High Altitude Flashcards
Oxygen required if at this altitude more than 30 minutes
12,500 - 14,500 MSL
Oxygen always required for crew above this altitude
14,000 MSL
Oxygen provided to passengers above this altitude
15,000 MSL
What is required above FL250?
10 minute supplemental oxygen supply for each occupant. (In addition to other oxygen requirements, this is in case of the need for an emergency descent)
What is required above FL350?
One pilot at the controls wearing and using an oxygen mask. Or, if under FL410, two pilots at controls both with access to quick-donning masks.
Continuous flow oxygen
-Most common in GA
-Not sealed
-Reservoir bag collects oxygen during exhale
Diluter demand oxygen
-oxygen supplied only when inhaling
-may be pure O2 or mix with cabin air
-sealed
-useful up to 40,000 MSL
Pressure demand oxygen
-oxygen supplied under pressure
-allows lungs to be pressurized
-useful above 40,000 MSL
Pressure demand oxygen
-oxygen supplied under pressure
-allows lungs to be pressurized
-useful above 40,000 MSL
Need for aviators oxygen?
Doesn’t have moisture content (unlike medical oxygen) so it won’t freeze at altitude
Oxygen storage concerns
-within appropriate PSI limits
-fire/combustion
-temperature may decrease pressure reading on tanks even though oxygen amount is sufficient
Explosive decompression
-comes from damage to cabin it pressure system
-less than a second
-causes internal damage, dust, debris, cabin fog
Rapid decompression
-less dangerous than explosive decompression
-lungs have time to decompress, less damage
-lose consciousness quickly
Slow decompression
-may go undetected
-hypoxia
-decompression sickness
-wear mask and descend quickly
Differential pressure
Difference between cabin altitude and ambient altitude
