GDL 90 UAT Datalink Sensor System Helicopter Installation...

GDL 90 UAT Datalink Sensor System

Helicopter Installation Supplement September 2007 561-0290-00 Rev C

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GDL 90 Helicopter Installation Supplement 560-0290-00 Rev. C i

HISTORY OF REVISIONS

Part No. Revision Date Description 561-0290-00 A 08 Feb 2006 Initial Release. 561-0290-00 B 19 May 2006 Update for STC issue (1.1). Add: details from HP drawings

previously referenced (3.4, 3.4.1), test loads for alternate locations (3.4.1), A/G switch & bracket data (3.4.2), GA 56W, GA 56A, GA 57 GPS antennas (page iii, 1.3.1, Table 3-1, 3.5.1, 3.7). Clarify notification (ii), original battery location (3.4.1), circuit breaker reference (3.4.3, Table 3-2 note), weight & balance guidelines (3.7). Specify FADEC requirements (3.2, 3.5.2, 3.9).

561-0290-00 C 18 Sep 2007 Update for installation variations: Add forward upper UAT antenna location, correct swapped WL stations, allow range of locations for lower UAT antenna (Table 3-5, 3.5.2, Fig 3-10 caption, add Fig. 3-11 & Fig. 3-12, Table 3-8). Correct top view (Fig 3-1). Clarify triangle 1 callouts (Fig. 3-3). Item 1 applies to both Fig. 3-2 and 3-3 (3.4.1). Add GPS antenna location guidance (add Figure 3-7), move from centerline (Table 3-4). Reference other approved GPS antennas (Table 3-1 note, 3.5.1); add GA 35, 36, 37 GPS antennas (pg. iii, 1.3.1, Table 3-1, 3.5.1, Table 3-7). Add ground plane guidance (3.5.2). Add 190-00569-00 manual for optional GPS antenna install in structural skin (pg. iii, 1.3.1, 3.5.1). Extensive formatting changes to improve readability of manual.

ORDERING INFORMATION To receive additional copies of GDL 90 publications, order the following part numbers: GDL 90 System Rotorcraft STC Master Data List* 560-0254-xx GDL 90 Installation Manual* 560-1049-xx GDL 90 Helicopter Installation Supplement* 561-0290-xx GA 56W Antenna Installation Manual* 190-00483-01 A-33 GPS Antenna Installation Guide* 560-0949-xx A-41 UAT Antenna Installation Guide* 560-0215-xx A-40 UAT Antenna Installation Guide* 560-0253-xx A-34 and GA 35 GPS Antenna Installation Guide* 560-5047-xx GA 35, GA 36, GA 37 Antenna Installation Instructions* 190-00848-00 GA Antenna Series Installation Manual* 190-00569-00

For installations including the optional GSL 71 UAT Control Panel: GSL 71 Installation Manual* 560-0411-xx GSL 71 Pilot Guide* 560-0411-xx GSL 71 RFM Supplement* 560-0412-xx GSL 71 Helicopter Installation Supplement* 560-1059-xx

*These documents, and others relating to GDL 90 or GSL 71 installation, STC certification, and continued airworthiness/maintenance, are included in electronic form in the GDL 90 UAT Sensor Product CD, part number 140-0063-xxx.

ii 560-0290-00 Rev. C GDL 90 Helicopter Install Supplement

List of Effective Pages

Page Rev Page Rev Page Rev Page Rev Page RevCover C Copyright C i C ii C iii C iv C v C vi C 1-1 C 1-2 C 2-1 C 2-2 C 3-1 C 3-2 C 3-3 C 3-4 C 3-5 C 3-6 C 3-7 C 3-8 C 3-9 C 3-10 C 3-11 C 3-12 C 3-13 C 3-14 C 3-15 C 3-16 C 3-17 C 3-18 C 3-19 C 3-20 C 3-21 C 3-22 C 4-1 C 4-2 C

Table of Contents

GDL 90 Helicopter Installation Supplement 560-0290-00 Rev. C iii

TABLE OF CONTENTS 1. INTRODUCTION ....................................................................................... 1-1 1.1 PURPOSE..........................................................................................................................................1-1 1.2 SCOPE ..............................................................................................................................................1-1 1.3 RELATED DOCUMENTS....................................................................................................................1-1

