Garmin GEA 71 User manual

190-00303-40 June, 2010 Revision F
GEA 71
Installation Manual

Page A GEA 71 Installation Manual
Revision F 190-00303-40
© Copyright 2010
Garmin Ltd. or its subsidiaries
All Rights Reserved
Except as expressly provided herein, no part of this manual may be reproduced, copied, transmitted,
disseminated, downloaded or stored in any storage medium, for any purpose without the express prior
written consent of Garmin. Garmin hereby grants permission to download a single copy of this manual
and of any revision to this manual onto a hard drive or other electronic storage medium to be viewed and
to print one copy of this manual or of any revision hereto, provided that such electronic or printed copy of
this manual or revision must contain the complete text of this copyright notice and provided further that
any unauthorized commercial distribution of this manual or any revision hereto is strictly prohibited.
Garmin International, Inc.
1200 E. 151st Street
Olathe, KS 66062 USA
Telephone: [phone]
Aviation Dealer Technical Support Line (Toll Free): [phone]
www.garmin.com
Garmin (Europe) Ltd.
Liberty House, Bulls Copse Road
Hounsdown Business Park
Southampton, SO40 9RB U.K.
Telephone: +44/ (0) 870.8501241
RECORD OF REVISIONS
Revision Revision
Date Description
A 03/16/04 Production Release
B 09/19/06 Revised to conform to standard, updated manual
C 12/03/07 Updated Mod Level Table
D 06/25/08 Added caution regarding handle screw torque
E 03/11/09 Corrected listed unit and rack weights
F 6/1/10 Changed pins to RESERVED

GEA 71 Installation Manual Page i
190-00303-40 Revision F
CURRENT REVISION DESCRIPTION
Revision Page
Number(s) Section Number Description of Change
1-1 1.3 Changed number of Discrete Annunciator Outputs
to “4”
1-6 1.7 Updated warranty statement
2-1 2.1 Updated AC reference
F
4-3 4.1.2 Changed pins to RESERVED
DOCUMENT PAGINATION
Section Page Range
Table of Contents i – vi
Section 1 1-1 – 1-6
Section 2 2-1 – 2-4
Section 3 3-1 – 3-4
Section 4 4-1 – 4-8
Appendix A A-1 – A-4
Appendix B B-1 – B-4

Page ii GEA 71 Installation Manual
Revision F 190-00303-40
This manual reflects the operation of software version 2.07. Some differences in operation may be
observed when comparing the information in this manual to earlier or later software versions.
INFORMATION SUBJECT TO EXPORT CONTROL LAWS
This document may contain information which is subject to the Export Administration
Regulations ("EAR") issued by the United States Department of Commerce (15 CFR,
Chapter VII, Subchapter C) and which may not be exported, released, or disclosed to
foreign nationals inside or outside of the United States without first obtaining an export
license. The preceding statement is required to be included on any and all reproductions
in whole or in part of this manual.
This product, its packaging, and its components contain chemicals known to the State of
California to cause cancer, birth defects, or reproductive harm. This Notice is being
provided in accordance with California's Proposition 65. If you have any questions or
would like additional information, please refer to our web site at
www.garmin.com/prop65.
WARNING

