 INSTALLATION.... 2-2 2.5 REAR CONNECTIONS.... 2-3 2.5.1 Location..... 2-3 2.5.2 Audio Shield Termination.... 2-5 2.5.3 Noise..... 2-6 2.6 POST INSTALLATION CHECKOUT.... 2-6 2.6.1 Lamp Test..... 2-6 2.6.2 Failsafe Operation Check.... 2-7 2.6.3 Transceiver Operational Check.... 2-7 2.6.4 Intercom System (ICS) Check.... 2-7 2.6.5 Aircraft Receivers Check.... 2-8 2.6.6 Music System Check..... 2-8 2.7 ADJUSTMENTS..... 2-9
GMA 340 Installation Manual 190-00149-01 Page i Rev. L

SECTION 3 OPERATION

PARAGRAPH
3.1 OPERATION.... 3-1 3.1.1 Front Panel Controls.... 3-1 3.1.2 On, Off, and Failsafe Operation.... 3-2 3.1.3 Lighting..... 3-2 3.1.4 Transceivers..... 3-2 3.1.5 Split Com..... 3-3 3.1.6 Com Swap Function.... 3-3 3.1.7 Aircraft Radios & Navigation.... 3-3 3.1.8 Speaker Output.... 3-3 3.1.9 PA Function.... 3-4 3.1.10 Auxiliary Entertainment Inputs.... 3-4 3.1.11 Intercom System (ICS).... 3-4 3.1.12 Mono/Stereo Headset.... 3-5 3.1.13 Marker Beacon Receiver.... 3-6
APPENDIX A CERTIFICATION DOCUMENTS
A.1 CONTINUED AIRWORTHINESS.... A-1 A.2 ENVIRONMENTAL QUALIFICATION FORM... A-4
APPENDIX B INSTALLATION DRAWINGS

B.1 GENERAL.....B-1

APPENDIX C STC PERMISSION

C.1 GENERAL.....C-1

Page ii Rev. L

LIST OF ILLUSTRATIONS

FIGURE 2-1 2-2 2-3 3-1 B1 B2 B3 B4 B5 B6 B7
REAR CONNECTORS.... 2-3 AUDIO SHIELD TERMINATION... 2-5 ACCESS HOLE LOCATION.... 2-9 GMA 340 FRONT PANEL.... 3-1 GMA 340 OUTLINE DRAWING....B-3 CONNECTOR/RACK KIT DRAWING...B-5 GMA 340 RECOMMENDED PANEL CUTOUT DIMENSIONS..B-7 J1 INTERCONNECT WIRING DIAGRAM...B-9 J2 INTERCONNECT WIRING DIAGRAM....B-11 J1 INTERCONNECT WIRING DIAGRAM....B-13 J2 INTERCONNECT WIRING DIAGRAM....B-15

LIST OF TABLES

Table PAGE
2-1. J1 and J2 Pin Assignments.... 2-4 2-2. Recommended Crimp tools.... 2-5

Page iii Rev. L

GMA 340 HARDWARE MOD LEVEL HISTORY The following table identifies hardware modification (Mod) Levels for the GMA 340 audio panel. 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-todate bulletin and advisory information on the Garmin Dealer Resource web site at www.garmin.com using their Garmin-provided user name and password.

MOD LEVEL

SERVICE BULLETIN NUMBER 0208B 0221
SERVICE BULLETIN DATE 2-2-01 6-13-01 5-17-02 5-2-02 5-2-02 7-16-02 8-26-02 *

PURPOSE OF MODIFICATION

Configurable option to mute other com audios when transmitting. Provides times ten gain (20 dB) for entertainment music system. Provides correct marker beacon output loading for interface with a Sandel SN3308 EHSI. Provides failsafe operation when monophonic headsets are used in a stereo installation. Provides switchable On/OFF times ten gain (20 dB) for entertainment music system. Filter capacitors added to prevent power supply noise from interfering with a GDL 49. Prevents current limiting resistors from becoming shorted to the chassis. Adds a failsafe warning audio to the GMA 340.
Not released at time of publication.

