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PLT334: Physiological Factors

What code PLT334 covers, why the FAA tests it, and how to study Physiological Factors before your checkride.

Updated September 2026 · Learning statement code · Pilot / Instructor

Official FAA learning statement

Recall physiological factors - spatial disorientation

What this means for your checkride

Spatial disorientation is losing track of your attitude and motion when you cannot see a clear horizon, because the balance senses feed the brain false cues. The fix is to trust the flight instruments over what your body reports.

Spatial disorientation is a top cause of loss-of-control accidents in low visibility, so the FAA tests its illusions and the reliance on instruments.

The common trap

New pilots believe they can feel the airplane's attitude. Without a visual horizon the inner ear lies, so instrument cross-check, not sensation, keeps you upright.

Where to study it

FAA source
Pilot's Handbook of Aeronautical Knowledge, Aeromedical Factors chapter, spatial disorientation
Read Pilot's Handbook of Aeronautical Knowledge on Aviator IQ →
Before your checkride (14 CFR 61.39)

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.