Garmin GPS 400W User manual

190-00356-02 November 2006 Rev. A
GNC and GNS are trademarks of Garmin Ltd. or its subsidiaries and may not be used
without the express permission of Garmin.
®
Garmin International, Inc.
400W SERIES
INSTALLATION MANUAL
GPS 400W, GNC
TM
420W/420AW, and GNS
TM
430W/430AW

400W Series Installation Manual
190-00356-02 Rev. A

400W Series Installation Manual Page A
190-00356-02 Rev. A
© Copyright 2006
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 Panel-Mount Technical Support Line (Toll Free): 1-888-606-5482
Web Site Address: www.garmin.com
Garmin (Europe) Ltd.
Unit 5, The Quadrangle
Abbey Park Industrial Estate
Romsey, SO51 9DL U.K.
Telephone: [phone]
RECORD OF REVISIONS
Revision Revision
Date
Description ECO #
1 8/25/06 Initial Release ----
2 10/11/06 Corrections and addition of WAAS antenna,
deviation data and incorporated FAA comments.
40616
A 11/2/06 Production Release 41069

Page B 400W Series Installation Manual
Rev. A 190-00356-02
DOCUMENT PAGINATION
Section Pagination
Table of Contents i - viii
Section 1 1-1 through 1-16
Section 2 2-1 through 2-10
Section 3 3-1 through 3-10
Section 4 4-1 through 4-22
Section 5 5-1 through 5-42
Section 6 6-1 through 6-4
Section 7 7-1 through 7-2
Section 8 8-1 through 8-2
Appendix A A-1 through A-2
Appendix B B-1 through B-2
Appendix C C-1 through C-2
Appendix D D-1 through D-4
Appendix E E-1 through E-6
Appendix F F-1 through F-8
Appendix G G-1 through G-6
Appendix H H-1 through H-45

400W Series Installation Manual Page i
190-00356-02 Rev. A
This manual reflects the operation of Main Software version 2.00. Some differences in operation may be
observed when comparing the information in this manual to 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. A violation of the EAR may be subject to a penalty of up
to 10 years imprisonment and a fine of up to $1,000,000 under Section 2410 of the Export Administration
Act of 1979. Include this notice with any reproduced portion of this document.
WARNING
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.

Page ii 400W Series Installation Manual
Rev. A 190-00356-02
TABLE OF CONTENTS
PARAGRAPH PAGE
1.
GENERAL DESCRIPTION ........................................................................................................ 1-1
1.1 Introduction.................................................................................................................................. 1-1
1.2 Scope............................................................................................................................................ 1-2
1.3 Equipment Description................................................................................................................. 1-2
1.4 Technical Specifications .............................................................................................................. 1-3
1.5 License Requirements................................................................................................................ 1-11
1.6 Regulatory Compliance.............................................................................................................. 1-12
1.7 Database Options and Updates................................................................................................... 1-14
1.8 Fault Detection and Exclusion (FDE)........................................................................................ 1-15
1.9 Limited Warranty....................................................................................................................... 1-15
2. INSTALLATION OVERVIEW................................................................................................... 2-1
2.1 Introduction.................................................................................................................................. 2-1
2.2 Minimum System Configuration.................................................................................................. 2-1
2.3 External Sensors........................................................................................................................... 2-2
2.4 Antenna Considerations ............................................................................................................... 2-3
2.5 Mounting Considerations............................................................................................................. 2-6
2.6 Cabling and Wiring Considerations........................................................................................... 2-10
2.7 Air Circulation and Cooling....................................................................................................... 2-10
2.8 Compass Safe Distance.............................................................................................................. 2-10
3. INSTALLATION PROCEDURES.............................................................................................. 3-1
3.1 Unit and Accessories.................................................................................................................... 3-1
3.2 Optional Accessories.................................................................................................................... 3-2
3.3 Database Options ......................................................................................................................... 3-2
3.4 Miscellaneous Options................................................................................................................. 3-2
3.5 Optional Reference Material........................................................................................................ 3-2
3.6 Installation Materials Required but Not Provided ....................................................................... 3-2
3.7 Special Tools Required................................................................................................................ 3-3
3.8 Cable Installation ......................................................................................................................... 3-4
3.9 Equipment Mounting.................................................................................................................... 3-6
3.10 Antenna Installation and Connection........................................................................................... 3-7
3.11 Weight and Balance ..................................................................................................................... 3-8
3.12 Electrical Load Analysis .............................................................................................................. 3-9
4. SYSTEM INTERCONNECTS .................................................................................................... 4-1
4.1 Pin Function List.......................................................................................................................... 4-1
4.2 Power, Lighting, and Antennas.................................................................................................... 4-5
4.3 Altitude Gray Code ...................................................................................................................... 4-6
4.4 Main Indicator.............................................................................................................................. 4-7
4.5 Annunciators/Switches................................................................................................................. 4-9
4.6 Serial Data.................................................................................................................................. 4-12