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INTRODUCTION
This manual provides the installation and operating instructions for the Garmin GMA 340, GMA 340H and GMA 340 Dual ADF Audio Panel. Reference to GMA 340 throughout this manual refers to all versions of the unit. Information pertaining to the maintenance of the unit can be found in the GMA 340 Maintenance Manual, P/N 190-00149-02. After installation of the GMA 340, FAA Form 337 must be completed by an appropriately certificated agency to return the aircraft to service. 1.2 GENERAL DESCRIPTION
The Garmin GMA 340 Audio Panel 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 up to three COM transceivers simplifies cockpit workload. Photocell dimming circuitry automatically adjusts the brightness of the LEDs to a level appropriate for ambient cockpit light. A failsafe circuit connects the pilots headset and microphone directly to COM1 in the event that power is interrupted or the unit is turned off. In the event of power loss a fail-safe warning audio will be heard. Additionally, the GMA 340 includes a six-position intercom (ICS) with electronic cabin noise de-emphasis, two stereo music inputs, and independent pilot, copilot, and passenger volume controls. To further simplify the cockpit workload, the intercom provides three selectable modes of isolation. One hundred percent solid state circuitry and extensive use of surface mount technology are employed. A pilot-selectable cabin speaker output can be used to listen to the selected aircraft radios or to broadcast PA announcements. The PA function is pilot selectable. The GMA 340 is FAA TSO approved to C50c and C35d and JTSO approved to C50c and 2C35d. Also standard is the marker beacon receiver with dual sensitivity and audio muting with automatic re-arming. 14V or 28V operation, including the full rated range of headphone and speaker output power, is available without the requirement for external voltage converters or dropping resistors. The GMA 340 is the standard version audio panel as pictured on the cover of this manual. The GMA 340H is the helicopter version in which the pilot and copilot control knobs on the front panel are reversed. The GMA 340 Dual ADF version, also pictured on the cover, accepts two ADF audio inputs. Features Summary: User-friendly, intuitive front panel layout LEDs indicate selected function Six position intercom: pilot, copilot, four passengers Three stereo headset amplifiers: one for pilot, one for copilot, and one for the passengers Two stereo music source inputs (one in Dual ADF version) Three selectable intercom operational modes Selectable aural pushbutton annunciation (beep) for the crew.

Headphone Outputs

Speaker Outputs

Marker Beacon Receiver

EQUIPMENT
GMA 340 Audio Panel, Ship Level Assembly, P/N 010-00152-( ) includes the following, depending on part number: 011-00401-( ) GMA 340 Unit Assembly (011-00401-10 replaces 011-00401-00) 011-00652-00Connector Kit, GMA 340 011-00678-00Rack Backplate, GMA 340 115-00262-00SMP, Install Rack, GMA 340 (The installation kit is the same for the GMA 340, GMA 340H and GMA 340 Dual ADF) 1.5 INSTALLATION ACCESSORIES Marker beacon antenna kit (P/N 010-10175-00). [Note: A marker beacon antenna approved to TSO C35( ) that has been installed to meet the requirements of this manual may be approved for use with the GMA 340].

Page 1-3 Rev. L

ADDITIONAL EQUIPMENT REQUIRED Antenna sealant (use manufacturers instructions, install according to FAA AC 43.13-2A). Cables: The installer will fabricate and supply all system cables. Interconnect wiring diagrams are detailed in Appendix B. Hardware: #6-flat head screw (6 ea.) and #6-32 self-locking nut (6 ea.). Hardware required to mount the installation rack is not provided. Stereo headphone jacks (up to 6), microphone jacks (up to 6), 3.5mm stereo jacks (up to 2), and insulating washers for all.

Page 1-4 Rev. L

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 repairs. 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 to you. 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. 1200 East 151st Street Olathe, Kansas 66062, U.S.A.

Phone: 913/397.8200 FAX: 913/397.0836
Garmin (Europe) Ltd. Unit 5, The Quadrangle, Abbey Park Industrial Estate Romsey, SO51 9DL, U.K.
Phone: FAX: 44/1794.519944 44/1794.519222

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2.1 INTRODUCTION
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 prevent movement. 2.3 2.3.1 ANTENNA INSTALLATION 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 manufacturers 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.