GEA 71 Installation Manual Page iii
190-00303-40 Revision F
TABLE OF CONTENTS
PARAGRAPH PAGE
1. GENERAL DESCRIPTION..............................................................................................................1-1
1.1 Introduction........................................................................................................................................1-1
1.2 Equipment Description......................................................................................................................1-1
1.3 Interface Summary.............................................................................................................................1-1
1.4 Reference Publications ......................................................................................................................1-1
1.5 Technical Specifications....................................................................................................................1-2
1.6 Certification.......................................................................................................................................1-3
1.7 Limited Warranty...............................................................................................................................1-6
2. INSTALLATION OVERVIEW........................................................................................................2-1
2.1 Introduction........................................................................................................................................2-1
2.2 Installation Materials .........................................................................................................................2-1
2.3 Interface Considerations....................................................................................................................2-2
2.4 Cabling and Wiring............................................................................................................................2-2
2.5 Cooling Air........................................................................................................................................2-2
2.6 Mounting Requirements ....................................................................................................................2-3
3. INSTALLATION PROCEDURE......................................................................................................3-1
3.1 Unpacking Unit..................................................................................................................................3-1
3.2 Wiring Harness Installation ...............................................................................................................3-1
3.3 Backshell Assembly and Installation.................................................................................................3-2
3.4 Thermocouple Installation.................................................................................................................3-2
3.5 Final Installation................................................................................................................................3-2
3.6 Post Installation Configuration and Checkout...................................................................................3-3
3.7 Continued Airworthiness...................................................................................................................3-3
4. SYSTEM INTERCONNECTS..........................................................................................................4-1
4.1 Pin Function List................................................................................................................................4-1
4.2 Electrical Characteristics ...................................................................................................................4-5
APPENDIX A OUTLINE AND INSTALLATION DRAWINGS
APPENDIX B INTERCONNECT EXAMPLES

Page iv GEA 71 Installation Manual
Revision F 190-00303-40
LIST OF ILLUSTRATIONS
FIGURE PAGE
2-1 GEA 71 Unit Rack.............................................................................................................................2-3
3-1 Thermocouple Installation.................................................................................................................3-3
4-1 RTD Daisy-Chain Interconnect Example..........................................................................................4-6
A-1 GEA 71 Outline Drawing.................................................................................................................A-1
A-2 GEA 71 Installation Drawing...........................................................................................................A-3
B-1 GEA 71 Example Interconnect.........................................................................................................B-1
LIST OF TABLES
TABLE PAGE
2-1 Typical Engine/Airframe Sensors......................................................................................................2-2
3-1 Pin Contact Part Numbers..................................................................................................................3-1
3-2 Recommended Crimp Tools..............................................................................................................3-1
3-3 Backshell Installation Instruction Documents ...................................................................................3-2
3-3 Thermocouple Kit (011-00981-00)....................................................................................................3-2
4-1 Analog Input Configuration Summary ..............................................................................................4-5

GEA 71 Installation Manual Page v
190-00303-40 Revision F
GEA 71 HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GEA 71 LRU. 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-to-date 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
SERVICE
BULLETIN
DATE
PURPOSE OF MODIFICATION
1 N/A N/A Improve ability to interface with ungrounded
thermocouples
2 N/A N/A Improve performance when 5 or more constant
current source outputs are enabled

Page vi GEA 71 Installation Manual
Revision F 190-00303-40
This page intentionally left blank

GEA 71 Installation Manual Page 1-1
190-00303-40 Revision F
1 GENERAL DESCRIPTION
1.1 Introduction
This manual presents mechanical and electrical installation requirements for installing the GEA 71 as part
of the Garmin Integrated Flight Deck. The GEA 71 can be integrated into a variety of airframes under an
appropriate TC or STC. Each installation may vary. Use only approved (type or supplemental type) data
for specific installation instructions in a particular aircraft.
1.2 Equipment Description
The GEA 71 is a micro-processor based input/output Line Replaceable Unit (LRU) used to monitor
sensor inputs and drive annunciator outputs for aircraft airframe and engine systems. The GEA 71
interfaces with various sensors on the aircraft and communicates airframe and engine information via
RS-485 digital interface to GIA 63(W) Integrated Avionics Units or IAUs. The GIAs then interface with
the GDU Primary Flight Display(s) (PFD) and Multi-Function Display (MFD). Typically, the MFD
shows engine instrumentation while the PFD normally shows airframe alerts provided by the GEA 71.
Engine/airframe instrumentation is also displayed on the PFD and/or MFD while the system is in
reversionary mode. The PFD and MFD displays serve as the user interface for the GEA 71. All
configuration settings are controlled via software settings accessed by the MFD and PFD displays.
The GEA 71 uses a configuration module temperature sensor and a thermocouple sensor housed in a
backshell assembly to monitor backshell junction temperatures. This capability is only needed in the
event thermocouple engine temperature sensors are used.
1.3 Interface Summary
The following list is an interface summary for the GEA 71 unit:
•18 Analog Inputs (all differential inputs; 4 inputs are current monitor capable, see Section 4)
•12 Engine Temperature Analog Inputs (differential inputs)
•23 Discrete Inputs
•12 Digital Inputs*
•4 Discrete Annunciate Outputs
•2 RS-485 channels that interface to GIA 63 IAUs
•Software & Configuration data input from a Garmin Integrated Flight Deck
•Aircraft Power Input (Power-on controlled by aircraft avionics power bus)
*Note that all digital inputs can also be configured as discrete inputs if desired.

