FLIGHT CONTROLS

Question 1

How many Flap Control Units (FCUs) are provided?

Answer 1

Three.

Question 2

What are the basic functions of the FCUs?

Answer 2

Primary control.
Secondary control.
Indication and annunciation.

Question 3

How many groups of leading flaps are provided, and how are they normally powered?

Answer 3

Three;

Inner, midspan and outboard. Pneumatically powered by bleed air duct.

Question 4

What are the two groups of trailing edge flaps, and how are they powered?

Answer 4

Inboard HYD system 1

Outboard HYD system 4.

Question 5

How are opposite trailing edge flaps connected?

Answer 5

Mechanically connected to maintain symmetry.

Question 6

What protection features do FCUs provide for trailing edge flaps in primary mode?

Answer 6

Asymmetry.
Disagree.
Uncommanded motion protection
Load relief flaps 25 and 30.

Question 7

What protection features do the FCUs provide for trailing edge flaps in secondary mode?

Answer 7

Asymmetry.
Disagree.
Uncommanded motion protection

Question 8

Describe the function of the FCUs in primary mode.

Answer 8

FCU’s drive the leading edge flaps pneumatically and trailing edge flaps hydraulically.

Question 9

Describe the function of the FCUs in secondary mod.

Answer 9

FCU’s drive flap groups though electric motors.