1.3.1 GARMIN AT, INC......................................................................................................................1-1 1.3.2 FEDERAL AVIATION ADMINISTRATION (FAA) ........................................................................1-1

2. SYSTEM DESCRIPTION.......................................................................... 2-1

3. HELICOPTER INSTALLATION............................................................. 3-1 3.1 PRE-INSTALLATION INFORMATION .................................................................................................3-1 3.2 INSTALLATION OVERVIEW..............................................................................................................3-1 3.3 GDL 90 SYSTEM .............................................................................................................................3-1 3.4 GDL 90 INSTALLATION...................................................................................................................3-1

3.4.1 GDL 90 MOUNTING .................................................................................................................3-3 3.4.2 AIR/GROUND STATUS ..............................................................................................................3-5 3.4.3 GDL 90 ELECTRICAL ...............................................................................................................3-7

3.5 ANTENNA INSTALLATION................................................................................................................3-8 3.5.1 GPS ANTENNA.........................................................................................................................3-8 3.5.2 UAT ANTENNAS ....................................................................................................................3-11

3.6 PLACARDS .....................................................................................................................................3-19 3.7 WEIGHT AND BALANCE ................................................................................................................3-19 3.8 GDL 90 SYSTEM CONFIGURATION ...............................................................................................3-20 3.9 POST INSTALLATION CHECKOUT ..................................................................................................3-20 3.10 INSTALLATION COMPLETION.....................................................................................................3-20

4. AML ROTORCRAFT INSTALLATION & MAINTENANCE ............ 4-1

Table of Contents

iv 560-0290-00 Rev. C GDL 90 Helicopter Install Supplement

LIST OF TABLES Table 3-1. System Equipment List ............................................................................................................3-2 Table 3-2. Rotorcraft Static Test Loads ....................................................................................................3-3 Table 3-3. Circuit Breaker Size and Placard .............................................................................................3-8 Table 3-4. GPS Antenna Locations...........................................................................................................3-9 Table 3-5. UAT Antenna Locations........................................................................................................3-12 Table 3-6. Unit Weights..........................................................................................................................3-19 Table 3-7. Antenna Weights ...................................................................................................................3-19 Table 3-8. Unit Center of Gravity ...........................................................................................................3-19 LIST OF ILLUSTRATIONS Figure 2-1. Sample GDL 90 System .........................................................................................................2-1 Figure 2-2. GSL 71 Front Panel ................................................................................................................2-2 Figure 3-1. AS-350 General Layout..........................................................................................................3-3 Figure 3-2. GDL 90 Mounting (AS-350 Series) .......................................................................................3-4 Figure 3-3. GDL 90 Mount Shelf (AS-350 Series) ...................................................................................3-4 Figure 3-4. Air-Ground Switch Installation (existing bracket) .................................................................3-6 Figure 3-5. Air-Ground Switch Bracket....................................................................................................3-6 Figure 3-6. Air-Ground Switch Bracket (with switch)..............................................................................3-7 Figure 3-7. Typical Rotorcraft GPS Antenna Locations...........................................................................3-9 Figure 3-8. Typical Rotorcraft GPS Antenna Locations...........................................................................3-9 Figure 3-9. Sample GPS Antenna Installation (view looking down)......................................................3-10 Figure 3-10. Sample GPS Antenna Installation (view looking up).........................................................3-10 Figure 3-11. GPS Antenna Backing Plate...............................................................................................3-11 Figure 3-12. Aft upper UAT Antenna Installation (view looking down) ...............................................3-13 Figure 3-13. Forward upper UAT Antenna Installation (view from right side)......................................3-13 Figure 3-14. Sample lower UAT Antenna Installation (view from left side) .........................................3-13 Figure 3-15. UAT Antenna Doubler (for composite structure, upper aft location) ................................3-14 Figure 3-16. UAT Antenna Backing Plate (for aluminum structure, forward upper or lower)...............3-15 Figure 3-17. Sample upper UAT Antenna Installation (view looking down).........................................3-16 Figure 3-18. UAT Antenna Doubler (upper) ..........................................................................................3-17 Figure 3-19. UAT Antenna Doubler (lower) ..........................................................................................3-18

Introduction

GDL 90 Helicopter Installation Supplement 560-0290-00 Rev. C 1-1

1. INTRODUCTION 1.1 Purpose The purpose of this document is to supplement the installation of the Garmin GDL 90 for rotorcraft installations. This document references other FAA approved installation guidance which is required for complete system installation. The installer should always reference the current FAA approved MDL (Master Data List), 560-0254-xx.