400W Series Installation Manual Page iii
190-00356-02 Rev. A
4.7
COM/VOR/ILS Audio (GNC 420W and GNS 430W only)...................................................... 4-16
4.8 VOR/ILS Indicator (GNS 430W Only)...................................................................................... 4-18
4.9 RMI/OBI .................................................................................................................................... 4-20
4.10 DME Tuning (GNS 430W Only)............................................................................................... 4-21
5. POST INSTALLATION CONFIGURATION & CHECKOUT PROCEDURES....................... 5-1
5.1 Mounting and Wiring Check........................................................................................................ 5-1
5.2 Connector Engagement Check..................................................................................................... 5-1
5.3 Configuration Mode Operations .................................................................................................. 5-1
5.4 Ground Checks (Configuration Mode) ...................................................................................... 5-23
5.5 Ground Checks (Normal Mode)................................................................................................. 5-26
5.6 Flight Checks.............................................................................................................................. 5-36
5.7 Database Check.......................................................................................................................... 5-37
5.8 Airplane Flight Manual Supplement Checks............................................................................. 5-38
6. TROUBLESHOOTING............................................................................................................... 6-1
6.1 Troubleshooting Procedure.......................................................................................................... 6-1
6.2 Contacting the Factory for Assistance ......................................................................................... 6-3
7. LIMITATIONS ............................................................................................................................ 7-1
7.1 Operations .................................................................................................................................... 7-1
7.2 Installation.................................................................................................................................... 7-2
7.3 Rotorcraft Installation .................................................................................................................. 7-2
7.4 Aircraft Radio Station License..................................................................................................... 7-2
8. PERIODIC MAINTENANCE ..................................................................................................... 8-1
8.1 Equipment Calibration ................................................................................................................. 8-1
8.2 VOR Checks................................................................................................................................. 8-1
8.3 Cleaning ....................................................................................................................................... 8-1
8.4 Battery Replacement .................................................................................................................... 8-1
APPENDIX A ENVIRONMENTAL QUALIFICATION FORM......................................................A-1
APPENDIX B STC DATA.................................................................................................................B-1
B.1 STC Information ..........................................................................................................................B-1
B.2 STC Permission............................................................................................................................B-1
B.3 Continued Airworthiness Instructions .........................................................................................B-1
B.4 STC Approved Model List...........................................................................................................B-1
APPENDIX C RESERVED................................................................................................................C-1
APPENDIX D 400W SERIES RS-232 AVIATION DATA FORMAT.............................................D-1
D.1 Electrical Interface.......................................................................................................................D-1
D.2 General Output Format ................................................................................................................D-1
D.3 Output Sentence Type 1...............................................................................................................D-1
D.4 Output Sentence Type 2...............................................................................................................D-3
APPENDIX E 400W SERIES RS-232 FUEL/AIR DATA INPUT FORMAT..................................E-1
E.1 Electrical Interface.......................................................................................................................E-1
E.2 Shadin Altitude Sentence.............................................................................................................E-1
E.3 Icarus Altitude Sentence ..............................................................................................................E-1