Page 2-1 Rev. L

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 antenna installation. 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 NOTE 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 provided. 2. Slide the unit into the rack until the jack screw makes contact with the receptacle located in the back plate. 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 not over-tighten. 5. To remove the unit from the rack, turn the Allen wrench counterclockwise until it disengages from the rack.

The audio shield wires should be terminated at the rear of the unit to the screws between J1 and J2 as shown in figure 2-2.
Rear View of backplate and rack

340 P2

340 P1
Audio shields daisy chained and terminated using a lug attached to either of these screws.
Figure 2-2. Audio Shield Termination

Page 2-5 Rev. L

Because the audio panel is a point in the aircraft where signals from many pieces of equipment are brought together, care must be taken to minimize effects from coupled interference and ground loops. Coupled interference can sneak into audio system interconnecting cables when they are routed near large AC electric fields, AC voltage sources, and pulse equipment (strobes, spark plugs, magnetos, EL displays, CRTs, etc). Interference can also couple into audio system interconnecting cables by magnetic induction when they are routed near large AC current-carrying conductors or switched DC equipment (heaters, solenoids, fans, autopilot servos, etc). Ground loops are created when there is more than one path in which return currents can flow, or when signal returns share the same path as large currents from other equipment. These large currents create differences in ground potential between the various equipment operating in the aircraft. These differences in potential can produce an additive effect at an audio panel signal input. The audio panel may see the desired input signal plus an unwanted component injected by ground differentials, a common cause of alternator-related noise. This is the main reason why all audio jacks should be isolated from ground. Terminating audio shields just at one end eliminates another potential ground loop injection point. Single-point grounding cannot be overstressed for the various avionics producing and processing audio signals. Single-point, in this context, means that the various pieces of equipment share a single common ground connection back to the airframe. Good aircraft electrical/charging system ground bonding is also important. The wiring diagrams and accompanying notes in this manual should be followed closely to minimize noise effects. 2.6 POST INSTALLATION CHECKOUT CAUTION Check wiring connections for errors before inserting the GMA 340 into the tray. Incorrect wiring could cause internal component damage. Except for marker beacon operation, an in-aircraft checkout may be performed in the aircraft on the ramp with known good microphone, headset, speaker and avionics receivers. Item numbers in parentheses refer to front panel controls shown in figure 3-1, page 3-1. 2.6.1 Lamp Test

Apply power to the unit by rotating the pilot intercom knob (5) clockwise. The GMA 340 test button (17) checks the internal LED annunciators and marker beacon LEDs (1). Press TEST to confirm operation of the LEDs. Cover the photocell (19) with a finger and observe that the LED annunciators dim automatically. Check the front panel backlighting and dimming function. Each annunciation is illuminated.

Page 2-6 Rev. L

Failsafe Operation Check
1. Turn the unit off by rotating the pilot intercom knob (5) counter clockwise. 2. Check the failsafe operation by exercising the COM 1 microphone, microphone key and audio over the headphones. NOTE For units without Mod 4 incorporated, if a monaural headset is plugged into a stereo jack the ring conductor will be shorted to the barrel conductor when the headset is plugged in preventing proper failsafe operation. No audio will be heard. In this type of installation, either a stereo/mono switch must be installed for proper operation or Mod 4 must be incorporated. If Mod 4 is incorporated, the audio will be heard only in the left channel of a stereo installation. See note 13 in figures B5 and B7 and refer to Garmin Service Bulletin 0209. 3. Turn the unit back on to continue testing. 2.6.3 Transceiver Operational Check
1. Perform a ramp test radio check by exercising the installed transceivers, microphone, microphone key and audio over the headphones and speaker. 2. Verify that communications are loud and clear and PTT operation is correct. 2.6.4 Intercom System (ICS) Check NOTE If a monaural headset is used in one position, no damage will occur if plugging into a stereo jack. In the case of passenger positions, any stereo listener will lose one channel when another passenger plugs in a mono headset. 1. Set the intercom to the ALL mode [Crew (9) and Pilot (10) LEDs off.] 2. Plug in headsets at each ICS position. NOTE For helicopter operation using a two-stage Intercom/PTT switch, prior to using the keyed-intercom mode, the VOX level should be set by adjusting the VOX knob while the first detent is actuated and held. 3. Adjust squelch (8) and volume (7) for each position and verify that the ICS is working properly. 4. Check Pilot and Copilot ICS positions for isolation and proper operation of volume and squelch controls (5, 6, 7 and 8). 5. Press the PA button (11). Verify that microphone audio is heard over the speaker.

