Depressurisation Flashcards
Estimated time of useful consciousness
43000 feet
10 seconds
Estimated time of useful consciousness
40,000 feet
15 seconds
Estimated time of useful consciousness
35,000 feet
45 seconds
Estimated time of useful consciousness
30,000 feet
1 minute
Estimated time of useful consciousness
25,000 feet
3 minutes
Estimated time of useful consciousness 20,000 feet
10 minutes
What people are more likely to suffer from hypoxia
-heart conditions
-respiratory illness
-cold + fatigue
-blood disorders
-use of alcohol drugs, heavy smokers
Early signs of hypoxia
-similar to being intoxicated with alcohol
-reduced night vision
Mild signs of hypoxia
Breathlessness, sleepiness, difficulty in concentration, indifference, unwarranted self confidence, increased pulse rate
Moderate/severe hypoxia
Blue lips + finger tips (cyanosis)
Euphoric
Unconscious
Impaired vision and memory
Headache
Breathlessness
Erratic
Slowed thinking
Acting drunk
Etc
Visible indications of hypoxia
Blue lips and fingertips
Laboured breathing
Gas expansion, sites for potential trapped gases include:
Ears
Sinuses
Abdomen/intestines
Teeth
How can you relieve gas expansion?
Swallow
Yawn
Suck a sweet
Cry
Blow nose
Hold and exhale gently through nose
Symptoms of decompression sickness
Joint pains
Chest pains
Blotchy/marbled skin rash
Visual and mental impairment
Dizziness and confusion
Collapse/unconsciousness
Oven fire what does ski stand for
Switch of electrical power supply
Keep door closed
Implement basic fire drill
Nearest oxygen mask
Don
Nearest seat
Occupy
Seatbelt
Fasten
Com station
Proceed
Follow up duties
Carry out
Crew oxygen
Use
What is explosive depressurisation
May be caused by a collapse of a door or damaged aircraft structure
What is sudden depressurisation
Caused by a failure of pressurisation system which leads to obvious loss of cabin pressure
What is gradual depressurisation
A slow pressurisation leak or air conditioning failure
What may occur during depressurisation
-initial effects of hypoxia
-sudden boiling of liquids
-pain in ears and sinuses
-mist forming in cabin(not smoke)
-air becoming cold and thin
-need to breath rapidly
-disturbance of dust and loose papers
-discomfort or pain due to pressure of gasses trapped in the body
Should the aircraft altitude reach an unsafe level the following occurs
Psu masks drop
Cabin lighting illuminates
No smoking and fasten seatbelts
Automatic pa instructing passengers how to use oxygen
Flight deck manual oxygen deployment switch is activated as a checklist item
What is average adult respiratory rate at cabin altitudes of 5000-8000 feet
16-20 times per min
