SIFT SIFT Aviation Weather and Navigation Questions and Answers 2

Question 1

What type of fog forms when warm, moist air flows over a cooler surface, such as a cold ocean current or cold land?

Accepted Answer

Advection fog

Answer

Advection fog forms when warm, moist air is transported horizontally over a colder surface, cooling the air to its dew point.

Question 2

Which cloud layer is most associated with stable air, smooth flying conditions, and widespread low visibility?

Accepted Answer

Stratus

Answer

Stratus clouds form in stable air with little vertical motion, often producing overcast skies, drizzle, and reduced visibility without significant turbulence.

Question 3

What is the primary hazard of structural icing on a helicopter's main rotor blades?

Accepted Answer

Disruption of the rotor's airfoil shape, reducing lift and increasing drag

Answer

Ice accumulation distorts the rotor blade's airfoil profile, degrading aerodynamic efficiency and potentially causing asymmetric lift and blade imbalance.

Question 4

In aviation, IMC stands for:

Accepted Answer

Instrument Meteorological Conditions

Answer

IMC refers to weather conditions below VFR minimums, requiring pilots to fly by instruments rather than outside visual references.

Question 5

High density altitude — such as that experienced on a hot, humid day at a high-elevation airfield — affects helicopter performance by:

Accepted Answer

Reducing air density, which decreases both engine power output and rotor lift

Answer

High density altitude means thinner air, which reduces the mass of air flowing through the engine and over the rotor blades, decreasing both thrust and power.

SIFT Exam Practice Test

SIFT Exam Practice Test

SIFT SIFT Aviation Weather and Navigation Questions and Answers 2