Flight Controls Flashcards
Can the STAB TRIM be disconnected with STAB TRIM ENGAGE switches (CH1 CH2)?
No
Emergency flap gated switch - deploy position - what happens when engage?
In the event of a problem with the slat flap handle, this switch can be used to extend the flap/slats to 20’ below an airspeed of 230 kts
Will the flaps deploy using the emergency flap gated switch if airspeed is in excess of 230?
No
If there is a problem with the flap power drive unit (PDU) will the EMER FLAP SWITCH force the flaps/slats to extend or retract?
No, it only serves as a backup for the lever inside.
If the AP/SP DISC switch is pressed and held for more than 4 seconds, what EICAS message would be expected?
STALL FAIL caution message would illuminate. After switch is released, message will should extinguished.
What is indicated by the amber ROLL SEL switchlight?
When illuminated, pilot without jammed controls will select switchlight and have control of multi-function spoilers on both wings.
What is indicated by the green pilot or copilot portion of the ROLL switchlight?
Indicates that the switchlight has been pressed in. Deselecting should cause it to extinguish.
During a PCU control runway, with PLT or CPLT roll switchlight, which side should be illuminated?
Pilot side with properly functioning controls.
What is the rudder travel limiter?
Restricts tail loading at high speeds. Between 33 and 4 degrees based on flap position and airspeed.
Which control wheel is the autopilot roll servo connected to?
The first officer’s side.
Which control wheel is the autopilot pitch servo connected to?
The captains side
What indications will be present with a PCU runway?
One of the 2 green roll select sides will illuminated
When the aileron trim is in the normal range on the ground, what color will it be displayed in?
Green, will turn white when moved out of the normal range.
What color will the aileron trim be displayed while in flight?
White, regardless of trim position
What do the yaw dampers do?
Improve lateral stability and alleviate dutch roll
When the pitch disconnect handle is pulled, will the autopilot be available? And why?
The autopilot may not be available because autopilot servo for pitch is located on the captains side.
When the roll disconnect handle is pulled, will the autopilot be available? And why?
The autopilot may not be available because the autopilot server for roll is located on the first officers side.
How many PCU’s power the rudder?
3, which are powered by the hydraulic systems.
If the rudder is jammed, how can control be regained?
Increased pressure on the rudder pedals will activate the bungee breakout system causing control to 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 operating motor fails.
Will the autopilot disengage if the manual control yoke is used.
Yes
Name the 4 different trims in order of priority.
MAAM Manual trim, captain 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 SSCU’s (Spoiler Stabilizer Control Unit)
What is auto trim?
Auto trim compensates for changes in aircraft pitch associated with flap extension or retraction.
What is the purpose of split switch on the control yoke for STAB TRIM?
To prevent inadvertent trim adjustment
Will the alternate flap extension switch move the slat/flaps faster than 230 kts?
No
Will the alternate flap extension switch override the flap handle?
Yes, to 20 degrees.
Will the stick pusher engage if only one switch is armed?
No
If the ground spoilers failed to deploy after touchdown, what action can be taken?
Move the ground lift dumping switch to MAN ARM.
How is hydraulic pump 3B powered in the event of a total electrical failure?
The ADG
What protects the flight controls in the event of a PCU runaway?
Bungee breakouts
What protects the ailerons from flutter in the event of a loss of pressure to the PCUs?
Flutter dampers
What are the slats and flaps powered by?
2 electric motors, each controlled by to slat/flap electronic control units (SFECU’s)
What happens if one slat or flap motor fails?
The slats/flaps will operate at half speed
What is the elevator travel?
23’ up and 18’ down
Where is the rudder or aileron miss-trim indicated?
It will be indicated as a boxed R or A on the PDF.
When do spoilers retract after landing?
40 seconds after weight on wheels
In the event of a pending stall, what automatic warnings will be provided?
Stick pusher, continuous ignition, autopilot disengaged, audible warning.
What does the GLD UNSAFE (Ground Lift Dumping) indicate?
Indicates ground lift dumping may occur inadvertently if the system is not manually disarmed.
