Garmin GNC 250 Manuel utilisateur

Av. Kit Install. Manual

190-00067-62 Rev. E

Page 1

GNC 250/GNC 250XL/GPS 150XL

INSTALLATION MANUAL

GARMIN INTERNATIONAL, INC. PART NUMBER: 190-00067-62

1200 E. 151st STREET REVISION E, 3 APRIL 1998

OLATHE, KANSAS 66062-3426

Av. Kit Install. Manual

190-00067-62 Rev. E

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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, 16 Dec 1996 Initial release

6811 Rev. B, 07 Mar 1997 Enhance Cooling Air Section

7708 Rev. C, 10 Dec 1997 Add ant note & STC; Chg btry GPN

8322 Rev. D, 28 Jan 1998 Chg to/from voltage, install dwg

8452 Rev. E, 3 April 1998 Corr to btry pk s/n & misc chgs

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190-00067-62 Rev. E

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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 (GNC 250/GNC 250XL only)

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 ANNUNCIATORS

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 UNIT INSTALLATION AND REMOVAL

3.6 COMM ANTENNA INSTALLATION CHECK (GNC 250/GNC

250XL only)

3.7 PLACARD

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 (GNC 250/GNC 250XL only)

1-3 INTERCONNECT SCHEMATIC

1-4 INTERCONNECT SCHEMATIC NOTES

2-1 GPS ANTENNA INSTALLATION CONSIDERATIONS

2-2 UNIT INSTALLATION CONSIDERATIONS

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 250, GNC 250XL and GPS 150XL Aviation Kits.

Unless stated otherwise, information found in this manual is applicable to the GNC 250,

GNC 250XL and GPS 150XL.

In this manual UNIT refers to any of the above units.

1.2 TECHNICAL CHARACTERISTICS

All UNITS offer 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 on

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

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

evaluation by the user/installer 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

Unit Weight: (See Figure 3-4)

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.

Voltage Range: (GNC 250/GNC 250XL) 10 to 15.1V DC

Voltage Range: (GPS 150XL) 10 to 33V DC

Power Requirements:(GNC 250/GNC 250XL)1.35A @ 13.8v (not transmitting)

5.5A @ 13.8V (transmitting)

Power Requirements: (GPS 150XL) 0.95A @ 13.8V

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1.2.3 INTERFACES

The UNIT 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 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.

RS232 chan 2 input data: Input capable of receiving data from devices listed in

(Pin 18) 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.

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

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).

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

(Pins 30, 34, 29)

1.2.3.2 26 PIN CONNECTOR (J102) (GNC 250/GNC 250XL only)

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.

(Pin 4)

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

(Pins 5 and 6) 100mW.

MIC Intercomm: Input requiring 125 mV 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 so

(Pin 12) 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 UNIT front panel.

1.2.3.3 COMM Antenna Connector (J4) (GNC 250/GNC 250XL only)

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

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

1.3 LICENCE REQUIREMENTS

If any of these devices are used in home or in office, connected to a personal computer,

then the below 4 paragraphs are applicable.

These devices comply with Part 15 of the FCC limits for Class B digital devices. This

equipment generates, uses and can radiate radio frequency energy and if not

installed and used in accordance with the instructions, may cause harmful

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interference to radio communications. However, there is no guarantee that

interference will not occur in a particular installation. If this equipment does cause

harmful interference to other equipment, which can be determined by turning the

equipment off and on, the user is encouraged to try and correct the interference

by relocating the equipment or connecting the equipment to a different circuit

than the affected equipment. Consult an authorized dealer or other qualified

avionics service technician for additional help if these remedies do not correct the

problem. These devices comply with Part 15 of the FCC rules. Operation is subject

to the following conditions: (1) This device may not cause harmful interference,

and (2) this device must accept any interference received, including interference

that may cause undesired operation.

These units do not contain any user-serviceable parts. Repairs should only be

made by an authorized GARMIN service center. Unauthorized repairs or

modifications could void your warranty and your authority to operate this device

under Part 15 Regulations.

FCC requires GARMIN to inform users that these units meet the more stringent

requirements For Home or Office Use.

The following guidance is provided to help ensure the proper licensing of the GNC 250

and GNC 250XL COMM.

1) Telecommunications Act of 1996 effective February 8, 1996 provides the FCC

discretion to eliminate radio station license requirements for aircraft. At present,

and individual license to operate the GNC 250XL and GNC 250 aboard a private

aircraft is not needed in many circumstances. Please see FCC Fact Sheet PR5000

or contact the FCC at 800 322-1117 for more information.

2) No license change is required for an aircraft which already has a station license

per FCC 404 Instructions dated 1994.

3) If an aircraft license is required or desired contact the FCC at 800 322-1117 to

request FCC form 404, Application for Aircraft Radio Station License to apply for

FCC authorization. FCC also has a Fax on Demand service to provide forms by

fax at 202-418-0177.

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 UNIT.

2.1 ANTENNA CONSIDERATIONS

2.1.1 GPS ANTENNA LOCATION

The UNITS 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.

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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.

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 (GNC 250/GNC 250XL only)

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 UNITS and

its GPS antenna.

The UNITS 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. (GNC 250/GNC

250XL only)

2.1.4 ANTENNA LIMITATIONS

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

the aircraft will be subsonic.

See the COMM antenna specification for its limitations. (GNC 250/GNC 250XL only)

2.1.5 VHF COMM INTERFERENCE OF GPS

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

both the comm itself and its antenna. The GNC 250/GNC 250XL COMM section will

not interfere with its GPS section. However, placement of the UNITS 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 UNIT and its antennas.

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

COMMs (including the GNC 250/GNC 250XL). The GPS

antenna will be much less sensitive to COMM antennas

that use a 1.57542 GHz notch filter.

UNIT: Locate as far as possible from all COMM antennas.

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 250/GNC 250XL 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 250/GNC 250XL/GPS 150XL,

VHF COMM, and ground.

3) Shield the VHF COMM wiring harness.

2.1.6 COMM ANTENNA INSTALLATION INSTRUCTIONS (GNC 250/GNC 250XL only)

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 (GNC 250/GNC 250XL only), and routing near

aircraft control cables.

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

sources of electrical noise.

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