Page iv 400W Series Installation Manual
Rev. A 190-00356-02
E.4
Shadin Fuel Flow Sentence..........................................................................................................E-2
E.5 ARNAV / EI Fuel Flow Sentence................................................................................................E-2
E.6 Shadin Fuel/Air Data Computer Sentence...................................................................................E-3
APPENDIX F MECHANICAL DRAWINGS.................................................................................... F-1
F.1. Drawing List................................................................................................................................. F-1
APPENDIX G APPROVED EQUIPMENT .......................................................................................G-1
G.1. Audio Panels ................................................................................................................................G-1
G.2. Air Data Computer.......................................................................................................................G-1
G.3. Altitude Serializer or Fuel/Air Data.............................................................................................G-1
G.4. Autopilots.....................................................................................................................................G-2
G.5. Encoding Altimeter or Blind Encoder (Gray Code) ....................................................................G-2
G.6. EFIS Displays...............................................................................................................................G-2
G.7. EHSI.............................................................................................................................................G-2
G.8. IRU/AHRS ...................................................................................................................................G-3
G.9. NAV Indicator..............................................................................................................................G-3
G.10. Weather, Traffic and Terrain .......................................................................................................G-4
G.11. DME.............................................................................................................................................G-4
G.12. CDI/HSI Source Selection Annunciators.....................................................................................G-5
APPENDIX H STC APPROVED INSTALLATION DIAGRAMS...................................................H-1
H.1 Introduction..................................................................................................................................H-1
H.2 Drawing List.................................................................................................................................H-1

400W Series Installation Manual Page v
190-00356-02 Rev. A
LIST OF FIGURES
Figure 2-1. GPS Antenna and Unit Installation Considerations .............................................................. 2-5
Figure 2-2. Source Selection Annunciation Field of View...................................................................... 2-8
Figure 2-3. GPS Navigation Annunciation Field of View....................................................................... 2-9
Figure 3-1. Coaxial Cable Installation ..................................................................................................... 3-4
Figure 5-1. MAIN ARINC 429 CONFIG Page........................................................................................ 5-2
Figure 5-2. MAIN RS-232 CONFIG Page............................................................................................... 5-5
Figure 5-3. MAIN SYSTEM CONFIG Page ........................................................................................... 5-6
Figure 5-4. MAIN SYSTEM CONFIG Page ........................................................................................... 5-7
Figure 5-5. MAIN SYSTEM CONFIG Page ........................................................................................... 5-7
Figure 5-6. MAIN INPUTS 1 Page.......................................................................................................... 5-8
Figure 5-7. MAIN INPUTS 2 Page.......................................................................................................... 5-8
Figure 5-8. INSTRUMENT PANEL SELF-TEST Page.......................................................................... 5-9
Figure 5-9. MAIN LIGHTING Page........................................................................................................ 5-9
Figure 5-10. MAIN LIGHTING Page.................................................................................................... 5-10
Figure 5-11. DATE/TIME SETUP Page................................................................................................ 5-10
Figure 5-12. MAIN DISCRETE INPUTS Page..................................................................................... 5-11
Figure 5-13. MAIN DISCRETE OUTPUTS Page................................................................................. 5-11
Figure 5-14. MAIN CDI/OBS CONFIG Page ....................................................................................... 5-12
Figure 5-15. COM SETUP Page............................................................................................................ 5-14
Figure 5-16. VOR DISCRETE INPUTS Page....................................................................................... 5-15
Figure 5-17. VOR/LOC/GS CDI Page................................................................................................... 5-15
Figure 5-18. VOR/LOC/GS ARINC 429 CONFIG Page....................................................................... 5-17
Figure 5-19. Measurement of GPS Vertical Offset................................................................................5-18
Figure 5-20. GPS Vertical Offset Page.................................................................................................. 5-18
Figure 5-21. STORMSCOPE CONFIG Page......................................................................................... 5-19
Figure 5-22. STORMSCOPE TEST Page..............................................................................................5-19
Figure 5-23. STORMSCOPE DOWNLOAD DATA Page.................................................................... 5-19
Figure 5-24. TRAFFIC Page (SkyWatch).............................................................................................. 5-20
Figure 5-25. TRAFFIC Page (TCAD).................................................................................................... 5-20
Figure 5-26. RYAN TCAD CONFIG Page............................................................................................ 5-21
Figure 5-27. GAD 42 CONFIG Page..................................................................................................... 5-21
Figure 5-28. GDL CONFIG Page........................................................................................................... 5-21
Figure 5-29. Data Link Diagnostics ....................................................................................................... 5-22
Figure F-1. 400W Series Mounting Rack Dimensions ............................................................................ F-3
Figure F-2. GNS 430W Mounting Rack Installation ............................................................................... F-4
Figure F-3. GNC 420W Mounting Rack Installation............................................................................... F-5
Figure F-4. GPS 400W Mounting Rack Installation................................................................................F-6
Figure F-5. 400W Series Recommended Panel Cutout Dimensions........................................................ F-7
Figure H-1. 400W Series System Interface Diagram...............................................................................H-3
Figure H-2. GNS 430W Typical Installation ...........................................................................................H-4
Figure H-3. GNC 420W Typical Installation...........................................................................................H-6
Figure H-4. GPS 400W Typical Installation............................................................................................H-8
Figure H-5. Power, Lighting, and Antenna Interconnect.......................................................................H-10
Figure H-6. Gray Code Altimeter Interconnect......................................................................................H-13
Figure H-7. Main Indicator Interconnect ...............................................................................................H-14
Figure H-8. KI 209A Main Indicator Interconnect ................................................................................H-15
Figure H-9. KI 208A Main Indicator Interconnect ................................................................................H-16
Figure H-10. RS-232 Serial Data Interconnect ......................................................................................H-17

