Life Support and Protective Equipment Flashcards
What things determine the time required for cabin depressurization?
Volume of the cabin
Size of the opening
pressure differential
flight pressure altitude
The emergency ceiling (get me down capability only) for pressure demand oxygen equipment is:
a) 30K ft
b) 40K ft
c) 50K ft
d) 60K ft
c) 50K ft. The pressure demand valve oxygen is for 40,000 to 50,000. 50,000 is temporary (get me down). Above 50K a pressure suit is needed.
At high altitude, the mechanical problem of compression of air because of its low density, limits the utilization of the pressurized cabin to:
a) 10 miles
b) 16 miles
c) 24 miles
d) 28 miles
b) 16 miles
Limb damage during a high speed ejection is most likely to be caused by:
a) impact with aircraft structures
b) ejection through the aircraft canopy
c) high G forces during retardation
d) incorrect landing technique
e) flailing due to wind blast
e) flailing due to wind blast
Which of the following best describes the relationship between repeated parachute jumps and xray signs of degenerative arthritis among military parachutists when compared to matched controls?
a) there is no known relationship
b) There are more degenerative changes detectable in all parts of the spine
c) There are more degenerative changes in the lumbar spine
d) There are more degenerative changes in the cervical and thoracic spine but not in the lumbar spine.
d) After nearly 490 jumps degenerative changes were found in the cervical and thoracic spine but not the lumbar spine.
Cabin pressurization is based primarily on several well-defined physiologic requirements in relation to hypoxic thresholds and critical limits for the normal unacclimatized man. In terms of the alveolar oxygen tension (PaO2), breathing 100% oxygen at 40,000 feet is essentially the equivalent of breathing air at:
a) sea level
b) 8,000 feet
c) 10,000 feet
d) 12,000 feet
c) 10,000 feet
Which of the following lists the components of an oxygen system:
a) compressor, tubing, mask
b) storage container, tubing, mask
c) compressor, regulator, hose, mask
d) compresson tubing, regulator, mask
e) storage container, tubing, regulator, hose, mask
e) storage container (LOX) tubing, regulator, hose, mask
The precaution(s) which must be taken when using liquid oxygen as a storage form for the use of oxygen in aircraft is (are):
a) LOX must be stored in containers with a relief valve
b) LOX must not be allowed to come into contact with grease, oil, or other petroleum products
c) LOX must not be allowed to contact body parts
d) LOX itself must not be placed aboard aircraft even in proper containers
e) a, b, and c above
e) a, b, and c above
For positive pressure breathing to be successful:
a) the respiratory breathing cycle should remain unchanged
b) the normal respiratory breathing cycle should be accentuated
c) the normal respiratory breathing cycle should be reversed
d) both inspiration and expiration should be forceful
e) the aviator should relax and let the system do the work
c) the normal respiratory breathing cycle should be reversed. Remember, usually inhalation requires work to inhale, and exhalation is passive. Due to the positive pressure, inhalation is passive and exhaling against the pressure is active.
All of the following are characteristics of oxygen EXCEPT
a) oxygen may be toxic if breathed for a prolonged period of time
b) oxygen is highly flammable
c) liquid oxygen is a pale blue liquid
d) aviators oxygen must be 99.5% pure
e) Oxygen can exist in solid form as sodium chlorate candles
b) Technically oxygen is not flammable. It supports combustion vigorously, but it itself is not flammable.
An oxygen regulator is used to:
a) increase the oxygen system storage pressure
b) increase the percentage of oxygen going to the mask
c) store oxygen
d) decrease the percentage of oxygen going to the mask
e) decrease the pressure of the storage system to breathing pressure
e) decrease the pressure of the storage system to breathing pressure
Commercial passenger aircraft have two separate high pressure oxygen systems for the crew and for the passengers. They are:
a) diluter demand and continuous flow
b) both continuous
c) positive pressure and diluter demand
d) both diluter demand
e) both positive pressure
a) Diluter demand (the crew has a mask that is under pressure and gives a mix of ambient and 100% oxygen) and the passengers have continuous flow (no pressure).
Positive pressure breathing for altitude (PBA) is directed at:
a) get me down scenarios
b) maintaining normal sea level arterial oxygen levels
c) maintaining an alveolar oxygen concentration above 60 mmHg
d) use only above 50,000 feet
e) a and c.
e) a and c.
Aircraft pressurization systems increase the risk of:
a) hypoxia
b) bends
c) fatigue
d) rapid decompression
e) hypothermia
d) Rapid decompression- because they pressurize the cabin and create a pressure differential, there is an increase in risk for rapid decompression if the aircraft loses integrity.