The intensity of the button annunciators and marker beacon LEDs are controlled automatically by a built-in photocell (19) on the front panel. Nomenclature backlighting is controlled by the aircraft dimmer bus. See installation wiring diagrams in Appendix B for guidance on connecting the dimmer bus to the GMA 340. 3.1.4 Transceivers NOTE Audio level is controlled by the selected com radio volume control. Selection of either COM 1, COM 2, or COM 3 (13) for both MIC and audio source is accomplished by pressing either COM 1 MIC, COM 2 MIC, or COM 3 MIC (14). The active com audio is always heard on the headphones. Each audio source can be selected independently by pressing COM 1, COM 2, or COM 3 (13). When selected in this way, they remain active as audio sources independently of which transceiver has been selected as the active microphone source. When a microphone is keyed, the active transceivers MIC button LED blinks approximately once per second to indicate the transmitter is active. When no aircraft radio activity is detected by the GMA 340, the amount of ambient background noise from the radios is further reduced by the MASQTM circuit. This processing is also applied to the Nav radios (described in 3.1.7). If this feature is not desired, then J1 pin 16 (MASQ INH*) should be tied to ground.

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Split Com (Not Applicable to Dual ADF)
Pressing the COM 1/2 button (15) activates the split com function. While this mode is active, COM 2 is dedicated solely to the copilot as a MIC/audio source while COM 1 is dedicated to the pilot as a MIC/audio source. The pilot can still listen to COM 3, NAV 1, NAV 2, DME, ADF, and MKR. The pilot and copilot can simultaneously transmit in this mode, the pilot transmitting over COM 1 and the copilot transmitting over COM 2. The SPLIT COM mode is cancelled by pressing the COM 1/2 button a second time. While in the split com mode the copilot may make PA announcements while the pilot continues using COM 1 independently. When the PA button is pressed after the split com mode is activated, the copilots mic is output over the cabin speaker when keyed. A second press of the PA button returns the copilot to normal split com operation.
NOTE If the com radios in the installation utilize a transmit interlock system, the split com function may require that this feature is enabled. Refer to the radios installation manual for guidance. Garmin makes no expressed or implied guarantees regarding the suitability of the split com feature in a given installation. 3.1.6 Com Swap Function
The GMA 340 allows the use of a remote mounted switch (typically on the yoke) to alternately transfer the active microphone back and forth between COM 1 and COM 2. The remote switch should be a momentary type, connected between J2 pin 20 (SWAP*) and J2 pin 21 (SWAP return). Pressing the remote switch will have no affect if COM 3 is the active transceiver or when split com is in use. 3.1.7 Aircraft Radios & Navigation NOTE Audio level is controlled by the selected nav radio volume control. Pressing NAV 1, NAV 2, DME, ADF (16), or MKR (2) (see MKR beacon operation) selects that audio source. A second button press deselects the audio source. In addition, the GMA 340 provides inputs for an unswitched aircraft radio (TEL RINGER) and an unmuted, unswitched aircraft radio (ALT WRN). 3.1.8 Speaker Output

Pressing the SPKR button (12) selects Aircraft radios over the cabin speaker. The speaker output is muted when a COM microphone is keyed. Speaker level is adjustable through an access hole in the top of the unit (see figure 23).

