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Aeromedical Factors
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4
D
D
35
Runway
Safet
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Area
for 4
Ru
nw
ay S
afet
y A
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35
4
Note: Because of the relative short Taxiway D stub, the hold markings are not SEQUENCED in the “usual order” as one would expect to see exiting either runway.
Following landing, blue aircraft has been instructed to “hold short” Runway 4. Blue aircraft is expected to hold at this position even if the aircraft has not cleared the landing runway and remains inside the safety area for Runway 35. Follow ATC instructions.
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Medical Certificate
• Must possess valid and appropriate medical certificate to exercise the privileges of your pilot certificate
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Medical Certificate
• You are prohibited from performing crewmember duties while you have a known medical condition that would make you unable to meet the standards for your medical certificate
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Personal Checklist• I - Illness
• M - Medication
• S - Stress
• A - Alcohol
• F - Fatigue
• E - Emotion or Eating
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Hypoxia
• Name four types of hypoxia.
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Hypoxia
• Hypoxic Hypoxia
• Hypemic Hypoxia
• Stagnant Hypoxia
• Histotoxic Hypoxia
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Hypoxia
• Hypoxic Hypoxia - Inadequate supply of oxygen - altitude
• Hypemic Hypoxia - Inability of the blood to carry oxygen - Smoking - CO
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Hypoxia
• Stagnant Hypoxia - Inadequate circulation of oxygen - Heart problems - shock
• Histotoxic Hypoxia - Inability of the cells to effectively use oxygen - alcohol - drugs
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Symptoms
• Headache, drowsiness, dizziness and either a sense of well-being or belligerence
• Periphery of the visual field turns gray
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Symptoms
• Blue color in lips and fingernails
• Unconsciousness
• Death
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Hyperventilation
• Abnormal increase in the amount of air breathed in and out flushes from the lungs and blood much of the carbon dioxide needed to maintain the proper degree of blood acidity
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Hyperventilation
• Control breathing - breath into a paper bag - talking, singing or counting aloud
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Symptoms• Dizziness, tingling of the fingers
and toes, hot and cold sensations, drowsiness, nausea and suffocation
• Disorientation and painful muscle spasms, followed by unconsciousness
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Carbon Monoxide• Colorless, odorless and tasteless
gas
• Affinity of the hemoglobin in the blood is greater for carbon monoxide than oxygen
• Effects are cumulative
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Carbon Monoxide
• Susceptibility increases with altitude
• Aircraft heater work by air flowing over the exhaust manifold
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Symptoms• Feeling of sluggishness, being
too warm and tightness across the forehead
• Followed by headache, throbbing or pressure in the temples and ringing in the ears
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Symptoms
• Leads to severe headache, weakness, dizziness and dimming of vision
• Loss of muscle power, vomiting, coma, death
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Decompression Sickness
• Nitrogen changes from a liquid to a gas and forms bubbles in the bloodstream
• Wait at least 12 hours after a dive not requiring a controlled ascent
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Decompression Sickness
• Wait at least 24 hours after a dive requiring a controlled ascent
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Motion Sickness
• Caused by continued stimulation of the tiny portion of the inner ear that control your sense of balance
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Symptoms• Desire for food is lost
• Saliva collects in your mouth and you perspire freely
• Nausea and disorientation
• Headache and tendency to vomit
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Preventive Measure
• Open air vents
• Loosen clothing
• Supplemental oxygen, if available
• Look outside the airplane
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Preventive Measure
• Avoid unnecessary head movement
• Land as soon as possible
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Motion Sickness
• As a pilot do not take over the counter medication, since they can cause deterioration of navigation skills and tasks requiring keen judgment
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Sinus Block• Air pressure not able to equalize
between the sinuses and the nasal passage
• Caused by respiratory infection or nasal allergies producing congestion
• Usually occurs during descent
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Symptoms• Excruciating pain in frontal sinuses
above each eyebrow or in the maxillary sinuses located in each upper cheek which may make the upper teeth ache
• Bloody mucus may discharge from the nasal passages
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Ear Block
• Air pressure not able to equalize between the ears and the nasal passage by way of the Eustachian tubes
• Caused by upper respiratory infection
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Ear Block
• Swallowing, yawning, using Valsalva maneuver
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Symptoms• Severe ear pain and loss of
hearing
• Rupture of the ear drum
• Fluid accumulation in the middle ear which can become infected
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Stress
• Life Stress Management–Be knowledgeable about stress
