Flight Controls Flashcards
Which hydraulic system(s) can power all primary flight controls?
Either hydraulic system A or B
Standby hydraulics only power
-Rudder
-Standby yaw damper
-LED extension
-Thrust reversers
What are the secondary flight controls?
High lift devices (flaps/slats)
Drag devices (speedbrakes)
Roll augmentation (spoilers)
Flaps and Slats are normally powered by? Alternate power source?
Hydraulic system B
Alternate power sources
TE flaps
–Electric motor
LEDs
–Standby hydraulics (extension), or
–PTU
—-Autoslats
—-LED retraction w/ low HYD sys B pressure
What happens when placing a FLT CONTROL switch to STBY RUD?
Activates standby hydraulic system
–STBY RUD ON illuminates
–Arms LOW QUANTITY (<50%) light
Opens standby rudder shutoff valve
Inhibits respective FLT CONTROL LOW PRESSURE light
Yaw damper disengages if system B
What is Speed Trim? What does it provide?
Speed stability system
Returns aircraft to a trimmed speed (using stabilizer trim)
High AOA stall protection
What are the significant conditions required for Speed Trim to operate?
A/P not engaged
Airborne +10 sec
Electric trim switch release +5 sec
Flaps extended, or gear retracted, or CAS < 226kts
*operates mostly during takeoff, climb, go-around
*low speed, weight, aft CG, high thrust
What are the indications of a Speed Trim System fault/failure?
SPEED TRIM FAIL (amber)
Speed trim has failed
Dual channel system, on RECALL then only a single channel has failed
Which system(s) help in identifying and controlling stalls?
Stall Management Yaw Damper (SMYD) computers
-Stick shaker
-Pitch Limit Indicators (PLIs)
-Yaw damper reduced
Speed Trim
-Trims stabilizer nose down
Elevator Feel Shit
-Increases control column forces
Yaw Damper
-Rudder movement reduced by SMYD
FMC BUFFET ALERT
What does the SMYD computer use to determine a stall warning is necessary?
AOA
ADIRUs
Anti-Ice position
Wing configuration
Thrust
FMC outputs
Mach compensation
Air/ground logic
What is Mach Trim? What does it provide?
Speed stability system
Compensation for nose down (tuck) tendencies at higher Mach
Also, additional nose-up elevator during low-speed maneuvering
What are the indications of a Mach Trim fault/failure?
MACH TRIM FAIL (amber)
Mach trim system has failed
Dual channel system, on RECALL then only a single channel has failed
How can Speed Trim System be overridden? Inhibited?
Overridden by
-Electric trim (5 seconds)
-Manual trim
Inhibited by
-A/P engaged
-Control column cutout switches activated
-A/P STAB TRIM CUTOUT switch to CUTOUT
-Bank > 40*
What is the purpose of the stall warning “stick shaker”?
Alert the pilot before a stall develops
What is required to activate the main yaw damper? Standby yaw damper?
Main Yaw Damper
-Hydraulic system B pressure
-FLT CONTROL switch B is ON (normal, guarded position)
-SMYD(s)
-Yaw Damper switch ON
Standby Yaw Damper
-Both FLT CONTROL switches to STBY RUD
-Standby hydraulic pressure
-Yaw Damper switch recycled to ON
What would cause the speedbrake to automatically stow after deployment on landing or an RTO?
Thrust lever advancement (either)