Page vi 400W Series Installation Manual
Rev. A 190-00356-02
Figure H-11. ARINC 429 EFIS Interconnect.........................................................................................H-18
Figure H-12. ARINC 429 Sandel EHSI Interconnect (One 400W Series Unit, One Sandel SN3308)..H-19
Figure H-13. ARINC 429 Sandel EHSI Interconnect (Two GNS 430W, One Sandel SN3308)...........H-21
Figure H-14. ARINC 429 Sandel EHSI Interconnect (Two GNS 430W, Two Sandel SN3308) ..........H-23
Figure H-15. ARINC 429/RS-232 Air Data/IRU/AHRS Interconnect ..................................................H-24
Figure H-16. Traffic Advisory System Interconnect..............................................................................H-26
Figure H-17. GTX 330 Interconnect......................................................................................................H-28
Figure H-18. Weather and Terrain Interconnect....................................................................................H-29
Figure H-19. Audio Panel Interconnect .................................................................................................H-31
Figure H-20. VOR/ILS Indicator Interconnect ......................................................................................H-33
Figure H-21. RMI/OBI Interconnect......................................................................................................H-34
Figure H-22. King Serial Panel DME Tuning Interconnect...................................................................H-35
Figure H-23. King Serial Remote DME Tuning Interconnect...............................................................H-36
Figure H-24. Parallel 2 of 5 DME Tuning Interconnect ........................................................................H-37
Figure H-25. Bendix/King Analog Autopilot Interconnect ...................................................................H-38
Figure H-26. Century Autopilot Interconnect........................................................................................H-39
Figure H-27. S-TEC Autopilot Interconnect..........................................................................................H-40
Figure H-28. ARINC 429 Sandel EHSI Interconnect (One 400W, One Sandel SN3500).....................H-41
Figure H-29. External Navigation Source and GPS Annunciators........................................................H-43
LIST OF TABLES
Table 1-1. 400W Series Units.................................................................................................................. 1-1
Table 1-2. Antennas Without Operational Limitations.......................................................................... 1-10
Table 1-3. Antennas With Operational Limitations................................................................................1-10
Table 1-4. TSO Authorization................................................................................................................ 1-12
Table 3-1. Catalog Part Numbers............................................................................................................. 3-1
Table 3-2. Standard Kit Accessories........................................................................................................ 3-1
Table 3-3. Recommended Crimp Tools (or Equivalent).......................................................................... 3-3
Table 3-4. Pin Contact Part Numbers....................................................................................................... 3-5
Table 3-5. Unit Weights........................................................................................................................... 3-8
Table 3-6. 400W Series Power Input ....................................................................................................... 3-9
Table 5-1. GNS 400W Series Post-Installation Checkout Log.............................................................. 5-39
Table 6-1. Troubleshooting Guide........................................................................................................... 6-1
Table A-1. Environmental Qualification Form Part Numbers.................................................................A-1

