United States Department of Transportation
i
Comparison of Protective Breathing Equipment Performance at Ground Level and 8,000 Feet Altitude Using Parameters Prescribed by Portions of FAA Action Notice A-8150.2: Final Report
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1989-06-01
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[PDF-809.75 KB]
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Alternative Title:Comparison of protective breathing equipment performance at ground level and 8,000 feet altitude using parameters prescribed by portions of FAA action notice A-8150.2.
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Abstract:Two types of crewmember protective breathing equipment (PBE) were performance tested for compliance with Action Notice A-8150.2 at ground level (-1,300 feet) and 8,000 feet altitude. PBE #1 was a "hood with oral-nasal mask," which used potassium superoxide to remove carbon dioxide and produce its oxygen supply. PBE #2 was a "hood only," which contained lithium hydroxide to absorb carbon dioxide and compressed oxygen cylinders to supply breathable air. The parameters tested were PBE oxygen and carbon dioxide levels, temperature, and breathing resistance-pressure. Five units of each PBE type were subjected to testing, for within-PBE comparisons each type of unit was worn by the same human subjects at both altitudes. Relatively little difference in PBE performance was obtained at the different altitudes for both types of PBE #2, internal temperature was higher for PBE #2 than PBE #1, and exhalation pressure was greater at ground level than at 8,000 feet for PBE #1. The results indicate that both types of PBE performed adequately for the intended purpose at either altitude, but further testing would be necessary to certify PBE to meet additional requirements, such as use at altitudes above 8,000 feet.
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