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Exam of 15 pages for the course ATPL at ATPL (ATPL questions)
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ATPL questionsWhat are the forces acting on an aircraft in flight? - answer Drag. Thrust. Lift and Weight
What is direct lift control? - answer The elevator / stabilizer provide the direct lift control.
What are high lift devices? - answer Trailing edge flaps. Leading edge flaps. Slots
Define the two major types or Drag. - answer Profile and induced drag which equals
total drag
What are high drag devices? - answerTrailing edge flaps, spoilers, landing gear, revere
thrust, braking parachute.
How do you prevent span-vise airflow on a wing especially swept wing? -
answerFences, vortex generators
What is the purpose vortex generators and fences? - answerTo reduce spanwise airflow
and thereby reduce its effects
What are winglets and how do they work? - answerWinglets are aerodynamically
efficient surfaces located at the wing tips. They are designed to reduce induced drag.
They dispense the spanwise airflow from the upper and lower surfaces at different
points.
How does a forward center of gravity affect the stall speed? - answerA center of gravity
forward of the center of pressure will cause a higher stall speed
What advantages does an aircraft gain from a swept swing? - answerHigh mach cruise
speeds, stability in turbulence.
Where does a swept wing stall first? - answerA simple swept or tapered wing will stall at
the wing tip first.
Explain speed stability. - answerIt's the behavior of the speed after a disturbance at a
fixed power setting
What is Mach Number - answerMach number is a true airspeed indication, given as a
percentage relative to the local speed of sound.
What is the critical Mach number (mcrit)? - answerMcrit is the aircraft's mach speed at
which the airflow over a wing becomes sonic.
, What is Mach tuck? - answerIs the nose down pitching moment an aircraft experiences
as it passes it's critical mach number
What is the purpose of a mach trimmer? - answerA Mach trimmer is to automatically
compensate for Mach tuck above Mcrit.
What are the affects of compressibility? - answerThe effect of air being compressed
onto a surface resulting in an increase in density and thus dynamic pressure rises
above its expected value.
What changes the aircrafts angle of attack at the stall? - answerThe movement of the
center of pressure point at the stall causes a change in the aircraft's angle of attack
What happens to the stall speed at very high altitudes? - answerMach number
compressibility effect on the wing results in a higher EAS (actual equivalent airspeed),
compressibility error on the IAS increases the stall speed
What is super stall? - answerIs a stall from which the aircraft is unable to recover.
What is Dutch roll? - answerDutch roll is an oscillatory Instability. It is the combination of
yawing and rolling motions
What causes Dutch roll? - answerSwept wings
What is the three purposes of spoilers? - answerRoll control, Air speed brakes, and
ground lift dumpers
What our Krueger flaps? - answerKrueger flaps are leading edge wing flaps used to
increase the wing chamber
How do flap affect takeoff ground run? - answerA higher flap within the take off range,
will reduce the takeoff' ground run for a given aircraft weight.
What's the purpose is of yaw and roll dampers? - answerTo prevent Dutch roll and
coordinate turns
What are the four reasons for a variable-incident tailplane / stabilizer? - answerProvide
a balancing force for a large C of G range, cope with large trim changes. Provide
balancing force for a large speed range, reduce elevator trim drag.
What is a mass balance? - answerIt is another form of aerodynamic balance control on
a control surface.
What are active controls? - answerA surface that moves automatically / actively in
response to non-direct inputs
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