Oral Bank - FLIGHT CONTROLS

Question 1

How many groups of leading edge flaps are provided? How are they normally powered?

Answer 1

• 3 groups (outboard, midspan and inboard)
• Pneumatically powered from the bleed air duct

Question 2

What are the 2 groups of trailing edge flaps, and how are they powered?

Answer 2

• Inboard by hydraulic system 1
• Outboard by hydraulic system 2

Question 3

Is there any asymmetry protection in alternate flap 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 primary EICAS remain displayed after all flaps are up?

Answer 5

10 seconds

Question 6

What protection features do FCU’s provide for tailing edge flaps in primary mode? (3)

Answer 6

• Asymmetry
• Flap load relief
• Flap position info to EICAS

Question 7

How many Flap Control Units (FCU’s) are provided?

Answer 7

3

Question 8

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

Answer 8

25

Question 9

What EICAS Advisory message displays if all 3 FCU’s fail in their control?

Answer 9

FLAPS CONTROL

Question 10

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

Answer 10

• Bypasses the FCU’s
• Can be manually selected
• All flaps extended or retracted by electric 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 either the inboard or midspan leading edge flap group

Answer 12

Both groups switch to secondary mode

Question 13

When do the spoiler panels extend to the up position during landing if the speedbrake level is NOT armed? (3)

Answer 13

• Thrust levers 1 & 3 idle
• Main gear on ground
• Reverse thrust levers 2 & 4 in idle detent

Question 14

747-8, to improve T/O performance and reduce noise, outboard ailerons deflect down at which flap settings? They return to the neutral position at which flap settings? Inboard ailerons droop in which flap setting?

Answer 14

• 10 or 20
• 25 or 30
• 10 or greater

Question 15

Describe the function of the STAB Trim Cutout Switches AUTO position? (2)

Answer 15

• Supplies hydraulic power for STAB trim
• Shuts of related system hydraulic power if unscheduled trim detected

Question 16

What is the affect 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 STAB trim inputs are made?

Answer 17

Leading edge of horizontal stabiliser

Question 18

What is the purpose of the yaw dampers? (2)

Answer 18

• improve lateral and directional stability, and
• provide turn coordination

Question 19

How does the aileron lockout system work, and what is its purpose?

Answer 19

Locks outboard ailerons 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

When PACS senses imminent tail strike and decreases elevation deflection

Question 22

T/O trim setting is calculated based on ________? (4)

Answer 22

• gross weight
• C of G
• T/O thrust derate selection
• T/O flap setting (-8)

Question 23

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

Answer 23

No