–Take a realistic assessment of yourself
–Take a systematic approach to problem solving
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Stress–Develop a life style that will buffer
you from the effects of stress
–Practice behavioral management techniques
–Establish and maintain a strong support network
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Stress
• Cockpit Stress Management–Avoid situations that distract you
from flying the aircraft
–Reduce your workload
–In an emergency, remain calm
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Stress–Maintain proficiency in your
aircraft
–Know and respect your personal limitations
–Do not let little things bother you until they build into big things
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Stress
• Cockpit Stress Management–If flying is adding to your stress,
either stop flying or seek professional help to manage your stress within acceptable limits
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Illusions
• Can lead to spatial disorientation
• Can lead to landing errors
• Often contribute to fatal aircraft accidents
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Illusions• Leans - Correcting a banked
attitude which has been entered too slowly to stimulate the motion sensing system in the inner ear
• Creates the illusion of banking in the opposite direction
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Illusions
• Coriolis Illusion - An abrupt head movement in a prolonged constant-rate turn can create the illusion of rotation or movement in an entirely different axis
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Illusions
• Graveyard spin - recovery from a spin and create the illusion of spinning in the opposite direction. The disoriented pilot returns the aircraft to its original spin
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Illusions• Graveyard spiral - Losing altitude in a
constant rate turn. creates the illusion of being in a descent with the wings level
• The disoriented pilot will pull back on the controls, tightening the spiral and increasing loss of altitude
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Illusions• Somatogravic illusion - Rapid
acceleration during takeoff can create the illusion of being in a nose-up attitude
• The disoriented pilot will push the aircraft into a nose-low or dive attitude
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Illusions• Inversion illusion - an abrupt change
from climb to straight and level flight can create the illusion of tumbling backwards
• The disoriented pilot will push the aircraft into a nose-low attitude, possibly intensifying this illusion
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Illusions• Elevator illusion - An abrupt
upward vertical acceleration caused by an updraft can create the illusion of being in a climb
• The disoriented pilot will push the aircraft into a nose-low attitude
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Illusions• False Horizon - Sloping cloud
formations, an obscured horizon and some patterns of ground lights can create the illusion of not being aligned correctly with the actual horizon
• Leads to a dangerous attitude
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Illusions• Autokinesis - In the dark, a static
light will appear to move about when stared at for several seconds
• The disoriented pilot will lose control of the aircraft in attempting to align it with the light
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Illusions
• Size-distance illusion - When one stares at a point of light, it may appear to approach or recede rapidly
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Illusions
• Reversible perspective - At night, an aircraft may appear to be going away from you when it is actually approaching
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Illusions• Flicker vertigo - A flickering light at a
constant frequency may cause dizziness, nausea and in extreme cases convulsions and unconsciousness
• Sun shining in the propeller on approach
• Change in power can help
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Illusions
Leading to Landing Errors
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Illusions• Runway width illusions - A
wider-than-normal runway creates the illusion that the aircraft is lower than it really is
• Pilots level out too high and land hard or overshoots the runway
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Illusions
• Runway and Terrain Slopes illusion - An upsloping runway creates the illusion that the aircraft is higher than it really is
• The pilot will fly a low approach
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Illusions• Featureless Terrain illusion -
Absence of ground features when landing over water, snow or dark areas creates the illusion that the aircraft is higher than it actually is
• The pilot will fly a low approach
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Illusions• Atmospheric illusion - Rain on the
windscreen can create the illusion of greater height. Haze creates the illusion of being at a greater distance. Penetration of fog can create the illusion of pitching up.
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Illusions
• Ground lighting illusion - Lights along a straight path, such as a road can be mistaken for runway lights
• Bright runway lights and approach light systems can create the illusion of less distance to the runway.
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Vision
• Vision is the most important sense for safe flight.
• Daytime scanning - series of short, regularly spaced eye movements not to exceed 10o observed for at least one second
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Vision
• Night time - use offset viewing and scan slowly
• Avoid bright lights for at least 30 minutes prior to flight
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Vision
• How is the eye constructed?
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Vision• Cones
• Rods
• Fovea
• Off Center viewing
• Adaptation
• Oxygen