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PA Function
The PA mode is activated by pressing the PA button (11). Then, when either the pilots or copilots microphone is keyed, the corresponding mic audio is heard over the cabin speaker. If the SPKR button (12) is also active, then any selected speaker audio is muted while the microphone is keyed. The SPKR button does not have to be previously active in order to use the PA function. Pilot and copilot PA microphone speaker levels are adjustable through an access hole in the top of the unit (see figure 2-3). 3.1.10 Auxiliary Entertainment Inputs The GMA 340 and 340H provide two stereo entertainment inputs: MUSIC 1 and MUSIC 2. The 340 Dual ADF has only MUSIC 1. MUSIC 1 is soft-muted during all aircraft radio activity and normally during ICS activity. MUSIC 2 is a non-muted input. These inputs are compatible with popular portable entertainment devices such as cassette tape or CD players. The headphone outputs of these devices are used and plugged into MUSIC 1 or MUSIC 2. Two 3.5 mm stereo phone jacks should be installed in a convenient location for this purpose. MUSIC 1 and MUSIC 2 have characteristics that are affected by the active intercom mode (see paragraph 3.1.11). Refer to the notes in paragraphs 2.6.2 and 2.6.6 for mono/stereo connections and music amplification. 3.1.11 Intercom System (ICS) (Pilot and Copilot functions are reversed on the 340H) Intercom volume and squelch (VOX) are adjusted using the following front panel knobs (note that knobs are reversed in the 340H version: LEFT SMALL KNOB Unit on/off power control and Pilot ICS volume (5). Full CCW DETENT position is OFF. LEFT LARGE KNOB Pilot ICS mic VOX squelch level (6). CW rotation increases the amount of mic audio (VOX level) required to break squelch. Full CCW is the hot mic position. RIGHT SMALL KNOB IN position: Copilot ICS volume. OUT position: Passenger ICS volume (7). RIGHT LARGE KNOB Copilot and passenger mic VOX squelch level (8). CW rotation increases the amount of mic audio (VOX level) required to break squelch. Fully CCW is the hot mic position. Each microphone input (six total) has a dedicated VOX circuit to ensure that only the active microphone(s) is/are heard when squelch is broken. This represents a vast improvement over single-gate systems and reduces the amount of background noise in the headphones during cockpit communications. After the operator has stopped talking, the intercom channel remains momentarily open to avoid closure between words or normal pauses. The GMA 340 provides three intercom modes: PILOT, CREW and ALL. The mode selection is accomplished using the PILOT (10) and CREW (9) buttons. Pressing a button activates the corresponding ICS mode. Pressing again deactivates the mode. The operator can switch directly from PILOT to CREW or from CREW to PILOT by pressing the other mode button. ALL mode is active when neither PILOT or CREW mode is selected. These modes allow different degrees of interaction between the crew and passengers:

GMA 340 Installation Manual 190-00149-01 Page 3-5 Rev. L
3.1.13 Marker Beacon Receiver The marker beacon is part of an ILS system, and in certain instances, used to identify an airway. In addition to the normal marker beacon functions, the GMA 340 provides an audio muting function. The LEDs illuminate, and an associated keyed-tone is heard (when MKR audio is selected), when the aircraft passes over a 75 MHz marker beacon transmitter. The lights and audio keying for ILS approach operation are summarized below. Audio Frequency 400 Hz 1300 Hz 3000 Hz Audio Keying LED Actuated Blue (Outer) Amber (Middle) White (Airway/Inner)
The marker beacon audio level is aligned at the factory to produce its rated audio output. However, the output level is adjustable through an access hole in the top cover of the unit (see figure 2-3). The GMA 340s marker beacon receiver controls are located on the left side of the front panel [(1) through (4)]. The SENS button (4) selects either high or low sensitivity as indicated by the HI or LO LED being lit. Low sensitivity is used on ILS approaches while high sensitivity allows operation over airway markers or to get an earlier indication of nearing the outer marker during an approach. The marker audio is selected initially by pressing the MKR/mute button (2). If no marker beacon signal is received, then pressing again will deselect the marker audio. This operation is similar to selecting any other audio source on the GMA 340. However, if the second button press occurs while a marker beacon signal is received, then the marker audio is muted but not deselected. The buttons LED will remain lit to indicate that the source is still selected. The GMA 340s SmartMuteTM function then monitors the marker signal and automatically unmutes the audio when the current marker signal is no longer being received. In all cases, the marker beacon LEDs operate independently of any audio selection and cannot be turned off. The GMA 340 can drive external marker lamps if required. Maximum source current is 125 mA (8 Vdc max).

