AP Flashcards
Define Human Factors
Human Factors is concerned to optimize the relationship between people and their activities, by the systematic application of human sciences, integrated within the framework of systems engineering.
In modern aviation, human factors have historically accounted for what percentage of accidents?
60-80%
What are the 5 SHELL model components
Software, Hardware, Environment, Liveware, and you
What is the standard lapse rate?
2 degrees C every 1000’
What is the atmospheric composition?
78% Nitrogen, 21% Oxygen, 1% other
Name the 3 Physiological Divisions of the Atmosphere and their altitudes
SL - 10000’ (Physiological Zone)
10000’ - 50000’ (Physiologically Deficient Zone)
50000’ and above (Space Equivalent Zone)
Dalton’s Law of Partial Pressure
This principle explains how exposure to a high ambient altitude can reduce the available oxygen. Nitrogen takes up more space at lower pressure making oxygen less available. PN2, PO2, PCO2
Boyle’s Law
This principle explains why a balloon expands as it ascends and also why a volume of air expands when trapped in a body cavity when the pressure is reduced around it.
Henry’s Law
This principle explains why nitrogen bubbles may come out of solution in body tissues during ascent. The nitrogen bubbles can lead to altitude-induced decompression sickness. Think the bends (DCS)
Ideal Gas Law
Think about temp changes with volume. This is the cold aerosol can law.
Gaseous Diffusion
A gas will diffuse from an area of higher concentration or pressure to an area of lower concentration. the physiological significance of this law relates to the transfer of gases between the blood or other body fluids and the tissues they contact.
Phases of Respiration
Ventilation, Diffusion (1), Transportation, Diffusion (2), Utilization
Name the 4 types of hypoxia
Hypoxic, Histotoxic, Hypemic, Stagnant
What is the most important factor in the control of ventilation under normal conditions?
PCO2
What is the normal breathing rate of an average adult?
12 – 16 breaths per minute
What is the main function of red blood cells?
The primary purpose of the red blood cell (RBC) is to transport O2 and CO2.
passive component of respiration
exhalation
Circulatory system components
Heart Arteries Veins Capillaries
Aerospace factors affecting the delivery of O2
Altitude, G-Forces, Toxic Gases, Dehydration
Define Hypoxic Hypoxia
when there is a reduction of the PO2 in the lungs
Name several factors that affect the development of hypoxic hypoxia
Cabin altitude
Climb rate
Duration of exposure
Individual tolerance
Physical fitness and activity
Self imposed and environmental stress
Primary Advantage of pressurization
Hypoxia Prevention
What is pressure breathing?
When inhalation becomes passive and exhalation becomes active. Happens at 40000’. 100% O2 is no longer enough. must be pressurized.
Slow Decomp Time Range
greater than 15 secs
Rapid Decomp Time Range
.5 < 15 secs
Explosive Decomp Time Range
.2 < .5 secs
Anatomic Blindpsot
natural, born with it.
Physiologic Blindspot
At the fovea (night blindspot)
Types of vision
Photopic (day), Mesopic (dusk/dawn), Scotopic (night)
PLF (parachute landing fall)
balls of feet, side calf, side thigh, butt, shoulders