Flight Controls

Question 1

How many groups of LE flaps are there? How are they normally powered?

Answer 1

-3 groups: Inborad, Midspan, Outboard
-Normally pneumatically powered from the bleed duct

Question 2

What are the 2 groups of TE flaps and how are they normally powered?

Answer 2

-Inboard and Outboard
-Inboard: Hyd System 1
Outboard: Hyd system 4

Question 3

Is there asymmetry protection in alternate flap mode?

Answer 3

No. No protection provided by the FCU in alternate mode

Question 4

How are the TE flaps driven in primary mode?

Answer 4

Hydraulically

Question 5

How long does the flap indication display on EICAS after flaps are UP?

Answer 5

10 seconds

Question 6

What protections do FCU provide TE flaps in Primary Mode?

Answer 6

-Asymmetry
-Flap Load Relief
-Flap position indication to EICAS/Other systems

Question 7

What is the maximum flap extension in alternate mode?

Answer 7

25

Question 8

How does alternate flaps control work?

Answer 8

-Bypasses FCU’s
-Can be manually selected
-All flaps extend/retract electrically
*No asymmetry protection in alternate mode

Question 9

What happens if a primary control failure of inboard or mid span LE flap group?

Answer 9

Both groups switch to Secondary mode

Question 10

-8 To improve performance and reduce noise, outboard ailerons deflect down at which flap setting?
Return to natural and which flap setting?
Inboard ailerons droop at which flap setting?

Answer 10

-10 or 20
-25 or 30
-10 or greater
* Downward deflection is removed if the AoA is above stick shaker

Question 11

What is the effect on flap system during thrust reverse operation?

Answer 11

Inboard and Midspan LE flaps auto retract

Question 12

What surface component is moved when stabilizer trim inputs are made?

Answer 12

LE of the movable horizontal stabilizer. Stab trim varies the incidence of the movable horizontal stabilizer.

Question 13

What system assists -8 in pitch stability and landing flare?

Answer 13

Pitch Augmented Control System (PACS)
During landing flare, this system provides a small amount of up elevator as the airplane approaches the runway, without moving the control column.

Question 14

When does -8 takeoff and landing tail strike protection activate?

Answer 14

-PACS senses imminent tail strike
Decreasing elevator deflection
(Doesn’t move the control column)

Question 15

Take off trim setting is based on FMC calculated

Answer 15

-Gross weight
-C of G
-take off thrust de-rate selection
-take off flap setting (-8 only)