Flight Controls Flashcards
How many groups of leading edge flaps are provided and how are they normally powered?
-3 groups, inboard, midspan, and outboard
-Normally pneumatically powered from the bleed air duct
What are the two groups of trailing edge flaps and how are they powered?
-Inboard and outboard
-Inboard Hydraulic System 1
-Outboard Hyrdaulic System 4
Is there any asymmetry protection in alternate flap mode?
NO, there is no protection provided by the FCUs in alternate mode
How are the trailing edge flaps driven in primary mode?
Hydraulically
How long does the flap indication on primary EICAS remain displayed after all flaps are up?
10 seconds
What protection features do FCUs provide for trailing edge flaps in primary mode?
1-Asymmetry protection
2-Flap load relief
3-Flap position information to EICAS and other systems
How many FCUs are provided?
Three
What is the maximum extension of the trailing edge flaps in alternate mode?
Flaps 25
What EICAS advisory message displays if all three FCUs fail in their control function?
FLAPS CONTROL
How does the flap alternate control work?
1-Bypasses FCUs
2-Manually Selected
3-All flaps extended or retracted by electric motors
Is there any asymmetry protection in alternate flap mode?
NO - FCU only provide asymmetry protection in normal mode
What happens if a primary control failure occurs either in the inboard or midspan leading edge group?
Both groups switch to secondary mode
When do the spoiler panels extend to the up position during landing if the speedbrake lever is NOT armed?
1-Thrust levers 1 and 3 near idle
2-Main landing gear on ground
3-Reverse thrust levers 2 or 4 pulled up to idle detent
-8 To improve takeoff performance and reduce noise, outboard ailerons are deflected down at which flap settings?
-They return to neutral position at which flap settings?
-Inboard ailerons droop in which flap settings?
1-10 or 20
2-25 or 30
3-10 or greater (Removed if AOA above stick shaker)
Describe function of the stabilizer (STAB) trim cutout switches AUTO position
-Supplies hydraulic power for stab trim
-Shuts off system hydraulic power if unscheduled trim detected
What is the affect on the flap system during engine reverse thrust operation?
Inboard and midspan LE flaps retract automatically
What surface is moved when stab trim inputs are made?
-Leading edge of horizontal stabilizer
-Stabilizer trim varies the angle of incidence of the horizontal stabilizer
What is the purpose of the yaw dampers?
Improve lateral and directional stability and to provide turn coordination
How does the aileron lockout system work and what is it’s purpose?
-Locks ouboard ailerons in neutral position at high air speeds
-Permits full travel of outboard aileron at low airspeeds
-Prevents overcontrolling at high airspeeds
What system assits the -8 in pitch stability and landing flare?
-Pitch Augmentation Control System (PACS)
-During landing flare, provides small amout of nose up elevator as airplane approaches runway without moving control column
When does the -8 takeoff and landing tail strike protection activate?
PACS sense imminent tail strike decreasing elevator deflection (does not move control column)
Takeoff trim setting is based on?
1-Gross weight
2-CG
3-Takeoff Thrust De-rate
4-Takeoff flap selection (-8 only)
Will pushing the control wheel stab trim switches, with multiple autopilots engage, cause the AP to disconnect?
No, trim switches inhibited with multiple AP engaged
