Garmin Cessna Caravan G1000 Manual

G1000

audio panel pilot’s guide

Garmin G1000 Audio Panel Pilot’s Guide 190-00378-02 Rev. A

Record of Revisions

Revision Date of Revision Revision Page Range Description

A 12/01/04 6A-1 – 6A-17 Initial release.

Garmin G1000 Audio Panel Pilot’s Guide190-00378-02 Rev. A 6A-1

INTRODUCTION

6A.1 INTRODUCTION

This manual provides the pilot with a description of

the GMA 1347 and its operating instructions.

The Garmin GMA 1347 is an audio control panel and

marker beacon system. Pressing the audio panel keys

controls audio selection of COM, NAV, telephone and in-

tercom. LED annunciators indicate when a key function

is selected.

NOTE: This audio panel is intended to be used

only as part of the G1000 Integrated Cockpit

System.

The GMA 1347 includes a six-position intercom sys-

tem (ICS) with electronic cabin noise de-emphasis and

two stereo music inputs. Separate knobs for the pilot and

copilot/passenger control intercom audio level. The in-

tercom provides four selectable modes of isolation (All,

Crew, Pilot, Copilot).

A cabin speaker is available to listen to selected aircraft

radios. MASQ (Master Avionics Squelch) processing re-

duces ambient noise from the avionics inputs.

Each microphone input has an automatic squelch

threshold. Manual squelch is available by pressing the

MAN SQ key.

The GMA 1347 provides a digital recorder that can

play back up to two and a half minutes of COM audio.

Recording is automatic when a COM signal is received.

Playback is controlled by pressing the PLAY key. Play-

back can be stopped by pressing the MKR/MUTE key.

The unit controls marker beacon receiver audio and

features marker beacon audio muting.

As part of the G1000 Integrated Cockpit System, the

GMA 1347 also operates the display reversionary mode.

Two GMA 1347 audio panels can be mounted in an

aircraft. In dual panel installations, two (2) units can be

connected to the same radios.

CAUTION: When the GMA 1347 Audio panel is

turned OFF or is inoperative, certain autopilots

are affected. No warning tone is supplied when

the autopilot disengages and the middle marker

sense signal is not supplied.

Garmin G1000 Audio Panel Pilot’s Guide 190-00378-02 Rev. A6A-2

DESCRIPTION

6A.2 UNIT DESCRIPTION

The GMA 1347 features three (3) major groups of keys

as shown in Figure 6A.2.1:

• Communication keys

• Navigation keys

• Intercom system (ICS) keys

Each key is labeled to indicate the name of the func-

tion. The triangular key annunciator above the keys are

white when illuminated.

The knobs at the bottom of the unit control ICS volume

and squelch threshold levels. The small knob adjusts the

volume/squelch level for the pilot. The large knob ad-

justs the volume/squelch level for the copilot/passenger.

The red DISPLAY BACKUP button below the dual vol-

ume/squelch knob controls reversionary mode selection.

FRONT PANEL CONTROLS

• Transceiver audio selector keys

(COM1, COM2, COM3)

• Transmitter (audio/mic) selection keys

(COM1 MIC, COM2 MIC, COM3 MIC)

• Split COM key

(COM 1/2)

• Dedicated telephone interface key

(TEL)

• Passenger address key

(PA)

• Speaker key

(SPKR)

• Marker beacon receiver audio select/mute key

(MKR/MUTE)

• Marker beacon receiver high sensitivity key

(HI SENS)

• Aircraft radio audio selector keys

(NAV1, NAV2, ADF, DME, AUX)

• Intercom manual squelch key

(MAN SQ)

• Digital recording playback key

(PLAY)

• Intercom system (ICS) isolation keys

(PILOT, COPLT)

• Volume/squelch knob

(VOL/SQ)

• Reversionary mode button

(DISPLAY BACKUP)

Garmin G1000 Audio Panel Pilot’s Guide190-00378-02 Rev. A 6A-3

DESCRIPTION

Transmitters Transceiver Audio

Split COM Telephone

Marker Beacon/Mute

Passenger Address

Marker Beacon Signal Sensitivity

Speaker

VOL/SQ

Manual Squelch

Navigation Radio Audio

Reversionary Mode Control

Digital Recording Playback

Navigation Radio Audio

Figure 6A.2.1 Front Panel Controls

ICS Isolation

VOL Annunciation SQ Annunciation

Garmin G1000 Audio Panel Pilot’s Guide 190-00378-02 Rev. A6A-4

DESCRIPTION

TRANSCEIVERS

The GMA 1347 handles three different transceivers:

• COM1 MIC

• COM2 MIC

• COM3 MIC

NOTE: A push-to-talk (PTT) switch must be

pressed to transmit on the selected radio.

