747-400
MAINTENANCE MANUAL
TOP TCAS
ANTENNA
CENTER
LEFT AND RIGHT
LOCALIZER
LOCALIZER
MAIN EQUIPMENT
ANTENNA
ANTENNA
CENTER WEATHER
TOP ATC
CENTER
RADAR
ANTENNA
ANTENNA
AIRPLANES WITH OPERATIONAL TCAS NON-FREIGHTERS WITH GPS
FREIGHTERS WITH GPS
Navigation Antenna Location Figure 1
A39069
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
4. Air Data Standby Instruments (Ref 34-13-00)
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A. The air data standby instruments provide the pilots with standby indications of airplane altitude and indicated airspeed (IAS). The air data standby instruments are pneumatic instruments and receive their inputs from the pitot-static system.
5. Altitude Alert System (Ref 34-16-00)
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A. The altitude alert system provides the pilots with aural and visual indications of actual airplane altitude compared to a selected altitude.
6. Inertial Reference System (Ref 34-21-00)
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A. The inertial reference system (IRS) automatically determines the attitude and navigation data necessary to keep the airplane on a predetermined course. This is accomplished without external navigational aids through the use of accelerometers and laser gyros monitored by a digital computer. The pertinent navigation data is displayed on flight instruments, allowing the pilots to fly the airplane using IRS data. The data is also supplied to the autopilot when operating in the IRS mode for automatic control of airplane heading.
7. Standby Magnetic Compass (Ref 34-22-00)
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A. The standby magnetic compass is provided for use as the heading
reference should other heading references fail or malfunction.
8. Standby Attitude/ILS Indication System (Ref 34-24-00)
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A. The standby attitude/ILS indication system provides a visual display of airplane attitude in pitch and roll at all times during flight. The system also displays vertical and horizontal deviation from the ILS approach path to the runway.
9. Instrument Landing System (Ref 34-31-00)
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A. The instrument landing system (ILS) determines lateral (localizer) and vertical (glide slope) deviation of the airplane relative to the runway during landing approaches and displays this information on the PFD's, ND's, and the standby attitude/ILS indicator.
10. Marker Beacon System (Ref 34-32-00)
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A. The marker beacon system provides the pilots with visual and aural annunciations when the airplane flies over airways, inner, middle, and outer markers.
11. Radio Altimeter System (Ref 34-33-00)
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A. The radio altimeter system provides the pilots with vertical position information during approach and landing phases of flight operation. The system transmits a continuous signal of varying frequency to the ground which is reflected back to the airplane and mixed with a portion of the transmitting signal. The resultant beat frequency signal is proportional to airplane altitude and is displayed as a numerical value on the PFD's.
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ALL ú ú 06 Page 3 ú Feb 10/89
BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
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747-400
MAINTENANCE MANUAL
12. Weather Radar System (Ref 34-43-00)
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A. The weather radar system provides the pilots with a visual radarscope display of weather conditions ahead of the airplane. This presentation in terms of range and azimuth enables course changes to be made to avoid turbulent areas. A mapping mode is also included for radarscope presentation of terrain features on most airplanes.
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