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The ATL performs sound
power level determinations in accordance with US and
international standards ANSI S12.54 and ISO 3744 as well as
measurement of emission sound pressure levels at operator and
other specified positions in accordance with ISO 11201, which
the ATL utilizes to verify compliance with Pressurized Payload
noise emission requirements in accordance with the criteria
outlined in NASA Document SSP57000. The ATL is the only
laboratory within NASA to conduct acoustic emissions verification testing in accordance with ISO 11201.
In March, 2003, the ATL was awarded NVLAP accreditation for sound power level
determinations in accordance with ANSI S12.54 and ISO 3744, and added ISO 11201
to its scope of accreditation in December, 2004. Accreditation was maintained through
March, 2007, when, as a result of a reduction in staff and changes in NASA's programmatic
focus, the ATL voluntarily suspended its accreditation.
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