400W Series Installation Manual Page vii
190-00356-02 Rev. A
400W SERIES HARDWARE MOD LEVEL HISTORY
The following table identifies hardware modification (Mod) Levels for the GPS 400W, GNC 420W
and GNS 430W. 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

Page viii 400W Series Installation Manual
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This Page Intentionally Left Blank

400W Series Installation Manual Page 1-1
190-00356-02 Rev. A
1. GENERAL DESCRIPTION
1.1 Introduction
This manual describes the physical, mechanical, and electrical characteristics, as well as instructions and
other conditions and limitations for installation and approval of the 400W Series panel-mounted units. The
400W Series includes the GPS 400W, GNC 420W, GNC 420AW, GNS 430W, and GNS 430AW panel-
mounted units. Refer to Section 7, Limitations for additional information and other considerations.
NOTE
Except where specifically noted, references made to the GNS 430W will equally apply to the GNS
430AW. Also, except where specifically noted, references made to the GNC 420W will apply
equally to GNC 420AW.
Table 1-1. 400W Series Units
MODEL PART NUMBER COLOR NOTES
GPS 400W 011-01057-00 BLACK
011-01057-10 GRAY
011-01057-40 BLACK NOTE 1
011-01057-50 GRAY NOTE 1
GNC 420W 011-01058-00 BLACK
011-01058-10 GRAY
011-01058-40 BLACK NOTE 1
011-01058-45 BLACK 28 VDC UPGRADE UNIT
011-01058-50 GRAY NOTE 1
GNC 420AW 011-01059-00 BLACK
011-01059-10 GRAY
011-01059-40 BLACK NOTE 1
011-01059-50 GRAY NOTE 1
GNS 430W 011-01060-00 BLACK
011-01060-10 GRAY
011-01060-40 BLACK NOTE 1
011-01060-45 BLACK 28 VDC UPGRADE UNIT
011-01060-50 GRAY NOTE 1
GNS 430AW 011-01061-00 BLACK
011-01061-10 GRAY
011-01061-40 BLACK NOTE 1
011-01061-50 GRAY NOTE 1
Designations: A = 28 VDC Unit with 16w COM transmitter
Note 1: The unit is an upgrade of the non-WAAS unit.

