Flight Controls

Question 1

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

Answer 1

• 3 groups on each wing: outbard, midspan, inboard
  -Normally pneumatically powered from the bleed air duct

Question 2

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

Answer 2

-inboard and outboard
-inboard powered by hydraulic system 1
-outboard by system 4

Question 3

Is there any asymmetry protection in alternate flap mode?

Answer 3

NO, there is no protection provided by the FCUs in alternate mode.

Question 4

How are the trailing edge flaps driven in primary mode?

Answer 4

Hydraulically

Question 5

How long does the flap indication on the primary EICAS remain displayed after all flaps are up?

Answer 5

10 seconds

Question 6

What protection features do FCUs provide for trailing edge flaps in primary mode? (3)

Answer 6

-Asymmetry protection
-flap load relief
-flap position information to EICAS and other systems

Question 7

How many Flap Control Units (FCUs) are provided?

Answer 7

(3)

Question 8

What is the maximum extension of trailing edge flaps in alternate mode?

Answer 8

Flaps 25

Question 9

What EICAS advisory message displays if all three FCUs fail in the control function?

Answer 9

FLAPS CONTROL

Question 10

How does the Flap Alternate Control Mode work? (3)

Answer 10

-Bypasses the FCUs
-can be manually selected
- all flaps are extended or retracted by electronic motors

Question 11

Is there any asymmetry protection in alternate flap mode?

Answer 11

NO

Question 12

What happens if a primary control failure occurs in eitehr the inboard or midspan leading edge flap group

Answer 12

both groups switch to secondary mode

Question 13

when do spoiler panels extend to the up position during landing if speedbrake lever is NOT armed?

Answer 13

-Thrust levers 1 and 3 near idle position
- main landing gear on ground
- reverse thrust levers 2 or 4 pulled up to the idle detent

Question 14

747-8. To improve takeoff performance and reduce noise, outboard ailerons deflected down* at which flap settings?

They return to neutral position at which flap settings?

Inboard ailerons droop in which flap settings?

Answer 14

-10 or 20

-25 or 30

-10 or greater

Question 15

Describe the function of the Stabilizer (STAB) Trim Cutout switches AUTO position.

Answer 15

• Supplies hydraulic power for stabilizer trim
• shuts off related system hydraulic power if unscheduled trim detected

Question 16

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

Answer 16

Inboard and Midspan leading edge flaps retract automatically

Question 17

What surface component is moved when stabilizer inputs are made?

Answer 17

-Leading edge of moveable horizontal stabilizer
-Stabilizer trim varies the angle of incidence of the horizontal stabilizer

Question 18

What is the purpose of the yaw dampers?

Answer 18

to improve airplane lateral and directional stability and provide turn coordination

Question 19

How does the aileron lockout system work and what is it’s purpose?

Answer 19

Locks outboard ailerons in the neutral position at high airspeed.

-prevents over controlling at high speeds

Question 20

What system assists the 747-8 in pitch stability and landing flare?

Answer 20

Pitch Augmentation Control System (PACS)

Question 21

When does the 747-8 takeoff and landing tail strike protection activate?

Answer 21

PACS senses imminent tail strike decreasing elevator deflection

Question 22

Takeoff Trim setting is calculated based on? (4)

Answer 22

-gross weight
-CG
-takeoff thrust derate selection
-takeoff flap selection (747-8 ONLY)

Question 23

Will pushing the control wheel stabilizer trim switches, with multiple autopilots engaged, cause the autopilot to disconnect?

Answer 23

NO

-inhibited when multiple autopilots engaged