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.
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.
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.
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.
FCOM VOL 2; 9.20.4
How do the FMCs calculate correct stabilizer trim greenband?
• The FMC’s use the calculated gross weight,
• Centre of gravity, and
• The takeoff thrust derate selection.
- position of the nose gear oleo pressure switch is compared to calculated
green band as a cross check.
FCOM, VOL 2; 9.20.4
How does the aircraft provide a crosscheck to ensure the correct greenband has been selected?
• A nose gear oleo pressure switch position is compared to the selected greenband.
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.
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 with
any number of auto pilots engaged.
• The alternate trim switches do not cause autopilot
disengagement.
FCOM, VOL 2; 9.20.5
How many spoiler panels are provided?
• 6 spoiler panels on each upper wing
FCOM, VOL 2; 9.20.11
Which spoiler panel does not function as a flight spoiler?
• Inboard spoiler on each wing.
FCOM, VOL 2; 9.20.11
Which spoiler panels function as speedbrakes in flight?
• The four inboard panels on each wing.
FCOM, VOL 2; 9.20.11
Which spoiler panels function as ground spoilers when on the ground?
• All six spoiler panels on each wing.
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)
FCOM, VOL 2; 9.20.11
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.FCOM, VOL 2; 9.20.11
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, and
- Main landing gear touch down.FCOM, VOL 2; 9.20.11
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, and
- Main landing gear on the ground, and
- Reverse thrust levers 2 or 4 pulled up to the idle detentFCOM, VOL 2; 9.20.11
Since the speedbrake lever is in the DN position during takeoff, what action provides an automatic spoiler function for RTO?
- Main gear on the ground, and
- Thrust levers 1 and 3 near idle, and
- Reverse thrust levers 2 or 4 pulled to the idle detent.FCOM, VOL 2; 9.20.11
For go-around protection, what action drives the speedbrake lever to the DN position?
• Thrust lever 1 or 3 advanced from the closed position,
regardless of whether ground spoilers were automatically
or mechanically selected.
FCOM, VOL 2; 9.20.11
Which elevator panels are displayed on the Surface Position Indicator?
• Left and right outboard elevator positions.
FCOM, VOL 2; 9.10.13; 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.
FCOM, VOL 2; 9.20.2
Describe the elevator feel system?
• Elevator feel and centering mechanism provides artificial feel in the
control column.
• 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.
FCOM, VOL 2; 9.20.2
How does the aileron lockout system work, and what is its purpose?
• How it works: Locks the outboard ailerons in the neutral position
at airspeeds above 238kts.
• 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.
FCOM, VOL 2; 9.20.7
What would happen if you use aileron trim with the autopilot engaged?
• The aileron neutral point is repositioned, by the feel and trim mechanism.
• 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.
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.
FCOM, VOL 2; 9.20.9
What is the purpose of the yaw dampers?
- To improve airplane lateral and directional stability, and
- To provide turn coordination.FCOM, VOL 2; 9.20.10
YAW DAMPER ON/ INOP switch positions?
ON - Yaw damper is powered. INOP light illuminated. - Yaw damper switch is off, - Yaw damper is in operative, or - IRU’s still in alignment mode. Remains illuminated until the first IRU is aligned.
