{
  "url": "https://openlegislation.uk/draft-air-navigation-environmental-standards-for-non-easa-aircraft-order-2008/schedule/paragraph-5",
  "json_url": "https://openlegislation.uk/draft-air-navigation-environmental-standards-for-non-easa-aircraft-order-2008/schedule/paragraph-5.json",
  "legislation": "ukdsi/2008/9780110843773",
  "legislation_title": "The Air Navigation (Environmental Standards For Non-EASA Aircraft) Order 2008",
  "legislation_url": "https://openlegislation.uk/draft-air-navigation-environmental-standards-for-non-easa-aircraft-order-2008",
  "path": "schedule/paragraph/5",
  "kind": "paragraph",
  "number": "5",
  "heading": "Noise measurement procedures for microlight aeroplanes",
  "text": "(1) For demonstrating compliance with this Section the microphone must be oriented in a known direction so that the maximum sound received arrives as nearly as possible in the direction for which the microphones are calibrated.\n(2) The microphones must be placed so that their sensing elements are approximately 1.2m (4ft) above the ground.\n(3) Immediately prior to and after each test, a recorded acoustic calibration of the system must be made in the field with an acoustic calibrator for the purposes of checking system sensitivity and providing an acoustic reference level for the analysis of the sound level data.\n(4) The ambient noise, including both acoustical background and electrical noise of the measurement systems, must be recorded and determined in the test area with the system gain set at levels which will be used for aeroplane noise measurements.\n(5) If aeroplane sound pressure levels do not exceed the background sound pressure levels by at least 10dB(A), approved corrections for the contribution of background sound pressure level to the observed sound pressure level must be applied.",
  "extent": null,
  "status": null,
  "version": "current",
  "annotations": [],
  "outstanding_effects": [],
  "provenance": {
    "source": "legislation.gov.uk",
    "source_url": "https://www.legislation.gov.uk/ukdsi/2008/9780110843773/schedule/paragraph/5",
    "retrieved_at": "2026-10-30T15:15:52.411184+00:00"
  },
  "licence": "Open Government Licence v3.0",
  "licence_url": "https://www.nationalarchives.gov.uk/doc/open-government-licence/version/3/",
  "attribution": "Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives."
}