FLIGHT CONTROLS Flashcards
How many groups of leading edge flaps are provided, and how are they
normally powered?
•Three groups on each wing: outboard, midspan, and inboard sections.
•Normally pneumatically powered from the bleed air duct.
FCOM, VOL 2; 9.20.13
What are the two groups of trailing edge flaps, and how are they powered?
•Inboard and outboard
•Inboard powered by hydraulic system 1
•Outboard by system 4
FCOM, VOL 2; 9.20.13
Is there any asymmetry protection in alternate flap mode?
•NO, there is no protection provided by the FCUs in alternate mode.
FCOM, VOL 2; 9.20.14
How are the trailing edge flaps driven in primary mode?
•Hydraulically
FCOM, VOL 2; 9.20.13
How long does the flap indication on primary EICAS remain
displayed after all flaps are up?
10 seconds
FCOM, VOL 2; 9.20.15
What protection features do FCUs provide for trailing edge flaps in primary mode?
•Asymmetry protection
•Flap load relief
•Flap position information to EICAS and other systems
FCOM, VOL 2; 9.20.13
How many Flap Control Units (FCUs) are provided?
Three
FCOM, VOL 2; 9.20.13
What is the maximum extension of the trailing edge flaps in
alternate mode?
•Flaps 25
FCOM, VOL 2; 9.20.15
What EICAS Advisory message displays if all three FCUs fail in their control function?
FLAPS CONTROL
FCOM, VOL 2; 9.30.1 & QRH 9.4
How does the Flap Alternate Control mode work?
•Bypasses the FCUs
•Can be manually selected
•All flaps are extended or retracted by electric motors
FCOM, VOL 2; 9.20.14
Is there any asymmetry protection in alternate flap mode?
•NO
- The FCU provide asymmetry protection in normal mode.
What happens if a primary control failure occurs in either the inboard or midspan leading edge flap group?
•Both groups switch to secondary mode
FCOM, VOL 2; 9.20.14
When do the spoiler panels extend to the up position during landing
if the speedbrake lever is NOT Armed?
•Thrust levers 1 and 3 near idle position.
•Main landing gear on the ground
•Reverse thrust levers 2 or 4 pulled up to the idle detent
FCOM, VOL 2; 9.20.11
747-8, To improve takeoff performance and reduce noise, outboard ailerons
deflected down* at which flap settings?
They return to the neutral position at which flap settings?
Inboard ailerons droop in which flap settings?
•10 or 20
•25 or 30
•10 or greater
*The downward deflection is removed if the angle of attack
is above the stick shaker
FCOM, VOL 2; 9.20.11
Describe the function of the Stabilizer (STAB) Trim Cutout Switches AUTO position.
•Supplies hydraulic power for stabilizer trim
•Shuts off related system hydraulic power if unscheduled
trim detected.
FCOM, VOL 2; 9.10.2
What is the affect on the flap system during engine reverse thrust operation?
Inboard and midspan leading edge flaps retract automatically
FCOM, VOL 2; 9.20.15
What surface component is moved when stabilizer trim inputs are made?
•Leading edge of the movable horizontal stabilizer
•Stabilizer trim varies the angle of incidence of the
horizontal stabilizer
FCOM, VOL 2; 9.20.3
What is the purpose of the yaw dampers?
To improve airplane lateral and directional stability and
provide turn coordination.
FCOM, VOL 2; 9.20.10 & QRH 9.20
How does the aileron lockout system work, and what is its purpose?
Locks outboard ailerons in the neutral position at high airspeeds.
Additional information;
- Permits full travel of the outboard ailerons at low airspeeds
- Prevents over‐controlling at high airspeeds
FCOM, VOL 2; 9.20.7
What system assists the 747-8 in pitch stability and landing flare?
Pitch augmentation control system (PACS)
Additional Information
- During the landing flare, this system provides a small amount of nose up
elevator as the airplane approaches the runway, without moving the
control column
FCOM, VOL 2 747-8; 9.20.3
When does the 747-8 takeoff and landing tail strike protection activate?
•PACS senses imminent tail strike Decreasing elevator deflection
Additional Information
- Activation of tail strike protection does not move the
control column
FCOM, VOL 2 747-8; 9.20.3
Takeoff trim setting is calculated based on__?
FMC calculated:
- gross weight
- center of gravity
- takeoff thrust derate selection
- takeoff flap selection (747-8 only)
FCOM, VOL 2; 9.20.4, 747-8, 9.20.5
Will pushing control wheel Stabilizer Trim switches, with multiple
autopilots engaged, cause the autopilot to disconnect?
No Stabilizer trim switches are inhibited with multiple
autopilots engaged
FCOM, VOL 2; 9.20.5, 747-8 9.20.6
