20 Flight Controls

Question 1

Normal law provides what protections?

Answer 1

1. High AoA
2. Load factor
3. Hight pitch attitude
4. Bank angle
5. High speed

Question 2

Alternate law characteristics

Answer 2

Usually triggered by dual failure

In pitch: Same as normal law
In roll: Same as in normal law (ALTN1),
or Roll Direct (ALTN2)
In yaw: Same as in normal law (ALTN1),
or degraded (ALTN2)

Most protections lost, except:

• Load factor protection
• Bank angle protection

Question 3

At the flight envelope in Alternate Law, the aircraft is not protected in?

Answer 3

In high speed, natural a/c static stability is restored with an overspeed warning.

In low speed (at a speed threshold below VLS), the auto pitch trim stops, and natural longitudinal static stability is restored, with a stall warning at 1.03 VS1G.

Question 4

Direct Law

Answer 4

Usually triple failure.

1. Elevator deflection is proportional to stick deflection. Max deflection depends on config and CG.
2. Aileron and spoiler deflections are proportional to stick deflection, but vary with config.
3. Pitch trim is commanded manually.
4. Yaw damper and minimum turn coordination are provided.