Flight Control Laws Flashcards
What protection do you have in Normal Law?
- Load Factor Limitation (+2.5/-1)
- Pitch Attitude (30 degrees UP/15 degrees DN)
- Bank Angle (67 degrees)
- High Speed
- High AOA (AOA Alpha Protection)
How does the High Speed Protection operate?
If Vmo/Mmo plus a predetermined factor is exceeded, the system induces a pitch-up input to limit aircraft speed
Can the pilot override this pitch-up?
No
What is Alpha Max?
The maximum AOA allowed in Normal Law, indicated by the top of the red strip on the airspeed scale
How does High AOA Protection operate?
When the angle of attack exceeds alpha prot, pitch trim ceases and AOA is now proportional to sidestick deflection, not to exceed alpha max even with full aft sidestick deflection.
What protection do you have in Alternate Law?
- Load Factor Stability
- High speed stability (Nose up command)
- Low speed stability (Nose down command)
Can you override the high or low stabilities in Alternate Law?
Yes
What protections do you have in Direct Law?
None
If you are in Pitch Alternate Law, what law would Roll be?
Direct Law
When the landing gear is extended, what happens to Pitch Alternate Law?
Degrades to Pitch Direct Law
When is there a direct relationship between sidestick and flight control surface deflection?
- When in Direct Law
- When below 100’
How would you get into Abnormal Attitude Law?
By exceeding approximately double the Normal Law limits
Can you stall the aircraft in Normal Law?
Not in Normal Law, but the aircraft CAN be stalled in other laws
What is the purpose of Abnormal Attitude Law?
Allows the aircraft to be recovered from an unusual attitude
After recovery from an unusual attitude, what law will you be in?
Abnormal Attitude Law
Will Abnormal Law revert to Direct Law on landing gear extension?
No
What PFD indications indicate Normal Law?
- Green: for pitch, bank, and overspeed limits
- Amber/Black (alpha prot) airspeed tape
What is indicated if the PFD pitch and bank limits are amber Xs?
You are not in Normal Law
What would cause you to revert to another law?
Multiple failures of redundant systems
What law are you in when you perform the flight control check on the ground?
Normal Law, Ground Mode
Can the aircraft be flown with a loss of all flight control computers?
Yes, in Mechanical Backup
How is the airplane controlled in Mechanical Backup?
- PITCH: Trim Wheel (horizontal stabilizer)
- YAW: Rudder Pedals (Rudder)
- SPEED: Thrust Levers
What is the meaning of USE MANUAL PITCH TRIM?
You are in Direct Law
Under Normal Law, what does ELAC 1 control?
- Primary - Aileron control (roll)
- Standby - Elevator/Trimable Horizontal Stabilizer (THS) control (backs up ELAC 2)
- Provides 5 degree aileron droop
Under Normal Law, what do the FACs provide? (YAWL)
- Yaw Control (Damping & Turn coordination, rudder limiter, rudder trim)
- Airspeed protection computation (Alpha Prot, High/low limits, manoeuvring speed, PFD speed scale)
- Windshear protection
- Low Energy Warning Protection (“SPEED, SPEED, SPEED”)
How can you determine you are in Alternate Law?
- Amber “X’s” at the pitch (30 degrees up/15 degrees down) and Bank (67 degrees) limits
- Only Vls and Vsw is displayed on the airspeed scale
What do flashing green CAPT and F/O SIDESTICK PRIORITY lights indicate?
Both sidesticks have been moved simultaneously and neither pilot has taken priority
What happens when both pilots make an input simultaneously on the sidesticks?
- The inputs are algebraically summed up to the normal limits
- An aural “Dual Input” will sound
- Green CAPT and F/O lights will illuminate