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A.1 CONTINUED AIRWORTHINESS
This section provides assistance to the installing agency in preparing Instructions for Continued Airworthiness (ICA) in response to Bulletin Number HBAW 98-18, Checklist for Instructions for Continued Airworthiness for Major Alterations Approved Under the Field Approval Process, effective 10/7/98. Aviation Authority approved installers are hereby granted permission to reference appropriate service instructions and excerpts from this Installation Manual to accomplish the Instructions for Continued Airworthiness. This permission does not construe suitability of the documents. It is the applicants responsibility to determine the suitability of the documents for the ICA. Following is suggested ICA for a Garmin GMA 340 Audio Panel installation. Some of the checklist items do not apply, in which case they should be marked N/A (Not Applicable). In this sample, square braces are used to indicate instances where explicit words should be substituted. INSTRUCTIONS FOR CONTINUED AIRWORTHINESS, GARMIN GMA 340 AUDIO PANEL 1. Introduction [Aircraft that has been altered: Registration (N-) number, Make, Model and Serial Number] Content, Scope, Purpose and Arrangement: This document identifies the Instructions for Continued Airworthiness for the modification of the above aircraft by installation of a Garmin GMA 340 Audio Panel. Applicability: Applies to aircraft altered by installation of the Garmin GMA 340 Audio Panel. Definitions/Abbreviations: None, N/A. Precautions: None, N/A. Units of Measurement: None, N/A. Referenced Publications: Garmin GMA 340 Audio Panel Installation Manual, P/N 190-00149-01 Garmin GMA 340 Audio Panel Maintenance Manual, P/N 190-00149-02 Garmin GMA 340 Audio Panel Pilots Guide, P/N 190-00149-00. Garmin GMA 340 STC #SA00710WI Distribution: This document should be a permanent aircraft record. 2. Description of the Alteration Installation of the Garmin GMA 340 Audio Panel, with interface to external transceivers and [include other equipment/systems as appropriate]. Refer to section 2 and interconnect wiring diagrams figures B3 through B6 of this manual for interconnect information. Antenna installation, removal and replacement should be in accordance with applicable provisions of AC43.13-1B and 43.13-2A. 3. Control, Operation Information Refer to the GMA 340 Audio Panel Pilots Guide.

Page A-1 Rev. L

4. Servicing Information N/A 5. Maintenance Instructions Maintenance of the GMA 340 Audio Panel is on condition only. Periodic maintenance is not required. Refer to the GMA 340 Audio Panel Maintenance Manual. 6. Troubleshooting Information Refer to the GMA 340 Audio Panel Maintenance Manual. 7. Removal and Replacement Information Refer to section 2.4 of this manual. If the unit is removed and reinstalled, a functional check of the equipment should be conducted in accordance with section 3 of this manual. 8. Diagrams Refer to Appendix B of this manual. 9. Special Inspection Requirements N/A 10. Application of Protective Treatments N/A 11. Data: Relative to Structural Fasteners Antenna installation, removal and replacement should be in accordance with applicable provisions of AC43.13-1A and 43.13-2A. 12. Special Tools N/A 13. This Section is for Commuter Category Aircraft Only A. Electrical loads: Refer to section 1.3 of this manual. B. Methods of balancing flight controls: N/A. C. Identification of primary and secondary structures: N/A. D. Special repair methods applicable to the airplane: Antenna installation, removal, and replacement should be in accordance with applicable provisions of AC43.13-1B and 43.13-2A. 14. Overhaul Period No additional overhaul time limitations. 15. Airworthiness Limitation Section N/A
16. Revision To revise this ICA, a letter must be submitted to the local FSDO with a copy of the revised FAA Form 337, and revised ICA. The FAA inspector accepts the change by signing Block 3 and including the following statement:
Page A-2 Rev. L GMA 340 Installation Manual 190-00149-01
The attached revised/new Instructions for Continued Airworthiness (date ______) for the above aircraft or component major alteration have been accepted by the FAA, superseding the Instructions for Continued Airworthiness (date ______). 17. Assistance Flight Standards Inspectors have the resources to respond to questions regarding the ICA. 18. Implementation and Record Keeping For major alterations performed in accordance with FAA field approval policy, the owner/operator operating under Part 91 is responsible for ensuring that the ICA is made part of the applicable section 91.409 inspection program for their aircraft. This is accomplished when a maintenance entry is made in the aircrafts maintenance record in accordance with section 43.9. This entry records the major alteration and identifies the original ICA location (e.g., Block 8 of FAA Form 337, dated ______) along with a statement that the ICA is now part of the aircrafts inspection/maintenance requirements.

