Flight Controls Flashcards
Which hydraulic system(s) can power all primary flight controls?
System A and System B
What are the secondary flight controls?
Trailing Edge Flaps, Leading Edge Devices (Flaps/Slats), Spoilers (Flight/Ground)
The Trailing Edge Flaps and Leading Edge Devices are normally powered by system
B
How does placing a FLT CONTROL switch to STBY RUD affect the flight control panel lights?
STBY RUD ON light, Arms the LOW PRESSURE light
How would a single channel failure of the Speed Trim system be indicated
SPEED TRIM FAIL light on during Master caution recall
Which system(s) help in identifying and controlling stalls?
Yaw Damper, Autoslat, Elevator Feel Shift, Speed Trim System, Stick Shaker, SMYD
What does the SMYD computers use to determine when a stall warning is necessary?
Angle of Attack, ADIRU inputs, A/Ice Controls, Wing Config, Thrust, FMC output, Mach
How would a single channel failure of the Mach Trim system be indicated?
During Master Caution Recall: MACH TRIM FAIL (amber) light
Can the Speed Trim System be overridden? If so, how?
Yes: - Control Wheel Trim Switches, manual rotation of the Stabilizer Trim Wheel, engage AP
What is the purpose of the stall warning “Stick Shaker”
Warning of Impending Stall
What is require to activate the Main Yaw Damper?
Hyd System B pressure, B FLT CONTROL switch in the ON, and SMYD computers providing continuous system monitoring
How are the Rudders, Ailerons, and Elevators operated in Manual Reversion?
Ailerons and elevators are operated manually via cables, No cables to rudder ran by standby hydraulics
What would cause the Speed Brake lever to automatically stow after deployment on landing or RTO?
Either thrust lever advanced
How is roll controlled with jammed spoilers?
Captains’s control wheel provides roll control using the ailerons
How is roll controlled with jammed ailerons?
F/O control wheel actuates the Aileron Transfer Mechanism, provides roll control using the Flight Spoilers
How is the horizontal Stabilizer Trim normally powered? Is there an alternative way?
Single electric trim motor. Stab Trim Switches on the control wheel or autopilot trim or stabilizer trim wheels
Through the use of the Alternate Flaps UP/DOWN switch, how are the Leading Edge Devices and Trailing Edge Flaps operated?
LEDs hydraulic, Single tap down of ALT flap switch, Trailing edge flaps electrical, continuous hold of switch until required position
What is the purpose of the flap load relief system?
Protects the trailing edge flaps from excessive air loads @ flaps 10 or greater. Retracts the TE flaps one stage.
What protections are provided during an alternate flap extension?
None
What is the purpose of the LE FLAPS TRANSIT light on the main panel, below the Trailing Edge Flaps indicator?
Indicates any LED in transit or LED is not in the correct position with respect to the TE flaps (disagreement),
OR
An LED uncommanded motion, or during alternate flap extension until all LE devices are fully extended and the TE flaps reach flaps 10(flaps 15 SFP Option)
How is the Standby Yaw Damper activated
FLT CONTROL switch A+B to STBY RUD. YAW DAMPER switch must be reset to ON.
When will the SPEEDBRAKES EXTENDED light illuminate?
Flight: SPEED BRAKE lever beyond the ARMED position, and: TE Flaps greater than 10 or RA less than 800’
GND: Lever Down, Spoiler not Stowed
What is the light logic on the Leading Edge Devices annunciator panel on the Aft Overhead?
Out: stowed
Amber: transit
Green: in commanded position
How many degrees of control wheel displacement initiates spoiler deflection?
When the control wheel is displaced more than approximately 10 degrees
