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  2. NIOSH air filtration rating - Wikipedia

    en.wikipedia.org/wiki/NIOSH_air_filtration_rating

    During the COVID-19 pandemic, the mask and respirator market rapidly grew, along with counterfeit respirators. [1] NIOSH, on behalf of the Department of Health and Human Services, filed a trademark application on June 17, 2020, for various 42 CFR 84 trademarks, including the N95, allowing NIOSH to enforce rules on counterfeit masks outside of rules defined in 42 CFR 84.

  3. Terrain awareness and warning system - Wikipedia

    en.wikipedia.org/wiki/Terrain_awareness_and...

    Findings from these early studies indicated that many such accidents could have been avoided if a GPWS had been used. As a result of these studies and recommendations from the U.S. National Transportation Safety Board (), in 1974 the FAA required all 14 CFR 121 (Part 121) certificate holders (that is, those operating large turbine-powered airplanes) and some 14 CFR 135 (Part 135) certificate ...

  4. Single Audit - Wikipedia

    en.wikipedia.org/wiki/Single_Audit

    In the United States, the Single Audit, Subpart F of the OMB Uniform Guidance, is a rigorous, organization-wide audit or examination of an entity that expends $750,000 or more of federal assistance (commonly known as federal funds, federal grants, or federal awards) received for its operations.

  5. Radiotelephony procedure - Wikipedia

    en.wikipedia.org/wiki/Radiotelephony_procedure

    Radio call signs are a globally unique identifier assigned to all stations that are required to obtain a license in order to emit RF energy. The identifiers consist of from 3 to 9 letters and digits, and while the basic format of the call signs are specified by the ITU-R Radio Regulations, Article 19, Identification of stations, [5] the details are left up to each country's radio licensing ...

  6. Slow moving vehicle - Wikipedia

    en.wikipedia.org/wiki/Slow_moving_vehicle

    A slow moving vehicle (or SMV) is a vehicle or caravan of vehicles operated on a street or highway at speeds slower than that of other motorized traffic.. The term "slow moving vehicle" is generally applied to equipment and vehicles such as farm equipment (including tractors), construction equipment, trucks towing trailers, or any such vehicles which cannot operate above a specified speed.

  7. Supplemental air carrier - Wikipedia

    en.wikipedia.org/wiki/Supplemental_air_carrier

    While US regulations regarding economic aspects of airlines use the word "charter" (e.g. 14 CFR Part 380—Public Charters), "supplemental" is still present in regulations concerning operational matters (e.g. 14 CFR Part 121—Operating Requirements: Domestic, Flag, and Supplemental Operations).

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