Oxygen Systems Flashcards
What is the total pressure of atmospheric air at sea level
14.70 psi or 760 mm HG
What causes physical problems when you go higher in altitude
gasses in body and changes in atmospheric pressur
What causes hypoxia
lack of O2 in body tissue
What causes an individual to have the bends
nitrogen bubbles around large body joints
What is the normal charge for high pressure oxygen storage cylinders
1800-1850 PSI
Up to what altitude does the demand oxygen system deliver oxygen
up to 35,000 feet
At what altitude does the requirement for pressure demand equipment start
above 35,000 feet
What is the limit of continuous flow oxygen systems
30,000 feet
What is the purpose of the 180 degree disconnect swing on the CRU-60/P
to allow straight pull disconnect during ejection
Why does the E O2 port on the CRU-60/P swivel
to receive the supply connector from above or below
Why is the CRU-60/P equipped with an anti suffocation valve
to warn when disconnected from O2
Normally, how often do you preform a leak test on oxygen connector CRU-60/P
30 days
What is the first thing you check during the 60/P’s inspection
emergency oxygen inlet fitting is screwed on the elbow tight
What are the three lubricants approved to be applied on the O ring of the 60/P
krytox, braycote, halocarbon
What do you adjust the restraing chord to
1-7/16in +- 1/16
How much force is required to disconnect the male friction connector in the oxygen regulator from the mask connection
12-20 lbs
What is the maximum allowable leakage when testing the connectors
250 SCCM
EPOS is good up to what temperature
1832F or 1000C
Lithium hydroxide panels hold CO2 build up in the EPOS hood to what percentage
4% or lower
How does the passenger oxygen mask function
as a modified continuous flow system with reservoir bag
During exhalation cycle where is incoming oxygen stored
reservoir bag
What is involved in the visual inspection of the passenger oxygen mask
- check face peice for holes, cuts, tares, ect.
- check valves for damage and proper operation
- check resivor bag for damage or imperfection
- check tubing for cremp marks, damage, and kinks
- check headstrap for distortion, elasticity, and clenliness
What type of oxygen mask is the MBU-12/P
pressure demand
How is the face form of the 12/P constructed
silicone is injected into hardshell to make 1 face peice
When fitting a mask, what should you do if a crew members face length is borderline
pick most comfortable fit
How do you clean the valve assembly
swashing operational portion in alcohol
When do you preform operational check of mask?
pre/post flight and every 30 days
What type of protection does PBE provide
eye protection in oxygen deficient, smoke filled, or toxic environment
What is the min. duration of oxygen supply available when using the PBE
15 min 3.5 psi
What type inspections are required on PBE
upon issue and every 30 days
How long will the supply of oxygen last when using an emergency oxygen assembly
approximately 10 min.
What are three common types of emergency oxygen cylinder assemblies
MD-1, H-2, REDAR-K46-01
Approximately how much does the cylinder pressure drop for each degree below 70 F
3.5 psi
What occurs once the anti smoke goggles vent valve is manually pulled
oxygen bleeds out purging smoke
Who determines the frequency of dissassembly for the quick don mask
MAJCOM
How long after cleaning is the quick don oxygen valve required to dry at room temperature
15-20 min
What causes the density of the atmosphere to rise and fall
altitude
The pressure exerted by the atmosphere is greater
near the surface
What is the max psi charge of a low pressure oxygen storage cylinder
450
The continuous flow oxygen system provides sufficient oxygen for flights up to a max altitude of how may feet
30,000
The demand oxygen system provides sufficient oxygen for a max of how may feet
35,000
How many ways are there to provide sufficient pressure in the lungs to force oxygen into the blood
2
What type of manifold block is the CRU-60/P
3 way
Where does disconnect from the aircraft oxygen supply hose connector take place on the 60/P connector during ejection
lower intake port
How often is an inspection done on the 60/P
30 days
What is the max length that the excess restraint chord can be after being trimmed when it is replaced in the 60/P connector
1/4 in
How many lbs should the friction disconnect force be when checking the 60/P oxygen regulator to the mask connection
12-20 lbs
What is the max SCCM leakage rate allowed during the low range leak test of the 60/P
2500
How many liters of oxygen are contained in the single oxygen cylinder within the emergency oxygen passenger system (EPOS)
18
What is the purpose of the breathing valves located in the valve body of the passenger oxygen mask
provide and anchor for the head strap
What is the max number of days between inspection intervals for passenger oxygen masks that are used in non fixed environments
90
The individual harness adjustment straps are attached to the MBU-12/P oxygen mask with what
capped T nuts and a self locking screw
How long is the MBU-12/P oxygen mask hose
17.5 in
What type of cord is used to tack the buckles on the MBU-12/P
type IVB, 8/4 double waxed
What prevents oxygen from being released accidentally from the emergency oxygen assembly
caution tag with pin
The Scott 358 series folding quick don mask assembly is secured to the wearer’s face with what
a spring loaded telescopic mounts on a suspension assembly
