Landing Gear and Brakes Flashcards
(38 cards)
How is landing gear controlled?
Electrically controlled, hydraulically
actuated, and electrically sequenced
What does the white light indicate in
gear handle?
Disagreement between landing gear
handle and the gear
What’s the meaning of magenta gear
indication on flight control synoptic
page?
Gear in transit
What functions are performed from
Landing Gear Control Maintenance
Panel (LGCMP)?
Used to open/close gear doors, retract or
extend the gear when jacked, and change
WOW status
What’s the purpose of the landing
gear LOCK RELEASE button?
It allows landing gear handle to be placed
in UP position regardless of WOW mode
What’s the normal source of
hydraulics for opening and closing
gear doors on the ground?
Aux pump (in the absence of hydraulic
pressure from left system) through
LGCMP
What’s the caution associated with
gear doors once they’re opened for
preflight?
Always pin the doors open when
movement is not desired
After opening the gear doors for
preflight, what must be accomplished
to put the airplane back into “ready
for flight mode?”
Close all gear doors and select Normal on
LGCMP; otherwise, plane will remain in
MX mode and gear will not retract on
departure.
What’s the location of the nitrogen
bottles used for emergency landing
gear extension?
There are two (2) bottles: one located on
each side of the nose wheel well
What’s the pressure on a fully
serviced emergency landing gear
extension bottle?
3,000 psi at 70°F/21°C; enough for only
one extension of landing gear
What happens to uplocks when left
hydraulic system pressure is applied
during gear retraction?
They move to correct position
What happens if an uplock is found in
wrong position during preflight and
aux pump pressure is applied?
The hook snaps to correct position: there’s
no preflight requirement to make sure
they’re open.
What happens if you takeoff with nose
and main gear downlock safety pins
installed?
Gear will not retract
What’s the purpose of disconnecting
torque link from NWS unit during
towing?
It prevents damage to NWS unit from over
travel. With steering unit torque links
disconnected, nose wheels are free to
rotate 360°
Describe WOW system.
Two proximity sensors are installed on
each landing gear and provide WOW
indications.
How many landing gear dump valves
are there?
Two: one for nose and one for mains
After performing an emergency
extension, Nose Gear and Main Gear
illuminates in blue inside Dump Valve
switches. What does this indicate?
Dump valve movement from hydraulics to pneumatic position.
What happens when Dump Valve
switches are pressed?
Dump valves are electrically placed in
hydraulic position and blue switch labels
change to white
Describe what happens when EMER
LDG GEAR handle is pulled?
Emergency air release valve opens and
releases compressed nitrogen into landing
gear extension system
What happens when EMER LDG
GEAR handle is returned to stowed
position?
Nitrogen pressure releases from actuators
and exhausts overboard through vent on
right side of nose wheel well adjacent to
NLG doors
What’s the position of landing gear
doors following an emergency
extension?
Open
Describe sources of hydraulics for
normal braking.
Inboard brakes are powered by hydraulics
from left system, PTU or aux system.
Without source of hydraulics, inboard
accumulator is available for use through
toe brakes as well as parking brake.
Outboard brakes are powered by
hydraulics from right hydraulic system.
Without source of hydraulics, outboard
accumulator is available for use through
toe brakes as well as parking brake.
Describe sources of hydraulics for
parking brake.
Parking brake uses pressure from left and
right hydraulic systems (i.e., left system
for inboard and right system for outboard).
In the absence of left or right system
pressure, it uses accumulator pressure
which is charged from left and right
hydraulic systems. Important note: if you
select AUX pump to ON during ground
operations without engines running, only
the left (inboard) parking brake
accumulator is charged.
What happens if both pilots are
providing brake input?
Greater input wins
