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14.TOC.0.2 D6-30151-425
Landing Gear -
Table of Contents
Brake Source Selection Diagram. . . . . . . . . . . . . . . . . . . . . 14.20.9
EICASMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.30.1
Landing Gear EICASMessages . . . . . . . . . . . . . . . . . . . . . . . . 14.30.1
EICAS AlertMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.30.1
EICASMemoMessages . . . . . . . . . . . . . . . . . . . . . . . . . . . 14.30.2
October 1, 2000
747 Operations Manual
Landing Gear Chapter 14
Controls and Indicators Section 10
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.10.1
Landing Gear Panel
1 Landing Gear Lever
UP – landing gear retracts.
OFF - landing gear hydraulic system depressurized.
DN – landing gear extends.
2 Landing Gear Lever LOCK Override (OVRD) switch
Push –releases Landing Gear lever lock.
3 NOSE/BODY Alternate (ALTN) GEAR EXTEND switch
ALTN – nose/body landing gear extends by alternate extension system.
EXTENDED 320K-.82M
EXTEND 270K-.82M
RETRACT
270K-.82M
WING
UP
OFF
DN
OVRD
LOCK
ALTN
NOSE/BODY
EXTEND
ALTN GEAR
ALTN
CENTER PANEL
1
2
3
4
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
14.10.2 D6-30151-425
Landing Gear -
Controls and Indicators
4 WING Alternate (ALTN) GEAR EXTEND switch
ALTN – wing landing gear extends by alternate extension system.
Nose Wheel Steering Tiller
1 Nose Wheel Steering Tiller
Rotate –
• turns nose wheels up to 70 degrees in either direction
• overrides rudder pedal steering
2 Tiller Position Indicator
Shows tiller displacement from straight–ahead, neutral position.
LEFT AND RIGHT SIDEWALLS
2
1
December 01, 1999
747 Operations Manual
Landing Gear -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.10.3
Brake System
Rudder/Brake Pedals
1 Rudder/Brake Pedals
Push full pedal –
• turns nose wheel up to 7 degrees in either direction
• does not activate body gear steering
Push top of pedals – actuates wheel brakes.
Refer to Chapter 9, Flight Controls for the description of rudder operation.
Autobrakes Selector
1
AISLE STAND
DISARM
OFF
MAX
AUTO
RTO
1
2
3
4
AUTOBRAKES
1
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
14.10.4 D6-30151-425
Landing Gear -
Controls and Indicators
1 AUTOBRAKE Selector
OFF - deactivates and resets system.
DISARM -
• disengages autobrakes
• releases brake pressure
1, 2, 3, 4, MAX AUTO -
• increasing autobrakes deceleration rates
• brakes apply at touchdown
RTO -
• rejected takeoff braking
• applies maximum brake pressure when thrust levers retarded to idle above
85 knots
Parking Brake Lever
1 Parking Brake Lever
Pull – sets parking brake when both brake pedals simultaneously depressed.
Releases when both brake pedals simultaneously depressed.
PULL
BRAKE
PARK
1
CONTROL STAND
December 01, 1999
747 Operations Manual
Landing Gear -
Controls and Indicators
Copyright © The Boeing Company. See title page for details.
D6-30151-425 14.10.5
Brake Accumulator Pressure Indicator
1 BRAKE SOURCE Light
Illuminated (amber) – active brake hydraulic sources (hydraulic systems 4, 1, and
2) have low pressure.
2 BRAKE ACCUMULATOR PRESSURE Indicator
Indicates brake accumulator pressure.
ACCUMULATOR
NORMAL BRAKE
3
PSI X 1000 SOURCE
BRAKE
2 1
4
0
HYD
BRAKE PRESS
1 2
CAPTAIN’S PANEL
December 01, 1999
747 Operations Manual
Copyright © The Boeing Company. See title page for details.
14.10.6 D6-30151-425
Landing Gear -
Controls and Indicators
Landing Gear System Indications
Landing Gear Position Indications
1 Gear Position Indication (Normal Display)
DOWN (green) – all landing gear down and locked.
Crosshatched (white) – one or more landing gear in transit.
UP (white) – all landing gear up and locked (blanks after 10 seconds).
Empty box (white) – all landing gear position indicators inoperative.
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