Each audio panel can accept up to six (6) microphone

inputs, allowing for a two-person crew and up to four (4)

passenger intercom stations in the aircraft.

MONO/STEREO HEADSETS

The GMA 1347 can accommodate up to six (6) head-

sets, pilot, copilot and up to four (4) passengers.

NOTE: The use of stereo headsets is highly rec-

ommended.

Use of a monaural headset in a stereo jack shorts the

right headset channel output to ground. A person listen-

ing on a monaural headset hears only the left channel in

both ears. If a monaural headset is used at one of the pas-

senger positions, any other passenger listening on a stereo

headset hears audio in the left ear only, unless the headset

has a mono/stereo switch that is set to mono.

UNMUTED/UNSWITCHED INPUTS

The unit provides four (4) unmuted/unswitched in-

puts that are always present on the headsets or speaker.

These inputs are the following aural warnings:

• ALTITUDE WARNING

• UNSWITCHED 1

• UNSWITCHED 2

• UNSWITCHED 3

Garmin G1000 Audio Panel Pilot’s Guide190-00378-02 Rev. A 6A-5

OPERATION

6A.3 UNIT OPERATION

POWER-UP AND FAIL-SAFE OPERATION

Power-up

The GMA 1347 performs a self-test during power-up.

All panel annunciator lights illuminate for approximately

two (2) seconds. Once the self-test is completed, the set-

tings are restored to the ones in use before the unit was

last turned off.

See the System Overview section for additional power

up information.

Fail-safe Operation

A fail-safe circuit connects the pilot’s headset and mi-

crophone directly to COM1 in case power is interrupted

or the unit is turned off. In this case, audio is not available

on the speaker.

SELECTING AND DESELECTING KEYS

LED annunciators indicate when a key function is se-

lected. Pressing a key activates and deactivates the func-

tion, turning the annunciator light on and off.

LIGHTING

LED key annunciators and backlighting are controlled

automatically by the G1000 Control Display Unit (CDU).

TRANSCEIVER KEYS

The following eight (8) transceiver keys appear at the

top of the GMA 1347 front panel: COM1 MIC, COM2

MIC, COM3 MIC, COM 1/2, COM1, COM2, COM3,

and TEL. COM audio can be selected by pressing either

the desired COM key or by pressing a COM MIC key.

Figure 6A.3.1 Transceivers

COM MIC Keys

Pressing the COM1 MIC, COM2 MIC or COM3 MIC

key selects the COM radio as the active transceiver. The

receiver audio key, COM1, COM2, COM3 is also select-

ed. The COM frequency is highlighted green in the active

frequency ﬁeld of the PFD and MFD.

Only one microphone source can be selected at a time.

If COM2 MIC is pressed when COM1 MIC is active, the

unit switches to COM2.

COM Keys

Pressing the COM1, COM2, or COM3 receiver key

selects the COM radio as an active receiver source. Any

combination of radios can be selected separately or simul-

taneously regardless of the active transceiver selection.

The active COM radio is always heard through the head-

sets.

Garmin G1000 Audio Panel Pilot’s Guide 190-00378-02 Rev. A

6A-6

OPERATION

Transmitting

When a transmitter is keyed, the active transceiver

MIC key annunciator blinks approximately once per sec-

ond. A white TX indication appears next to the active

COM frequency on both the PFD and the MFD during

transmission.

NOTE: Audio level of the COM radio(s) is con-

trolled by the COM volume controls located on

both the PFD and MFD (see the VHF NAV/COM

Pilot’s Guide).

COM SWAP

A remotely mounted switch can be used to transfer the

active transceiver between COM1 MIC and COM2 MIC.

Pressing the switch has no effect if COM3 is the active

transceiver.

OPTIONAL COM MUTING

COM muting on receive and COM muting on trans-

mit options can each be disabled if desired. Contact a

Garmin-authorized service center for details.

COM Muting on Receive

When COM muting on receive is enabled, all second-

ary COM audio is muted during detection of received pri-

mary COM audio.

