Flight Controls Flashcards
Which hydraulic system power the flight controls?
All 3
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 33* to 4* based on flap position and airspeed
What provides gust lock protection on the ground?
Residual hydraulic pressure trapped by check valves in the PCUs
Which control wheel is the autopilot roll servo connected to?
First Officer
Which control column is the autopilot pitch servo connected to?
The captains
What indications will be present with a PCU runaway ?
One of the 2 green roll select lights will be illuminated
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 or trim position
Where do the yaw dampers receive data from?
YD 1 receives data from FCC 1
YD 2 receives data from FCC 2
What do 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 captains 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 opposite Multi function spoilers and vice versa
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 first officer’s side
How many PCUs power the rudder?
3
If the rudder is jammed, how can control be regained?
Increasing the pressure on the rudder pedals will cause the bungie breakout system to be activated and control can be regained
How many stab trim motors are active at a time?
Only 1 motor drives the jackscrew at a time. The other motor free wheels with the operative motor, and assumes control if the operating motor fails
Will the autopilot disengage if manual control yoke trim is used?
Yes. The autopilot will disengage
Name the 4 different trims in order of priority (M A A M)
Manual trim from either control yoke (Captain’s has priority)
Autopilot trim
Auto trim (Flap compensation trim)
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 or 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 valves 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 then 230 KIAS?
No
Will the alternate flap extension switch override the position of the flap handle?
Yes
Will the stick pusher engage if only 1 switch is armed?
No
