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GEAR
DN
GEAR UP
DN
UP
DOWN
GEAR
EICAS DISPLAY
1
2
3
December 01, 1999
747 Operations Manual
Landing Gear -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.10.7
2 Expanded Gear Position Indication (Non–Normal Display)
DN (green) – related landing gear down and locked.
Crosshatched (white) – related landing gear in transit.
UP (white) – related landing gear up and locked.
3 Expanded Gear Position Indication (Inoperative Display)
X (amber) – landing gear position indicators inoperative.
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
14.10.8 D6-30151-425
Landing Gear -
Controls and Indicators
Gear Synoptic Display
The landing gear synoptic is displayed by pushing the GEAR synoptic display
switch on the display select panel. Display select panel operation is described in
Chapter 10, Flight Instruments, Displays.
1 Brake Temperature
Indicates a relative value of wheel brake temperature:
• values range from 0 to 9
• white – normal range
• amber – high range
2 Gear Door Status
Crosshatched – door not closed.
CLOSED (white) – door closed.
Empty box(es) (white) – related landing gear door position indicators inoperative.
LIMITER LIMITER
LIMITER LIMITER
LIMITER LIMITER
LIMITER LIMITER
LIMITER LIMITER
LIMITER LIMITER
LIMITER LIMITER
LIMITER LIMITER
TILT TILT
TILT TILT
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID
ANTISKID ANTISKID
ANTISKID
2
2 2
2 2
2 2
2 2
2 2
2 2
2 2
6
BRAKE TEMP
CLOSED CLOSED
CLOSED
CLOSED
GEAR DOORS
1
2
SECONDARY EICAS DISPLAY
3
April 01, 2001
747 Operations Manual
Landing Gear -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.10.9
3 Disabled System Messages
TILT (amber) - main gear truck not in full tilt positions.
ANTISKID (white or amber) - loss of antiskid protection to related wheels.
LIMITER (white or amber) - torque limiting control fault detected.
Compacted Brake Temperature Indications
1 Brake Temperature
Indicates a relative value of wheel brake temperature:
• values range from 0 to 9
• white – normal range
• amber–highrange
BRAKE TEMP
2
2
2
2
2 2
2 2
2
2 2
2 2 2
5 8
1
April 01, 2001
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
14.10.10 D6-30151-425
Landing Gear -
Controls and Indicators
Intentionally
Blank
April 1, 2000
747 Operations Manual
Landing Gear Chapter 14
System Description Section 20
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.20.1
Introduction
The airplane has four main landing gear and a single nose gear. The nose gear is a
conventional steerable two–wheel unit. The main gear consist of two steerable
body gear and two non-steerable wing gear. Each main gear has four wheels per
truck in tandem pairs. The main gear trucks must be tilted and centered to allow
retraction into the wheel wells.
Hydraulic power for nose and body gear retraction and extension is supplied by
hydraulic system 1. Power to retract and extend the wing gear is provided by
hydraulic system 4. An alternate extension system is also provided.
The normal brake system is powered by hydraulic system 4. The alternate brake
system is powered by the hydraulic systems 1 or 2. Pressure-operated selector
valves provide automatic brake source selection. Antiskid protection is provided
with both systems, but the autobrake system is available only through the normal
system.
A brake temperature monitor system displays each brake temperature on the
GEAR synoptic display.
Air/Ground Sensing System
In flight and ground operation of various airplane systems are controlled by the
air/ground sensing system and a nose gear extension sensing system.
All four main gear tilt as the airplane lifts off the runway. When a combination of
main gear tilt sensors indicate the gear are tilted (air mode) or not tilted (ground
　
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