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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500
MAINTENANCE MANUAL
AMBIENT LIGHT SENSORS FOR AUTOMATIC CRT CONTRAST ADJUSTMENT (2)
DATA STATUS BLOCK
LINE SELECT KEYS
SCRATCH PAD/ MESSAGE BLOCK
FUNCTION KEYS (10)
PAGE SELECT KEYS PAGE NUMBER BLOCK
TITLE BLOCK FIVE INCH CRT, FOURTEEN 24-CHARACTER LINES
DATA BLOCK
LINE SELECT KEYS
FLIGHT PHASE KEYS (3)
CRT BRIGHTNESS
ADJUSTMENT
EXECUTE KEY
ANNUNCIATOR BAR
NUMERIC CHARACTER KEYS ALPHABETIC CHARACTER KEYS
FMCS Control Display Unit
Figure 4
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ú Feb 25/87
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL
A. A Control Display Unit (CDU) is included in the FMCS. The CDU allows the operator to interface with the FMC.
B. CDU Data Display
(1) The CDU data displays are presented to the operator on the five-inch Cathode Ray Tube (CRT). The basic display format consists of an array of fourteen 24-character lines. A variety of alphanumeric characters and symbols can be presented on each line in the form of an intensity-modulated raster scan, under the control of the FMC. The basic display format is subdivided by specifically defined display data blocks, for example:
(a)
The first five character spaces in the first line of the display are reserved for a prefix to the page-identifying title. The prefix indicates whether the information currently on the display is the active executed plan (ACT) or a modification (MOD) to the active plan. If this data status block is blank, the data on display is either not plan-specific or not active.
(b)
The next 14 character spaces of the first line of the display are reserved for an identifying title for the display. The title may be a simple one which identifies the type of information presented in a data display (PROGRESS, for instance). However, the title may be more complex, perhaps identifying a display which corresponds to a particular flight phase, and the mode of operation in that phase (ECON CRZ CLB).
(c)
The remaining five character spaces in the first line form the page number for each display. This tells the operator the position of the current display in a string of pages that might exist for some FMCS functions.
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