Garmin GNC 300 Manual de usuario

Av. Kit Install. Manual

190-00067-02 Rev. J

Page 1

GNC 300

INSTALLATION MANUAL

GARMIN INTERNATIONAL, INC. PART NUMBER: 190-00067-02

1200 E. 151st STREET REVISION J, 30 MARCH 1998

OLATHE, KANSAS 66062-3426

Av. Kit Install. Manual

190-00067-02 Rev. J

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Garmin Corporation

This publication is the proprietary property of Garmin International Inc. It may not

be reproduced or transmitted in any form whether printed or electronic, without the

expressed written consent of Garmin International.

Garmin International, Inc.

1200 E. 151st Street

Olathe, KS 66062

U.S.A.

REVISION RECORD

ECO # Rev. Date of Rev. Description FAA Approval

Initial Rev. A, 01 Oct 1995 Initial release

5074 Rev. B, 05 Jan 1996 Clarify Mid Continent annun units GA 56 Mod 1

5219 Rev. C, 29 Jan 1996 Add MCI options

5827 Rev. D, 18 June 1996 Add STC. Chg to barrel type crimp connectors.

6042 Rev. E, 23 Aug 1996 Chg Fig. 1-3A to agree with MCI's.

6274 Rev. F, 22 Oct 1996 Correct btry pinout chart

7708 Rev. G, 10 Dec 1997 Add antenna, chg btry GPN

8322 Rev. H, 28 Jan 1998 Chg to/from voltage

8452 Rev. J, 30 Mar 1998 Corr to btry pk s/n & misc. chgs.

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TABLE OF CONTENTS

SECTION 1 GENERAL DESCRIPTION

1.1 INTRODUCTION

1.2 TECHNICAL CHARACTERISTICS

1.2.1 PHYSICAL CHARACTERISTICS

1.2.2 OPERATIONAL CHARACTERISTICS

1.2.3 INTERFACES

1.3 LICENCE REQUIREMENTS

SECTION 2 INSTALLATION CONSIDERATIONS

2.1 ANTENNA CONSIDERATIONS

2.1.1 GPS ANTENNA LOCATION

2.1.2 COMM ANTENNA LOCATION

2.1.3 ELECTRICAL BONDING

2.1.4 ANTENNA LIMITATIONS

2.1.5 VHF COMM INTERFERENCE OF GPS

2.1.6 COMM ANTENNA INSTALLATION CONSIDERATIONS

2.2 RACK CONSIDERATIONS

2.2.1 ACCESSIBILITY

2.3 CABLING AND WIRING

2.4 COOLING AIR

2.5 MINIMUM INSTALLATION REQUIREMENTS

2.6 EXTERNAL ALTITUDE INPUT

SECTION 3 INSTALLATION PROCEDURE

3.1 INSTALLATION ACCESSORIES

3.2 ANTENNA INSTALLATION

3.3 CABLE INSTALLATION

3.4 RACK INSTALLATION

3.5 GNC 300 INSTALLATION AND REMOVAL

3.6 COMM ANTENNA INSTALLATION CHECK

SECTION 4 POST INSTALLATION CONFIGURATION &

CHECKOUT PROCEDURE

SECTION 5 CERTIFICATION

SECTION 6 CONTINUED AIRWORTHINESS

APPENDIX A CERTIFICATION DOCUMENTS

APPENDIX B CONNECTOR CHANGES

APPENDIX C STC PERMISSION

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LIST OF ILLUSTRATIONS

FIGURE

1-1 PINOUT DEFINITION, 37 PIN DSUB

1-2 PINOUT DEFINITION, 26 PIN HD-DSUB

1-3 INTERCONNECT SCHEMATIC

1-4 INTERCONNECT SCHEMATIC NOTES

2-1 GPS ANTENNA INSTALLATION CONSIDERATIONS

2-2 GNC 300 INSTALLATION CONSIDERATIONS

2-3 SWITCH/ANNUNCIATOR LAYOUT

3-1 STUD MOUNT GA 56 INSTALLATION

3-2 FLANGE MOUNT GA 56 INSTALLATION

3-3 COAX CABLE INSTALLATION

3-4 AVIATION RACK DIMENSIONS

3-5 AVIATION RACK INSTALLATION

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SECTION 1 GENERAL DESCRIPTION

1.1 INTRODUCTION

This manual describes the physical, mechanical, and electrical characteristics and

the installation requirements for the GNC 300 Aviation Kit.

