PLT501: Turbulence
What code PLT501 covers, why the FAA tests it, and how to study Turbulence before your checkride.
Recall turbulence - types / characteristics / reporting / corrective actions
What this means for your checkride
Turbulence is irregular motion of the air. It comes from several sources: convective currents rising from uneven heating, mechanical mixing as wind flows over terrain and buildings, wind shear at the edges of air masses, and clear air turbulence near the jet stream. Reports are graded light, moderate, severe, or extreme.
Turbulence affects control, comfort, and structural loads, so the FAA tests whether you can identify its source, report intensity correctly, and take the right corrective action such as slowing to maneuvering speed.
Pilots equate turbulence with visible weather. Clear air turbulence and convective currents can be severe in a cloudless sky, which is why pilot reports and an understanding of the source matter.
Where to study it
Practice questions on this code
Real questions from the Aviator IQ bank that test this exact area. Answer each to see the correct choice, the full rationale, and the FAA source.
Wingtip vortices from a generating airplane are greatest under which condition?
Oral checkride defense
A code on your report is an area the examiner can revisit. Here is how an examiner might probe it, and how to explain it out loud.
Where can you expect severe turbulence around a thunderstorm?
In and near the storm, and in clear air above and downwind of it, up to about 20 miles laterally from a severe cell. I give thunderstorms a wide berth and never try to fly under or between them.
You encounter moderate turbulence in cruise. What airspeed do you fly?
I slow to maneuvering speed (Va) for the current weight, which lets the wing stall before a gust can overstress the airframe. I keep the wings level and accept altitude excursions rather than fighting them.
A code on your test report is an area of deficiency. An authorized instructor must review it with you and endorse that review before you take the practical test, and the examiner may revisit it during the oral. Study it until you can explain it out loud, not just recognize the answer.