Flight Control Laws - REV 04

Question 1

What protections are available in Normal, Alternate, Direct, Mechanical Backup, and Abnormal Attitude Laws?

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Answer 1

See A320 Laws & Protections (BYPALS) in Section B of A319/320 Study Guide Rev 04 available at pilots.alaskaair.com > Training > Airbus Training > Training Documents icon

Question 2

How does the High Speed Protection operate?

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Answer 2

If Vmo/Mmo plus a predetermined factor is exceeded, the system induces a pitch-up input to limit aircraft speed

Question 3

Can the pilot override the auto pitch-up associated with High Speed Protection in Normal Law?

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Answer 3

NO

Question 4

What is Alpha Max?

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Answer 4

The maximum angle of attack allowed in Normal Law, indicated by the top of the red strip on the airspeed scale

Question 5

How does High Angle of Attack Protection operate?

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Answer 5

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

Question 6

What protection do you have in Alternate Law?

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Answer 6

a. Load Factor

b. High speed stability (Nose up command) but can be overridden

c. Low speed stability (Nose down command) but can be overridden

Question 7

What protections do you have in Direct Law?

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Answer 7

None

Question 8

Can you override the high speed stability in Alternate Law?

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Answer 8

Yes

Question 9

If you are in Pitch Alternate Law, what law would Roll be?

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Answer 9

Direct Law

Question 10

When is there a direct relationship between sidestick and flight control surface deflection?

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Answer 10

a. When in Normal Law, Ground Mode

b. When in Direct Law

c. When below 50 feet in Flare Mode (pitch only)

Question 11

How would you get into Abnormal Attitude Law?

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Answer 11

By exceeding approximately double the Normal Law limits

Question 12

What is the purpose of Abnormal Attitude Law?

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Answer 12

Allows the aircraft to be recovered from an unusual attitude

Question 13

After recovery from an unusual attitude, what law will you be in?

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Answer 13

Abnormal Attitude Law

Question 14

Will Abnormal Attitude Law revert to Direct Law on landing gear extension?

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Answer 14

NO

Question 15

What PFD indications indicate Normal Law?

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Answer 15

a. Green = for pitch, bank, and overspeed limits

b. Amber/black (alpha protection) airspeed tape

Question 16

What is indicated if the PFD pitch and bank limits are amber X’s?

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Answer 16

You are not in Normal Law

Question 17

What would cause you to revert to another law?

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Answer 17

Multiple failures of redundant systems

Question 18

What law are you in when you perform the flight control check on the ground?

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Answer 18

Normal Law, Ground Mode

Question 19

Can the aircraft be flown with a loss of all flight control computers?

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Answer 19

Yes, in Mechanical Backup

Question 20

How is the airplane controlled in Mechanical Backup?

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Answer 20

Pitch – Trim wheel (horizontal stabilizer)

Yaw – Rudder pedals (rudder)

Speed – Thrust levers