Flight Controls CBT's Flashcards
How many elevators are there?
4
Pilot input to the elevator directly controls the ____ panels, and those directly control the ____ panels.
inboard ; outboard
Elevator feel is powered by____
Hydraulic system 2 and 3
Can elevator feel run on only 1 hydraulic system?
Yes
What happens to the hydraulic feel if both hydraulic system 2 and 3 goes down?
You lose airspeed gain scheduling and the feel is based only on springs
How is stab trim powered?
Hydraulic system 2 and 3
Why do the stab trim cutout switches say “stab trim 2 and 3”?
Because hydraulic system 2 and 3 power them.
What happens when you select a stab trim to the cutout position?
It depressurizes that stab trim hydraulic actuator
The stab trim cutout switch has 3 positions. cutout, auto, and on. What is each?
Cutout: cuts hydraulic power to the STCM
Auto: System logic will automatically cutout if it detects a runaway
On: Overrides AUTO logic and supplies hydraulic power to STCM
What is stab trim control column cutoff?
It automatically (temporarily) cuts the stab trim STCM if the control column is moving opposite of desired trim direction. (Trimming nose up but pushing nose down) etc.
How many different green takeoff trim bands are there? How are they calculated?
- Nose down band, mid band, nose up band.
They are calculated based on the CG, takeoff thrust, and gross weight entered into the FMC
What does the aileron lockout mechanism do?
It locks the outboard ailerons at high speeds, to prevent over control. Above 238 knots is where they lockout
What happens if you trim the ailerons with the autopilot engaged?
The autopilot will fight that trim, and when you disengage the AP, it will violently snap the controls back to center. Aileron trim with autopilot engaged is forbidden.
On the status page, you can see position of flight control surfaces. In flight, you deploy speedbrakes. On the synoptic page, you see only the left spoilers are raised and the right are stowed. Is this cause for alarm?
No, it is normal. This is because the left display shows you the position of the 4th panel from the wingtip (used as speedbrake, ground spoiler, roll). The right side displays position of the most outboard (used as roll and ground spoiler, but no speedbrake).
If you got an EICAS advisor “AILERON LOCKOUT”, what does this mean?
If one or both outboard ailerons are not locked out at high speed, or they are locked out at low speed.
What are the takeoff flap settings?
10 or 20
What are the landing flap settings?
25 or 30
How many groups of leading edge flaps are there?
3 per wing. Outboard, midspan, inboard
How are the leading edge flaps powered?
Pneumatically, with an electric drive backup (slower rate)
How many groups of TE flaps are there?
2 per wing. Outboard and inboard.
How are the TE flaps powered?
Normally by hydraulic system 4 for outboard, and hydraulic system 1 for inboard. But there is an electric drive for backup.
How many flap modes are there? Which modes utilize the FCUs?
- Primary, secondary, and alternate. Primary and secondary use the FCUs, but alternate is direct flap control with no FCU.
How many FCU’s are there?
3 flap control units
To simplify all the different flap settings and configurations, what are the only 2 detents that move the leading edge flaps and what happens with each?
Flaps 1: LE flaps inboard and midspan extend (trailing edge do not move)
Flaps 2: LE flaps Outboard extend. (trailing edge flaps move to 5 position)
Any further movement: No effect on leading edge flaps