Page 1-2 400W Series Installation Manual
Rev. A 190-00356-02
1.2 Scope
The installation instructions and other data contained within this manual are FAA approved under
400W/500W Series AML STC SA01933LA, which is applicable for implementation within airplanes
that are type certificated only under Civil Air Regulation 3 (CAR 3) or 14 Code of Federal Regulations
(CFR) Part 23. Only the equipment and systems interfaces described in this manual have been
determined to be mutually compatible and are operationally suitable and approved for use as
characterized herein, or within the FAA approved airplane flight manual supplement (AFMS) reflecting
software Version 2.00 and later. Some differences in operation may be observed when comparing the
information in this manual and the FAA approved AFMS to later FAA approved software versions. Such
differences will be identified in revised editions of the FAA approved AFMS characterizing later
software versions, and any applicable limitations and normal or abnormal operating conditions.
It is possible for installers and other appropriately certificated persons to seek FAA approval for
installation and operational use of the 400W Series equipment with systems not identified in this manual,
such as for aircraft certificated under 14 CFR Parts 25, 27, or 29, by means of a field approval, STC or
TC. Refer to FAA Advisory Circular (AC) 20-138A and other applicable guidance when applying for
installation and operational approval. AC 21-40 provides guidance for the STC approval process and AC
43-210 provides guidance for the field approval process. If the field approval process is used, it is
advisable to consider the conditions and stipulations in FAA Flight Standards Flight Standards
Information Bulletin for Airworthiness (FSAW), 94-32, “Guidance for Performing Field Approvals of
Installation and Operational Use of Global Positioning Systems (GPS) or GPS with Wide Area
Augmentation Systems (GPS-WAAS), Referred to as Global Navigation Satellite Systems (GNSS)
Equipment”, as revised.
Regardless of applicability of the AML STC or alternative field approval application for installation and
operational approval, prior to completing the installation and before returning the airplane to service, the
installer or other appropriately certificated person is required to complete and submit an FAA Form 337
(OMB No. 2120-0020), “Major Repair and Alteration Airframe, Powerplant, Propeller, or Appliance” to
their local FAA Flight Standards District Office describing the work accomplished. The FAA Form 337
must detail the equipment and systems to which the respective GPS 400W, GNC 420W, GNC 420AW,
GNS 430W, or GNS 430AW is interfaced and reflect appropriately approved or acceptable data for
which follow-on FAA field approval is being sought. See AC 43.9-1E for instructions for completing the
FAA Form 337.
1.3 Equipment Description
The 400W Series units are 6.25 inches wide 2.66 inches high. The display is a 240 by 128 pixel color
LCD. The units include two removable data cards, one with a Jeppesen database (to be inserted in the left
card slot), and the second being a terrain database (to be inserted in the right card slot).
The GPS 400W is a WAAS/GPS unit that meets the requirements of Technical Standard Order (TSO)-
C146a (specified in Table 1-4) and may be approved for IFR en route, terminal, non-precision, and
precision approach operations when installed in reference to the instructions in this manual as referenced
in AML STC SA01933LA.
The GNC 420W/(AW) includes all the features of the GPS 400W, and also includes VHF
communications transceiver. The “AW” model is a 28 VDC unit with a 16 Watt COM transmitter. The
GNC 420W/(AW) meets the requirements of TSOs specified in Table 1-4.
The GNS 430W/(AW) includes all the features of the GNC 420W/(AW), and also includes airborne
VOR/localizer (LOC) and glideslope (G/S) receivers. The “AW” model is a 28 VDC unit with a 16 Watt
COM transmitter. The GNS 430W/(AW) meets the requirements of TSOs specified in Table 1-4.

400W Series Installation Manual Page 1-3
190-00356-02 Rev. A
CAUTION
The GPS 400W Series product lens is coated with a special anti-reflective coating which
is very sensitive to skin oils, waxes and abrasive cleaners. CLEANERS CONTAINING
AMMONIA WILL HARM THE ANTI-REFLECTIVE COATING. It is very important to
clean the lens using a clean, lint-free cloth and an eyeglass lens cleaner that is specified as
safe for anti-reflective coatings.
CAUTION
The use of ground-based cellular telephones while aircraft are airborne is prohibited by
FCC rules. Due to potential interference with onboard systems, the use of ground-based
cell phones while the aircraft is on the ground is subject to FAA regulation 14 CFR §91.21.
FCC regulation 47 CFR §22.925 prohibits airborne operation of ground-based cellular
telephones installed in or carried aboard aircraft. Ground-based cellular telephones must
not be operated while aircraft are off the ground. When any aircraft leaves the ground, all
ground-based cellular telephones on board that aircraft must be turned off. Ground-based
cell phones that are on, even in a monitoring state, can disrupt GPS performance.
1.4 Technical Specifications
1.4.1 Physical Characteristics
Bezel Height
2.66 in. (67 mm)
Bezel Width
6.25 in. (159 mm)
Rack Height (Dimple-to-dimple)
2.69 in. (68 mm)
Rack Width
6.32 in. (160 mm)
Depth Behind Panel with Connectors (Measured from face of
aircraft panel to rear of connector backshells)
11.00 in. (279 mm)
GPS 400W Weight (Unit only)
4.0 lbs. (1.82 kg)
GPS 400W Weight (Installed with rack and back plate)
5.0 lbs. (2.27 kg)
GNC 420W/AW Weight (Unit only)
4.5 lbs. (2.04 kg)
GNC 420W/AW Weight (Installed with rack and back plate)
5.5 lbs. (2.49 kg)
GNS 430W/AW Weight (Unit only)
5.1 lbs. (2.31 kg)
GNS 430W/AW Weight (Installed with rack and back plate)
6.2 lbs. (2.81 kg)

