{"id":"F2006B09745","name":"AD/F27/96 - Pitot Static System - Modification","slug":"ad-f27-96-pitot-static-system-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115948,"registerId":"commonwealth-F2006B09745-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/96 - Pitot Static System - Modification","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEAL TH OF AUSTRALIA CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n\n(Civil Aviation Regulations 1998), PART 39 -105\n\n \n\n![](image.001.png)  Fokker F27 Series Aeroplanes\n\n \n\nAD/F27/96 Pitot Static System - Modification 9/78\n\nApplicability: All model F27 aeroplanes with S/Nos. 10505 to 10547 and 10550. Document:  1. Fokker F27 SB No. 34-41; or\n\n2. BLA 78-40-34.\n\n \n\nCompliance: Within 800 hours time in service after 30 September 1978.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text prescribes a modification for a defined set of serial numbers and sets a single compliance deadline. The supplied document contains no information indicating the scope has been expanded or narrowed from an earlier instrument; it stands as a targeted directive limited to the listed aircraft (Applicability; Compliance; Document sections)."},"complexity_factors":["Narrow applicability limited to specific serial numbers (Applicability section)","Requirement refers to external technical documents that contain the detailed modification steps (Document section)","Compliance deadline expressed in hours time in service after a fixed calendar date, requiring record‑keeping and hour‑tracking (Compliance section)","Technical nature of the work (pitot‑static system) implies need for qualified maintenance personnel and parts though those details are delegated to the referenced documents (Document section)","No alternative compliance path or waiver language present in supplied text, increasing reliance on exact referenced documents (Document section)"],"plain_english_summary":"This directive requires owners/operators of Fokker F27 aeroplanes S/N 10505–10547 and 10550 to modify the pitot‑static system, performed per either Fokker F27 Service Bulletin No. 34‑41 or BLA 78‑40‑34. The Civil Aviation Safety Authority sets the requirement; operators bear costs and must complete the modification within 800 hours time‑in‑service after 30 September 1978."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on pitot-static system modifications for a limited subset of Fokker F27 aircraft. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined elements: applicability (specific serial numbers), compliance deadline, and reference documents","No cross-references to other legislation beyond the enabling regulation (CAR 1998, Part 39)","Single unconditional requirement with clear deadline","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) that mandates a safety modification to the **pitot-static system** on specific Fokker F27 aircraft.\n\n**What it does:**\n- Requires owners/operators of certain Fokker F27 aeroplanes (serial numbers 10505 to 10547 and 10550) to modify their aircraft's pitot-static system.\n- The pitot-static system is a critical flight instrument system that measures airspeed, altitude, and vertical speed — essential for safe flight operations.\n\n**Who it affects:**\n- Operators of Fokker F27 aircraft with the specified serial numbers.\n- The modification must be carried out according to either Fokker Service Bulletin No. 34-41 or BLA 78-40-34 (technical documents specifying exactly what work needs to be done).\n\n**Why it matters:**\n- Airworthiness Directives are legally binding safety orders. Non-compliance means the aircraft cannot legally fly.\n- This directive addresses a specific safety issue with the pitot-static system that could affect flight safety if left unaddressed.\n\n**Deadline:**\n- The modification must be completed within **800 hours of flight time** after 30 September 1978."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-96-pitot-static-system-modification","history":"/api/acts/ad-f27-96-pitot-static-system-modification/history","analysis":"/api/acts/ad-f27-96-pitot-static-system-modification/analysis","conflicts":"/api/acts/ad-f27-96-pitot-static-system-modification/conflicts","importantCases":"/api/acts/ad-f27-96-pitot-static-system-modification/important-cases","documents":"/api/acts/ad-f27-96-pitot-static-system-modification/documents"}}