PPL PPL Aviation Weather Services and Meteorology 3

Question 1

What is structural icing and under what conditions does it most commonly occur?

Accepted Answer

Accumulation of ice on aircraft surfaces when flying through supercooled water droplets, typically in clouds between 0°C and -20°C

Answer

Structural icing forms when supercooled water droplets (liquid below 0°C) in clouds contact aircraft surfaces and freeze, degrading aerodynamics by reducing lift, increasing drag, and adding weight.

Question 2

What is the tropopause?

Accepted Answer

The boundary between the troposphere and stratosphere, where the temperature lapse rate abruptly changes

Answer

The tropopause is the boundary between the weather-producing troposphere and the stratosphere, identifiable by an abrupt change in the temperature lapse rate (temperature stops decreasing with altitude).

Question 3

How does uneven surface heating cause convective weather?

Accepted Answer

Differential solar heating creates thermals of rising warm air that, given enough moisture, form cumulus clouds and eventually thunderstorms

Answer

The sun heats different surfaces unequally; warm air rises as thermals, cools at the dry adiabatic lapse rate, and upon reaching the dew point forms cumulus clouds that can grow into thunderstorms.

Question 4

What is a Convective SIGMET (WST) issued for?

Accepted Answer

Hazardous convective weather including tornadoes, embedded thunderstorms, severe turbulence, and severe icing associated with thunderstorms

Answer

Convective SIGMETs (WST) are issued for tornadoes, embedded thunderstorms, lines of thunderstorms, areas of severe or extreme turbulence, and severe icing associated with thunderstorm activity.

Question 5

What does a Standard Briefing from Flight Service include?

Accepted Answer

Adverse conditions, synopsis, current conditions, forecasts, winds aloft, NOTAMs, and ATC delays

Answer

A Standard Briefing provides a comprehensive picture including adverse conditions, synoptic weather, current observations, en route and destination forecasts, winds aloft, NOTAMs, and known ATC delays.

(PPL) Private Pilot Licence Practice Test

(PPL) Private Pilot Licence Practice Test

PPL PPL Aviation Weather Services and Meteorology 3