STC SR01863LA authorizes the installation of the GDL 90 for a variety of rotorcraft.

1.2 Scope This document applies to the installation of the Garmin GDL 90 in rotorcraft. It includes general details to allow the use of this data along with FAA acceptable methods, techniques, and practices as outlined in AC 43.13-1B and 43.13-2A to install the equipment in each helicopter as specified under the FAA Approved Model List. This installation supplement does not repeat information contained in other referenced documents contained in the MDL or other FAA issued installation guidance.

1.3 Related Documents The following documents list information relating to the installation.

1.3.1 Garmin AT, Inc.

• 560-0254-xx GDL 90 Rotorcraft STC Master Data List • 560-1049-xx, GDL 90 Installation Manual • 560-1059-xx, GSL 71 Helicopter Installation Supplement • 190-00483-01, GA 56W Antenna Installation Manual • 190-00522-01, GA 55A GA 56A GA 57 Antenna Installation Manual • 190-00569-00, GA Antenna Series Installation Manual • 190-00848-00, GA 35, GA 36, GA 37 Antenna Installation Instructions • 560-0949-xx, A-33 GPS Antenna Installation Guide • 560-0215-xx, A-41 UAT Antenna Installation Guide • 560-0253-xx, A-40 UAT Antenna Installation Guide • 560-5047-xx, A-34 & GA 35 GPS Antenna Installation Guide

1.3.2 Federal Aviation Administration (FAA)

• FAA AC 43.13-1B, Acceptable Methods, Techniques, and Practices - Aircraft Inspection and Repair • FAA AC 42.13-2A, Acceptable Methods, Techniques, and Practices - Aircraft Alterations

Introduction

GDL 90 Helicopter Install Supplement 560-0290-00 Rev. C 1-2

NOTES

System Description


2. SYSTEM DESCRIPTION Installation of the Garmin GDL 90 Data Link Sensor with UAT antenna(s), GPS/WAAS antenna, and other system interfaces. The GDL 90 can interface to the pilot through optional existing equipment, such as the Garmin MX20 Multi-Function Display. Altitude data can be provided directly to the GDL 90 as shown in Figure, or through other compatible interfaced equipment, such as the MX20.

Figure 2-1. Sample GDL 90 System

System Description


The GDL 90 UAT may also interface to the pilot through the optional GSL 71 UAT Control Panel, which may be installed under this STC. The GSL 71 is certified under TSO C154. The GSL 71 can control the GDL 90 and provide the operational status of the GDL 90. The GSL 71 can provide data to the GDL 90 for transmission via the UAT datalink. This data may include a Flight ID code, or other Rotorcraft status information including ADS-B position data. Installation instructions for the GSL 71 in rotorcraft are included in the 560-1059-xx GSL 71 Helicopter Installation Supplement.

Squawk

CodeAlt it udeDisplay

Small, InnerKnob

Large, Out erKnob

UAT St at us

Alt it ude HoldAlert er

EmergencyFlight ID

VFRSelect

Mode Select

St andby On Alt it udeOn

Ident

Power

Figure 2-2. GSL 71 Front Panel

Helicopter Installation


3. HELICOPTER INSTALLATION 3.1 Pre-Installation Information Always follow good avionics installation practices per FAA Advisory Circulars (AC) 43.13-1B, 43.13-2A, or later FAA approved revisions of these documents. As always, perform the various post installation checkouts before closing the work area in case problems occur.

Before starting the installation, review the Master Data List referenced on the STC to ensure you have all installation instructions and guidance. Read each section in its entirety before beginning the procedure. Prior to installation, consider the structural integrity of the GDL 90 installation as defined in AC 43.13-2A, Chapter 1. Refer to Weights and Balance, Section 3.7, for computation values.