Page 1-2 GEA 71 Installation Manual
Revision F 190-00303-40
1.4 Technical Specifications
It is the responsibility of the installing agency to obtain the latest revision of the GEA 71 Environmental
Qualification Form. This form is available directly from Garmin under the following part number:
GEA 71 Environmental Qualification Form, Garmin part number 005-00147-02
To obtain a copy of this form, see the dealer/OEM portion of the Garmin web site (www.garmin.com).
1.4.1 Physical Characteristics
Characteristic Specification
Width (w/ Rack) 1.23 inches (3.12 cm)
Height (w/ Rack) 6.30 inches (16.0 cm)
Depth (Rack w/ Connectors) 8.73 inches (22.17 cm)
Unit Weight 1.75 lbs (0.79 kg)
Rack, Nutplate, & Connector Kit Weight 0.83 lbs (0.38 kg)
1.4.2 Power Requirements
Characteristic Specification
Input Voltage 14/28 Vdc See the Environmental Qualification Form for
details on surge ratings and minimum/maximum operating
voltages.
Unit Status Max Current @ 28 Vdc Max Current @ 14 Vdc
(Optional)
Off 0.01 A 0.01 A
On 0.15 A 0.30 A
On* 0.50 A 1.00 A
*Full Load On Transducer Power Outputs.
During the first five seconds of unit power-up, current is slightly higher due to backup
capacitors being charged. Estimate initial power-up current to be ~50 mA @ 28 Vdc
higher or ~100 mA @ 14 Vdc higher than the above figures.
1.5 Reference Documents
The following publications are sources of additional information for installing the GEA 71. Before
installing the GEA 71, the technician should read all referenced materials along with this manual.
Part Number Document
190-00303-00 G1000 System Installation Manual
190-00303-04 G1000 Line Maintenance and Configuration Manual
NOTE

GEA 71 Installation Manual Page 1-3
190-00303-40 Revision F
1.6 Certification
The conditions and test required for the TSO approval of this article are minimum performance standards.
It is the responsibility of those installing 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. TSO articles must have
separate approval installation in an aircraft. The article may be installed only if performed under 14 CFR
part 43 or the applicable airworthiness requirements.
At the time of publication, installations of this TSO approved article are only approved when installed in
an aircraft as part of a Garmin Integrated Flight Deck.
1.6.1 TSO/ETSO Compliance
Function TSO/ETSO Category
Applicable LRU
Software Part
Numbers
Fuel Flow Meters TSO-C44b
ETSO-C44b Type I 006-B0193-()
Temperature Instruments TSO-C43c
ETSO-C43c Class IIa 006-B0193-()
Manifold Pressure Instruments TSO-C45a
ETSO-C45a Type II 006-B0193-()
Pressure Instruments-Fuel, Oil, and
Hydraulic
TSO-C47
ETSO-C47 Type II 006-B0193-()
Electric Tachometer TSO-C49b
ETSO-C49b N/A 006-B0193-()
Fuel and Oil Quantity Instruments TSO-C55
ETSO-C55 Types I & II 006-B0193-()

