ALTITUDE
SELECT
CONTROL

DFCS MODE CONTROL PANEL (EXAMPLE)

Flight Management Computer System Component Location
Figure 1 (Sheet 5)

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C87474
A 737-300/400/500MAINTENANCE MANUAL

FLIGHT MANAGEMENT COMPUTER
I
ELECTRICAL CONNECTOR

FUEL SUMMATION UNIT
J Flight Management Computer System - Component Location Figure 1 (Sheet 6)
C87476
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 737-300/400/500MAINTENANCE MANUAL

FMCS BITE PRINTER RECEPTACLE (OPTIONAL)
AND DATA TRANSFER UNIT RECEPTACLE

RECEPTACLE FOR PORTABLE CDU (OPTIONAL)

Flight Management Computer System Component Location
Figure 1 (Sheet 7)

EFFECTIVITYùùùùùùùùùùùùùùùùùùùùùùùùùùùùùù. AIRPLANES WITH DUAL FMC ú

 34-62-01

 ú CONFIG ú 01 Page 8 ú Nov 15/93
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
C87477
A
737-300/400/500MAINTENANCE MANUAL
 (11)
 Ground Proximity Warning System (Chapter 34-42)

 (12)
 DME System (Chapter 34-55)

 (13)
 Nose Cowl Anti-Icing (Chapter 75-11)

 (14)
 Variable Bleed Valve System (Chapter 75-32)

 (15)
 Engine Tachometer System (Chapter 77-12)

 2.  FMCS Overview_____________
 A.  The FMCS furnishes lateral and vertical navigation and guidance, cost-optimal speed and thrust targets, and percent N1 limit data. These targets and data may be coupled to the airplanes Digital Flight Control System (DFCS), from the beginning of the climbout phase to glide slope intercept or flaps deployment. The FMCS is available throughout the entire flight. However, all other automatic flight control, inertial and radio navigation systems in the airplane are operative, with or without the FMCS.
 B.  The FMCS performs many routine system integration tasks. In addition the FMCS acts as the focal point to manage an automatic flight of the airplane. The FMCS performs the following functions to provide the capability of automated flight control:
 (1)
Optimal performance computation

 (2)
Navigation and position determination

 (3)
Air data and navigation sensor management

 (4)
Flight planning

 (5)
Guidance and steering, both laterally and vertically

 (6)
Self test

 C.  The basis of the FMCS capabilities is in the FMC program software. The software includes a performance data base and a navigation data base. Aerodynamic and engine performance models of the airplane are stored in the performance data base. The stored information is used to predict performance characteristics that govern the airplane optimal vertical profile. The navigation data base contains all information required for operation in a specified geographic area. This information includes navigation data on VORTAC stations, waypoints, airports, runways, enroute airways, and company routes. The navigation data is valid for a specified period of time. At the end of the time period a new navigation data base must be loaded into the FMC. When the airplane is on the ground a new navigation data base can be loaded into the FMC, by means of an external portable data loader. The program software also includes the logic that commands the digital flight control system, and the auto throttle. Sensor systems on the airplane provide inputs of air data, navigation, and airplane performance parameters. These inputs are received and checked by the FMCS, and then used for the refreshment of guidance information, which commands automatic flight controls and radio navigation system tuning.
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