Flight Controls Flashcards
Describe the function of the Stabilizer (STAB) Trim Cutout Switches, AUTO position.
- Supplies hydraulic power for stabilizer trim
- Shuts off related system hydraulic power if unscheduled trim detected.
Note:FCOM, VOL 2; 9.10.2
What surface component is moved when stabilizer trim inputs are made?
- Leading edge of the movable horizontal stabilizer
- Stabilizer trim varies the angle of incidence of the horizontal stabilizer.
Note:FCOM, VOL 2; 9.20.3
State what occurs when the Stabilizer Trim CUTOUT Switches are in CUTOUT.
• Shuts off related hydraulic power to stabilizer trim.
Note:FCOM, VOL 2; 9.10.2
Describe the function of the alternate trim switches.
- The switches provide trim commands through a separate control channel.
- The switches provide an increased range of stabilizer trim travel.
Note:FCOM, VOL 2; 9.20.4
How do the FMCs calculate correct stabilizer trim greenband?
- They use calculated CG, and
- The calculated gross weight, and
- The takeoff thrust derate selection.
Note:FCOM, VOL 2; 9.20.4
How does the aircraft provide a crosscheck to ensure the correct greenband has been displayed?
• A nose gear oleo pressure switch position is compared to the calculated greenband.
Note:FCOM, VOL 2; 9.20.4
What is the effect on stabilizer trim if the control wheel stabilizer trim switches are used while the autopilot is engaged?
• If a single autopilot is engaged, the autopilot will disengage and the
stabilizer trim will move in the desired direction.
• If multiple autopilots are engaged, the control wheel stabilizer trim
switches are inhibited.
Note:FCOM, VOL 2; 9.20.5
State the effect on the autopilots and stabilizer trim, if the alternate trim switches are used with any number of autopilots engaged.
- The alternate trim switches override autopilot trim commands.
- The alternate trim switches do not cause autopilot disengagement.
Note:FCOM, VOL 2; 9.20.5
How many spoiler panels are provided?
• 6 spoiler panels on each upper wing
Note:FCOM, VOL 2; 9.20.11
Which spoiler panel does not function as a flight spoiler?
• Inboard spoiler on each wing
Note:FCOM, VOL 2; 9.20.7
Which spoiler panels function as speedbrakes in flight?
• The four inboard panels on each wing
Note:FCOM, VOL 2; 9.20.11
Which spoiler panels function as ground spoilers when on the ground?
• All six spoiler panels on each wing
Note:FCOM, VOL 2; 9.20.11
Which spoiler panel is displayed on the EICAS status display?
• 4th spoiler panel in from the wingtip on the left wing.
• (this panel functions as a flight spoiler, speedbrake, & gnd spoiler)
• the outermost panel on the right wing (flight spoiler and ground spoiler
only, and therefore, speedbrake extension is not displayed on the right
wing’s spoiler position indicator)
Note:FCOM, VOL 2; 9.20.12
Which spoiler panels are extended with the speedbrake lever in the flight detent position?
- The two inboard spoilers on each wing extend to mid-travel.
- The two middle spoiler panels on each wing extend to full travel.
Note:FCOM, VOL 2; 9.20.12
When do the spoiler panels extend to the UP position during landing, if the speedbrake lever is ARMED?
- Thrust levers 1 and 3 near idle
- Main landing gear touch down.
Note:FCOM, VOL 2; 9.20.12
When do the spoiler panels extend to the UP position during landing if the speedbrake lever is NOT Armed?
- Thrust levers 1 and 3 near idle
- Main landing gear on the ground
- Reverse thrust levers 2 or 4 pulled up to the idle detent
Note:FCOM, VOL 2; 9.20.12
Since the speedbrake lever is in the DN position during takeoff, what action provides an automatic spoiler function for RTO?
• Reverse thrust levers 2 or 4 pulled to the idle detent.
Note:FCOM, VOL 2; 9.20.12
Which elevator panels are displayed on the Surface Position Indicator?
• Left and right outboard elevator positions
Note:FCOM, VOL 2; 9.10.14; 9.20.2
What can you do if you lose elevator control due to a jam?
• When significant manual force is applied to the control column, shear outs between the inboard and outboard elevators allow elevator control to be regained
Note:FCOM, VOL 2; 9.20.2
Describe the elevator feel system.
- Mechanism provides artificial feel at control columns.
- Force increases as airspeed increases
- If both hydraulic systems 2 and 3 fail, mechanical springs provide feel force. Feel force is no longer a function of airspeed.
Note:FCOM, VOL 2; 9.20.2
For go-around protection, what action drives the speedbrake lever to the DN position?
• Thrust lever 1 or 3 advanced from the idle position, regardless of whether ground spoilers were automatically or manually selected.
Note:FCOM, VOL 2; 9.20.12
How does the aileron lockout system work, and what is its purpose?
• How it works: Locks the outboard ailerons in the neutral position at 238
knots
• Purpose: Permits full travel of the outboard ailerons at low airspeeds,
and
• Prevents over-controlling at high airspeeds, and
• Provides the required roll authority at low airspeeds.
Note:FCOM, VOL 2; 9.20.7
What would happen if you use aileron trim with the autopilot engaged?
- The aileron neutral point is repositioned.
- When the autopilot is disengaged, the wheel and ailerons move to the repositioned aileron neutral point.
- The airplane responds with roll proportional to the amount of aileron trim input.
Note:FCOM, VOL 2; 9.20.7
How do the rudder ratio changers work?
- Rudder ratio changers gradually reduce each rudder surface’s response to pedal inputs as airspeed increases.
- The system protects the vertical tail from stresses caused by large rudder surface deflections at high airspeeds.
Note:FCOM, VOL 2; 9.20.9
