Protections Flashcards
What is high speed protection?
As the speed increases past Vmo/Mmo the sidestick nose-down authority is progressively reduced and a permanent nose up order is applied.
When does high speed protection begin ?
Vmo+6 which is the two green bars.
What happens if the speed goes past Vmo+6(overspeed) with a neutral sidestick?
The aircraft will slightly overshoot vmo/mmo and fly back towards the envelope.
What happens if the speed goes past Vmo+6(overspeed) with the sidestick held forward?
The aircraft will significantly overshoot vmo/mmo, at approx Vmo+16/Mmo+0.04 the nose down pitch authority reduces to zero, speed begins to come back towards flight envelope.
When does the autopilot disconnect during high speed protection?
Vmo+15
When does the ECAM display an overspeed?
VMO+4 MMO+0.006
What are the different protections the Airbus has?
Load factor
Pitch
Bank angle
High speed
Low speed/ high angle of attack
Why do we have load factor protection?
To prevent the aircraft from being overstressed, even with full back stick.
Allows us to pull fully back into alpha floor if required to give maximum obstacle clearance.
What is load factor protection in g?
What g do we maintain in the neutral sidestick postion?
Clean +2.5g to -1g
Any other config +2.0g to 0g
Neutral sidestick maintains 1g flight
What is ground mode?
Ground mode is a direct relationship between sidestick deflection and elevator deflection, without auto trim.
When the aircraft reaches 75 kt during the takeoff roll, the system reduces the maximum up elevator deflection from 30 ° to 20 °.
What is pitch attitude protection?
30 ° nose up in conf 0 to 3 (progressively reduced to 25 ° at low speed).
25 ° nose up in conf FULL (progressively reduced to 20 ° at low speed).
15 ° nose down (indicated by green symbols “=” on the PFD’s pitch scale).
The flight director bars disappear from the PFD when the pitch attitude exceeds 25 ° up or 13 ° down. They return to the display when the pitch angle returns to the region between 22 ° up and 10 ° down.
What is flight mode?
Sidestick to load factor demand
Neutal sidestick maintains 1g in pitch
Sidestick to roll demand, max 15degrees per second.
When high angle of attack protection is activated what does the sidestick now control?
Angle of attack
When is alpha floor protection available?
Available from lift off to 100 ft RA on the approach.
When does alpha floor trigger?
> 9.5 degrees clean
15 degrees (flap 1/2)