Page 1-4 GEA 71 Installation Manual
Revision F 190-00303-40
1.6.2 TSO/ETSO Deviations
TSO/ETSO Deviation
TSO-C43c 1. Garmin was granted a deviation from TSO-C43c to use SAE AS 8005A in place of
SAE AS 8005 to demonstrate compliance for Temperature Instruments.
2. Garmin was granted a deviation from TSO-C43c section a.2 to use RTCA DO-160D in
place of RTCA DO-160C for the Environmental Standard.
ETSO-C43c 1. Garmin was granted a deviation from ETSO-C43c to use SAE AS 8005A in place of
SAE AS 8005 to demonstrate compliance for Temperature Instruments.
2. Garmin was granted a deviation from ETSO-C43c section a.2 to use RTCA DO-160D in
place of RTCA DO-160C for the Environmental Standard.
TSO-C44b 1. Garmin was granted a deviation from TSO-C44b section a.3 to use RTCA DO-160D in
place of SAE AS 407B for the Environmental Standard.
2. Garmin was granted a deviation from TSO-C44b section b.1 to not display the software
part number on the outside of the unit. Notice 8110.49 paragraph 5-4.d states, “For
airborne equipment having separate part numbers for hardware and software, the
software part number need not be displayed on the outside of the unit, as long as it can
be verified through some kind of electronic query.”
3. Garmin was granted a deviation from TSO-C44b to use SAE AS 407C in place of
SAE AS 407B to demonstrate compliance for Fuel Flowmeters.
ETSO-C44b 1. Garmin was granted a deviation from ETSO-C44b section a.3 to use RTCA DO-160D in
place of SAE AS 407B for the Environmental Standard.
2. Garmin was granted a deviation from ETSO-C44b section b.1 to not display the software
part number on the outside of the unit. Notice 8110.49 paragraph 5-4.d states, “For
airborne equipment having separate part numbers for hardware and software, the
software part number need not be displayed on the outside of the unit, as long as it can
be verified through some kind of electronic query.”
3. Garmin was granted a deviation from ETSO-C44b to use SAE AS 407C in place of
SAE AS 407B to demonstrate compliance for Fuel Flowmeters.
TSO-C45a 1. Garmin was granted a deviation from TSO-C45a section a.4 to use RTCA DO-160D in
place of RTCA DO-160C for the Environmental Standard.
ETSO-C45a 1. Garmin was granted a deviation from ETSO-C45a section a.4 to use RTCA DO-160D in
place of RTCA DO-160C for the Environmental Standard.
TSO-C47 1. Garmin was granted a deviation from TSO-C47 to use SAE AS 408C in place of
SAE AS 408A to demonstrate compliance for Pressure Instruments, Fuel Oil and
Hydraulic.
2. Garmin was granted a deviation from TSO-C47 to use the environmental standards set
forth in RTCA DO-160D in place of the environmental standards set forth in
SAE AS 408C.
ETSO-C47 1. Garmin was granted a deviation from ETSO-C47 to use SAE AS 408C in place of
SAE AS 408A to demonstrate compliance for Pressure Instruments, Fuel Oil and
Hydraulic.
2. Garmin was granted a deviation from ETSO-C47 to use the environmental standards set
forth in RTCA DO-160D in place of the environmental standards set forth in
SAE AS 408C.
TSO-C49b 1. Garmin was granted a deviation from TSO-C49b to use SAE AS 404C in place of
SAE AS 404B to demonstrate compliance for Electric Tachometer Instruments.
2. Garmin was granted a deviation from TSO-C49b section a.3 to use RTCA DO-160D in
place of SAE AS 407B for the Environmental Standard.
ETSO-C49b 1. Garmin was granted a deviation from ETSO-C49b to use SAE AS 404C in place of
SAE AS 404B to demonstrate compliance for Electric Tachometer Instruments.
2. Garmin was granted a deviation from ETSO-C49b section a.3 to use RTCA DO-160D in
place of SAE AS 407B for the Environmental Standard.

GEA 71 Installation Manual Page 1-5
190-00303-40 Revision F
TSO/ETSO Deviations, continued
TSO/ETSO Deviation
TSO-C55 1. Garmin was granted a deviation from TSO-C55 to use SAE AS 405C in place of
SAE AS 405B to demonstrate compliance for Fuel and Oil Quantity Instruments for
Reciprocating Engine Aircraft.
2. Garmin was granted a deviation from TSO-C55 to use the environmental standards set
forth in RTCA DO-160D in place of environmental standards set forth in SAE AS 405C.
ETSO-C55 1. Garmin was granted a deviation from ETSO-C55 to use SAE AS 405C in place of
SAE AS 405B to demonstrate compliance for Fuel and Oil Quantity Instruments for
Reciprocating Engine Aircraft.
2. Garmin was granted a deviation from ETSO-C55 to use the environmental standards set
forth in RTCA DO-160D in place of environmental standards set forth in SAE AS 405C.

