DAC GDC31 User Manual

Equipment Installation Manual,
GDC31 Roll Steering Converter
EQUIPMENT INSTALLATION MANUAL
For the
GDC31 ROLL STEERING CONVERTER
P/N 1049-4000-XX-001( )
REV G
DAC International
6702 McNeil Drive
Austin, TX 78729
©Copyright 2004, DAC International. All rights reserved.
1049-2510-01 G.doc
1049-2510-01
Rev G Page 1 of 47
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DAC GDC31 Specifications

General

Model	GDC31
Category	Media Converter
Distance	20 Km
Fiber Type	Single Mode
Power Supply	5V DC

Summary

Record of Revisions

Introduction

Description

Details the GDC31 Roll Steering Converter's design, features, and capabilities, including its inputs and outputs.

Block Diagram

Visual representation of the GDC31 RSC system, showing its connections to GPS, Annunciator, and Autopilot.

Part Numbers

Lists the available part numbers for the GDC31 Data Converter, including different speed variants.

Regulatory Compliance

Outlines the software development, PMA approval, and environmental standards met by the GDC31.

Supplied Equipment

Optional Equipment

Specifications

Physical Specifications

Details the physical dimensions and weight of the GDC31 LRU and the optional Isolation Coupler.

Electrical Specifications

Covers input voltage, input current, and annunciator lamp current requirements for the GDC31.

Serial Data Input

Specifies the format and baud rate options for serial data input from a GPS navigation system.

Roll Sum Steering Output

Describes the analog bank angle command output, including scale factors and phasing options.

ARINC 429 Output

Details the ARINC 429 digital output, including labels for bank angle command and ground speed.

Reference Inputs

General Description

Explains the AC/DC excitation inputs used to excite the heading bug on the HSI or DG.

AP Ref 1

Details the input specifications for the first reference voltage input (AP Ref 1).

AP Ref 2

Details the input specifications for the second reference voltage input (AP Ref 2).

AP Offset Input

Annunciator Output

Describes the normally open relay contact for controlling an external GPS mode annunciator.

Flag Input

Defines the valid voltage range for the GPS Super Flag input signal.

Certification

Lists the certification standards including PMA, DO-178B, and DO-160D for the GDC31.

Reliability

Provides information on the Mean Time Between Failures (MTBF) for the GDC31 unit.

Operation

Overview

Explains how the GDC31 receives GPS data and computes bank angle commands for the autopilot.

Analog Output

Details the analog Roll Sum Steering (RSS) signal and its interaction with the autopilot.

Reference Inputs (Excitation)

Describes the function and voltage ranges of the two reference inputs for the GDC31.

ARINC 429 Output

Explains the ARINC 429 digital output labels (121 and 312) for autopilot integration.

GPS Mode Annunciator Control

How the GDC31 controls the GPS mode annunciator via a relay contact.

Super Flag Input

Details the function of the Super Flag input and its effect on GDC31 operation.

Installation

Material Not Supplied

Lists essential installation items that are not included with the GDC31 kit.

Special Tools

Specifies the recommended crimp tools and positioners for reliable connector connections.

Mounting Considerations

Guidance on mounting the GDC31 and optional Isolation Coupler in the aircraft structure.

Wiring Considerations

Instructions and recommendations for fabricating wiring harnesses and ensuring continuity.

Steering Output Scale Factor Determination

Procedure for determining the correct scale factor for autopilot integration.

Configuration Pins

Explanation of how program pins (J1-10, J1-22) are used to select RSS output levels.

Phase Selection

Guidance on selecting the correct phase relationship for the steering signal.

Position/Rate Selection

How to configure the GDC31 for position-based or rate-based autopilots via program pins.

Baud Rate Selection

Procedure for selecting the appropriate baud rate for GPS data communication.

GPS Receiver Setup

Instructions for configuring the GPS to output data in the required Aviation Format.

Removal and Replacement

Removal, GDC31

Step-by-step instructions for safely removing the GDC31 unit from the aircraft.

Replacement, GDC31

Step-by-step instructions for installing the GDC31 unit into the aircraft.

Removal, Mode Annunciator

Procedure for removing the Mode Annunciator/Switch from its mounting.

Replacement, Mode Annunciator

Procedure for installing the Mode Annunciator/Switch.

Equipment Checkout

Ground Functional Test

Procedure for verifying GDC31 functionality through ground-based tests.

Flight Functional Test

Procedure for verifying GDC31 functionality during flight operations.

Continued Airworthiness

Environmental

Connector Pin Out

Outline Drawings

GDC31 Outline

Provides dimensional drawing for the GDC31 Roll Steering Converter unit.

Switch / Annunciator Outline

Provides dimensional drawing for the Mode Annunciator/Switch (P10280).

Isolation Coupler Outline

Provides dimensional drawing for the optional Isolation Coupler assembly.

Slide Latch Assembly

Appendix A – Aviation Format

Appendix B – 429 Output

Label 121 - Bank Angle Command

Details the ARINC 429 Label 121 format for bank angle command data.

Label 312 - Ground Speed

Details the ARINC 429 Label 312 format for ground speed data.

Appendix C - Typical Interconnect

Typical Interconnect Diagram

General overview of interconnect diagrams for wiring the GDC31.

Figure 2: KI 525 / 525A with KA 52/KA 57

Wiring diagram for KI 525/525A with KA 52/KA 57 integration.

Figure 3: ARINC HSI with Century IV

Wiring diagram for ARINC HSI with Century IV autopilot integration.

Figure 4: ARINC HSI with S-TEC 50, 55 or 60

Wiring diagram for ARINC HSI with S-TEC 50, 55 or 60 autopilot integration.

Figure 5: NSD 360A / NSD 1000 with Century IV

Wiring diagram for NSD 360A/1000 with Century IV autopilot integration.

Figure 6: NSD 360A / NSD 1000 with S-TEC 50 or 55

Wiring diagram for NSD 360A/1000 with S-TEC 50 or 55 autopilot integration.

Figure 7: ARINC HSI with Century II or III

Wiring diagram for ARINC HSI with Century II or III autopilot integration.

Figure 8: KI 525A with KFC 150

Wiring diagram for KI 525A with KFC 150 autopilot integration.

Figure 9: NSD 360 with ARC 400B (10VAC)

Wiring diagram for NSD 360 with ARC 400B (10VAC) integration.

Figure 10: 52D54 DG with STEC 50, 55 or 60

Wiring diagram for 52D54 DG with STEC 50, 55 or 60 autopilot integration.

Figure 11: NSD 360 with ARC 400B (DC)

Wiring diagram for NSD 360 with ARC 400B (DC) integration.

Figure 12: NSD 360 with Century 2000

Wiring diagram for NSD 360 with Century 2000 autopilot integration.

Figure 13: NSD 360A with Century II or III

Wiring diagram for NSD 360A with Century II or III autopilot integration.

Figure 14: HSI-70C with ARC 1000

Wiring diagram for HSI-70C with ARC 1000 integration.

Figure 15: KI 525A with KFC 200 / 300

Wiring diagram for KI 525A with KFC 200 / 300 autopilot integration.