ARINC 706-4 : 1988

1.0 INTRODUCTION
1.1 Purpose of This Document
1.2 Summary of Operational Characteristics
1.3 Brief Description of the System
1.4 Interchangeability
ARINC 706 Air Data System
Considerations
1.5 Regulatory Approval
1.6 Reliability
1.7 Industry Views on Dual ADS
2.0 INTERCHANGEABILITY STANDARDS
2.1 Introduction
2.2 Form Factor, Connector and Index Pin Coding
2.3 Standard Interwiring
2.4 Power Circuitry
2.5 System Functions and Signal Characteristics
2.6 Airframe-Unique Functions
2.7 Environmental Conditions
2.8 Cooling
2.9 Grounding and Bonding
3.0 SYSTEM DESIGN
3.1 Pitot and Static Air System
3.2 Temperature Sensor
3.3 Altitude Baro-Correction Sources
3.4 Indicated Angle of Attack Sensors
3.5 Digital Signal Standards
3.6 Indicator Standards
4.0 COMPUTER UNIT DESIGN
4.1 Introduction
4.2 Pressure Limits
4.3 Computer Leak Rate
4.4 Computer 'Pressure' Volume
4.5 Airframe-Unique Functions
4.6 Monitoring and Failure Warning
4.7 Functional Test Provisions
4.8 Standard Temperature Sensor Characteristics
4.9 General Characteristics of ADS Computer
      Outputs
4.10 Specific Characteristics of ADS Computer
      Outputs
4.11 ADS Computer Inputs
4.12 Special Environmental Testing
      Considerations
5.0 ADS APPLICATIONS NOTES
5.1 Introduction
5.2 ADS Output Signals for Other Accessory
      Users versus Separately Generated
      Signals in those Accessories
6.0 PROVISIONS FOR AUTOMATIC TEST EQUIPMENT
6.1 General
6.2 Unit Identification
6.3 Use of ATLAS Language
7.0 BUILT-IN TEST EQUIPMENT (BITE)
7.1 Built-In Test Equipment (BITE)
7.2 Display
7.3 Fault Monitor
7.4 Self-Test Initiation
7.5 Monitor Memory Output
ATTACHMENTS
1 ADS Computer Connector and Pneumatic
    Fitting Locations
2 Standard Interwiring
    Notes Applicable to the Interwiring
3 Accommodation of Airframe-Unique Functions
4 Environmental Test Categories
5 Table 5-1 Resistance Vs Temperature (C DEG)
    for 500 Ohm PCI Platinum Sensing Elements
6 ADS Performance Envelope
7 Digital Data Standards - Table 7-1
    Output Data Standards
Table 7-2 BNR Data Encoding Examples
Table 7-3 BCD Encoding Examples
Table 7-4.1 ADS Discrete Word No. 1 Format
Table 7-4.2 ADS Discrete Word No. 2 Format
Table 7-5 Data Bus Loading
8 Indicator Design Guidance
APPENDICES
1 Symbols, Definitions and Equations
2 Chronology and Bibliography

Describes the characteristics of a digital ADS intended for installation in subsonic commercial transport aircraft. Provides essential air data information for display to pilots and for use by other aircraft systems.