To instruct the student on getting a medical certificate and to introduce the student to the fundamental medical factors particular to flying.
Getting a medical certificate, the "IM SAFE" checklist, the hypoxia, hyperventilation, ear and sinus problems, spatial disorientation, motion sickness, carbon monoxide poisoning, effects of alcohol and drugs, nitrogen buildup from scuba diving, and fatigue.
All ground. About 30 minutes.
Go through the subjects listed and assure student understanding. Answer questions and give appropriate references.
Attend to explanation, answer questions. Ask questions.
Objective: To instruct the student on getting
a medical certificate and to introduce the student to the fundamental
medical factors particular to flying.
Materials: Jeppesen pictures
INTRODUCTION: Attention/motivation: (2minutes)
When I was in the Peace Corps, I flew to visit my girlfriend in planes that were of dubious airworthiness, but I was always more concerned about the pilots. One day, the door of the cockpit opened by accident and an empty vodka bottle went rolling down the aisle. Question: would drinking on a plane be legal for a pilot in the U.S.?
How about taking antihistamines?
How about having a heart murmur?
How do you know if you're medically fit to fly?
Are there problems you may encounter in the air, that you don't see on the ground? Try this: breathe out, and hold your breath. How long can you do it? Well, how much oxygen do you think there is in the air at 45,000 feet? (The Payne Stewart crash.)
DEVELOPMENT: Overview and explanation: (30 minutes)
I. Getting a medical:
Private pilot: third-class medical. Three years if under 40; two years if over.
Commercial pilot: second-class medical. One year.
ATP: First-class medical. Six months.
Q: Where do you get one? A: from an FAA-approved physician. We have a list.
Q: Can you get a medical certificate if you have a deficiency? Yes: Ask the FSDO.
II. The "IM SAFE" checklist
Illness, Medication, Stress, Alcohol, Fatigue, Eating
III. Aeromedical conditions
1. Hypoxia and carbon monoxide poisoning
Symptoms (may be hard to recognize before reactions are affected): euphoria, impaired judgment and reaction time, headache, drowsiness, dizziness, tingling fingers and toes, numbness, cyanosis (blue fingernails and lips), limp muscles.
Time of useful consciousness:
20,000 MSL 30 minutes
22,000 MSL 5 to 10 minutes
30,000 MSL 1 to 2 minutes
40,000 MSL 15 to 20 seconds
a. Hypoxic: inadequate oxygen supply, as in our breathe-out
b. Hypemic: Inability of blood to carry oxygen, mostly as a result of inhalation of carbon monoxide (including from cigarette smoke).
c. Stagnant: Poor blood circulation. In aircraft this can happen through G forces or cold.
d. Histotoxic: Inability of cells to use oxygen, mostly from alcohol or drug use.
Carbon monoxide can come in through the heating system. If you ever smell exhaust, or suspect that carbon monoxide is coming in the cabin, turn off the heater, open windows and vents, use supplemental oxygen if available, and land as soon as possible. CO can stay in the body for 48 hours.
Q: What might hypoxia do to your flying? How can you prevent it? What corrective action should you take if you experience symptoms?
Too little CO2 in the body results in distruption of normal breathing, resulting in symptoms like that of hypoxia: drowsiness, dizziness, shortness of breath, cyanosis, plus feelings of suffocation, paleness, clammy skin, muscle spasms. It's usually triggered by stress (fear, anxiety), and passengers are susceptible. Corrective actions to slow breathing and increase CO2: talk aloud or breathe into a paper bag.
Q: Summarize causes and corrective measures for hyperventilation.
3. Middle ear, sinus, toothache conditions
The difference between atmospheric pressure and pressure in the ear can cause discomfort. Normally the Eustachian tube will open to equalize the pressure. This can be assisted by chewing, yawning, swallowing, or using the Valsalva maneuver. A cold, infection, or sore throat can make equalization more difficult, which can be painful or even dangerous to the eardrums. Minor congestion can be combated with medications or drops or sprays, but check with your physician. (Falling asleep at the yoke is bad.)
Q: What measures should you try if you feel your ears are blocked?
Kinesthetic sense is unreliable, because the body can't tell the difference between gravity and G-loads. Visual illusions (e.g. at night) can make it worse. You'll find out all about this when we do hood work.
Vestibular disorientation comes from forces on the hair cells of the three semicircular canals in your inner ear. (Show picture)
a. Coriolis illusion: moving the head quickly creates an illusion of rotating or turning
b. Graveyard spiral: prolonged constant-rate turn may be interpreted as wings-level descent.
c. Leans: recovery to a bank is interpreted by inner ear as a roll in the opposite direction
d. Somatogravic illusion: acceleration feels like nose-high, deceleration like a dive
e. Inversion illusion: change from climb to level feels like tumbling backward
f. Others: autokinesis, haze, false horizons, empty field myopia, runway slope/width.
Q: What's the answer to all of these illusions? A: Check, and believe, your instruments, not your body.
5. Motion sickness
You probably know these symptoms. It's just like being car sick, and the source is the same: the brain is receiving conflicting signals from the eyes, body, and inner ear. (This is why reading in the car makes it worse.) You can become inured to this over time, but your passengers may not. It's probably best not to mention this to them before you get in the plane, but do carry sickness bags with you. Corrective measures: open fresh air vents, take deep breaths, put the head back and close eyes, focus on things outside the plane.
Q: The causes are of no interest to your passengers. What will you tell them if they start to feel sick? Are you carrying motion sickness bags with you?
6. Alcohol and drugs
MM-Kay, drugs are bad, mm-kay. You shouldn't do drugs. Alcohol is bad; you shouldn't drink alcohol, mm-kay
No, but seriously: what are the FARs concerning alcohol? Eight hours bottle to throttle, and not have a blood alcohol above .04. (If you have a blood alcohol level of .04 after not drinking for eight hours, you were in sorry shape indeed, and the hangover, as well as your better judgment, should keep you from flying.)
The FARs also indicate that if you're taking any medications that you believe make you unsafe to fly, then it's ILLEGAL for you to fly.
Q: Does the name, "John Denver" mean anything to anyone around here?
7. Scuba Diving
Nitrogen buildup is unavoidable and can cause the bends (decompression sickness).Before going to 8,000 MSL, wait 8 hours after a dive that has not required a decompression stop, and 24 hours after a dive that has required a controlled ascent (decompression stop). To go higher, wait 24 hours after any dive.
Going to altitude can produce symptoms that are particular to flying. It's good to review them periodically and know the corrective measures, both for your own sake, and for that of your passengers.