Performance evaluation of the Puritan-Bennett Crew-member portable protective breathing device as prescribed by portions of FAA Action Notice A-8150.2.
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Performance evaluation of the Puritan-Bennett Crew-member portable protective breathing device as prescribed by portions of FAA Action Notice A-8150.2.

  • Published Date:

    1989-05-01

  • Language:
    English
Filetype[PDF-3.17 MB]


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  • NTL Classification:
    NTL-AVIATION-Aviation Safety/Airworthiness ; NTL-SAFETY AND SECURITY-Aviation Safety/Airworthiness ;
  • Abstract:
    This study was undertaken, on request, to evaluate the performance of the Puritan-Bennett portable crew protective breathing device for contaminant leaks. O2, CO2 levels, inhalation/exhalation pressure, and inhalation temperature. Tests were conducted in the facilities of the FAA Civil Aeromedical Institute (CAMI) in Oklahoma City, OK, (test chamber and altitude chamber). The duration and workload profile are described in FAA Action Notice A-8150.2. The test sequence followed an iterative process in which problems were identified, modifications made to correct deficiencies, and the device retested until problems could be solved. The test sequence was as follows: First, the neck seal material was not elastic enough and a more suitable material was identified and substituted; Second, the size of the opening of the neck seal had to be reduced to protect the smaller subjects; Third, identification of increased CO2 resulting from the occasional inversion of the exhalation valve was found, and was solved by improving the valve support design; Fourth, leaks encountered at locations other than neck seals were overcome through improved quality control for more impermeable seams and hardware seals. Thus, with adequate quality assurance, the final version of the Puritan-Bennett crewmember portable protective breathing device, as tested at CAMI, would meet the requirements of FAA's Action Notice A-8150.2 regarding contaminant leak protection O2 concentration, CO2 concentration, inhalation/exhalation pressures and inhalation temperature.
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