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 N. Engine N1 Indicator
 (1)  The FMC provides command N1 to the engine N1 indicators, through the DAA. This command N1 is displayed on the indicator, when the indicator manual index setting control is pushed-in.
 O. Flight Mode Annunciator (FMA)
 (1)  The FMC interfaces with the pilots FMA, through the DAA. The principle information furnished by the FMC for display on the FMA, is the indication of an active N1 limit operating mode, and whether a reduced N1 limit is active. The FMA also has a P/RST fail annunciator interface through the DAA to the FMC.
 P. Mach/Airspeed Indicator
 (1)  When VNAV is selected on the DFCS mode control panel, the FMC computed target airspeed is displayed on the mach/airspeed indicator. The target airspeed is dependent upon the active flight phase and the pilot selected performance mode for that flight phase.
 Q. Receptacle for Portable Data Loader
 (1)  A receptacle on the P18 panel allows an external portable data loader to interface with the FMC. The portable data loader is used, as required, to load and update the navigation data base of the FMC.
 R. Receptacle for Portable Printer (Optional)
 (1)  A receptacle on the P18 panel allows an external portable printer to interface with the FMC. The printer is used, as required, during system maintenance.
 S. Receptacle for Portable CDU (Optional)
 (1)  A receptacle on the E1-1 shelf allows a portable CDU to interface with the FMC. The portable CDU is used, as required, to access FMS BITE from the E-E bay.
 4. Control Display Unit (Fig. 4)
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.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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