Page 1-6 GEA 71 Installation Manual
Revision F 190-00303-40
1.7 Limited Warranty
All Garmin avionics products are warranted to be free from defects in materials or workmanship for: two years from
the date of purchase for new Remote-Mount and Panel-Mount products; one year from the date of purchase for new
portable products and any purchased newly-overhauled products; six months for newly-overhauled products
exchanged through a Garmin Authorized Service Center; and 90 days for factory repaired or newly-overhauled
products exchanged at Garmin in lieu of repair. Within the applicable 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 apply to: (i) cosmetic damage, such as scratches, nicks and dents; (ii) consumable parts, such as
batteries, unless product damage has occurred due to a defect in materials or workmanship; (iii) damage caused by
accident, abuse, misuse, water, flood, fire, or other acts of nature or external causes; (iv) damage caused by service
performed by anyone who is not an authorized service provider of Garmin; or (v) damage to a product that has been
modified or altered without the written permission of Garmin. In addition, Garmin reserves the right to refuse
warranty claims against products or services that are obtained and/or used in contravention of the laws of any
country.
THE WARRANTIES AND REMEDIES CONTAINED HEREIN ARE EXCLUSIVE AND IN LIEU OF ALL
OTHER WARRANTIES, WHETHER EXPRESS, 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 THE 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 (with a new or newly-overhauled replacement product) the
product 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.
Online Auction Purchases: Products purchased through online auctions are not eligible for warranty coverage.
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.
International Purchases: A separate warranty may be provided by international distributors for devices purchased
outside the United States depending on the country. If applicable, this warranty is provided by the local in-country
distributor and this distributor provides local service for your device. Distributor warranties are only valid in the area
of intended distribution. Devices purchased in the United States or Canada must be returned to the Garmin service
center in the United Kingdom, the United States, Canada, or Taiwan for service.
Garmin International, Inc. Garmin (Europe) Ltd.
1200 E. 151st Street Liberty House
Olathe, KS 66062, U.S.A. Bulls Copse Road
Phone: [phone] Hounsdown Business Park
FAX: [phone] Southampton, SO40 9RB, UK
Telephone: [phone]

GEA 71 Installation Manual Page 2-1
190-00303-40 Revision F
2 INSTALLATION OVERVIEW
2.1 Introduction
This section provides hardware equipment information for installing the GEA 71 and related hardware.
Installation of the GEA 71 must follow the aircraft TC or STC requirements. Cabling is fabricated by the
installing agency to fit each particular aircraft. The guidance of FAA advisory circulars AC 43.13-1B and
AC 43.13-2B, where applicable, may be found useful for making retro-fit installations that comply with
FAA regulations.
Refer to the G1000 System Installation Manual, Garmin part number 190-00303-00 for further details on
the mechanical aspects of the Garmin Integrated Flight Deck.
2.2 Installation Materials
The GEA 71 is available only as a single unit under the following part number:
Item Garmin Catalog Part Number
GEA 71 Unit (011-00831-00) 010-00283-00
2.2.1 Equipment Available
Each of the following accessories are provided separately for the GEA 71:
Item Garmin Catalog Part Number
GEA 71 Unit Rack 115-00411-00
G1000 Rack Nutplate Kit 011-00915-00 (preferred) or
011-01148-00
GEA 71 Back Plate (‘A’ Keyplate) 011-00796-00
GEA 71 Connector Kit (Spider) 011-00797-01
GEA 71 Connector Kit (Shield Block) 011-00797-03
Configuration Module Kit 011-00979-00
Thermocouple Kit 011-00981-00