Page 1-4 400W Series Installation Manual
Rev. A 190-00356-02
1.4.2 General Specifications
Operating Temperature Range
-20 ° C to +55 ° C. For more details see Environmental
Qualification Form on the Dealers Only page on
www.garmin.com. See Appendix A for part numbers.
Humidity
95% non-condensing
Altitude Range
-1,500 ft to 50,000 ft
Input Power Requirements
Input Voltage Range - All Units (Main
Connector)
10 to 33.2 VDC
Input Voltage Range GNC 420W, GNS
430W (COM Connector)
11 to 33 VDC
Input Voltage Range GNC 420AW, GNS
430AW (COM Connector)
24.1 to 33 VDC
GPS 400W (Main Connector)
700 mA @ 28 VDC (maximum)
1.4 A @ 14 VDC (maximum)
GNC 420W, GNC 420AW, (Main Connector
)
1.2 A @ 28 VDC (maximum)
2.5 A @ 14 VDC (maximum)
GNS 430W, GNS 430AW, (Main Connector)
1.2 A @ 28 VDC (maximum)
2.5 A @ 14 VDC (maximum)
GNC 420W, GNS 430W (COM Connector)
15 mA @ 28 VDC (receive)
3.0 A @ 28 VDC (transmit)
15 mA @ 14 VDC (receive)
6.0 A @ 14 VDC (transmit)
GNC 420AW, GNS 430AW (COM
Connector)
15 mA @ 28 VDC (receive)
3.0 A @ 28 VDC (transmit)
Superflag Power Requirements
500 mA maximum per superflag output
Environmental Testing
See Environmental Qualification Form on the Dealers
Only page on www.garmin.com. See Appendix A for
part numbers.
The display on the 400W Series unit is a sunlight readable LCD display.
Display Size
3.8” diagonal
Active Area
3.29” (W) x 1.75” (H)
Resolution
240 x 128 pixels
Viewing Angle
(with a 2:1 contrast ratio, min)
Left/Right:
Up:
Down:
40
°
40
°
40
°
Viewing Distance
36 inches maximum

400W Series Installation Manual Page 1-5
190-00356-02 Rev. A
1.4.3 GPS Specifications
Number Of Channels
15 (12 GPS and 3 GPS/WAAS/SBAS)
Frequency
1575.42 MHz L1, C/A code
-116 dBm to -134.5 dBm GPS
Sensitivity (Acquisition, No
Interference)
-116 dBm to -134.5 dBm WAAS
Sensitivity (Drop Lock)
-144 dBm
Dynamic Range
> 20 dB
Lat/Lon Position Accuracy
<1.25 meter RMS horizontal, <2 meter vertical, with WAAS
Velocity
1000 knots maximum (above 60,000 ft)
TTFF (Time To First Fix)
1:45 min. typical with current almanac, position, and time
Reacquisition
10 seconds typical
Position Update Interval
0.2 sec (5 Hz)
1 PPS (Pulse Per Second)
±
275 Nsec of UTC second
Datum
WGS-84
SATCOM Compatibility
Compatible on aircraft equipped with SATCOM, when
installed with A33 or A34 antennas.
Antenna Power Supply
35 mA typical, 40 mA max at 4.7 VDC

Page 1-6 400W Series Installation Manual
Rev. A 190-00356-02
1.4.4 COM Transceiver Specifications (GNC 420W and GNS 430W Only) **
Audio Output
100 mW minimum into a 500 Ω load.
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz.
Audio Distortion
The distortion in the receiver audio output shall not exceed
15% at all levels up to 100 mW.
AGC Characteristics
The audio output will not vary by more than 6 dB when the leve
l
of the RF input signal, modulated 30% at 1000 Hz, is varied
from 5
µ V to 450,000 µ V.
Sensitivity
(S+N)/N on all channels shall be greater than 6 dB when the
RF level is 2
µ V (hard) modulated 30% at 1000 Hz at rated
audio.
Squelch
2 µ v ± 6 dB for 25 kHz channels.
3
µ v ± 6 dB for 8.33 kHz channels.
Selectivity
6 dB BW is greater than ± 8 kHz for 25 kHz channeling.
60 dB BW is less than ±25 kHz for 25 kHz channeling.
6 dB BW is greater than ±2.778 kHz for 8.33 kHz channeling.
60 dB BW is less than ±7.37 kHz for 8.33 kHz channeling.
Spurious Response
Greater than 85 dB.
Transmitter Power
At Least 10 watts, 16 watts for “AW” models
Transmitter Duty Cycle
Recommended 10% maximum.
Modulation Capability
The modulation is not less than 70% and not greater than 98%
with a standard modulator signal applied to the transmitter.
Carrier Noise Level
At least 45 dB (S+N)/N.
Frequency Stability
0.0005%
Demodulated Audio Distortion
Less than 10% distortion when the transmitter is modulated at
least 70%.
Sidetone
1.4 VRMS into a 500 Ω load when the transmitter is modulated
at least 70%.
Demodulated Audio Response
Less than 6 dB when the audio input frequency is varied from
350 to 2500 Hz.
* C37d Class 4 & 6 may not provide suitable COM transmit range for some high-altitude aircraft.
**Specifications shown apply at nominal input voltages of 13.75 VDC or 27.5 VDC, as applicable, and
with a nominal 50 ohm resistive load at the antenna connector.