Complete an electrical load analysis in accordance with AC 43.13-1B, Chapter 11, on the rotorcraft prior to starting modification to ensure the rotorcraft has the ability to carry the required load. Refer to Section 3.7. Document the results of the electrical load analysis as required.

3.2 Installation Overview A successful installation should start with careful planning including determination of mounting locations, antenna mounting, cable routing, and other required modifications. Once the mounting location has been determined, prepare the mounting frame for installation. It may be easier to complete the wiring harness and attach the connectors to the connector mounting bracket before attaching it to the mounting frame.

Rotorcraft with Full Authority Digital Engine Control (FADEC) must locate UAT antennas over 0.5 meters from the FADEC.

Carefully plan which external devices will be connected to the GDL 90 inputs.

3.3 GDL 90 System The GDL 90 System components for this installation are listed in Table 3-1.

Connections are made to the following existing rotorcraft equipment:

• Power Bus

• Serial Data Interfaces (to previously-installed or concurrently-installed equipment)

• Air/Ground Status Switch

• Audio Panel or Speaker (optional)

Details on the optional interfaces are included in the GDL 90 installation manual.

3.4 GDL 90 Installation The installation will use the mounting frame provided and be installed in accordance with information contained in this manual and the referenced installation manuals.

The general installation practices used for this installation are listed in the GDL 90 Helicopter STC Master Data List, 560-0254-xx.



Table 3-1. System Equipment List

Description Model No. Mfg. P/N Mfg. Comment Item# Data Link Sensor GDL 90 430-6081-1xx-xxx Garmin AT 1 UAT Control Panel GSL 71 430-6090-6xx Garmin AT Optional 2

Micro APM 430-6200-xxx Garmin AT 1

UAT Antenna A-41 590-0051 AT-130-2

Garmin AT AeroAntenna

Optional antenna 5, 6

OR

UAT Antenna A-40 590-0052 CI 105-11

Garmin AT Comant

Standard antenna

GPS Antenna A-33 590-1104 AT-575-9


Optional antenna 7, 8

GPS Antenna A-34 590-1112 AT-575-93


Optional teardrop footprint

GPS Antenna GA 35 013-00235-00 Garmin

Standard teardrop footprint


Optional ARINC footprint


Optional GPS + XM

GPS Antenna GA 56W 011-01111-xx Garmin Optional teardrop antenna

GPS Antenna GA 56A 011-01154-xx Garmin Optional ARINC footprint

OR

GPS Antenna GA 57 011-01032-xx Garmin Optional GPS + XM

Note: see GDL 90 Helicopter STC Master Data List, 560-0254-xx for specific approved part numbers and other approved antennas. Item numbers refer to those illustrated in Figure 3-1.



Figure 3-1. AS-350 General Layout

3.4.1 GDL 90 Mounting Most rotorcraft installation locations may be selected and tested for structural integrity using the guidance provided in P/N 560-1049-xx Section 2.5 and Appendix D, with the exception that the load factors and static test loads in Table 3-2 below must be used to replace those in P/N 560-1049-xx Appendix D Table D-1 Static Test Loads. Since the combined weight of the GDL 90 and its equipment mounting rack is 6.4 lbs, the static loads which must be applied (Load Factor x 6.4 lbs.) will be the following:

Table 3-2. Rotorcraft Static Test Loads

Direction of Force Load Factor Static Test Load (Load Factor x GDL 90 weight)

Downward 20.0 g (20.0 x 6.4) = 128 lbs Upward 4.0 g (4.0 x 6.4) = 25.6 lbs Sideward 8.0 g (8.0 x 6.4) = 51.2 lbs Rearward 1.5 g (1.5 x 6.4) = 9.6 lbs Forward 16.0 g (16.0 x 6.4) = 102 lbs

For the AS-350 series rotorcraft on the AML, the baggage compartment mounting location shown in Figure 3-2 should be used for rotorcraft where the battery has been moved from its original location as shown. For rotorcraft with the battery in the original location, the test method described above should be used. The P/N 310-0462-xx GDL 90 mount tray (item 5 in Figure 3-2) is attached to the existing bay shelf if the material thickness is 0.050 inch or more.



