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 2)  Make sure the GPS L position is shown on the line above the GPS R position.
 NOTE:____ As much as 10 minutes of time can be necessary for the positions to show on the CDU.
 (e)  If the GPS position is not displayed after 10 minutes, check to see if the GPS is enabled.
 1) 2) 3) 4) 5) 6)  Push the PREV PAGE key on the CDU.Make sure that the prompt below GPS NAV reads INHIBIT> on the POS REF 2/3 page.If the prompt below GPS NAV reads ENABLE>, push the adjacent LSK.Make sure that the prompt changes to read INHIBIT>.Push the NEXT PAGE key on the CDU.Make sure that the POS REF 3/3 page shows the position of GPS L and GPS R.
 S 864-024
 (5)  Remove electrical power if it is not necessary (AMM 24-22-00/201).

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 34-58-02
 ALL  ú ú 08 Page 406 ú Jun 15/98
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 FLIGHT MANAGEMENT COMPUTER SYSTEM - DESCRIPTION AND OPERATION
_____________________________________________________________
 1.  General (Fig. 1)_______
 A.  The Flight Management Computer System (FMCS), a subsystem of the Flight Management System (FMS), provides the functions of lateral guidance (LNAV), vertical guidance (VNAV), flight planning, airplane performance and thrust management.
 B.  The FMCS is capable of constructing the most economical flight path (lateral and vertical) from airplane takeoff to touchdown. This is accomplished by the integration of the FMCS's guidance, performance, autothrottle and navigation functions. Outside data is supplied by interfacing Line Replaceable Units (LRUs) and pilot inputs via the CDUs and control panels. In addition to outside data the FMCS uses two data bases, the navigational data base and the performance data base, for additional data.
 C.  The guidance function sends commands to the Automatic Flight Director System (AFDS) for airplane flight control. The autothrottle function sends autothrottle servo commands to the servo motor and trim commands to the electronic engine controllers for thrust control. The navigation function sends data to the guidance function for flight control, data to the Electronic Flight Instrument Systems (EFIS) for display purposes and tuning comands for autotuning the VHF nav radios. The performance function calculates and provides data, pertaining to optimal performance, to the guidance and autothrottle functions.
 D.  The FMCS consists of two Flight Management Computers (FMCs) for command processing and three Control Display Units (CDUs) for pilot/airplane system interfaces (Fig. 1).
 (1)  
The two FMCs are located on the E2 rack in the main equipment center (Fig. 1).

 (2)  
The three CDUs are located in the flight compartment's P9 forward electronic control stand (Fig. 1).

 2.  FMCS Overview_____________
 A.  The FMCS provides fully automated flight control of navigation, performance, thrust management and guidance. The FMCS's control of these functions alleviate a significant portion of the crews workload, therefore leaving more time for the crew to work on tasks requiring more attention.
 B.  The FMCS relies on its programmed computer software for flight control. This software contains the aerodynamic parameters, engine performance model and command logic. In addition, the FMCS uses data from other airplane systems to compute command signals for airplane guidance and thrust control as well as creating a predetermined vertical and lateral flight profile.
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 34-61-00
 ALL  ú ú 01 Page 1 ú Dec 10/88
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400
MAINTENANCE MANUAL

PILOT'S CENTER 
INSTRUMENT PANEL 
AUTOFLIGHT CONTROL  SEE  B 
PANEL 
SEE  C  FIRST OFFICER'S 
INSTRUMENT PANEL 
CAPTAIN'S MAIN  SEE  D 
INSTRUMENT PANEL 
SEE  D 
BOOKCASE 
SEE  F  G  H 
PILOT'S CONTROL 
FORWARD ELECTRONIC  STAND PANEL 
CONTROL PANEL  SEE  A 
　
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