Flight Controls Flashcards
(767) Stabilizer trim settings below 1.5 units requires:
The use of manual trim levers or alternate stabilizer trim
switches (as installed)
The flight control columns and wheels are connected through jam override
mechanisms. If a jam occurs in a column or wheel, how can the pilots maintain
control?
The pilots can maintain control by applying force to the
other column or wheel to overcome the jam. When a
restricted portion of the flight controls are bypassed,
some control effectiveness may be lost
What causes the SPEED BRAKES light to illuminate and the EICAS caution message
SPEEDBRAKES EXT to display?
Speedbrakes are extended when flaps are in a landing
position or radio altitude is 800 feet or below
Alternate flap operation allows manual operation of the flaps and slats through
electric motors. Extension of the flaps and slats from UP to flaps 20 with the
alternate system requires approximately __________.
Two minutes
(767) With Flaps 30 selected and airspeed increases above 170 knots, what action
should occur?
TE flaps will retract to 20
(767) If an impending stall continues or pitch increases after both of the control
column shakers activate:
With the slats and flaps retracted, a control column
nudger/pusher will move the control columns forward
(757) Upon receiving a signal from the stall warning system:
The slats automatically extend from the midrange
(takeoff) position to the fully extended landing position.
The slats retract a few seconds after the signal is
removed.
If the UNSCHED STAB TRIM light illuminates and the EICAS caution message UNSCHD
STAB TRIM displays, what feature allows the pilot to quickly stop uncommanded trim
changes?
The control column can be used to interrupt stabilizer
trim commands. The stabilizer trim commands are
interrupted if the control column in displaced in the
opposing direction
(767) When does the Pitch Enhancement System (PES) operate automatically?
Loss of left and center hydraulics
(757) What occurs when either Alternate Flaps switch is pushed ON?
Hydraulic power is removed from both leading and
trailing edge drive systems
When are the leading edge slats extended to the landing position during normal flap
extension?
Flaps 25
When is Mach speed trim inhibited from trimming?
When electric, alternate, or autopilot trim is operating
What is the purpose of the rudder ratio system?
As airspeed increases, the ratio changer desensitizes
inputs from the pilot to reduce the rudder deflection
Which hydraulic system powers the rudder ratio system?
Left
What are the limitations if a RUDDER RATIO light is illuminated and a RUDDER RATIO
EICAS message is displayed with normal left hydraulic system pressure?
Crosswind and autoland limitation must be observed
What is the purpose of the yaw damper system?
Improves turn coordination and dutch roll damping
What does the STAB TRIM light and EICAS message indicate?
Stabilizer trimming is at half the rate
What does an UNSCHED STAB TRIM light and EICAS message indicate?
Uncommanded stabilizer movement
When does an armed speedbrake lever move to the UP position and the spoiler
panels raise after landing occur?
Both thrust levers are at idle
What is operated by the alternate flap/slat system?
Electric motors
Why should the speed brake lever be moved from ARMED to the DOWN detent if
the AUTO SPDBRK light illuminate?
To prevent inadvertent speedbrake extension in flight
Which of the following is true when the AUTO SPDBRK light is illuminated?
Speedbrakes can still be operated manually
What is indicated by an illuminated SPOILERS light and SPOILERS EICAS message?
One or more spoiler pairs are inoperative
(757) What does MACH SPD TRIM light indicate?
Mach speed trim system is inoperative
(757) What type of stall protection is installed?
Autoslats; the leading edge slats automatically move
from the takeoff position to the landing position when
the stall warning system activates
(757) If Flaps 30 is selected, what occurs if the flap load relief system is activated
above 162 knots?
Flaps retract to 25
(757) What must be used to set stabilizer trim settings below three units?
The use of manual trim levers or alternate stabilizer trim
switches (as installed)
(767) What is the stab trim rate when the Pitch Enhancement System (PES) is
operating?
0.25
(767) How does the Pitch Enhancement System (PES) operate?
The PES uses a PTU driven by the right hydraulic system
which uses trapped left trim system fluid to power
stabilizer trim
(767) What occurs when either Alternate Flaps switch is pushed ON?
Shuts off hydraulic power to selected flap or slat drive
unit(s)
(767) What type of stall protection is installed?
Control column nudger/pusher
(767) If Flaps 30 is selected, what occurs if the flap load relief system is activated
above 170 knots?
Flaps retract to 20
(767) Shortly after selecting Flaps 1, a LE non‐normal occurs, what automatic action
will take place?
Hydraulic power to only the slats is automatically shut
off
