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

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

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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
 (3)
Autothrottle System (Chapter 22-31)

 (4)
Fuel Quantity Indicating System (Chapter 28-41)

 (5)
Wing Thermal Anti-Icing System (Chapter 30-11)

 (6)
Air Data Pressure Instruments (Chapter 34-12)

 (7)
Inertial Reference System (Chapter 34-28)

 (8)
VOR/ILS Navigation System (Chapter 34-31)

 (9)
DME System (Chapter 34-55)

 (10)
 Nose Cowl Anti-Icing (Chapter 75-11)

 (11)
 Variable Bleed Valve System (Chapter 75-32)

 (12)
 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.
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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E.
F.
G.
A 737-300/400/500MAINTENANCE MANUAL
 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.Through manipulation of the Control Display Unit (CDU) keyboard keys, the operator controls and selects the operating modes of the Flight Management System (FMS). In addition, through manipulation of the keys the operator may obtain a large selection of advisory data concerning the present state of the airplane. Also the operator may obtain data on other flight options they may wish to pursue. The CDU data appears on a cathode-ray tube screen. The cathode-ray tube permits information to be presented in a clear and concise fashion. Through CDU operating and data entry procedures, and through the use of plain text, the functional displays of the FMCS are formed into a cohesive group of CDU pages. These pages lead the pilots through preflight and inflight operation of the system.The FMCS provides guidance commands to the DFCS and to the A/T, as well as tuning commands to VOR and DME radio navigation systems. The FMCS also provides data for display on the pilots navigation, air data, and engine instruments.Present position, velocity, and heading data are produced by the Inertial Reference System (IRS). The FMCS combines these IRS data with range and bearing from DME and VOR stations, for the best determination of airplane present position, velocity and track.Built-In-Test-Equipment (BITE) is a function of the FMCS. The BITE function provides continuous monitoring of the Flight Management Computer (FMC) and Control Display Unit (CDU). Also BITE provides continuous monitoring of sensors and components that interface with the FMCS. When the airplane is on the ground the BITE also performs the task of overall FMS testing, upon demand by maintenance personnel. The CDU acts as the focal control and display when testing and monitoring the operational readiness status of the FMCS, DFCS, A/T, and IRS. Fault histories of the various sensor systems are also tracked and stored for later reference.
　
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