Figure 3-2. GDL 90 Mounting (AS-350 Series)

Figure 3-3. GDL 90 Mount Shelf (AS-350 Series)

If the existing shelf material thickness is less than 0.050 inches, use the 2024-T3 aluminum 0.050 inch thick shelf design detailed in Figure 3-3. Apply two (2) coats of Epoxy FR Primer MIL-PRF-23377G Type-1 (or



equivalent) as a protective coating to the shelf (item 1 in Figure 3-2 or 3-3). Transfer hole locations from the existing structure. Remove the paint around installation holes and alodine using ALODINE 1201 (or equivalent). Attach four (4) MS21075-L08 #8-32 anchor nuts to the shelf with eight (8) 3/32 MS20426AD3 rivets (or equivalent, see items 2 & 3 and detail A in Figure 3-3). Install one (1) MS35489-22 grommet (or equivalent, see item 4 in Figure 3-3).

If the existing bay shelf is being replaced, install the new shelf using four (4) AN3-3A 10-32 bolts, eight (8) NAS1149D 0332J 10-32 washers, and four(4) NAS 21045-3 10-32 nuts (or equivalent, see items 2, 3, & 4 in Figure 3-2).

Install the mounting tray to the shelf as shown in Figure 3-2. The mount tray is attached to the shelf with four (4) MS35206 or AN526 (or equivalent) 8-32 machine screws and NAS11490D N816J #8 washers (or equivalent, see items 11 & 12 in Figure 3-2).

Install the cable assemblies to the mounting tray backplate. On the rear side of the shelf install tie mount MB-41 (or equivalent, see item 8 in Figure 3-2) to prevent coax cable chafing. Attach the 350A21-1326-00 cover retention bracket (item 10), then the maintenance port connector (Garmin AT P/N 162-1574, see item 9) to the shelf using two (2) MS35206-215 4-40 screws (or equivalent, see item 7).

For other mount locations, for rotorcraft where the original shelf or it’s connecting structure has been previously removed (such as when the baggage compartment has been enlarged by the operator), or for other rotorcraft models, the approach defined in the GDL 90 Installation Manual, 560-1049-xx, Appendix D may be used to construct and validate the structural design. The load factors and static loads listed in Table 3-2 must be used instead of those in 560-1049-xx, Appendix D.

3.4.2 Air/Ground Status For rotorcraft installations, the GDL 90 Air/Ground Discrete Input (see P/N 560-1049-xx Sections 2.7.1.2 and 2.8.5.1) must be connected to a source of rotorcraft air/ground status. If the rotorcraft is equipped with a compatible air/ground signal source, this should be used. The GDL 90 input is active low (i.e. grounded when active, and open otherwise), and presents a load of greater than 100kΩ. The GDL 90 air/ground input can be configured using the APM for either ground-active or open-active polarity.

AS-350 series rotorcraft without a previously approved air/ground status source must install the Eurocopter P/N V3-1 Microswitch (or equivalent) to provide the required signal to the GDL 90. This switch is mechanically actuated by the rotorcraft collective using a Eurocopter P/N JV-20 Actuator Arm (or equivalent) as illustrated in Figure 3-4. The Honeywell V7-2A17D8-207 or equivalent set may be used as an alternative to the V3-1 Microswitch and JV-20 Actuator Arm. Figure 3-4 shows the V3-1 Microswitch added to a previously installed bracket with another collective-actuated switch.

For rotorcraft without an existing mount bracket for the switch, one may be constructed from 0.040 inch 2024-T3 aluminum as defined in Figure 3-5 and Figure 3-6. Apply two (2) coats of Epoxy FR Primer MIL-PRF-23377G Type-1 (or equivalent) as a protective coating. Attach the bracket to the rotorcraft with two (2) MS35206-217 screws, and two (2) MS20365-44A nuts. Use two (2) MS35206-217 screws, two (2) MS21042-L4 nuts, and two (2) AN960JD4L washers to mount the switch to the bracket.



Figure 3-4. Air-Ground Switch Installation (existing bracket)

R0.125

R1.0001.875

27°

36°

45°

R0.250

NOTE:

MATERIAL: .040" THK. 2024-T3 ALUM.

