Flight Controls Flashcards
Which hydraulic system(s) can power all primary flight controls?
Both A and B.
STBY - just rudder and LE devices
What are the secondary flight controls?
High lift devices - trailing edge flaps, LE devices (flaps & LE slats)
Drag devices - speedbrakes
Roll augmentation - spoilers
The Trailing Edge Flaps and Leading Edge Devices are normally powered by B?
Yes, the Trailing Edge Flaps and LEDs are powered by Hydraulic System B
How does placing a FLT CONTROL switch to STBY RUD affect the flight control panel lights
STBY RUD ON light illuminates
Arms STBY HYD LOW PRESSURE light
Respective flight control light extinguishes
If B system, will illuminate
How would a single channel failure of the Speed Trim system be indicated?
SPEED TRIM FAIL light during recall only
STS uses two FCCs (dual channel) - so you won’t get an indication unless both
FCCs are incapable of providing the STS function
Which system(s) help in identifying and controlling stalls?
Yaw Damper
Elevator Feel Shift (EFS) Module Speed Trim System
Stall Management Yaw Damp Computer (SMYDs) calculate PLIs Also Autoslats
What do the SMYD computers use to determine when a stall warning is necessary?
AOA Sensor outputs ADIRU outputs anti-ice controls Wing configurations air/ground sensing thrust FMC outputs Mach compensation
How would a single channel failure of the Mach Trim system be indicated?
MACH TRIM FAIL during recall only
Can the Speed Trim System be overridden? If so, how?
Yes, by...use of electric trim or manual rotation of either Stabilizer Trim Wheel STS works when... - Airborne for 10+ seconds - No manual trim prior 5 seconds - Senses a need for trim - A/P disengaged
What is the purpose of the stall warning “Stick Shaker”?
Designed to alert the pilots before a stall develops.
What is required to activate the Main Yaw Damper?
Hydraulic System B pressure, the B FLT CONTROL switch in the ON (guarded) position, and no fault detected by SMYD computers
How are the Rudders, Ailerons, and Elevators operated in Manual Reversion?
Manually
Ailerons and elevator - mechanically with cables
Rudder - STBY hydraulic system (NOT CABLES)
What would cause the Speed Brake lever to automatically stow after deployment on landing or RTO?
Either thrust lever advancing (think touch and go)
How is roll controlled with jammed spoilers? Jammed ailerons?
Ailerons jammed = FO side only controls roll with SPOILERS
Spoilers jammed = Captain side only controls roll with AILERONS
How is the horizontal Stabilizer Trim normally powered
Is there an alternative way?? a single electric trim motor (either with switch or autopilot) alternative way - manually rotating the trim wheel
Through the use of the Alternate Flaps UP/DOWN switch, how are the Leading Edge Devices and Trailing Edge Flaps operated?
LE devices are hydraulic using standby system and cannot be retracted
Trailing edge flaps revert to electrical operation (very slow)
What is the purpose of the flap load relief system?
protects the trailing edge flaps from excessive loads/overspeed
What protections are provided during an alternate flap extension?
No protections - you lose asymmetry and skew protections + more
What is the purpose of the LE FLAPS TRANSIT light on the main panel, below the Trailing Edge Flaps indicator?
LE FLAPS TRANSIT - in transit or disagree with scheduled position AND during alternate flaps extension until LE devices are fully extended and TE flaps reach 15
How is the Standby Yaw Damper activated?
Must be in manual reversion - both FLT CONTROL switches positioned to STBY RUD
YAW DAMPER switch reset to ON
When will the SPEEDBRAKES EXTENDED light illuminate?
in flight - SPEED BRAKE lever beyond the ARMED position with TE Flaps extended more than Flaps 10 OR radio altitude less than 800 ft
on the ground - Speed brake panels still out with the handle stowed (disagree)
NOTE: On the ground, the SPEEDBRAKES EXTENDED light does not illuminate when Hydraulic System A pressure is less than 750 psi.
What is the light logic on the Leading Edge Devices annunciator panel on the Aft Overhead?
Position status of individual LE flaps/slats
GREEN = position
YELLOW = in transit
EXTINGUISHED = retracted