PASS 1 MIC RETURN PASS 1 MIC PASS 2 MIC RETURN PASS 2 MIC PASS 3 MIC RETURN PASS 3 MIC PASS 4 MIC RETURN PASS 4 MIC MUSIC 1 RETURN MUSIC 1 R MUSIC 1 L MUSIC 2 RETURN MUSIC 2 R MUSIC 2 L SPKR OUT SPKR RETURN

Switch open for mono

13B. IF UNIT MOD 4 IS INCORPORATED, THE ABOVE CONDITIONS STILL REMAIN EXCEPT THAT MOD 4 ENSURES PROPER FAILSAFE OPERATION FOR BOTH STEREO AND MONO HEADSETS WITHOUT REQUIRING A STEREO/MONO SWITCH.
14. WHEN NO AIRCRAFT RADIO ACTIVITY IS DETECTED BY THE GMA 340, THE AMOUNT OF AMBIENT BACKGROUND NOISE FROM THE RADIOS IS FURTHER REDUCED BY THE MASQ CIRCUIT. IF THIS FUNCTION IS NOT DESIRED, THEN J1 PIN 16, MASQ INH SHOULD BE TIED TO GROUND. THIS NOTE DOES NOT APPLY TO THE FOLLOWING GMA 340 SERIAL NUMBERS: 94900000 TO 94900499 AND 96250000 TO 96250399.

Cabin Speaker See note 7

15. THIS NOTE APPLIES ONLY TO UNITS CONFORMING TO MOD LEVEL 1. NORMAL MODE: WHEN THIS PIN IS TIED TO GROUND, TRANSMITTING (KEYING) ON ANY COM WILL CAUSE THE OTHER TWO COM AUDIOS TO BE MUTED DURING THE TRANSMIT. SPLIT COM MODE: WHEN THIS PIN IS TIED TO GROUND, NEITHER COM 1 AUDIO NOR COM 2 AUDIO WILL BE MUTED DURING ANY TRANSMIT. COM 3 AUDIO WILL ONLY BE MUTED WHEN THE PILOT TRANSMITS.
ICS MUTE INHIBIT ICS MUTE INHIBIT RETURN SWAP SWAP RETURN PA MUTE 8 OHM SELECT TONE ENABLE (RESERVED, do not use) AIRCRAFT PWR AIRCRAFT PWR
16. 2 STAGE MOMENTARY SWITCH. FIRST DETENT: KEYED INTERCOM. SECOND DETENT: MICROPHONE AUDIO AND PTT ACTIVE. PROVIDES KEYED INTERCOM IN HIGH NOISE ENVIRONMENTS.

5A 10 11

AIRCRAFT GND AIRCRAFT GND 14V LGT LO / 28V LGT LO 14V LGT HI / 28V LGT LO 14V LGT HI / 28V LGT HI HI MUSIC GAIN SELECT NC NC COM TX MUTE

Mute Trigger to EXT PA

See note 8 See note 9

See note 6

MIC MIC KEY MIC RETURN
FIRST DETENT, (ICS) MICROPHONE HI SECOND DETENT, FULL ACTIVATION (TX)

MICROPHONE LO

Aircraft Power Buss
See note 12 See note 4 See note 4 See note 4 See note 17 See note 15
17. CONNECT TO GROUND FOR TIMES TEN (20 dB) GAIN, OR INSTALL SWITCH TO SELECT BETWEEN UNITY GAIN (0 dB) AND TIMES TEN GAIN (20 dB) FOR MUSIC1 AND MUSIC2. THIS FUNCTION APPLIES ONLY TO UNITS WITH MOD 5 INCORPORATED.