0.312

0.688

0.125

1.625

0.625

0.313

3X Ø0.125

0.2500.250

1.250

1.062

1.477

Figure 3-5. Air-Ground Switch Bracket



Figure 3-6. Air-Ground Switch Bracket (with switch)

3.4.3 GDL 90 Electrical Every installation will present a unique situation for that particular rotorcraft. In all cases the installer is responsible to follow the acceptable methods, techniques, and practices as defined in AC 43.13-1B, Chapter 11.

The Garmin installation kits include connectors and crimp contacts. The crimp contacts are specified for 20 to 24 AWG wire as required by the GDL 90 Installation Manual P/N 560-1049-xx, Sections 2.5.1, 2.7, and Appendix C. Sample wiring diagrams for the GDL 90 installation are included in the GDL 90 Installation Manual P/N 560-1049-xx (see Appendix C).

Attention should be given to minimize ground leads from the shield of twisted wires. After installing the pins, strain relief all wires as appropriate, following guidance in the GDL 90 Installation Manual.

The GDL 90 is powered via a separate circuit breaker as required by the GDL 90 Installation Manual, 560-1049-xx Appendix C Figure C-1. Circuits should be protected in accordance with the approved data in this document (see Table 3-3. Circuit Breaker Size and Placard) and the guidelines in AC 43.13-1B, chapter 11, section 4. For rotorcraft with multiple power busses, this circuit breaker is sourced from the non-essential bus.



Table 3-3. Circuit Breaker Size and Placard

Unit Placard 14 VDC Breaker Size

28 VDC Breaker Size

GDL 90 UAT 3 A 2 A

An electrical load analysis should be completed on each rotorcraft prior to installation, following guidance in the GDL 90 Installation Manual.

3.5 Antenna installation Install the antennas for the GDL 90 as defined in the GDL 90 Installation Manual, 560-1049-xx, Section 2.6 and the antenna manufacturer’s installation manuals required by the Master Data List, 560-0254-xx.

3.5.1 GPS Antenna When installing a GPS antenna on a helicopter, a suitable location should be found for optimum performance. GDL 90 Install Manual 560-1049-02 Section 2.6.1 includes GPS antenna location guidelines. Figure 3-7 and Figure 3-8 represent the best locations for most rotorcraft installations. If the installation area chosen for a particular installation requires mounting on a structural skin, reference Garmin document 190-00569-xx, GA Antenna Series Installation Manual, for doubler information. Nonstructural installations may use a simple backing plate as shown in Figure 3-11.

The backing plate defined in Figure 3-11 must be used for A-33 GPS antenna installation in the locations identified in Table 3-4 and illustrated in Figure 3-9. Additional structural approval may be required for alternate locations. (Note: Only one GPS antenna is required for GDL 90 installation under this STC, and the second location listed in Table 3-4 may be used for installation of an antenna to support another product like the Garmin Model GNS 480 GPS/Nav/Com.) The backing plate is manufactured from 0.040 inch thick 2024-T3 aluminum. Apply two (2) coats of Epoxy FR Primer MIL-PRF-23377G Type 1 or equivalent to the backing plate before assembly.

Eight (8) MS20426AD3 rivets are used to attach four (4) MS21069 L06 Anchor Nuts to the backing plate as shown in Figure 3-11.

A backing plate of similar design, but with the appropriate footprint and hole pattern, should be used in the locations identified in Table 3-4 for the GA 35, GA 36, GA 37, GA 56W, GA 56A, GA 57, A-34, or other approved GPS antenna (as identified in the GDL 90 Installation Manual, 560-1049-xx.



PRIMARY LOCATION

ALTERNATE LOCATION

Figure 3-7. Typical Rotorcraft GPS Antenna Locations

PREFERRED LOCATION

Figure 3-8. Typical Rotorcraft GPS Antenna Locations

Table 3-4. GPS Antenna Locations

Rotorcraft Series Station BL. WL. AS-350 58.0 RBL 1.0 47.8 AS-350 64.0 LBL 1.0 47.8

Note: Garmin recommends 6 inches edge-to-edge minimum separation (9 inch center-to-center) between GPS antennas to minimize antenna pattern distortion and blockage of low elevation satellites.



A-33 GPS Antenna P/N 590-1104 Sealant

Figure 3-9. Sample GPS Antenna Installation (view looking down)

Backing plates per Figure 3-11

Figure 3-10. Sample GPS Antenna Installation (view looking up)

The antenna coax may be routed through the existing hole pictured in Figure 3-10, if an MS35489-22 grommet (or equivalent) is installed for coax cable protection.