After installation of the GNC 300 system, FAA Form 337 must be completed by an

appropriately certificated agency to return the aircraft to service.

1.2 TECHNICAL CHARACTERISTICS

The GNC 300 offers the versatility of fixed installation in a panel mounted aviation rack

as well as complete portability.

For TSO Compliance, see Appendix A.

The conditions and tests required for TSO approval of this article are minimum

performance standards. It is the responsibility of those desiring to install this article

either on or within a specific type or class of aircraft to determine that the aircraft

installation conditions are within the TSO standards. The article may be installed only

if further evaluation by the applicant documents an acceptable installation and is

approved by the Administrator.

1.2.1 PHYSICAL CHARACTERISTICS

Width: 6.25 inches

Height: 2 inches

Depth: 5.65 inches

GNC 300 Weight: 2.4 lbs.

GA 56 Antenna Weight: 4 oz.

Aviation Rack Weight: 10 oz.

Max Air Speed: Subsonic

(Structural rating for antenna)

1.2.2 OPERATIONAL CHARACTERISTICS

Operating Temperature Range: -20 oC to +55 oC

Humidity: 95% non-condensing

Altitude Range: -1,500 to 50,000 ft.

Power Range 10 to 15.1 VDC

Power Requirements: 1.2A @ 13.8v (not transmitting)

5.5A @ 13.8V (transmitting)

1.2.3 INTERFACES

The GNC 300 provides interfaces to various general aviation instruments. Figure 1-

1 defines the function of each pin on the 37 pin DSUB connector located at the back

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of the rack. Figure 1-2 defines the function of each pin in the 26 pin HD-DSUB

connector (J102) located above the 37 pin connector at the back of the rack. Figures

1-3 and 1-4 defines the interconnects between the rack and other instruments. The

following interfaces are provided.

1.2.3.1 37 PIN CONNECTOR (J101)

CDI: Capable of driving up to three 1000 ohm parallel

(Pins 1 and 4) loads, +150 millivolts full scale deflection with a

maximum output of +300 millivolts.

To/From: Capable of driving up to three 200 ohm parallel

(Pins 2 and 4) loads, +82 millivolts full scale deflection.

Units with Mod Status 1: +190 millivolts full scale deflec-

tion.

Nav Flag: Capable of driving up to three 1000 ohm parallel

(Pins 3 and 4) loads, 375 millivolts for flag out-of-view, and

+40 millivolts for flag in-view.

OBI data: Output providing bearing to waypoint data for a

(Pins 7, 8, and 23) Bendix/King RMI (KI 229 or equivalent).

Message annunciator: Output capable of driving negative logic message

(Pin 20) annunciators by sinking up to 500mA.

RS232 chan 1 output data: Output capable of driving devices as listed in Section 4.

(Pin 24) Conforms to the EIA specification RS-232C.

RS232 chan 2 output data: Output capable of driving devices as listed in Section 4.

(Pin 19) Conforms to the EIA specification RS-232C.

RS232 chan 1 input data: Input capable of receiving data from devices listed in

(Pin 17) Section 4. Conforms to the EIA specification RS-232C.

Arrival annunciator: Output capable of driving negative logic annunciator

(Pin 12) by sinking up to 500mA.

GPS approach active ann: Output capable of driving negative logic annunciator

(Pin 13) by sinking up to 500mA. See GNC 300 Pilot's Guide,

(GPN 190-00067-00), for more information.

GPS approach arm ann: Output capable of driving negative logic annunciator

(Pin 28) by sinking up to 500mA. See GNC 300 Pilot's Guide,

(GPN 190-00067-00), for more information.

