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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

slide2
Topics
  • Introduction
  • MCDU Screen
  • Fonts
  • Line Select Keys
  • Annunciators
  • Function Keys
slide3
Introduction

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

slide4
MCDU Screen

Page Title

Page Number/

Number of Pages

Active (ACT) or Modified (MOD) Status

Scratchpad

Erase Prompt

slide5
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

slide6
Large Font: manual entries and waypoint information from navigation database

Medium Font: computed or system generated data

Small Font: data field units

ATC

VNAV

slide7
Annunciators

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)

slide8
Line Select Keys (LSK)

L1

L2

L3

L4

L5

L6

R1

R2

R3

R4

R5

R6

slide9
EXEC 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

slide10
MENU 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

slide11
Function Keys

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

slide12
Function Keys

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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