Flight Controls Flashcards
Flap extension Speeds
Flaps 1: 230 kts Flaps 2: 215 kts Flaps 3: 200 kts Flaps 4 or 5: 180 kts Flaps FULL: 165 kts
Which flight controls are fly-by-wire?
- Elevator
- Rudder
- Spoiler
What is Electric PBIT?
The Electric PBIT (Power-Up Built-In Test) tests the electrical components of the FBW (fly-by-wire) sytem.
- It is automatically performed when airplane is powered up (ac power established)
- Takes 3 minutes to complete
- Test is good for 50 hours
What actions will interrupt an Electric PBIT?
- Any hydraulic pump is turned on
- Flight control mode buttons are cycled
- AC Power is interrupted
What is Hydraulic PBIT?
The Hydraulic PBIT tests the hydraulic components of the FBW system. The HYDR PBIT is automatically performed when all three hydraulic systems are pressurized. It takes 1 minute to complete.
What actions will interrupt a Hydraulic PBIT?
Any flight control surface is moved.
What are the mode annunciations for the flight controls?
Normal, Direct, Fail
Normal mode annunciation of the flight controls?
The FCM’s (Flight Control Modules) provide high level functions susch as AOA limiting.
Direct mode annunciation of the flight controls?
The FCM is bypassed and high level functions are not available.
Fail annunciation of the flight controls?
Happens anytime the system is inoperative.
Hydraulic systems are not pressurized.
Primary Flight controls consist of:
Ailerons and multi function roll spoilers - roll axis
Elevators for pitch axis control
Rudder for yaw axis control
The secondary flight controls consist of:
Horizontal stabilizer
Flaps and slats
The multi-function spoiler(when used as speed brakes or ground spoilers)
Dedicated ground spoilers
How are the ailerons commanded?
By conventional control cables that run from each control wheel back to a pair of hydro-mechanical actuators
The primary flight control electronics include two complementary parts:
The primary actuator control electronics (P-ACE)
The Flight Control Module (FCM)
Normal Mode of Flight controls (Higher level functions)
Elevator control laws scheduling with airspeed
FCM knows how fast we are going and won’t allow the control surface to deflect enough to damage the flight control
Normal Mode of Flight controls (Higher level functions)
Auto thrust compensation with elevator
As the thrust levers move , the FCMs automatically adjust the elevator to compensate for the pitching moment in applying or removing thrust
Normal Mode of Flight controls (Higher level functions)
Angle of attack limiting with elevator offset
helps prevent over AOA on the elevator when approaching the stall
Normal Mode of Flight controls (Higher level functions)
Yaw damper and turn coordination
Deflects rudder to help maintain coordination in a turn
Normal Mode of Flight controls (Higher level functions)
Rudder airspeed gain scheduling and stroke limiting
Adjusts rudder deflection limit based on airspeed so that we don’t overstress the control surface. Will also help in low airspeed conditions as well to maintain controllability
Normal Mode of Flight controls (Higher level functions)
Roll spoiler scheduling with airspeed and speed brake deployment
When you go to roll the airplane it will deploy MF spoiler on low wing
Normal Mode of Flight controls (Higher level functions)
Configuration change compensation with horizontal stabilizer due to speed brakes actuation
Minimizes the pitch down when speed brakes are applied by adjusting the pitch of the horizontal stabilizer
What are the 3 different functions of the MF Spoilers ?
- Roll Spoilers (in flight)
- Speed Brakes (in flight)
- Ground Spoilers (on ground)
Sys 1 and Sys 2 cutout buttons do what?
They disable the the HS-ACE respective channel 1 or 2
Hydraulic system 2 powers what components?
Landing Gear Brake Inboard MF spoiler 5 Ground spoiler 1 Nose wheel steering Elevator inboard aileron inboard
How many Actuator Control electronics(ACE) and Flight Control Modules (FCM) are there?
4 FCMs 3 primary ACEs (P-ACE) 3 spoiler ACEs (S-ACE) 2 slat/flap ACEs (SF-ACE) 1 horizontal ACE (H-ACE