Coax and Grommet



Figure 3-11. GPS Antenna Backing Plate

3.5.2 UAT Antennas One upper antenna and one lower antenna should be installed. Rotorcraft with FADEC must locate UAT antennas over 0.5 meters from the FADEC.

The doubler defined in Figure 3-15 and/or and backing plate defined in Figure 3-16 are required for A-41 UAT antenna installations in the locations identified in Table 3-5 and illustrated in Figure 3-1. Additional structural approval may be required for alternate locations.

UAT antenna performance is improved by having an appropriate ground plane. The ground plane should be 8" in diameter or greater, or at least 2" beyond the outer edges of the antenna base. If the doubler or backing plate is also being used as the ground plane (i.e. installed on non-conductive composite or fiberglass structure), larger dimensions (length and/or width) than those shown in Figure 3-15 and Figure 3-16 will improve performance. A half-inch ground strap should be attached to such ground planes at one end and to an appropriate ground at the other.

Doublers or backing plates of similar design, but with the appropriate footprint and hole pattern, should be used for the A-40 UAT antenna (or other antenna meeting the specifications listed in the GDL 90 Installation Manual P/N 560-1049-xx Section 1.3.7.4).



Table 3-5. UAT Antenna Locations

Rotorcraft Series Station BL. WL. AS-350 184.0 0.0 35.8 AS-350 121.0 RBL 7.0 35.8 AS-350 74.0 to 101.0 0.0 114.5

Figure 3-1 and Figure 3-12 show the aft upper antenna location (Station 184.0). When using this location, ensure the TNC antenna connector does not interfere with the engine peripherals. The alternate forward upper location (Station 121.0) is shown in Figure 3-13. The lower UAT antenna should be located as indicated in Table 3-5 and illustrated in Figure 3-14.

The aft upper antenna doubler (Figure 3-15) is manufactured from 0.050 inch thick 2024-T3 aluminum, and the forward upper & lower antenna backing plate (Figure 3-16) is manufactured from 0.040 inch 2024-T3 aluminum. Apply two (2) coats of Epoxy FR Primer MIL-PRF-23377G Type 1 or equivalent to the doubler and/or backing plates before assembly.

Doubler Assembly for composite structure (aft upper location): Sixteen (16) MS20426AD3 3/32 rivets (item 3) are used to attach four (4) MS21069 L08 8-32 Anchor Nuts (item 2, detail B) and four (4) MS21069 L3 10-32 Anchor Nuts (item 4, detail A) to the doubler as shown in Figure 3-15.

Doubler and Antenna Installation for composite structure (aft upper location): First, prepare the holes for the doubler installation in the composite rotorcraft structure. Drill four (4) holes of diameter 0.168/0.175 inch, using the doubler as a template. Remove the composite honeycomb core an additional 0.250 inch from the hole edge. Fill the space where the core material was removed with Hysol p/n EA9309.3 or equivalent. Then, install the doubler using four (4) 8-32 MS35206-245 screws (or equivalent) and four (4) #8 NAS1149D N816J washers (or equivalent) as shown in Figure 3-12. Install the antenna using four (4) 10-32 MS24693-C274 screws (or equivalent) as shown in Figure 3-12. Apply sealant per MIL-A-46106 Dow Corning 732 or equivalent around the outside edge of the antenna.



Figure 3-12. Aft upper UAT Antenna Installation (view looking down)

Figure 3-13. Forward upper UAT Antenna Installation (view from right side)

Figure 3-14. Sample lower UAT Antenna Installation (view from left side)



Figure 3-15. UAT Antenna Doubler (for composite structure, upper aft location)



Figure 3-16. UAT Antenna Backing Plate (for aluminum structure, forward upper or lower)

Backing plate Assembly for aluminum structure (forward upper & lower locations): Eight (8) MS20426AD3 3/32 rivets (item 3) are used to attach four (4) MS21069 L3 10-32 Anchor Nuts (item 2, detail A) to the backing plate as shown in Figure 3-16.

