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Cessna Citation II Flight Controls

Cessna Citation II Flight Controls. Dr. Kurt Barnhart AST 473. Flight Controls. Overview Primary Flight Controls Ailerons Rudder Elevator -Manually actuated by rudder pedals and control column -Can be immobilized by control locks on ground

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Cessna Citation II Flight Controls

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  1. Cessna Citation II Flight Controls Dr. Kurt Barnhart AST 473

  2. Flight Controls • Overview • Primary Flight Controls • Ailerons • Rudder • Elevator -Manually actuated by rudder pedals and control column -Can be immobilized by control locks on ground -Mechanical Trim in all three axis + elec. Elev. trim

  3. Flight Controls • Secondary Flight Controls- • Electric flaps • Hydraulic speedbrakes -Stall Warning- stall strip on leading edge of each wing- aerodynamic buffet -Yaw damping- autopilot

  4. Flight Controls • General- control inputs are transmitted via cables and bellcranks • Rudder pedals are 3 position adjustable via a spring latch on rudder pedals-side • Fences on inboard edge of rt. Aileron and inboard edge of left aileron trim tab- air ailerons in returning to neutral

  5. Flight Controls • Rudder, rt. Elevator and left aileron- mechanical trim tabs actuated from cockpit • Pilot’s and co-pilot’s (optional) cnt’l wheel have a pitch trim switch • Control locks- on primary flight controls and throttles- operated from cockpit: • Neutralize controls & idle throttles • Rotate handle (CW) 45 deg. & pull until handle returns to horizontal- to release- rotate CCW & push in until horizontal- DO NOT TOW WHEN LOCKED!

  6. Flight Controls • Trim systems- standard mechanical- cockpit actuated & indicated • Rudder trim- only servo tab on aircraft- deflects at half rate of rudder- aids pilot movement • Elec. Trim- outboard horn of ea. cnt’l wheel- pilot’s inputs overrides co-pilots • AP/TRIM DISC on cont’l wheel or pulling PITCH TRIM CB- controls runaway trim

  7. Flight Controls • Secondary control • Fowler flaps- 0 – 40 deg., mechanically interconnected- prevents flap asymmetry and allows operation by one elec. Actuator • Speedbrakes- slotted panels on top & bottom of ea. Wing fwd. of flaps: • Used for increased descent rates • Increased drag and lift destruction on lndg.

  8. Flight Controls • Flaps- • Detented @ 15 deg. Position (T/O & lndg.) • Handle movement actuates switch- energizes two motors- position mechanically indicated on cockpit • Motors interconnected mechanically & actuated mechanically- normally operate in unison but one motor provides sufficient for normal operation

  9. Flight Controls • Flap Operation- • Moving flap handle- activates 1 of 2 switches in center pedestal- supplies pwr. To motors • At selected position- position indicator mechanically repositions cnt’l sw. to remove pwr. From motors • Mechanical drag- holds flaps in position • Limit sw.- prevent overrun up or down • No D.C.- N Flaps- fail in position • Travel time- 6 sec. 0 -full down, 3 sec. back

  10. Flight Controls • Speedbrakes- 2 positions- up & down • 2 hyd. Actuators • Solenoid valve • 4 speedbrake segments • SPD BRAKE EXTENDED annunciator • Pedestal control switch

  11. Flight Controls • Speedbrake Operation: • Placing speedbrake sw. in EXTEND- • Closes hyd. Bypass valve (HYD. PRESS ON lt.) • Energizes speedbrake solenoid valve- press. To speedbrakes- forces them out of mech. Downlocks • Safety valve- also closed • 2 position switch- spring loaded to retract- (can be held ext. above 85% N(2)- early models only) • At full travel press. Builds, bypass valve opens, annunciator goes out- solenoid valve neutralizes- trapping hyd. Press in actuators- holding extension

  12. Flight Controls • Speedbrake Retraction- • Place switch in retract • Hyd. Sys. Pressurizes • Safety valve opens (de-energizes) • Solenoid valve directs press. For retraction • Annunciator goes out- “Boards” retract into mechanical locks- system depressurizes • Locks- 2 pins on lower board panel- hydraulically forced into retaining clips.

  13. Flight Controls • Most models- if throttles above 85% N(2)- solenoid valve and bypass valve position for retraction • Safety valve- if elec. Failure w/ boards out- spring loads open- allows boards to blow down • If elec. Failure w/ boards retraction- no actuation possible

  14. Flight Controls • Stall Warning- stall strip on leading edge of ea. Wing for aerodynamic buffet • Buffet- VS(1) +10 (clean) and VSO + 5 (dirty)

  15. Flight Controls • Yaw Damping- function of autopilot • Consists of automatic application of rudder against transient motion in YAW • YD automatically engaged w/ autopilot • Not required for flight • Can be engaged w/o autopilot by pushing YD ENGAGE sw. on autopilot • Disengaged by pressing AP/TRIM DISC on cnt’l wheel

  16. THE END

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