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B737 GPS/FMS. Part 4: MCDU Introduction. Topics Introduction MCDU Screen Fonts Line Select Keys Annunciators Function Keys. Introduction The Multifunction Control Display Unit (MCDU) forms is the primary interface between the pilot and the GPS Flight Management System. MCDU Screen.

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Part 4 mcdu introduction

B737 GPS/FMS

Part 4: MCDU Introduction


Topics

  • Introduction

  • MCDU Screen

  • Fonts

  • Line Select Keys

  • Annunciators

  • Function Keys


Introduction

The Multifunction Control Display Unit (MCDU) forms is the primary interface between the pilot and the GPS Flight Management System.


MCDU Screen

Page Title

Page Number/

Number of Pages

Active (ACT) or Modified (MOD) Status

Scratchpad

Erase Prompt


1 Display Screen: 14 lines with 24 characters

Amber: alert scratchpad messages

Cyan: page titles and prompts

Green: fixed data fields, field titles and waypoint names

Magenta: identifies the TO waypoint on ACT LEG page and PROG page 1

Red: major change (confirmation of system reconfiguration

White: computed (dynamic) data, data entry and advisory messages


Large Font: manual entries and waypoint information from navigation database

Medium Font: computed or system generated data

Small Font: data field units

ATC

VNAV


Annunciators navigation database

POS Annunciator: illuminates when the aircraft’s navigation is in dead reckoning

OFST Annunciator: illuminates during offset (parallel) track navigation

FAIL

MSG

POS

OFST

IND

ATC

MSG Annunciator: illuminates when a caution or warning alert message appears in the scratchpad field of the MCDU display

IND Annunciator: illuminates when the FMS is operating in independent mode

FAIL Annunciator: illuminates at maximum with the display upon detection of a major MCDU failure

ATC Annunciator: illuminates to indicate the reception of Air Traffic Control message (when implemented)


Line Select Keys (LSK) navigation database

L1

L2

L3

L4

L5

L6

R1

R2

R3

R4

R5

R6


EXEC navigation database Key: used to accept modifications to the active route (flight plan) performed on the LEGS, RTE (route) or HOLD pages

EXEC Annunciator: illuminates when a modification to the active route is in progress, but has not been executed

BRT Key: controls the brightness of the screen and annuciators

CLR Key: 1) clears one character to the left during scratchpad data entry.

2) when pressed and held for more than 1 second, it clears the entire scratchpad

3) clears advisory and alert messages in the scratchpad

4) with the scratchpad empty, pressing the CLR key will display a DELETE in the scratchpad that can be used with a LSK next to the data to be removed


MENU navigation database Key: provides access to the MCDU MENU page that allows access to other subsystems connected to the MCDU

MENU Annunciator: illuminates when a subsystem request or malfunction exists

Alpha-numeric keypad: provides the letters A-Z and numbers 0-9. E, N, S and W are circled denoting East, North, South and West

PREV Key: when multiple pages are indicated in the page title line, pressing the PREV key backs up the display to the previous page or to the last page if presently on Page 1

NEXT Key: when multiple pages are indicated in the page title line, pressing the NEXT key advances the display to the next higher page number or to Page 1 if presently on the last page

+/-: first press produces “-” and second press produces a “+”

/ Key: separates data fields in scratchpad entry

SP: separates data fields in scratchpad entry

. Key: provides a decimal point for numeric entries


Function Keys navigation database

INIT REF: provides access to pages of data required for initialization and various categories of reference data

RTE: provides access to the ROUTE page for the definition of routes entered into the FMS

DEP/ARR: provides access to page for the definitions of departure and arrival procedures and runways

FMC

COMM

VNAV

ATC

LEGS: displays the LEGS pages containing detailed data concerning each leg of the flight plan

PROG: accesses the PROGRESS pages for display of current flight and navigation status information


Function Keys navigation database

ATC: (not activated) provides access to the ATS communication function

FMC COMM: (not activated) provides access to system AOC communication (ACARS) functions

VNAV: (not activated) provides access to the vertical navigation functions

FMC

COMM

VNAV

ATC

HOLD: accesses the HOLD pages for the definition of HOLDING procedures at a designated waypoint or present position

FIX: accesses the FIX page for display bearing/distance information relative to a fix. Facilitates creation of fixes for use in flight planning


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