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DME SYSTEM - GENERAL DESCRIPTION

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DME SYSTEM - GENERAL DESCRIPTION

DME SYSTEM - GENERAL DESCRIPTION - раздел Механика, DISTANCE MEASURING EQUIPMENT - INTRODUCTION General The Dme System Has Two Dme Interrogators And Two Antennas....

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).

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DISTANCE MEASURING EQUIPMENT - INTRODUCTION

Purpose... The distance measuring equipment DME system supplies slant range line of... DME SYSTEM COMPONENT LOCATION FLIGHT COMPARTMENT General...

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Abbreviations and Acronyms
· AC - alternating current · ACP - audio control panel · ADF - automatic direction finder · alt - alternate · altn - alternate · app - approach

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

DME Outputs
Each DME interrogator has two output buses. One output bus supplies data to the on-side flight control computer (FCC). DME 1 sends data to FCC A and DME 2 sends data to FCC B. the other Output bus

General
The navigation (NAV) control panels supply frequency inputs and test commands to these navigation radios: · DME · ILS · VOR. When you put a paired VOR or ILS fre

Operation
The NAV control panels have an active frequency display window and a standby frequency display window. The frequency that shows in the active frequency display window is the frequency that the navi

Operation
The CPU uses tune inputs to tune the frequency synthesizer. The CPU give a signal to the transmitter to send interrogation pulses. The transmit pulses go through a circulator then to the DME antenn

DME SYSTEM - SELF TEST
Self Test Push the test switch on the DME interrogator to start a DME selftest. Front Panel Displays The LED status indicators go through this sequence: · The LR

General
During a ground test or a self test, the display units show these indications: · The DME fail condition for two seconds · The DME NCD condition for the next two seconds ·