Flight Controls/Stall Protection Flashcards
All flight controls are ________ except for the ______
Fly-by-wire, Ailerons
What is the E-PBIT?
Electrical Power-Up Built-In Test
Tests the electrical components of the fly-by-wire system.
When does the E-PBIT start?
Automatically when the airplane is powered up (AC established).
How long does the E-PBIT take?
3 minutes
What can interrupt the E-PBIT?
- Any hydraulic pump turned ON
- Flight Control Mode Buttons are cycled
- AC power is interrupted
How long is the E-PBIT test good for?
50 hours
When should you run an E-PBIT?
First flight of the day
What is the H-PBIT?
Hydraulic Power-Up Built-In Test
Tests the hydraulic components of the fly-by-wire system.
When does the H-PBIT occur?
Automatically when all three hydraulic systems are pressurized.
How long does the H-PBIT take?
1 minute
What can interrupt the H-PBIT?
Any flight control surface moved
How long is the H-PBIT good for?
50 hours
What are the two modes the flight controls can operate in?
Normal and Direct
What occurs in NORMAL mode for the flight controls?
Flight Control Modules (FCMs) are used to provide higher level functions.
What are some of the higher level functions of the elevator?
- AOA limiting (Limits AOA the closer to stall)
- Thrust Compensation (Helps prevent pitching moments with thrust change)
- Elevator Control Laws Scheduling with Airspeed (less deflection at higher speeds)
- Configuration Change Compensation (More stable in pitch when using speedbrakes)
What are some of the higher level functions of the rudder?
- Rudder Flight Authority
- Yaw Damper and Turn Coordination via AFCS
What are some of the higher level functions of the spoilers?
- Roll spoiler scheduling with airspeed and speedbrake deployment (more precise low-speed roll control)
- Ground spoilers automatic deployment on landing and stowed if thrust added for go-around
What is the logic behind a movement of a control surface starting at the yoke?
Control –> Actuator Control Electronics (ACE) –> Flight Control Module (FCM) –> ACE –> Power Control Unit (PCU)
How many multi-function spoilers and ground spoilers?
3 MF spoilers per wing and 2 ground spoilers per wing
How is pitch trim accomplished?
By moving the horizontal stabilizer
When will the speedbrakes automatically retract?
- Airspeed lower than 180 knots
- Thrust 70 degrees
- Flaps greater than 1
What is the pitch trim priority?
- Back Up Switches
- Captain
- First Officer
- Autopilot
