FLIGHT CONTROL LAWS Flashcards
What protections do you have in Normal Law?
o High Speed o High Angle of Attack (AOA alpha protection) o Load Factor Limitation (+2.5 / -1.0) o Pitch Attitude (30° UP/15° DN) o Bank Angle (67°)
How does the High Speed Protection operate?
o If VMO/MMO plus a predetermined factor is exceeded, the system induces a
pitchup input to limit aircraft speed.
Can the pilot override this pitch-up?
No
What is Alpha Max?
o The maximum angle of attack allowed in Normal Law, indicated by
the top of the red strip on the airspeed scale
How does High Angle of Attack Protection operate?
o When the angle of attack exceeds α PROT, pitch trim ceases and
angle of attack is now proportional to sidestick deflection, not to
exceed α max even with full aft sidestick deflection.
What is Alpha Floor Protection?
When the AOA exceeds a specific threshold (somewhere between V
Alpha PROT and V MAX) the A/THR is automatically activated and
commands TOGA thrust, regardless of TL position.
Alpha Floor Protection is a function of what system?
o A/THR
o Requires operative A/THR system to operate.
What happens to thrust and what annunciates on the FMA when you
reach Alpha Floor?
o Thrust – TOGA
o FMA – A.FLOOR
What occurs during Alpha Floor Protection after speed increases above
Vls?
o FMA changes to TOGA LK
How do you regain normal A/THR?
o Move TL to the TOGA detent
o Press the Instinctive Disconnect Button
o Return TL to the CLB detent
o Push the A/THR PB to engage A/THR
When is Alpha Floor Protection active?
o From lift-off through 100FT RA on approach.
Can you override the high or low stabilities in Alternate Law?
Yes
If you are in Alternate Law, what law would Roll be?
Direct Law
Can you stall the aircraft in Normal Law?
o Not in Normal Law, but the aircraft can be stalled in all other laws.
What PFD indications indicate Normal Law?
o Green = for pitch, bank, and overspeed limits
o Amber/black (alpha PROT) airspeed tape
