{"id":"F2006B10496","name":"AD/HS 125/57 - Flight Manual - Change to Metric Units","slug":"ad-hs-125-57-flight-manual-change-to-metric-units","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116255,"registerId":"commonwealth-F2006B10496-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 125/57 - Flight Manual - Change to Metric Units","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBritish Aerospace BAe 125 Series Aeroplanes\n\nAD/HS 125/57 Flight Manual \\- Change to Metric Units 9/81\n\nApplicability: All Hawker Siddeley HS-125 series aeroplanes.\n\nRequirement: The DoT approved flight manual shall be amended to specify quantities in the following units:\n\n    (a) weight in kilograms;\n\n    (b) distances in metres;\n\n    (c) centre of gravity limits and moment arms in millimetres;\n\n    (d) fuel and oil quantities in litres; and\n\n    (e) pressures in kilopascals.\n\nWhere the installed aircraft instrumentation is calibrated in units other than the above the flight manual shall specify both systems of units.\n\nCompliance: By 1 January 1984.\n\nBackground: It is required that all Australian aircraft be provided with airworthiness limitations and operational data in the declared metric units.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2447},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow technical scope—mandating metric unit conversion for flight manuals of a specific aircraft series—and has not expanded beyond this single purpose."},"complexity_factors":["Single, specific aircraft type listed in applicability with no ambiguity","Five explicit unit conversions listed in clear subparagraphs (a)-(e)","Single unconditional compliance deadline","One simple conditional provision ('Where' clause) requiring dual unit display for non-metric instrumentation","No defined terms section, no cross-references to other legislation, and no nested exceptions"],"plain_english_summary":"This Airworthiness Directive requires operators of Hawker Siddeley HS‑125/BAe 125 business jets to amend flight manuals to use Australia’s metric units (kg, metres, mm for balance, litres, kPa). If cockpit instruments remain in imperial units, the manual must show both systems for safe cross‑reference.  \n\nThe change prevents dangerous unit‑mixing during loading and operation; compliance was required by 1 January 1984."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-125-57-flight-manual-change-to-metric-units","history":"/api/acts/ad-hs-125-57-flight-manual-change-to-metric-units/history","analysis":"/api/acts/ad-hs-125-57-flight-manual-change-to-metric-units/analysis","conflicts":"/api/acts/ad-hs-125-57-flight-manual-change-to-metric-units/conflicts","importantCases":"/api/acts/ad-hs-125-57-flight-manual-change-to-metric-units/important-cases","documents":"/api/acts/ad-hs-125-57-flight-manual-change-to-metric-units/documents"}}