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3. 4
DOOR
DOOR
220 220 1. 7 0. 0
215 220
215
55 220
187 187
1 2 3 4
5 6 7 8
221
9 10
MULTIFUNCTION DISPLAY
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2
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5
PRELIMINARY
787 Flight Crew Operations Manual
Landing Gear -
Controls and Indicators
14.10.6 Boeing Proprietary
BRAKE – indicates brake deactivation on the associated wheel.
ASKID – indicates antiskid fault on the associated wheel.
Tire pressure is indicated within each individual gear indication:
• white – normal pressure
• amber – low pressure. (value = TBD)
4 Fault Indication (amber)
5 Tire Pressure Indication (amber)
787 Flight Crew Operations Manual
Landing Gear Chapter 14
System Description Section 20
Boeing Proprietary 14.20.1
14.20 Landing Gear-System Description Air/Ground Sensing System
In–flight and ground operation of various airplane systems are controlled by the
air/ground sensing system.
The system receives air/ground logic signals from sensors located on each main
landing gear beam. These signals are used to configure the airplane systems to the
appropriate air or ground status.
Landing Gear Operation
The landing gear are normally controlled by the landing gear lever. On the ground,
the lever is held in the DN position by an automatic lever lock. The lever lock can
be manually overridden by pushing and holding the landing gear lever LOCK
OVERRIDE switch. In flight, the lever lock is automatically released through
air/ground sensing.
Landing Gear Retraction
When the landing gear lever is moved to UP, the landing gear begins to retract.
The landing gear doors open and the main gear wheels tilt to the retract position.
The EICAS landing gear position indication display changes from a green DOWN
indication to a white crosshatch in–transit indication as the landing gear retract
into the wheel wells. After retraction, the landing gear are held up by uplocks. The
EICAS landing gear position indication changes to UP for 10 seconds and then
blanks. With the landing gear retracted and all doors closed, the landing gear
hydraulic system is automatically depressurized.
If any gear is not up and locked up after the normal transit time, the EICAS caution
message GEAR DISAGREE is displayed. The EICAS gear position indication
changes to the expanded non–normal format, with the affected gear displayed as
in–transit or down, if the gear never unlocked from the down position. The EICAS
advisory message GEAR DOOR is displayed if any hydraulically actuated door is
not closed after normal transit time.
Landing Gear Extension
When the landing gear lever is moved to DN, the landing gear doors open, the gear
are unlocked, and the in–transit indication is displayed on the EICAS landing gear
position indication.
787 Flight Crew Operations Manual
Landing Gear -
System Description
14.20.2 Boeing Proprietary
The gear free–fall without hydraulic power to the down and locked position. The
downlocks are powered to the locked position, all hydraulically actuated gear
doors close, and the main gear trucks hydraulically tilt to the flight position. When
all gear are down and locked, the EICAS gear position indication displays
DOWN.
The EICAS caution message GEAR DISAGREE is displayed if any gear is not
locked down (side and drag brace on the same main gear not locked, or nose gear
drag brace not locked) after the normal transit time. The EICAS gear position
indication changes to the expanded non–normal format, with the affected gear
displayed as in transit (or UP if the gear never unlocked from the up position).
If only one brace on a main gear is locked (either drag or side brace not locked)
after the normal transit time, the EICAS caution message MAIN GEAR DRAG
BRACE L, R or MAIN GEAR SIDE BRACE L, R is displayed for the affected
gear. The EICAS gear position indication changes to the expanded non–normal
format, with the affected gear displayed as in transit. The EICAS advisory
message GEAR DOOR displays if any hydraulically actuated door is not closed
after the normal transit time.
Landing Gear Alternate Extension
The alternate landing gear extension system uses a dedicated DC powered electric
hydraulic pump and center hydraulic system fluid to extend the landing gear.
Selecting DOWN on the ALTERNATE GEAR switch releases all door and gear
uplocks. The landing gear free–fall to the down and locked position. The landing
gear lever position has no effect on landing gear alternate extension.
The EICAS landing gear position indication displays the expanded gear position
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787机组操作手册Flight Crew Operations Manual 3(107)
