14 - Landing Gear Flashcards
If hydraulic system 4 fails can parking brake be set, (if yes how)?
Yes
hydraulic system 1 or 2 is used
Can the Accumulator apply wheel brakes, (other than the parking brake)?
yes, but can not be used to stop the airplane
Boeing CBT
When does the BRAKE SOURCE light illuminate?
hydraulic pressure 1,2 and 4 low
What provides autobrake reference?
IRU selected by Captain on IRS Source Selector
The main gear trucks must be _______ to allow
retraction into the wheel wells
tilted and centered
Hydraulic power for nose and body gear retraction, extension, and steering is supplied by hydraulic system ___
Power to retract and extend the wing gear is
provided by hydraulic system ___
1
4
The normal brake system is powered by hydraulic system ___
The alternate brake system is powered by hydraulic system ____
4
1 or 2
Pressure-operated selector valves provide automatic brake source selection
Antiskid protection is provided with _______ ,
The autobrake system is available through _______
normal and alternate brake systems
only the normal system
Air/Ground Sensing System
air mode -
ground mode -
stall warning and nose gear steering systems-
gear tilted
gear not tilted
nose gear extension
On the ground, a _______ prevents movement of the gear lever from OFF to UP
Can be manually overridden by ______
In flight, the lever lock is released when ______
automatic lever lock
pushing and holding the Landing Gear Lever
Lock Override switch
the main gear are tilted and the body gear is centered
All four main gear _______ as the airplane lifts off the runway
During landing, ______ brings the gear to a level position
hydraulically tilt
ground load
Each wing gear has ______ gear door(s)
Each body gear has ______ gear door(s)
The nose gear has ______ gear door(s)
one hydraulically actuated and one mechanically actuated
one hydraulically actuated and two mechanically
actuated
two hydraulically actuated and two
mechanically actuated gear doors
When the Landing Gear lever is moved to UP, ________, ________, and the landing gear begin to retract
landing gear doors open
automatic braking occurs
After retraction, the main gear are held in the up position by ______
The nose gear is ______ in the up position
EICAS landing gear position indication changes to UP for _____ and then blanks.
Positioning the Landing Gear lever to OFF _______
mechanical uplocks
mechanically locked
10 seconds
depressurizes the landing gear system
When the Landing Gear lever is moved to DN, _______ (6)
- gear doors open
- gear are unlocked
- gear are hydraulically powered to the down and locked position
- downlocks are powered to the locked position
- gear doors close (all hydraulically actuated doors)
- main gear trucks hydraulically tilt to the flight position
Pushing the Alternate Gear Extend switches:
_______ (2)
What extends the gear?
_____ pull the downlocks into the locked position.
All gear doors ________ for the affected gear after alternate extension
- electrically releases gear uplocks and gear door latches (allowing gear to free fall)
gravity and airloads
springs
remain open
Tillers can turn the nose wheels up to ____
degrees
Rudder pedals can turn the nose wheels up to ____ degrees
______ inputs override ______ inputs
70 degrees
7 degrees
Tiller / rudder pedal
Body gear steering operates when the nose wheel steering angle exceeds ____
Body gear steering is activated when ground speed decreases through ____
As speed increases through ____ the body gear is hydraulically centered and body gear steering is deactivated
20 degrees
15 knots
20 knots
Normal brake hydraulic system is powered by hydraulic system ___
Alternate brake hydraulic system is powered by
hydraulic system ___ (if low),
hydraulic system ___
4
1
2
What causes the brake source light to illuminate?
The brake accumulator provides _______
loss of hydraulic systems 4, 1, and 2
parking brake application
Antiskid protection is provided in which brake systems?
Touchdown and hydroplaning protection is provided using ____
Locked wheel protection is provided using ____
normal and alternate
inertial ground speed
comparison with other wheel speeds
The normal brake hydraulic system provides ______ (type of antiskid)
When a wheel speed sensor detects a skid _____
The alternate brake hydraulic system provides
______ (type of antiskid)
each main gear wheel with individual antiskid protection
antiskid valve reduces brake pressure until skidding stops
antiskid protection to lateral wheel pairs (forward and/or aft pair on each truck) rather than to individual wheels
A brake torque sensor is provided at each wheel. What happens when excessive torque is detected?
Is there any difference if the alternate brake system is used?
a signal is sent to the antiskid valve to release brake pressure to that wheel
the signal is sent to the alternate antiskid valve
and brake pressure is released on a laterally paired wheel basis
The autobrake system provides braking at preselected _________ for landing and full pressure for rejected takeoff
The autobrake system operates only when the _____ and _____ systems are functioning
deceleration rates
normal brake and antiskid
The RTO autobrake setting commands maximum braking pressure if: (3)
- the airplane is on the ground
- groundspeed is above 85 knots, and
- all thrust levers are closed
On dry runways, the maximum autobrake deceleration rate in the landing mode is ______ that produced by full pedal braking
less than
After landing, autobrake application begins when: (3)
- ground mode is sensed,
- all thrust levers are closed, and
- the wheels have spun up
(To maintain the selected airplane deceleration rate, autobrake pressure is reduced as other controls, such as thrust reversers and spoilers, contribute to total deceleration. The system provides braking to a complete stop or until it is disarmed)
Autobrake system disarms immediately if any of the following occur: (7)
- pedal braking applied
- any thrust lever advanced after landing
- Speedbrake lever moved to DOWN detent after speedbrakes have deployed on the ground
- DISARM or OFF position selected on Autobrakes selector
- autobrake fault
- normal antiskid system fault
- loss of normal brake hydraulic pressure
When the autobrake system disarms after landing, the Autobrakes selector moves to _____
When the autobrake system disarms during takeoff, the Autobrakes selector moves to _____
DISARM
remains in RTO position, but moves to OFF after takeoff
The parking brake can be set with ______
normal (4), alternate (1/2) brake hydraulic system or the brake accumulator
The brake accumulator is pressurized by ____
Accumulator pressure is shown ____
The accumulator (__is/is not__) designed to stop the aircraft
hydraulic system 4
on the brake accumulator pressure indicator
is not
Do gear doors retract/indicate position when gear is manually extended?
Yes/No - gear door indications are inhibited (lever off to depressurize gear, manual extension activates electric motors to unlock gear and gear doors and gear free falls)
BRAKE LIMITER EICAS message indicates ______
two or more brake limiters have failed on one truck
