Description and Operation 1 ALL General 1 Antenna - GPS 1 Displays - GPS 6 Modes of Operation - GPS 9 Position Determination - GPS 1 Signals - GPS 9 Operation 10
 Component Location 101 ALL Component Index Component Location
 Adjustment/Test 501 ALL General 501 Operational Test 501 Test - GPS System 502
 ANTENNA - GPS 34-58-02 Removal/Installation 401 ALL
 POSITION COMPUTING  34-60-00
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 34-CONTENTS
 GUN Page 15 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A 747-400 MAINTENANCE MANUAL
 CHAPTER 34 - NAVIGATION
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 FLIGHT MANAGEMENT COMPUTER SYSTEM 34-61-00
 Description and Operation 1 ALL General 1 Control Display Unit 40 Failure Detection 80Y Flight Management Computer 7 FMC Messages 81 FMCS Overview 1 FMCS/Integrated Display System 55
 Interface
 Guidance 77
 Navigation 57
 Operations 82
 Performance 72
 Thrust Management 80

 Component Location 101 ALL Component Index Component Location
 Maintenance Practices 201 ALL
 Adjustment/Test 501 ALL General 501 Ground Test - Flight 505
 Management Computer Servo Loop Ground Test - Flight 501 Management Computers System Test 508 BITE DATA DOWNLOAD - FLIGHT 34-61-11 MANAGEMENT COMPUTER Maintenance Practices 201 [*] [*] AIRPLANES WITH FMC SOFTWARE PS4052540-940 AND SUBSEQUENT
 COMPUTER - FLIGHT MANAGEMENT 34-61-01 Removal/Installation 401 ALL
 LOADER - AIRBORNE DATA 34-61-03 Description and Operation 1 ALL Removal/Installation 401 ALL
 34-CONTENTS
 GUN Page 16 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
747-400 MAINTENANCE MANUAL
 CHAPTER 34 - NAVIGATION
 TABLE OF CONTENTS
_________________
 Chapter Section Subject_______ Subject ____ Effectivity
_______ Page ___________
 RELAY - FLIGHT MANAGEMENT 34-61-05 COMPUTER MASTER Removal/Installation 401 ALL UNIT - CONTROL DISPLAY 34-61-02 Servicing 301 ALL Cleaning - Cooling Air Inlet 301 Screen Cleaning - CDU Display 302 Screen Replacement - CDU 302 Annunciator Lamp Replacement - EXEC Key 304 Lamp Removal/Installation 401 ALL
 34-CONTENTS
 GUN Page 17 Feb 18/02
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
 1.

2.

3.

A
747-400 MAINTENANCE MANUAL
 NAVIGATION - DESCRIPTION AND OPERATION
______________________________________
General
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 A.  The navigation systems are those systems used to determine and display the attitude, altitude, and position of the airplane with respect to the earth's surface. The navigation systems fall into the following general catagories:
 (1)  
Those systems which sense and display flight environmental data.

 (2)  
Those systems which determine airplane attitude and direction.

 (3)  
Those systems which provide landing and taxiing aids.

 (4)  
Those systems which are self-contained and independent of ground-based equipment.

 (5)  
Those systems which are dependent upon and operate in conjunction with ground-based equipment.

 (6)  
Those system which compute airplane position.

 B.  The various navigation units are located in four main equipment centers throughout the airplane and are remotely controlled and displayed from the flight compartment. These equipment centers are:
 (1)  
Forward equipment center

 (2)  
Main equipment center

 (3)  
Forward center fuselage equipment center

 (4)  
Aft center fuselage equipment center

 C.  Receiving and/or transmitting antennas required by navigation systems are located externally on the airplane as shown in Fig. 1.
 D.  Navigation system information is displayed on the primary flight displays (PFD) and the navigation displays (ND). The PFD's and ND's are described in the integrated display system (Ref 31-61-00).
Pitot Static System (Ref 34-11-00)
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 A.  The pitot-static system senses the dynamic (pitot) and ambient (static) air pressure external to the airplane and supplies these two pressures to the equipment and instruments for determining airplane altitude and motion.
Air Data System (Ref 34-12-00)
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 A.  The air data system provides air data information to all airplane interfacing systems and equipment except for the elevator feel computer and the standby instruments. The air data computer outputs are on four electrically isolated ARINC 429 output data busses. All of the busses contain the same computed values of altitude, vertical speed, airspeed, mach number, and air temperature. These outputs are derived from dynamic (pitot) pressure, ambient (static) pressure, total air temperature, angle of attack, and barometric pressure setting.
　
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