Flight Controls Flashcards
How are flight controls actuated?
Mechanically - ailerons, elevators, rudder
Hydraulically - spoilers
How many degrees can the control wheel rotate?
87 degrees left or right
Results in max aileron deflection of 14 degrees
What powers aileron trim
DC emer bus
How far can the aileron trim tab be moved?
6.7 degrees up or down
Takes approx 30 secs to obtain full roll trim travel
What does the illuminated position lifht on the spoiler indicator mean?
The spoiler is not in the retracted position
How can you disengage the pitch coupling mechanism?
By applying differential force on the control columns
The operating control column can then control its associated elevator
PITCH DISCONNECT on the CAP, master warning and CRC
How far can the control columns travel?
11.25 degrees up and 6.75 degrees down
Results in 23 degrees nose up and 13 degrees nose down
When will you get a PITCH TRIM ASYM light?
When the tab position differential exceeds a certain amount from each other
Master caution, FLT CTL light on the CAP
Will inhibit pitch control systems
Will cause ap to disengage
How long does full pitch trim travel take?
Approx 30 secs
Max deflection is 5 degrees up and 1.5 degrees down
What does the green band represent on th pitch trim indicator?
Represents the normal pitch trim position for take off
Band ranges from 2.5 degrees up to 0 degrees
What is the stall protection?
Two stick shakers and one stick pusher attached to the captains control column
When will you get a FAULT light on the stick shaker/pusher pb?
If the alpha probes disagree
If power for the stick pusher motor is lost
If flap position signal is incorrect
What does the Releasable Centering Unit do? (RCU)
Centres the rudder when no forces are applied to the rudder pedals
What does the Travel Limitation Unit do?
Limits the amount of rudder travel based on airspeed
Uses airspeed from the two ADCs
What airspeed does the TLU work?
Automatic mode - when aircraft accelerates through 185 kt, removed when aircraft slows below 180 kt
When does the RUD TLU LO SPD light illuminate green?
Whenever rudder travel is not limited
Why will you get a TLU FAULT light?
- disagreement between actual position of the limiting fork and the commanded position
- dual ADC failure
- airspeed data disagreement between the two ADC
- TLU position synchronisation failure
What does the yaw damper due?
- regulates rudder travel speed in flight
- limits excessive rudder movement due to wind gusts on the ground
How long does full rudder trim travel take?
15 seconds
What does the flap EXT flag mean?
- appears when flap valves is in the flaps extend position
- if it remains in view after the flaps are extended it indicates there may be a leak in the flaps hydraulic circuit
When will the FLAP ASYM light illuminate?
If there is a difference between left and right inboard flaps that exceeds 6.7 degrees
Once this happens, flap lever is inop and can only be reset on the ground
When will you get a FLP UNLK light on the CAP?
If flaps are extended and they retract more than 3 degrees without a flap retraction being selected
CRC, master warning and blue EXT flag
When will the AIL LOCK illuminate?
In the event one of the aileron locking actuators disagrees with the position of the gust lock
When can you engage the gust lock?
Can occur regardless of the position of the flight controls
Controls must be brought back to neutral to positively lock the locking mechanism
What powers the stick pusher and stick shakers?
Stick pusher - DC Bus 1
Stick shaker - the associated DC bus
When will the TLU FAULT light illuminate?
- system disagreement
- dual ADC failure
- inconsistent ADC data
- failure of the TLU position synchronisation system
How is aileron trim achieved?
By repositioning the neutral point of the left aileron spring tab
How is aileron trim achieved?
By repositioning the neutral point of the left aileron spring tab
