ARINC 739A : 1996 SUPP 1

1.0 INTRODUCTION AND DESCRIPTION
1.1 Purpose of This Document
1.2 Functions
1.3 System Description
1.4 Interchangeability
1.4.1 General
1.4.2 Interchangeability Desired for the
                ARINC 739A MCDU
1.4.3 "Generation Interchangeability" Consideration
1.5 Regulatory Approval
1.6 Relationship to ARINC 739
2.0 INTERCHANGEABILITY STANDARDS
2.1 Introduction
2.2 Form Factor
2.3 Environmental Conditions
2.4 Interwiring
2.5 Thermal Interface and Design
2.6 Power Circuitry
2.6.1 Primary Power Input
2.6.2 Power Control Circuitry
2.6.3 The Common Ground
2.6.4 The AC Common Cold
2.7 Weights
2.8 Grounding and Bonding
3.0 MCDU DESCRIPTION
3.1 General
3.2 Display
3.3 Keyboard
3.3.1 Basic Function Keys
3.3.2 Specific Function Keys
3.3.3 Alpha-Numeric Keys
3.3.4 Panel Illumination and Annunciator Lights
3.4 MCDU Operation and Display
3.4.1 Typical MCDU Initiation
3.4.2 MCDU Menu
3.4.3 Subsystem Specific Menu
3.4.4 Non-Menu Operation
3.4.5 Scratchpad and Data Field Entry
3.4.6 Clearing Data Fields
3.4.7 Exiting
3.4.8 Proposed Philosophy to Menu Stepping
3.5 MCDU Outputs
3.6 MCDU Inputs
3.7 System Communication
3.7.1 Subsystem and MCDU Identification
3.7.2 Menu Generation
3.7.2.1 Initial Menu
3.7.2.1.1 Addressing and Responses
3.7.2.1.2 Protocol Timing and Responses
3.7.2.2 Menu Changes
3.7.2.3 Alternate Menu Display
3.7.3 Data Communication
3.7.3.1 Subsystem Initiated Messages
3.7.3.1.1 Subsystems Not Currently Active
3.7.3.1.2 Active Subsystems
3.7.3.2 MCDU Communication with Inactive Subsystem
                and Data Request
3.7.3.3 Message Transfer
3.7.3.4 Control (CNTRL) Word
3.7.3.5 Data Word
3.7.3.6 Background/Vector Words
3.7.3.7 Discrete Word
3.7.3.8 Button Push Word
3.8 Built-In Test Equipment (BITE)
3.8.1 BITE Considerations
3.8.2 BITE Display
3.8.3 Self-Test
3.9 Electronic Flight Instrument System Interface
3.9.1 MCDU Outputs to EFI
3.9.2 MCDU Inputs from EFI
3.9.3 MCDU Map Inputs from FMC
3.9.4 Flight Plans and Guidance
3.9.5 Map Display Edit Area
3.9.6 Background Data Prioritizing
3.9.7 Data Type Word Formats
3.9.8 Flight Plan Retention
4.0 NAVIGATION AND DISPLAY CONTROL
4.1 Introduction
4.2 Functional Requirements
4.2.1 System Selection and Control
4.2.2 Navigation Radio Tuning
4.2.2.1 Mode Selection
4.2.2.2 General Operation
4.2.2.3 Navigation Tuning Page Functions
4.2.2.3.1 Tuning Inhibit
4.2.2.4 Interface Requirements
4.2.3 Standby Navigation
4.2.3.1 Mode Selection
4.2.3.2 Operation
4.2.3.2.1 General
4.2.3.2.2 Navigation and Guidance
4.2.3.2.3 CDU Page Access
4.2.3.2.4 Navigation Computations
4.2.3.2.5 Map Display
4.2.3.3 Interface Requirement
4.2.4 Alternate EFIS Control
4.2.4.1 General
4.2.4.2 Page Access
4.2.4.3 Interface
4.2.5 Alternate EICAS Control
4.2.5.1 General
4.2.5.2 Page Access
4.2.5.3 Interface
4.2.6 System Communication
4.2.6.1 Inter-system
4.3 Hardware Requirements
4.3.1 General
4.3.2 Interwiring Definition
4.4 Standby Navigation Lateral Guidance
ATTACHMENTS
1 Standard Interwiring
2 Address Labels
3 Digital Word Formats
4 Character Code Assignments
                (Derived from ISO No. 5)
5 Environmental Test Categories
6 Typical System Configuration
7 Typical Front Panel Layout
8 Glossary
9 Optional MCDU Functions
10 MCDU Display Considerations

Consists of the original ARINC 739 definition with enhancements to allow it to be logged on to up to two systems at one time. Alternate form factors are included to allow the MCDU to be introduced into a wide variety of airframes candidate for CNS/ATM upgrade.