Backing plate and Antenna Installation for aluminum structure (forward upper & lower locations): Drill four (4) holes of diameter 0.168/0.175 inch, using the backing plate as a template. Install backing plate and antenna using four (4) 10-32 MS24693-C274 screws (or equivalent). Apply sealant per MIL-A-46106 Dow Corning 732 or equivalent around the outside edge of the antenna.



Figure 3-17. Sample upper UAT Antenna Installation (view looking down)



Figure 3-18. UAT Antenna Doubler (upper)



Figure 3-19. UAT Antenna Doubler (lower)



3.6 Placards Placard the circuit breakers as defined in the GDL 90 Installation Manual, 560-1049-xx, Appendix C Figure C-1.

3.7 Weight and Balance Weight and balance computation is required after the installation of the GDL 90 equipment. Follow the guidelines in the airframe manufacturer’s manual. If none are available, use the guidelines established in AC 43.13-1B, Chapter 10, Section 2. Make appropriate entries in the equipment list indicating items added, removed, or relocated along with the date accomplished. Include your name and certificate number in the rotorcraft records. The following tables identify the weight and CG (in the AS-350 series) of the new equipment. Also include the weight of any doublers, backing plates, or brackets added to the rotorcraft.

Table 3-6. Unit Weights

Item Weight GDL 90 only 5.2 lbs GDL 90 mounting tray 1.0 lbs GDL 90 mounting tray with optional cover 1.2 lbs Micro APM 0.1 lbs GSL 71 only 1.67 lbs. GSL 71 mounting tray 0.97 lbs.

Table 3-7. Antenna Weights

Component Weight A-40 UAT Antenna 0.44 lb. (0.20 kg) OR A-41 UAT Antenna 0.24 lb. (0.11 kg) GA 35 0.47 lb. (0.21 kg) GA 36 0.47 lb. (0.21 kg) GA 37 0.50 lb. (0.23 kg) GA 56W & Install Kit 0.35 lb. (0.16 kg)

OR

GA 56A & Install Kit 0.50 lb. (0.23 kg) GA 57 & Install Kit 0.54 lb. (0.24 kg) A-33 0.35 lb. (0.11 kg)

A-34 0.35 lb. (0.20 kg)

Table 3-8. Unit Center of Gravity

Model Series & Mount Location TCDS Center of Gravity Station (inches) AS-350 Series

Baggage Compartment (Rack for Battery Shelf)

Upper Skin Lower Skin Upper Skin Panel or Console

H9EU 152.0 (GDL 90 & tray, MicroAPM) 64.0 (GPS antenna) 74.0 to 101.0 (UAT bottom antenna) 184.0 or 121.0 (UAT top antenna) 34.0 (optional, GSL 71 & tray)



3.8 GDL 90 System Configuration The GDL 90 installation manual defines required setup procedures that must be performed. Refer to GDL 90 Installation Manual 560-1049-xx for system configuration.

3.9 Post Installation Checkout The GDL 90 installation manual defines a set of tests to ensure the components are properly installed and operational. Refer to GDL 90 Installation Manual 560-1049-xx for Post Installation Checkout.

The FAA has determined that “the GDL 90 does not have a high potential for interference with the FADEC. Therefore, the specific FADEC EMI test is not required. Operational EMI testing will still be required.” This determination was based on installations with the UAT antennas located over 0.5 meters from the FADEC. On FADEC-equipped rotorcraft, “all installed equipment should undergo a cross-matrix operational check for EMC considerations by operating all equipment under consideration and determining if an interference hazard is created for FADEC”.

3.10 Installation Completion After ensuring that all portions of the installation are complete and successful, cover all open areas and visually check all installed items.

AML Rotorcraft Installation and Maintenance


4. AML ROTORCRAFT INSTALLATION & MAINTENANCE The rotorcraft listed in the STC AML (Approved Model List) have special installation and/or maintenance procedures as described in this section or subsequent appendices in this manual. The drawings listed in Section 3.4 cover all models listed on the STC for the GDL 90 and associated antennas. For supplemental rotorcraft GSL 71 installation data, see the GSL 71 Helicopter Installation Supplement P/N 560-1059-xx.

AML Rotorcraft Installation and Maintenance


NOTES

GDL 90 UAT Datalink Sensor System Helicopter Installation...

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