ARINC 429 Output A & B: Output capable of interfacing with any device that has

(Pins 15 and 16) an input conforming to the GAMA ARINC 429 (low

speed) specification.

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NAV Super Flag Output: Output capable of driving positive logic NAV Super

(Pin 10) Flag by sourcing up to 500mA for flag out of view (NAV

valid).

RS422 input: Input capable of receiving serial OBS data from

(Pins 11 & 27) Collins Pro Line 2 EFIS DSP unit.

GPS approach arm low: Input, when grounded, controls approach mode.

(Pin 9)

GPS OBS: Capable of interfacing with a standard OBS resolver.

(Pins 4,14,35 and 37)

ARINC 429 Input A & B: Input capable of receiving data from ARINC 429 (low

(Pins 32 & 33) speed) devices as listed in Section 4.

Battery +,-, Charge Enable Connection for GARMIN remote battery accessory.

(Pins 30, 34, 29)

1.2.3.2 26 PIN CONNECTOR (J102)

MIC Audio Hi and Lo:: Input requiring 275mV RMS into 470 ohm load.

(Pins 2 and 3) (Standard carbon or dynamic MIC containing

transistorized pre-amp.)

MIC Key: Input, when grounded, keys the transmitter.

(Pin4)

COMM Audio Hi and Lo: Output capable of driving a 500 ohm load with

(Pins 5 and 6) 100mW.

MIC Intercomm: Input requiring 125mV RMS into 470 ohm load.

(Pin 8) (Standard carbon or dynamic MIC containing

transistorized pre-amp.)

Remote Transfer: Input, when grounded, swaps the active and

(Pin 10) standby COMM frequencies.

TX Interlock: Input, when grounded, reduces receiver sensitivity

(Pin 12) so squelch will not break when another transceiver is

keyed.

Altimeter input: Capable of receiving encoded output data from any

(Pins 14-24) parallel altimeter device.

Remote Enter: Input, when ground, functions the same as the enter

(Pin 26) key on the GNC 300 front panel.

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Sequence Hold Low: Input, when grounded, activates HOLD mode. See

(Pin 13) the GNC 300 Pilot's Guide (GPN 190-00067-00) for

more information.

1.2.3.3 COMM Antenna Connector (J4)

Capable of providing 5 watts, minimum, at 13.8V. Sensitivity of 6 dB SNR, minimum,

at 2 uV hard. The COMM antenna shall be approved to TSO C37( ) and C38( ).

1.3 LICENCE REQUIREMENTS

The transmitter, as installed in the aircraft, requires an Aircraft Radio Station

Licence. This licence is obtained by filing the FCC Form 404. While awaiting the

receipt of the station licence, a copy of FCC Form 404 is kept in the aircraft.

This equipment has been type accepted by the FCC and entered on the type ac-

cepted equipment list, as GARMIN GNC 300 and must be identified as GARMIN

GNC 300 on your Form 404, Aircraft Radio Station Licence application.

CAUTION

THE VHF TRANSMITTER IN THIS EQUIPMENT IS GUARANTEED TO MEET

FEDERAL COMMUNICATIONS COMMISSION ACCEPTANCE OVER THE OPER-

ATING TEMPERATURE RANGE. MODIFICATIONS NOT EXPRESSLY APPROVED

BY GARMIN COULD VOID THE LICENCES' AUTHORITY TO OPERATE THE

EQUIPMENT.

SECTION 2 INSTALLATION CONSIDERATIONS

Careful planning and consideration of the suggestions in this section are required to

achieve the desired performance and reliability from the GNC 300.

2.1 ANTENNA CONSIDERATIONS

2.1.1 GPS ANTENNA LOCATION

The GNC 300 GA 56 Antenna must be mounted on top of the aircraft. For best

performance select a location with an unobstructed view of the sky above the aircraft

when in level flight. Figure 2-1 illustrates a typical GPS antenna installation.

For rotorcraft, locate the GA 56 antenna:

1) As far from the main rotor hub as possible. This reduces the percentage of time

the blade blocks the antenna.

