{"id":"F2006B10842","name":"AD/INST/39 - Altimeters Manufactured By CATIC","slug":"ad-inst-39-altimeters-manufactured-by-catic","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56329,"registerId":"commonwealth-F2006B10842-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/INST/39 - Altimeters Manufactured By CATIC","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nInstruments and Automatic Pilots\n\nAD/INST/39 Altimeters Manufactured By CATIC 5/96\n\nApplicability: All Altimeters manufactured by China National Aero Technology Import and Export Corporation (CATIC).\n\nNote 1: These altimeters generally have no manufacturer identification or markings on the instrument case or the instrument face.\n\nNote 2: These altimeters are known to be installed on but not limited to the Skyfox Aviation (Hedaro) CA21, CA22A, CA22A/25, CA25 and CA25N aircraft series.\n\nRequirement: Calibrate the altimeter in accordance with CAO 108.56.\n\nMajor Defect Reports are to be raised on any failed instrument in accordance with CAR 51B.\n\nCompliance: With effect from 25 April 1996:\n\n    Altimeters not installed in aircraft \\- prior to initial installation and thereafter at intervals not to exceed 12 calendar months after installation.\n\n    2. installed in aircraft and not having complied with AD/INST/8 in the previous 12 calendar months \\- prior to 1 August 1996 and thereafter at intervals not to exceed 12 calendar months.\n\n    3. Altimeters installed in aircraft and having complied with AD/INST/8 in the previous 12 calendar months \\- within 12 months of complying with AD/INST/8 and thereafter at intervals not to exceed 12 calendar months.\n\nBackground: Reports have been received of altimeters, with no identifying markings, giving erroneous altitude indications.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2094},"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This directive maintains a narrow, targeted scope focused on the specific safety defect of erroneous altitude indications from unmarked CATIC altimeters. The requirements remain confined to mandatory calibration and defect reporting for these specific instruments without expanding into broader regulatory territory."},"complexity_factors":["Three-tiered compliance schedule depending on installation status and prior calibration history under AD/INST/8","Cross-reference to technical standard CAO 108.56 for calibration procedures","Cross-reference to predecessor directive AD/INST/8 for determining compliance deadlines","Reference to CAR 51B for Major Defect Report obligations","Recurring 12-month calendar obligations with staggered start dates"],"plain_english_summary":"This directive requires mandatory calibration of unmarked CATIC aircraft altimeters (notably fitted to Skyfox CA21/CA22A/CA25 series) because they can give false altitude readings. It applies to owners and operators of aircraft with these altimeters.\n\nYou must have affected altimeters calibrated to CAO 108.56 and file a Major Defect Report under CAR 51B if they fail. Deadlines depend on installation and last check; compliance is critical because false readings pose serious flight-safety risks."}},"importantCases":[],"_links":{"self":"/api/acts/ad-inst-39-altimeters-manufactured-by-catic","history":"/api/acts/ad-inst-39-altimeters-manufactured-by-catic/history","analysis":"/api/acts/ad-inst-39-altimeters-manufactured-by-catic/analysis","conflicts":"/api/acts/ad-inst-39-altimeters-manufactured-by-catic/conflicts","importantCases":"/api/acts/ad-inst-39-altimeters-manufactured-by-catic/important-cases","documents":"/api/acts/ad-inst-39-altimeters-manufactured-by-catic/documents"}}