Page 2-2 GEA 71 Installation Manual
Revision F 190-00303-40
2.3 Interface Considerations
The GEA 71 interfaces with the GIA 63(W) IAU and with various sensors on the aircraft. Fabrication of
a wiring harness is required.
2.3.1 Airframe/Engine Sensor Considerations
There are several sensors that are normally found on single- and twin-engine aircraft. The GEA 71 is
designed to interface with such sensors, giving the unit complete configurability for different applications.
Table 2-1 shows typical engine/airframe sensors that can be connected with the GEA 71. Note that this
table is not an all-inclusive list of sensors that can be used.
Table 2-1. Typical Engine/Airframe Sensors
Exhaust Gas Temperature (EGT) Cylinder Head Temperature (CHT)
Oil Pressure Oil Temperature
Fuel Flow Fuel Level (L/R)
Manifold Air Pressure (MAP) Engine RPM
Alternator/Volts Meter Amps
Door Open/Closed Annunciation Pitot Heat Annunciation
Low/High Compressor RPM (N1, N2) Generator Power
2.3.2 Engine/Airframe Sensor Installation
Engine/airframe sensors to be used must be approved by the aircraft manufacturer and Garmin. Follow
the sensor manufacturer recommended installation procedures. Wires routed too close to spark plugs,
plug wires, or magnetos may result in erratic readings. Ensure that EGT, CHT, and other sensor wires do
not come in contact with exhaust manifolds or any other extreme heat sources. Give proper attention to
each sensor’s requirements for polarity, voltage, wire type, and mounting.
2.4 Cabling and Wiring
Use AWG #24 or larger wire for all connections unless otherwise specified by the aircraft manufacturer
or Garmin. The standard pin contacts supplied in the connector kit are compatible with up to AWG #22
wire. In cases where some installations have more than one unit sharing a common circuit breaker, sizing
and wire gauge is based on aircraft circuit breaker layout, length of wiring, current draw of units, and
internal unit protection characteristics. Do not attempt to combine more than one unit on the same circuit
breaker unless it is specified on aircraft manufacturer approved drawings.
In some cases, a larger gauge wire such as AWG #16, #18, or #20 may be needed for power connections.
Special thin-wall heat shrink tubing is also provided to insulate the extended barrels inside the backshell.
If using #16 or #18 barrel contacts, ensure that no two contacts are mounted directly adjacent to each
other. This minimizes the risk of contacts touching and shorting to adjacent pins and to ground.
Ensure that routing of the wiring does not come in contact with sources of heat, RF or EMI interference.
Check that there is ample space for the cabling and mating connectors. Avoid sharp bends in cabling and
routing near aircraft control cables.
2.5 Cooling Air
Refer to the G1000 System Installation Manual, Garmin part number 190-00303-00, for information on
cooling requirements.

GEA 71 Installation Manual Page 2-3
190-00303-40 Revision F
2.6 Mounting Requirements
The GEA 71 mounting surface should be capable of providing a sufficient electrical bond to the aircraft to
minimize radiated EMI and provide protection from High-Intensity Radiation Fields (HIRF). The
GEA 71 can be mounted using the G1000 main system rack, or the unit may be mounted remotely if
desired. Figure 2-1 shows the GEA 71 unit rack.
The unit rack is fastened to the main system rack using the nutplate kit listed in Section 2.2.1. Refer to
the Figure A-2 GEA 71 Installation Drawing, for nutplate placement locations.
The installer must provide any additional remote mounting equipment.
Figure 2-1. GEA 71 Unit Rack

Page 2-4 GEA 71 Installation Manual
Revision F 190-00303-40
This page intentionally left blank