2) As far below the blade surface as possible if installing the antenna under the blade.

This reduces signal distortion caused by the blades.

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The antenna should be located at least 3 feet from transmitting antennas such as VHF

Comm, HF transmitter, DME, Transponder, and Radar.

2.1.2 COMM ANTENNA LOCATION

The COMM antenna should be well removed from all projections, engines and

propellers. The ground plane surface directly below the antenna should be a flat plane

over as large an area as possible (18 inches square minimum).

The antenna should be mounted a minimum of 6 feet away from any DME antennas,

4 feet from any ADF sense antennas, and a minimum of 3 feet from the GNC 300 and

its GPS antenna.

The GNC 300 COMM antenna connector is specified to have installed GPN 330-00067-

00 (1.57542 GHz notch filter) to minimize interfering harmonics.

2.1.3 ELECTRICAL BONDING

No special precautions need to be taken to provide a bonding path between the GPS

antenna and the aircraft structure.

Follow the manufacturers instructions for the COMM antenna.

2.1.4 ANTENNA LIMITATIONS

GARMIN'S GA 56 Antennas are recommended for installations where the airspeed of

the aircraft will be subsonic.

GARMIN's GA 56, Mod 1 or later, must be used.

See the COMM antenna specification for its limitations.

2.1.5 VHF COMM INTERFERENCE OF GPS

On many panel-mounted aircraft, VHF COMM's can radiate strong harmonics from

the unit and antenna. The GNC 300 COMM section will not interfere with its GPS

section. However, placement of the GNC 300 GPS antenna relative to all COMM's and

COMM antenna, including its own, is critical.

Use the following guidelines, in addition to others in this document, when locating the

GNC 300 and its antennas.

GPS Antenna: Locate as far as possible from all COMM antennas

and all COMMs (including the GNC 300). The GPS

antenna will be much less sensitive to COMM antennas that

use a 1.57542 GHz notch filter.

GNC 300: Locate as far as possible from all COMM antennas.

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If a COMM antenna is found to be the problem, a 1.57542 GHz notch filter (GPN 330-

00067-00) may be installed in the VHF COMM coax, as close to the COMM as possible.

This filter (GPN 330-00067-00) is required for the GNC 300 transmitter).

If a COMM is found to be radiating, the following can be done:

1) Replace or clean VHF COMM rack connector to assure good coax ground.

2) Place a grounding brace between the GNC 300, VHF COMM, and ground.

3) Shield the VHF COMM wiring harness.

2.1.6 COMM ANTENNA INSTALLATION INSTRUCTIONS

The COMM antenna should be installed according to the manufacturer's

recommendations.

2.2 RACK CONSIDERATIONS

2.2.1 ACCESSIBILITY

Plan a location which gives the pilot complete and comfortable access to the entire

keypad and which is plainly visible from the pilots perspective. Check that there is

adequate depth for the rack in the instrument panel. A location away from heating

vents or other sources of heat generation is optimal. Figure 2-2 illustrates a typical

aviation rack installation.

2.3 CABLING AND WIRING

The recommended antenna cable type for both antennas is M17/155-0001 (RG-58A/

U) per MIL-C-17. Maximum allowable length for the GPS antenna using this cable

type is 40 feet. Other cable types with 50 ohms nominal impedance and longer lengths

can be used for the GPS antenna, provided the installer insures that the attenuation

does not exceed 10dB at 1.5 GHz for the specific installation. Check that there is

ample space for the cabling and mating connectors. Avoid sharp bends in cabling,

particularly the COMM antenna cable, and routing near aircraft control cables.

Cabling for the GNC 300 should not be routed near components or cabling which are

sources of electrical noise.

Do not route the COMM antenna cable near any ADF antenna cables.

Route the GPS antenna cable as far as possible away from all COMMs and COMM

antenna cable.

2.4 COOLING AIR

Cooling air is not required for the GNC 300 but is highly recommended because, as

with any electronic equipment, reduced operating temperature can contribute to

increased reliability. Additionally, location of the GNC 300 in a stack of other power

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