Flight Control Laws

Question 1

Explain Normal Law

Answer 1

Protects the a/c throughout the flight envelops, as follows:

• Load factor limitation
• Pitch attitude limitation
• High AOA protection
• High speed protection

Question 2

What Protections are available in Normal Law?

Answer 2

-Bank : 67 degrees max, > 33 lose auto trim and if released returns to 33, > 45 AP/FD turn off, < 40 FD returns.
-Yaw : dampening and trun coordination
-Pitch : 25-30 nose up, flaps 0-3, FD off/on 25/22
: 20-25 nose up, flaps full, FD off/on 25/22
: 15 nose down, all config, FD off/on 13/10
-AOA : Vmax, VLS, Alpha PROT, ALPHA MAX
-Load : Clean -1.0 to +2.5
: Slats/flaps 0 to +2.5
-Speed : VMO+6, A FLOOR on FMA and EWD

Question 3

Explain Alternate Law

Answer 3

• The a/c goes into alternate law when there are multiple failures of redundant systems.
• Some protections are lost.

Question 4

What protections are available in alternate law?

Answer 4

• Bank : No protection
• Yaw : Dampening only
• Pitch : No protection
• AOA : VLS, VSW
• Load : Normal
• Speed : Stabilities, it will vary

Question 5

How do you know that you are in Alternate Law?

Answer 5

• The green dashes for pitch and bank protections turn to amber “x”
• VLS
• VSW (red and black)