Flight Controls Flashcards
Which hydraulic systems power the flight controls?
All three hydraulic systems provide power.
What is the rudder travel limiter?
The rudder travel limiter restricts rudder movement to prevent excessive tail loading at high speeds. It receives airspeed inputs from the Air Data Computers, and the Slat/Flap Electronic Control Unit. Rudder travel will be restricted from 33º to 4º based on flap position and speed.
What provides gust lock pretection on the ground?
Residual hydraulic pressure trapped by checkvalves in the PCUs.
Which control wheel is the autopilot roll servo connected to?
The FO’s.
Which control column is the autopilot pitch servo connected to?
The Captain’s.
What indications will be rpesent with a PCU runaway?
One of the two green roll select lights will be illumintaed.
When the aileron trim is in the normal range on the ground, what color will it be displayed in?
Green. It will turn white when moved out of the normal range.
What color will the aileron trim be displayed in during flight?
White, regardless of trim position.
Where do the yaw dampers receive data from?
YD 1 receives data from FCC 1, and YD 2 receives data from FCC 2.
What do the yaw dampers do?
They improve lateral stability and alleviate dutch roll.
When the PITCH DISC handle is pulled, will the autopilot be available? Why?
The autopilot may not be available because the autopilot servo for pitch control is located on the Captain’s side.
When the ROLL DISC handle has been pulled, what roll control surfaces will each yoke have control of?
The left yoke controls the left aileron, and the right yoke controls the right aileron. Each yoke controls the opposite side’s multifunction spoilers.
After the ROLL DISC handle is pulled, will the autopilot be available? Why?
The autopilot may not be available because the autopilot servo for roll control is located on the FO’s side.
How manh PCUs power the rudder?
Three.
If the rudder is jammed, how can control be regained?
Increasing the pressure on the rudder pedals will cause the bungee breakout system to be activated and control can be regained.
How many stab trim motors are active at a time?
Only one motor drives the jackscrew at a time. The other motor free wheels with the operative mnotor, and assumes control if the operating motor fails.
Will the autopilot disengage if manual control yoke trim is used?
Yes.
Name the four different trims in order of priority.
- Manual Yoke Trim
- Autopilot Trim
- Auto Trim (flap compensation)
- Mach Trim
What protection is provided in the event of a stab trim runaway?
Stab trim brakes controlled by the SSCUs.
What is auto trim?
Auto trim compensates for changes in aircraft pitch associated with flap extension and retraction. It is also known as Flap Compensation Trim.
What is the purpose of the split switch on the control yoke for stab trim?
Both halves of the switch must be moved together to engage the trim motors. If one half of the switch jams the trim motors will not run.
Will the alternate flap extension switch move the slats and flaps while flying faster than 230 KIAS?
No.
Will the alternate flap extension switch override the position of the flap handle?
Yes.
Will the stick pusher engage if only one switch is armed?
No.
