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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 ALPHABETIC CHARACTER CHARACTER KEYS KEYS
FMCS Control Display Unit
Figure 7
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C87482
A
737-300/400/500MAINTENANCE MANUAL
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.
(d)
The entire 24 character spaces of the fourteenth line of the display are used as a scratch pad block for entry of data from the keyboard, or for display of failure messages, operational alerts, and advisory prompts. When a message appears, it is to alert the operator to the occurrence of system or external sensor failures, performance limitations, and errors in manual data entry routines. All messages which appear in the scratch pad can be cleared by using the CLR key of the CDU. Messages will normally be accompanied by illumination of the MSG annunciator at the right side of the CDU panel. The annunciator will be extinguished when the message is cleared from the scratch pad.
(2)
The remainder of the display (twelve 24-character lines) is available for use in displaying data without restriction. This data can consist of information directly applicable to operation of the airplane. The data can also consist of a menu, which allows selection of system functional options.
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737-300/400/500MAINTENANCE MANUAL
C. Alphanumeric Key Group
(1) The CDU alphanumeric keyboard provides the operator with a means of entering data into the system for initialization of the LNAV/VNAV navigation and guidance modes, and for modification of flight plans. The alphanumeric key group also includes the special-purpose slash (/), change sign (+/-), decimal point (.), and clear (CLR) keys. All entries initiated by operation of the alphanumeric keyboard initially appear in the scratch pad area of the display. The scratch pad contents can be edited or cleared by pressing the CLR key. When an entry is present in the scratch pad, a brief depression of the CLR key will clear the last character in the entry. If the CLR key is held down for more than 1 second, the entire entry in the scratch pad will be cleared. The slash key serves to separate data fields where multivariable entries are employed. An example of this type of entry is the definition of a climb speed schedule target airspeed and mach number (300/.780). The decimal point key inserts a decimal point into the scratch pad character string when pressed. The change sign key alternately changes the entry in the scratch pad from a positive to a negative quantity and back again. Repeated depressions of the change sign key simply toggle the positive or negative sense of the scratch pad entry.
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