Figure B5. J2 INTERCONNECT WIRING DIAGRAM
Page B-11 (Page B-12 blank) Rev L
COM 1 SPKR LOAD COM 1 SPKR LOAD RETURN See note 3 COM 1 IN COM 1 RETURN COM 1 MIC COM 1 KEY

340 DUAL ADF

COM 1 Transceiver 2. 1.
COM 2 SPKR LOAD COM 2 SPKR LOAD RETURN See note 3 COM 2 IN COM 2 RETURN COM 2 MIC COM 2 KEY
J2 PINS 8, 9. 10, 11 (AWG 22, TEFLON INSULATED) J2 PINS 43, 44 (AWG 22, TEFLON INSULATED) COM 2 Transceiver 4.

See note 3

COM 3 SPKR LOAD COM 3 SPKR LOAD RETURN COM 3 IN COM 3 RETURN COM 3 MIC COM 3 KEY NAV 1 IN NAV 1 RETURN
NAV 1 Radio NAV 2 Radio ADF 1 Radio ADF 2 Radio Altitude Warning Audio Telephone Audio 8. 6.
NAV 2 IN NAV 2 RETURN ADF 1 IN ADF 1 RETURN ADF 2 IN ADF 2 RETURN ALT WRN IN ALT WRN RETURN TEL RINGER IN TEL RINGER RETURN PILOT MIC RETURN PILOT MIC IN PILOT MIC KEY PASS HEADSET RETURN PASS HEADSET R PASS HEADSET L EXT WHITE LAMP (A) EXT BLUE LAMP (O) EXT AMBER LAMP (M) MIDDLE MKR SENS GND LUG MKR ANT MKR ANT RETURN MASQ INH NC
NORMALLY, ANY ICS (INTERCOM) ACTIVITY WILL CAUSE THE MUSIC SOURCE TO BE MUTED. IF THIS IS NOT DESIRED, THEN J2 PIN 13 MUST BE CONNECTED TO J2 PIN 14, EITHER PERMANENTLY, OR VIA A SWITCH.
EXT Indicator FLT CTRL System Marker Beacon Antenna See note 14
11. PINS 31 AND 32 OF J1 ARE UNSWITCHED, UNMUTED INPUTS. PINS 43 AND 44 OF J1 ARE UNSWITCHED INPUTS.
Figure B6. J1 INTERCONNECT WIRING DIAGRAM
Page B-13 (Page B-14 blank) Rev L
PILOT HEADSET RETURN PILOT HEADSET R PILOT HEADSET L COPILOT HEADSET RETURN COPILOT HEADSET R COPILOT HEADSET L COPILOT MIC RETURN COPILOT MIC IN COPILOT MIC KEY*

PTT 36 35

PASS 1 MIC RETURN PASS 1 MIC PASS 2 MIC RETURN PASS 2 MIC PASS 3 MIC RETURN PASS 3 MIC PASS 4 MIC RETURN PASS 4 MIC MUSIC 1 RETURN MUSIC 1 R MUSIC 1 L DME RETURN DME IN
13A. IF GENERAL AVIATION MONOPHONIC HEADSETS HAVING TRUE MONOPHONIC PLUGS ARE USED IN AN INSTALLATION HAVING STEREO HEADPHONE JACKS, THE RING CONDUCTOR WILL BE SHORTED TO THE BARREL CONDUCTOR WHEN THE HEADSET IS PLUGGED IN. THIS WILL NOT DAMAGE THE GMA 340. HOWEVER, THIS WILL PREVENT PROPER FAILSAFE OPERATION. ADDITIONALLY, SINCE THE PASSENGER HEADSETS ARE CONNECTED IN PARALLEL, ALL PASSENGERS WILL LOSE ONE CHANNEL IF A MONO HEADSET IS PLUGGED INTO A PASSENGER POSITION. TO AVOID THIS, STEREO/MONO SWITCHES MAY BE INSTALLED AS SHOWN BELOW. WHEN A MONO HEADSET IS USED, THE SWITCH MUST BE SET TO THE OPEN POSITION. Headset Return Headset R Headset L GMA 340 NOTE 13B APPLIES TO GMA 340 UNITS WITH MOD 4.

 

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