Abbreviations and Acronyms

· AC - alternating current

· ACP - audio control panel

· ADF - automatic direction finder

· alt - alternate

· altn - alternate

· app - approach

· ARINC - Aeronautical Radio, Inc.

· ATC - air traffic control

· ATE - automatic test equipment

· auto - automatic

· B - both

· BITE - built-in test equipment

· BL - buttock line

· CAPT - captain

· CDU - control display unit

· circ - circulator

· CPU - central (control) processing unit

· DC - direct current

· DEU - display electronics unit

· DME - distance measurement equipment

· EFIS - electronic flight instrument system

· F/O - first officer

· FCC - flight control computer

· FDAU - flight data acquisition unit

· FMC - flight management computer

· FMCS - flight management computer system

· freq - frequency

· fwd - forward

· grd - ground

· I/C - intercom

· ILS - instrument landing system

· LCD - liquid crystal display

· LED - light emitting diode

· LRU - line replacable unit

· maint - maintenance

· MHz - megahertz

· MKR - marker beacon

· nav - navigation

· NCD - no computed data

· ND - navigation display

· NORM - normal

· PFD - primary flight display

· R - range

· rcvr - receiver

· REU - remote electronics unit

· RF - radio frequency

· rly - relay

· R/T - receive/transmit

· spkr - speaker

· sta - station

· TCAS - traffic alert and collision avoidance system

· TFR - transfer

· TX - transmitter

· V - voice

· V - volts

· VHF - very high frequency

· xfr - transfer

· xmtr - transmitter

· xpndr - transponder

 

DME SYSTEM - GENERAL DESCRIPTION

General

The DME system has two DME interrogators and two antennas.

Description

The interrogators get manual tune inputs and flight management computer system (FMCS) autotune inputs from the navigation control panel. If the NAV control panel tune inputs fail, the interrogators get autotune inputs directly from the FMC.

The DME system sends data to the display electronics units to show on the primary flight displays (PFDs) and navigation displays (NDs).

The DME system sends data to these units:

· Flight control computers (FCC)

· Flight management computer System (FMCS)

· Flight data acquisition unit (FDAU)

· Remote Electronics Unit (REU).

The FCCs use DME data as an input to calculate the VOR capture point in the autopilot VOR mode. The DME data is also used in the VOR mode to find when over station is sensed (OSS) for the VOR ground station.

The FMCS uses DME data to calculate FMC position updates. The flight data acquisition unit receives DME data, formats it, and sends it to the flight data recorder.

The REU receives audio from the DME station and sends it to the flight deck headsets and speakers.

The DME system sends and receives a suppression pulse between these units:

· DME

· ATCs

· TCAS.

The DME interrogator receives the station audio identifiers and sends them to the remote electronics unit (REU).

 

 

 

 

DME SYSTEM - COMPONENT LOCATION - FLIGHT COMPARTMENT

General

These are the components in the flight compartment that have an interface with the DME system:

· FMC source select switch

· Left inboard and outboard display units

· Left and right EFIS control panels

· Right inboard and outboard display units

· Captain’s and first officer’s NAV control panel

· Captain’s and first officer’s audio control panel.

 

 

DME SYSTEM - COMPONENT LOCATION - ELECTRONIC EQUIPMENT COMPARTMENT AND ANTENNAS

DME Component Locations

These components are in the electronics equipment

compartment:

· DME 1 interrogator

· DME 2 interrogator.

These components are on the exterior of the airplane:

· DME 1 antenna

· DME 2 antenna.

 

 

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