Protections

Question 1

What is bank angle protection?

Answer 1

It is a protection that prevents major upset of the ac.

It is;
67 degrees - in normal flight envelop (2,5g level flight.
40 degrees - in high speed protection to prevent spiral dive.
45 degrees - in high angle of attack protection

Question 2

What protections do you still have in alternate law?

Answer 2

Alternate law with reduced protection:
Load factor protection.
Low speed STABILITY
High speed STABILITY

Alternate law without reduced protection:
Load factor protection.

Question 3

What are the protections available in normal law?

Answer 3

High angle of attack protection
Bank angle protection
High speed protection
High pitch attitude protection
Load factor protection

Question 4

What is high speed protection and how does it work?

Answer 4

It’s a protection to prevent the aircraft from reaching its maximum design speeds (VD/MD).

In a dive with no side stick input, the aircraft will slightly overshoot VMO/MMO and will automatically fly back towards the envelop.

If sidestick is maintained fully forward, the ac will significantly overshoot VMO/MMO but not exceed VD/MD. At approximately VMO+16/MMO+0,04 the pitch down authority of the sidestick reduces smoothly to 0.

Question 5

Describe our load factor protection

Answer 5

Load factor protection helps pilots in avoiding excessive loads on the airframe.

It is ;

2,5 G in clean config
2,0 G with flaps extended

Question 6

Describe high pitch attitude protection

Answer 6

Excessive pitch attitudes can lead to hazardous situations. For this reason the protections are;

+30 degrees
-15 degrees

Question 7

What is high angle of attack protection?

Answer 7

It enables the pilot to pull the sidestick full aft and thus in dangerous situations achieve best possible aircraft lift.

• if a/thr in speed mode, speed won’t go below VLS.
• aural low-energy warning “SPEED SPEED SPEED” in config 2 or more.
• if AOA still increases and reaches alpha floor, a/thr triggers TOGA.

Question 8

How do you disconnect alpha floor ?

Answer 8

You use the instinctive disconnection buttons on the thrust levers as soon as a safe speed is resumed.

After you can re-arm as usual.

Question 9

What is mechanical backup?

Answer 9

It enables the pilots to safely stabilize the aircraft using ridden and manual pitch trim while reconfiguring the systems.

Question 10

What is abnormal attitude law?

Answer 10

It helps the pilot to bring the aircraft from an abnormal attitude far outside the envelop, back to a normal attitude as quickly as possible.

Pitch alternate with load factor protection (without auto trim)
Lateral direct law with yaw alternate

Triggers when;
Pitch +50 / -30
Bank >125 degrees
AOA 30 to 40 degrees / -10 
Speed 440 kts / 60 to 90
Mach M0.91

Question 11

When is alpha floor available?

Answer 11

From liftoff to 100 ft RA on landing