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FMCS - CONTROL DISPLAY UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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During power-up, the LCD provides a display within 10 seconds
at normal operating temperatures (0-55 degrees C, 32-131
degrees F). At or below freezing temperatures, the LCD can
take up to 2 minutes to provide a normal display. The LCD
contains a temperature regulating function which improves
operation over a wide range of temperatures.
Backlight Assembly
The backlight assembly has a lamp and control circuitry to
provide the required illumination for the LCD. It is controlled by
the P&I CCA.
The backlight assembly also sends ambient light level
information to the P&I CCA so that it can adjust the luminance
level for the LCD. The backlight assembly also sends
temperature information to the P&I CCA so that, when
necessary, it can turn on the LCD heater.
Lighted Switch Panel
The lighted switch panel provides the interface between the
operator and the FMCS through the CDU. The panel contains
two ambient light sensors which are used to adjust the display
brightness and contrast.
FMCS - CONTROL DISPLAY UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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D633A101-SHZ1 Jun 10/2003
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
34-61-00-020
FMCS - CONTROL DISPLAY UNIT - FUNCTIONAL DESCRIPTION
FMCS - CONTROL DISPLAY UNIT - FUNCTIONAL DESCRIPTION
EFFECTIVITY
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FMCS - CONTROL DISPLAY UNIT - FUNCTIONAL DESCRIPTION
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737-600/700/800/900 AIRCRAFT MAINTENANCE MANUAL
Display Format
The multi-purpose control display unit (MCDU) data shows on
the five-inch liquid crystal display (LCD). The basic display is a
set of fourteen lines. Each line can show 24 characters. Each
line can show alphanumeric characters and symbols.
Color
The MCDU contains a liquid crystal display (LCD). It shows
white text on a black background.
Display Layout
The first line shows these data blocks:
* Status
* Title
* Page number.
Status shows that the information on the display is the active
executed plan (ACT) or a modified plan (MOD). When the data
on the display is not active or not a part of the flight plan, the
status block is blank.
The next block is the title for the display. An example of a title is
POS INIT.
The last character spaces in the first line show the page number
for each display. This tells the operator the active page and the
total number of pages.
Data on lines two through thirteen (data field) applies to
operation of the airplane.
Line fourteen is a scratch pad to enter data from the keyboard.
Also, this line shows this data:
* Failure messages
* Alerts during operation
* Advisory prompts.
Alphanumeric Key Board
You use the key board to enter data into the FMCS and to make
changes to a flight plan.
Each time you push an alphanumeric key, the entry shows in
the scratch pad (line 14). In the scratch pad, you can edit the
entry or clear it.
Function and Mode Keys
These are the function and mode keys:
* INIT REF
* RTE
* CLB
* CRZ
* DES
* MENU
* LEGS
* DEP ARR
FMCS - CONTROL DISPLAY UNIT - CONTROLS AND DISPLAYS
EFFECTIVITY
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* HOLD
* PROG
* N1 LIMIT
* FIX
* EXEC.
The INIT REF key supplies access to a selection of data pages
necessary to start the FMCS and ADIRU. Also, the operator can
access navigation data and maintenance pages.
The RTE key selects the page you use to enter route data. This
includes the flight origin and destination plus the takeoff runway
number.
The CLB key shows the climb modes. Top-of-climb (T/C) altitude
and speed/altitude restrictions show here. Information about
　
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