NOTE: If COM muting on receive option is

enabled, only primary COM radio reception is

recorded by the digital clearance recorder.

COM Muting on Transmit

When COM muting on transmit is enabled, all sec-

ondary COM audio is muted during transmission over the

primary COM radio.

TELEPHONE INTERFACE

The GMA 1347 contains a dedicated telephone inter-

face that is closely linked to the ICS operation. It is con-

trolled by the TEL key. See Table 6A.3.3 for a summary

of the telephone distribution and the various ICS isolation

modes.

NOTE: The ringer to the TEL channel is muted

during COM radio transmissions.

SPLIT COM FUNCTION

Pressing the COM 1/2 key selects the split COM func-

tion. During split COM operation, the COM1, COM1

MIC, COM2 and COM2 MIC keys are active.

When the COM 1/2 key is selected, COM1 is used by

the pilot for transmission and COM2 is used by the copi-

lot. The COM1 MIC annunciator blinks when the pilot’s

microphone is keyed and the COM2 MIC annunciator

blinks when the copilot’s microphone is keyed.

In this mode, both the pilot and the copilot can trans-

mit simultaneously over separate radios. The pilot can

still monitor COM3, NAV1, NAV2, DME, ADF, AUX and

MKR audio as selected, but the copilot is only able to

monitor COM2.

Split COM mode is cancelled by pressing the COM 1/2

key again.

NOTE: Split COM performance varies signiﬁcantly

across installations and is affected by both the

distance between the antennas and the separa-

tion of the tuned frequencies.

Garmin G1000 Audio Panel Pilot’s Guide190-00378-02 Rev. A 6A-7

OPERATION

PA FUNCTION

A passenger address function is provided by pressing

the PA key. Push-to-talk (PTT) must be used to deliver PA

announcements over the headsets.

SPEAKER

All of the radios can be heard over the cabin speaker.

Pressing the SPKR key selects and deselects the cabin

speaker. Speaker audio is muted when the PTT switch

is keyed.

The speaker volume is adjustable above and below a

nominal value. Contact a Garmin-authorized service cen-

ter for details.

MARKER BEACON RECEIVER

Description and Operation

The GMA 1347 marker beacon is used as part of the

ILS system. The marker beacon receiver is always ON and

receives at 75 MHz. The GMA 1347 provides a marker

audio muting capability.

The receiver detects the three (3) marker tones, outer,

middle and inner, and illuminates the appropriate mark-

er beacon indicators. The marker indicators are located to

the left of the Altimeter on the PFD (Figure 6A.3.3). The

outer marker frequency is 400 Hz with a blue indicator,

the middle marker frequency is 1,300 Hz with an amber

indicator and the inner marker frequency is 3,000 Hz with

a white indicator. Refer to Table 6A.3.1 for a summary of

the marker beacon signal characteristics.

When the MKR/MUTE key is selected, the annun-

ciator light illuminates and the audio signal can be heard

over the speaker or headsets during marker reception.

When the MKR/MUTE key is annunciated and a mark-

er beacon tone is received, pressing the MKR/MUTE key

mutes the audio but does not affect the annunciators. The

audio returns when the next marker signal is received. If

the MKR/MUTE key is pressed during signal reception,

while marker beacon audio is muted, marker audio and

the MKR/MUTE key annunciator light are turned off.

NOTE: The marker beacon receiver lights operate

independently of the marker beacon audio and

cannot be turned off.

The marker beacon audio output level is adjustable by

a Garmin-authorized service center.

NOTE: The GMA 1347 is capable of driving

external marker beacon lamps.

Marker Beacon Signal Sensitivity

The HI SENS key can be pressed for increased marker

beacon signal sensitivity. The HI SENS function is used

to receive an earlier indication of nearing a marker during

an approach.

Figure 6A.3.2 Marker Beacon

Garmin G1000 Audio Panel Pilot’s Guide 190-00378-02 Rev. A

6A-8

OPERATION

Beacon Audio Frequency Audio Keying Rate Lamp Color

Outer Marker 400 Hz — — — 2 dashes per second Blue

Middle Marker 1,300 Hz • — • — 95 dot-dash combinations

per minute Amber

Airway/Inner Marker 3,000 Hz • • • • 6 dots per second White

Table 6A.3.1 Marker Beacon Signal Characteristics

Inner Marker Middle Marker Outer Marker

Figure 6A.3.3 Marker Beacon Signal Indicator Lights on the PFD

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