400W Series Installation Manual Page 1-7
190-00356-02 Rev. A
1.4.5 VOR Specifications (GNS 430W Only)
Receiver Audio Sensitivity
At -103.5 dBm (S+N)/N shall not be less than 6 dB.
Course Deviation Sensitivity
-103.5 dBm or less for 60% of standard deflection.
Flag
The VOR Course Deviation Flag must be flagged:
a)
in the absence of an RF signal.
b)
in the absence of the 9960 Hz modulation.
c)
in the absence of either one of the two 30 Hz modulations.
d)
When the level of a standard VOR deviation test signal
produces less than a 50% of standard deflection.
AGC Characteristics
From -99 dBm to -13 dBm input of a Standard VOR Audio Test
Signal, audio output levels shall not vary more than 3 dB.
Spurious Response
Greater than 80 dB.
VOR OBS Bearing Accuracy
The bearing information as presented to the pilot does not hav
e
an error in excess of 2.7° as specified by RTCA DO-196 and
EuroCAE ED-22B.
Audio Output
A minimum 100 mW into a 500 Ω load.
Audio Response
Less than 6 dB of variation between 350 and 2500 Hz. Except
the 1020 Hz Ident Tone is at least 20 dB down in voice mode.
Audio Distortion
The distortion in the receiver audio output does not exceed
10% at all levels up to 100 mW.

Page 1-8 400W Series Installation Manual
Rev. A 190-00356-02
1.4.6 LOC Specifications (GNS 430W Only)
Receiver Audio Sensitivity
At -103.5 dBm (S+N)/N shall not be less than 6 dB.
Course Deviation Sensitivity
-103.5 dBm or less for 60% of standard deflection.
Flag
The LOC Course Deviation Flag must be flagged:
a)
in the absence of an RF signal.
b)
When either the 90 or 150 Hz modulating signals is
removed and the other is maintained at its normal 20%.
c)
In the absence of both 90 and 150 Hz modulation.
d)
When the level of a standard localizer deviation test signal
produces less than a 50% of standard deflection.
AGC Characteristics
From -86 dBm and -33 dBm input of a Standard VOR Audio
Test Signal, audio output levels does not vary more than 3 dB.
Selectivity
Nose Bandwidth: The input signal level required to produce the
reference AGC voltage does not vary more than 6 dB over the
input signal frequency range of ± 9 kHz from the assigned
channel frequency.
Skirt Bandwidth: The input signal level required to produce
reference AGC voltage will be at least 70 dB greater than the
level required to produce reference AGC voltage at the
assigned channel frequency at ± 36 kHz from the assigned
channel frequency.
Spurious Response
Greater than 80 dB.
Centering Accuracy
Typical 0 ± 3 mV (Max error 9.9 mV per RTCA DO-195).
Audio Output
A minimum 100 mW into a 500 Ω load.
Audio Response
Less than 6 dB of Variation between 350 and 2500 Hz. Except
the 1020 Hz Ident Tone is at least 20 dB down in voice mode.
Audio Distortion
The distortion in the receiver audio output does not exceed
10% at all levels up to 100 mW.