1.0 INTRODUCTION AND DESCRIPTION
1.1 Purpose and Scope
1.2 Relationship to Other Documents
1.3 Functional Overview
1.4 System Description
1.5 Interchangeability
1.6 Regulatory Approval
1.7 Integrity and Availability
1.8 Reliability
1.9 Testability and Maintainability
1.10 Flight Simulators
2.0 INTERCHANGEABILITY STANDARDS
2.1 Introduction
2.2 Form Factors, Connectors and Index Pin Coding
2.3 Standard Interwiring
2.4 Power Circuitry
2.5 Standardized Signaling
2.6 Environmental Conditions
2.7 Cooling
2.8 Weights
2.9 Grounding and Bonding
3.0 SYSTEM DESIGN CONSIDERATIONS
3.1 System Configurations
3.2 Certification Design
3.3 System Response to Power Interrupts
3.4 Flight Management System Accuracy and
     Performance
3.5 Dual System Design Considerations
3.6 Modularity
3.7 Configuration Data
4.0 FLIGHT MANAGEMENT FUNCTION
4.1 Introduction
4.2 Functional Initialization and Activation
4.3 Functional Description
4.4 Training Simulator Support Functions
5.0 GNSS SENSOR FUNCTION
5.1 Description
5.2 General System Capabilities
6.0 PRECISION LANDING FUNCTION (BLANK SECTION)
7.0 VHF NAVIGATION FUNCTION (BLANK SECTION)
8.0 AIRCRAFT PERSONALITY MODULE DATA
8.1 General Requirements
8.2 APM
8.3 APM Data
9.0 GNU CONTROL AND DISPLAY UNIT INTERFACE
9.1 General
9.2 Standby Navigation
9.3 Self Test
9.4 MCDU Annunciators
9.5 MCDU Alerting
9.6 MCDU Color and Font Usage
10.0 ANTENNAS
10.1 General Requirements
11.0 STANDARD INTERFACES
11.1 General
11.2 Digital Data Input Ports
11.3 Digital Data Output Ports
11.4 Discrete Inputs
11.5 Discrete Outputs
11.6 Intersystem Bus
11.7 Ethernet Interface
11.8 Reserved ATE Ports
11.9 GNU Analog Inputs
11.10 GNU Analog Outputs
11.11 GNU RF Interfaces
11.12 Aircraft Personality Module
11.13 Front Panel Data Load Connector
12.0 ELECTRONIC FLIGHT INSTRUMENT SYSTEM INTERFACE
12.1 General
13.0 COMMUNICATIONS MANAGEMENT UNIT INTERFACE
13.1 General
14.0 DATA BASE STORAGE CONSIDERATIONS
14.1 Introduction
14.2 Navigation Data Base
14.3 Airline Modifiable Information (AMI)
     Data Base
14.4 Performance Data Base
14.5 Magnetic Variation Data Base
14.6 Terrain and Obstacle Data
14.7 Airport Surface Map Data
14.8 Configuration Data Base
15.0 BUILT-IN TEST AND MAINTENANCE PROVISIONS
15.1 General Discussion
15.2 Fault Detection and Reporting
15.3 Ramp Maintenance
15.4 Provisions for Automatic Test Equipment
ATTACHMENTS
1-1 GNU Functional Block Diagram
1-2 System Interface Block Diagram
2-1 GNU Connector Positioning and Pin Layout
2-2 GNU Connector Positioning and Connector
    Layout
3-1 Standard Interwiring
3-2 Notes Applicable to the Standard Interwiring
4-1 ARINC 429 Input and Output Buses
4-2 GNU Outputs
5 Environmental Test Categories
6 DC Power Transient Voltage Requirements
APPENDICES
A Reference Documents
B Acronyms