{"id":"F2006B10286","name":"AD/GENERAL/55 Amdt 2 - Directional Gyros - Inspection","slug":"ad-general-55-amdt-2-directional-gyros-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55976,"registerId":"commonwealth-F2006B10286-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/GENERAL/55 Amdt 2 - Directional Gyros - Inspection","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)  \nAircraft \\- General\n\nAD/GENERAL/55\n\nAmdt 2\n\n  \nDirectional Gyros \\- Inspection NK\n\nApplicability: All IFR aircraft fitted with directional gyros that do not have latitude correctors available to the flight crew.\n\nRequirement: 1. For Directional Gyros with precalibrated latitude correctors, ensure appropriate latitude is selected.\n\n2. For Directional Gyros without precalibrated latitude correctors, check for drift due to the earth rotation unless information is available that shows that the gyro is suitable for the latitude in which the aircraft is intended to operate. -\n\nNote 1: Directional Gyros adjusted for zero earth rate at the equator are generally acceptable for operations in Australia.\n\nNote 2: Where a Directional Gyro forms part of a system (such as a magnetic compass system), information which shows that the system characteristics in each mode of operation are suit-able for the latitude in which the aircraft is intended to operate, is sufficient to show compliance with paragraph 2.\n\nCompliance: Before issue of Australian Certificate of Airworthiness, or at next major inspection after 1 January 1980 for those aircraft already certificated.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2172},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument remains tightly focused on its original purpose: ensuring directional gyro accuracy for IFR aircraft across different latitudes. As Amendment 2, it retains the targeted scope of inspection requirements without expanding into unrelated operational areas."},"complexity_factors":["Technical aviation terminology requiring domain knowledge (IFR, directional gyros, latitude correctors, earth rate drift)","Conditional logic with exceptions ('unless information is available that shows...')","Reference to external certification documents (Australian Certificate of Airworthiness)"],"plain_english_summary":"This mandatory airworthiness directive requires operators of IFR aircraft with directional gyros lacking crew-accessible latitude correction to verify those instruments are set or proven suitable for the aircraft’s operating latitudes. Where gyros have preset latitude correctors, confirm the correct region is selected; otherwise check for Earth-rotation–induced drift or hold manufacturer evidence the gyro is accurate.\n\nIt matters because uncorrected drift can produce heading errors; compliance is required before an Australian Certificate of Airworthiness or at the next major inspection."}},"importantCases":[],"_links":{"self":"/api/acts/ad-general-55-amdt-2-directional-gyros-inspection","history":"/api/acts/ad-general-55-amdt-2-directional-gyros-inspection/history","analysis":"/api/acts/ad-general-55-amdt-2-directional-gyros-inspection/analysis","conflicts":"/api/acts/ad-general-55-amdt-2-directional-gyros-inspection/conflicts","importantCases":"/api/acts/ad-general-55-amdt-2-directional-gyros-inspection/important-cases","documents":"/api/acts/ad-general-55-amdt-2-directional-gyros-inspection/documents"}}