ARINC 704-7 : 1999

1.0 INTRODUCTION AND DESCRIPTION
1.1 Purpose
1.2 Functions and Modes of Operation
1.3 Reliability
1.4 Unit Description
1.5 Interchangeability
1.6 Regulatory Approval
1.7 Testability and Maintainability
2.0 INTERCHANGEABILITY STANDARDS
2.1 Form Factors, Connectors, and Index Pin Coding
2.2 Input and Output Signal Characteristics
2.3 Standard Interwiring
2.4 Power Circuitry
2.5 Weights
2.6 Thermal Interface and Design
2.7 Environmental Test Categories
2.8 Inertial Reference Unit Mounting
2.9 Airplane Dynamic Environment
3.0 SYSTEM DESIGN CONSIDERATIONS
3.1 General
3.2 Basic Modes of System Operations
3.3 Outputs
3.4 Integrity Monitoring and Self-Test
3.5 Inertial Reference System Accuracy
3.6 Initialization Protocol
3.7 Heading Set (ATTitude Mode Only)
3.8 IRS Updating with GNSS Data
4.0 STANDARD SIGNAL CHARACTERISTICS
4.1 General Accuracy and Operating Ranges
4.2 Data Signals
4.3 Control Signals
5.0 CONTROL/DISPLAY UNIT (CDU) DESIGN
5.1 General
5.2 Form Factors and Connector
5.3 Cooling
5.4 Panel Illumination
5.5 Annunciator Dimming
5.6 Power Supply for CDU Operation
5.7 CDU Interface Summary
5.8 Liquid Spillage Protection
5.9 Display Test
6.0 PROVISIONS FOR AUTOMATIC TEST EQUIPMENT
6.1 General
6.2 Unit Identification
1 Notes Applicable to Standard Interwiring
2 Standard Interwiring
3 Standard Interwiring - Top and Middle Insert Pin Usage
4-1 IRU Rear Connector View
4-2 Inertial Reference Unit (IRU) - Dimensions and Tolerances
4-3 IRU Mounting Tray - General Layout
4-4 Tray Front View
5-1 CDU Connector Pin Layout/Usage
5-2 Control/Display Unit (CDU) Outline and Mounting
6 704 IRS Block Diagram
6-1 743 GPS/704 IRS Block Diagram
6-2 743 GPS/704 IRS Interconnect Diagram
7 Navigational Mnemonics Defined
8 Environmental Test Categories
9 Digital Control Word Format
10 IRS Digital Summary - Inputs/Outputs
10-1 Additional ARINC 429 Outputs for ARINC 704 (IRS) When Used
        with ARINC 743A (GNSS)
10-2 Discrete Word Outputs from ARINC 704 (IRS) When Used
        with ARINC 743A (GNSS)
11 CDU Annunciator Display Dimming
12-1 Additional ARINC 429 Inputs for ARINC 704 (IRS) When Used
12-2 Discrete ARINC 429 Input Definition for ARINC 704 (IRS) When
        Used with ARINC 743A (GNSS)
13 GPS Time Mark
APPENDICES
1 Bibliography of the AEEC ARINC 704 Inertial Reference System
     Project
2 Non-Standard Applications

Describes the desired performance of inertial measuring devices and associated electronics specifically designed for installation in commercial transport aircraft.