Flight Controls Flashcards
How are the primary flight controls controlled and actuated?
- Electronically controlled by the fly-by-wire (FBW) system
- Hydraulically actuated by power control units (PCUs)
What are the FBW normal mode tactile pitch protections?
- Progressive increase in required sidestick force as sidestick deflection is increased
- Soft stop in the pitch axis at the operational flight envelope
- Hard stop at the sidestick travel limit in the pitch axis at the airplane structural limit
- Stick shaker
What is the normal mode nose-up pitch attitude limit in flight?
30º
What is the normal mode nose-up pitch attitude limit during takeoff?
17.5⁰ to assist in preventing a tail strike on takeoff
What is the normal mode nose-down pitch attitude limit in flight?
20º
Is the airplane aerodynamically stalled, in the normal mode, while maintaining VAOA HARD (Hard Stop)?
No; In smooth air, the hard stop maintains an AOA value for activating the stick shaker
Note: Environmental factors such as turbulence or gusts can cause airspeed to decrease below VAOA HARD. In this case, the airplane may stall in FBW normal mode momentarily as the airplane pitch is adjusted to regain VAOA HARD.
In FBW normal mode, what is the maximum bank angle limit?
80º
Passed what bank angle in the normal mode will FBW return to?
30°
To what degree is pitch compensation in turns provided?
33°
What are the 3 FBW direct modes?
- PFCC (primary flight control computer) direct
- REU (remote electronic unit) direct
- AFCU (alternate flight control unit) direct
What causes PFCC direct mode?
Loss on input to the PFCC; IRS, ADC etc.
What causes REU direct mode?
Loss of all three PFCC
What causes AFCU direct mode?
Loss of all REU to a single flight control surface
What causes AFCU direct mode?
Is the autopilot available in FBW direct modes?
No
How do you regain FBW normal mode after a complete PFCC failure?
All PFCCs must be reset by pressing the PBAs to OFF then ON
Note: this is not a memorized event. There is a checklist for this!
What will occur if the rudder or stab trim is outside the allowable takeoff range during thrust lever advancement?
- Red CONFIG RUDDER TRIM or CONFIG STAB TRIM CAS will appear
- “No Takeoff” aural alert
What functions does the AP/PTY switch on the sidestick provide when pressed momentarily?
- Disconnects the autopilot if engaged
- Selects sidestick momentary priority if the autopilot is not engaged
What is the function of the ALTN FLAP PBA?
Will extend the slats and flaps to position 2
Note: The slats and flaps begin movement only if the airspeed is at or below 200kt. This control is a work around for a failed flap handle. There is only an alternate control and not an alternate operating system.
Will failure of the flaps prevent operation of the slats?
No; the slats and flaps have independent dual-motor power drive units (PDUs)
What is the purpose of the FLAPS OFF PBA on the TAWS panel?
Used to cancel the flap aural warning if the flaps are not set at 4 with the gear down, airspeed below 159kt, and altitude below 245ft (75m) for landing
How many pairs of spoiler panels are located on each wing?
- 3 multi-functional spoilers (MFS)
- 1 ground spoiler (GS)
How are the spoilers controlled and actuated?
- Electrically controlled
- Hydraulically actuated
What do the MFS panels provide?
- Roll
- Drag
- Ground lift dumping
Which hydraulic system powers the ground spoilers?
HYD system 1
What is the activation logic for the ground spoilers?
- Either MLG is weight-on-wheels, and
- Either MLG wheel speed is greater than 16kt, and one of the following_
* RAD ALT below 7ft, or
* Both MLG are weight-on-wheels and airplane pitch angle less than 2*º
When in AFCU direct mode, what spoilers are available?
None
What happens if both sidesticks are operated simultaneously?
- Red DUAL annunciation is shown on both PFDs
- “DUAL INPUT” aural warning message
- The total summed input signal of both sidesticks is limited to the maximum deflection of a singlesidestick
What happens when the AP/PTY pushbutton is pressed and held?
- The autopilot, if engaged, disconnects
- The opposite sidestick and its pitch trim switch are deactivated
- The PTY legend on the onside glareshield SIDESTICK guarded PBA flashes
- A red arrow illuminates on the opposite SIDESTICK guarded PBA
- A “PRIORITY LEFT” or “PRIORITY RIGHT” aural message is annunciated once
Note: when both AP/PTY pushbuttons are pressed, the last one pressed has priority. If the AP/PTY pushbuttons are pressed simultaneously, the left sidestick has priority
What happens when the guarded SIDESTICK PBA on the glareshield is pressed?
- The autopilot, if engaged, does not disconnect
- The PTY legend on the onside glareshield SIDESTICK PBA remains on without flashing
- The AP/PTY pushbutton on the disabled sidestick has no effect
Note: Pressing the guarded SIDESTICK PBA on the disabled side transfers sidestick priority
