Flight Controls Flashcards
Which hydraulic system(s) can power all primary flight controls?
The Primary Flight Controls are powered by redundant hydraulic sources, System A and System B. Either hydraulic system can operate
all of the Primary Flight Controls.
What are the secondary flight controls?
The secondary flight controls include high lift devices, drag devices, and roll augmentation.
The Trailing Edge Flaps and Leading Edge Devices are normally powered by which system?
The Trailing Edge Flaps and LEDs are
powered by Hydraulic System B.
What happens when placing a FLT CONTROL switch to STBY RUD?
- activates the Standby Hydraulic System
- opens the Standby Rudder Shutoff Valve (allowing Standby Hydraulic System pressure to the Standby Rudder PCU).
When the Standby Rudder Shutoff Valve reaches the open position, a limit switch extinguishes the respective Flight Control LOW PRESSURE light.
How are the Rudder, Ailerons, and Elevators operated in manual reversion?
Airlerons an Elevators - Manually via cables
The rudder may be operated by the Standby Hydraulic System if System A and System B pressure is not available.
NOTE: There are no provisions for manual operation of the rudder
How is roll controlled with jammed spoilers?
If the Spoiler System is jammed, force applied to the Captain’s control wheel actuates the Aileron Transfer Mechanism and provides roll
control using the ailerons. The spoilers and the First Officer’s control wheel are inoperative.
How is roll controlled with jammed ailerons?
Force applied to the first officer’s control wheel actuates the Aileron Transfer Mechanism and provide control using Flight Spoilers.
The aileron and Captain’s control wheel are inoperative.
How would a single channel failure of the Mach Trim systems be indicated?
The MACH TRIM FAIL (amber) light, located on the Flight Control Panel, when illuminated:
- during Master Caution Recall indicates failure of a single FCC channel. The light extinguishes when the Master Caution System is reset.
How is the horizontal Stabilizer Trim normally operated?
Is there an alternative way?
The horizontal stabilizer is positioned by a single electric trim motor controlled through either the Stab Trim Switches on the control wheel or autopilot trim.
The stabilizer may also be positioned by manually rotating the Stabilizer Trim Wheels located on each side of the center
pedestal.
Can the Speed Trim System be overridden? If so, how?
Speed Trim may be overridden by:
- actuation of the Control Wheel Trim Switches (inhibits further Speed Trim
operation for 5 seconds)
- manual rotation of either Stabilizer Trim Wheel
Which system(s) help in identifying and controlling stalls?
ASS YES
The stall warning “Stick Shaker” consists of two eccentric weight motors, one on each control
column. They are designed to alert the pilots before a stall develops. The warning is given by vibrating both control columns.
2 SMYD
Yaw Damper
Auto Slats
ELEV Feel Shift
Speed Trim System
Stick Shaker
What factors are used by the Stall Management Yaw Damper computers to determine when a stall warning is required?
WTF - AAAA
Two independent, identical SMYD computers determine when stall warning is required based upon:
• Angle of Attack Sensor outputs
• ADIRU outputs
• anti-ice controls
• wing configurations
• air/ground sensing
• thrust
• FMC outputs
• Mach compensation
What is required to activate the Main Yaw Damper?
For normal operation, the Main Yaw Damper requires:
- Hydraulic System B pressure
- the B FLT CONTROL switch in the ON (guarded) position, and
- the SMYD computers to provide continuous system monitoring
When will the SPEEDBRAKES EXTENDED (amber) light illuminate?
When illuminated, it provides an
indication of spoiler operation:
- in flight, with the SPEED BRAKE lever beyond the ARMED position, and:
• TE Flaps extended more than Flaps 10, or
• radio altitude less than 800 ft - on the ground, with the SPEED BRAKE lever in the DOWN detent and hydraulic pressure is sensed by a pressure switch (750 psi) in the Ground Spoiler Interlock Valve (ground spoilers may not be stowed).
What would cause the Speed Brake lever to automatically stow after deployment on landing or RTO?
After an RTO or landing, if either thrust lever is advanced, the SPEED BRAKE lever automatically moves to the DOWN detent and all spoiler panels retract.
