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Aeromedical

IFR flight removes the visual horizon that vision uses to override the inner ear's lies. What's left — semicircular canals, otoliths, somatosensory pressure cues — was built for ground-based motion at human walking speeds, not for three-axis flight without outside reference. This section covers the physiology that becomes load-bearing the moment the windscreen turns white: the IIMC scenario and its recovery procedure (the helicopter scenario that kills more pilots than any other), the vestibular system and how it fails in IMC, the named illusions you'll encounter, and the pressure-change effects that come with altitude work.

Study tools for this topic:
📇 Flashcards 📝 Quiz 📅 Training Plan

The marquee scenario

Helicopter IIMC Recovery

Inadvertent IMC kills helicopter pilots more often than any other physiology-related cause. Recovery procedure (Aviate–Climb–Communicate–Comply), Kobe Bryant accident analysis, training to make it reflexive, and prevention via personal weather minimums.

The physiology behind it

IMC & the Vestibular System

The three orientation systems and why only vision works in VMC. Anatomy of the canals and otoliths, three SD types (unrecognized, recognized, incapacitating), and the discipline of trusting the instruments.

Vestibular & Visual Illusions

ICEFLAGGS — the nine vestibular illusions you'll be tested on. GARRF — the visual approach illusions. Each illusion's mechanism, recognition cue, and recovery action.

Pressure Changes — Ear & Sinus Blocks

Eustachian tube anatomy, climb vs descent dynamics, equalization techniques (Valsalva, Toynbee, swallowing). Why head colds ground you. Plus DCS, gas expansion, and aerodontalgia.

Foundations — covered on the PPL aeromedical track

The foundational human-factor physiology applies to every flight, not just IFR. Rather than duplicate the content here, IFR builds on top of the PPL aeromedical pages — review them if you're new to the topic.

PPL: Fundamentals & IMSAFE

Self-assessment, PAVE, the 5 hazardous attitudes — the framework that lives upstream of every IIMC accident.

PPL: Hypoxia & Altitude

4 mechanisms, 4 stages, FISH RIB, § 91.211, full TUC table.

PPL: Hyperventilation & Stress

Anxiety-driven over-breathing in the workload of IMC. Differential vs hypoxia.

PPL: Spatial Disorientation

The PPL-level SD framework — vestibular anatomy, three SD types, the named illusions in summary.