GEA 71 Installation Manual Page 3-1
190-00303-40 Revision F
3 INSTALLATION PROCEDURE
3.1 Unpacking Unit
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.
3.2 Wiring Harness Installation
Allow adequate space for installation of cables and connectors. The installer shall supply and fabricate all
of the cables. All electrical connections are made through two 78-pin D-Subminiature connectors
provided by Garmin.
Section 4 defines the electrical characteristics of all input and output signals. Required connectors and
associated hardware are supplied with the connector kit (Refer to Section 2.2.1). See Appendix B for
examples of interconnect wiring diagrams. Construct the actual harnesses in accordance with aircraft
specific approved interconnect diagrams.
Table 3-1. Pin Contact Part Numbers
78 pin D-Subminiature connector (P701, 702)
Manufacturer 16 AWG
(Power Only) 18-20 AWG (Power Only) 22-28 AWG
Garmin P/N 336-00044-01 336-00044-00 336-00021-00
Military P/N N/A N/A M39029/58-360
AMP N/A N/A 204370-2
Positronic N/A N/A MC8522D
ITT Cannon N/A N/A 030-2042-000
Table 3-2. Recommended Crimp Tools
18-20 AWG 22-28 AWG
Manufacturer Hand Crimping
Tool Positioner Insertion/
Extraction Tool
(note 2)
Positioner Insertion/
Extraction
Tool
Military P/N M22520/2-01 N/A M81969/1-04 M22520/2-09 M81969/1-04
Positronic 9507 9502-11 M81969/1-04 9502-4 M81969/1-04
ITT Cannon 995-0001-584 N/A N/A M22520/2-09 274-7048-000
AMP 601966-1 N/A 91067-1 601966-6 91067-1
Daniels AFM8 K774 M81969/1-04 K42 M81969/1-04
Astro 615717 N/A M81969/1-04 615725 M81969/1-04
NOTES
1. Non-Garmin part numbers shown are not maintained by Garmin and consequently are subject
to change without notice.
2. Extracting the #16, #18 and #20 contact requires that the expanded wire barrel be cut off from
the contact. It may also be necessary to push the pin out from the face of the connector when
using an extractor due to the absence of the wire. A new contact must be used when
reassembling the connector.
3. For applications using 16 AWG wire, contact Garmin for information regarding connector
crimp positioner tooling.

Page 3-2 GEA 71 Installation Manual
Revision F 190-00303-40
3.3 Backshell Assembly and Installation
The GEA 71 connector kit includes two Garmin backshell assemblies. The backshell assemblies house
the configuration module/temperature sensor. Garmin’s backshell also gives the installer the ability to
easily terminate shield grounds at the backshell housing using one of two methods available (SPIDER or
Shield Block). To assemble the backshell and configuration module refer to instructions provided in
Table 3-3. The documents listed in Table 3-3 are available via the Dealer portion of the Garmin website
(www.garmin.com).
Table 3-3. Backshell Installation Instruction Documents
Document Garmin Part Number
G1000 System Installation Manual 190-00303-00
G1000 Configuration Module Instructions into a Backshell 190-00313-02
G1000 SPIDER Installation Instructions 190-00313-03
G1000 Shield Block Installation Instructions 190-00313-09
Information about the SPIDER grounding system is provided in support of existing
installations. All new installations shall use the SHIELD BLOCK grounding system.
3.4 Thermocouple Installation
The backshell assembly also houses a thermocouple reference junction (needed only if the GEA 71 is to
monitor temperatures using thermocouple sensors). The thermocouple kit is available separately as
Garmin part number 011-00981-00. Refer to the Thermocouple Installation into a Backshell document
(190-00313-01) available via the Dealer portion of the Garmin website (www.garmin.com) for
thermocouple installation instructions.
3.5 Final Installation
For final installation and assembly, refer to the outline and installation drawings shown in Appendix A of
this manual.
1. Assemble the connector backshells as described in Sections 3.3 and 3.4.
2. Connect both connectors to the rear plate using the screws provided in the connector kit.
3. Mount the unit rack to the main system rack or other suitable mounting location using the provided
nutplates.
4. Assemble the rear plate into the GEA 71 unit rack.
5. Insert the GEA 71 into the rack, noting proper orientation as shown on the installation drawing in
Appendix B.
CAUTION
Do not use excessive force when inserting the GEA 71 into the rack. This may cause
damage to occur to the connectors, unit, and/or unit rack. If heavy resistance is felt
during installation, stop! Remove the GEA 71 and identify the source of resistance. The
rear plate is designed to float in the unit rack. Check to ensure the rear plate is not bound
by the connector harness.
NOTE