{"id":"F2006B09301","name":"AD/DO-27/6 - Fuel and Oil Hose Assemblies - Inspection","slug":"ad-do-27-6-fuel-and-oil-hose-assemblies-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53390,"registerId":"commonwealth-F2006B09301-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DO-27/6 - Fuel and Oil Hose Assemblies - 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)  \nDornier DO-27 Series Aeroplanes\n\nAD/DO-27/6 Fuel and Oil Hose Assemblies \\- Inspection NK\n\nApplicability: All Dornier DO-27 series aeroplanes equipped with German Standard LN9226 fuel and oil system hoses that:\n\n    (a) have Technochemie end fittings,\n\n    (b) were installed or supplied as spares by the Dornier factory between 1 December 1964 and 1 September 1965; and\n\n    (c) have not subsequently been returned to Dornier for checking.\n\nRequirement: Inspect affected fuel and oil system hose assemblies for internal damage and obstruction of the bore as specified in Dornier TB No. 27-29 Second Edition. German AD No. 65-85 also refers to this subject.\n\nNote: Dornier TB No. 28-26A provides information on the means of identification of Technochemie end fittings.\n\nCompliance: Installed hoses: Unless already accomplished subsequent to 1 September 1965, within the next 100 hours time in service after 2 November 1967.\n\nSpare hoses: Before installation and repeat once within the first 100 hours time in service.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"Scope is narrowly targeted to a specific subset of Dornier DO‑27 hose assemblies defined by hose type, end fittings and installation/supply dates. The AD’s requirements and deadlines align with that targeted applicability and do not expand beyond the described parts or procedures."},"complexity_factors":["Narrow, specific applicability tied to aircraft model, hose standard and installation/supply dates (Applicability).","Requires compliance with an external technical document (Dornier TB No. 27-29 Second Edition) rather than full procedural text in the AD (Requirement).","Different timing rules for installed versus spare hoses, with absolute and recurring deadlines (Compliance).","Identification guidance referenced separately (Dornier TB No. 28-26A) for Technochemie end fittings (Note).","Limited regulatory discretion: directive prescribes inspections and timing rather than subjective enforcement criteria."],"plain_english_summary":"This airworthiness directive requires owners/operators of Dornier DO‑27 aeroplanes fitted with German Standard LN9226 fuel/oil hoses with Technochemie end fittings (installed or supplied by Dornier between 1 Dec 1964 and 1 Sep 1965 and not returned to Dornier) to inspect those hose assemblies for internal damage and bore obstruction, following Dornier Technical Bulletin No. 27‑29 Second Edition. Inspections must meet the deadlines in the AD: installed hoses within 100 hours after 2 Nov 1967; spare hoses before installation and once within their first 100 hours."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It targets a specific safety issue (defective Technochemie hose fittings on Dornier DO-27 aircraft from a defined production period) and does not appear to have expanded beyond this original technical safety purpose."},"complexity_factors":["Single, specific applicability criteria (three conditions that must all be met)","One primary requirement referencing an external technical document (Dornier TB No. 27-29)","Simple compliance timeline (100 hours time in service)","No defined terms section","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward conditional logic (if hoses meet criteria A+B+C, then inspect)"],"plain_english_summary":"Airworthiness Directive requires owners/operators of Dornier DO‑27 aircraft to inspect factory‑installed fuel and oil hoses with Technochemie end fittings produced during the 1964–1965 manufacturing window. These hoses may have internal damage or blockages that could cause engine failure or fire; inspections must follow Dornier TB No. 27‑29 and are mandatory for in‑service and spare hoses before or shortly after installation. This targets a narrow manufacturing defect and is compulsory to prevent catastrophic failures."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-27-6-fuel-and-oil-hose-assemblies-inspection","history":"/api/acts/ad-do-27-6-fuel-and-oil-hose-assemblies-inspection/history","analysis":"/api/acts/ad-do-27-6-fuel-and-oil-hose-assemblies-inspection/analysis","conflicts":"/api/acts/ad-do-27-6-fuel-and-oil-hose-assemblies-inspection/conflicts","importantCases":"/api/acts/ad-do-27-6-fuel-and-oil-hose-assemblies-inspection/important-cases","documents":"/api/acts/ad-do-27-6-fuel-and-oil-hose-assemblies-inspection/documents"}}