systems: flight controls Flashcards
wheel brakes
hydraulically activated
brake reservoirs
master cylinder
brake cylinder
left and right brake systems are separate
pilot’s brake lines pass through copilot’s
parking brake
switch in center console of cockpit
includes a parking brake valve
aircraft compostion
composite-fiber reinforced polymer (CFRP)
glass-fiber reinforced polymer (GFRP)
these are composite materials
pros: light, flexible, malleable
cons: subject to heat constraints & lightning damage
how plane cools down & resists lightning
painted white
structural temperature indicator on landing gear doors… should be all red
dissipating electrode in elevator, connected to all metals onboard
ailerons
differential ailerons
attached with 4 hinges secured by roll pin
control push rods
elevator
T tail configuration
attached with 5 hinges
actuated with control push rods
variable elevator backdrop system
variable elevator backdrop
electrically operated actuator limits elevator UP travel to 13 deg
normal operation allows 15.5 deg
automatically engages when one or both engines in reduced to 20% power or less AND flaps are set to LDG
servo rewinds actuator
rudder
attached with two hinges
steel cables connect pedals to rudder
flap types
inner flap is split (generates more lift than plain)
outer flap is plain (creates a lot of wake)
both types offer significant drag
flap positions
UP (0 deg)
APP (20 deg)
LDG (42 deg)
driven by electric motor
trim
elevator and rudder use anti servo trim tabs and actuated through cables
aileron trim tab adjustable on the ground
anti servo tabs…
increase angle of attack
results in more effective control and better stability
gurney flap
white strips just forward of the rudder
disrupts airflow over the rudder to smooth the airflow that strikes rudder when it is deflected
