{"id":"F2006B09679","name":"AD/F27/110 - Forward Cabin Partition Bulkhead Door Hinges","slug":"ad-f27-110-forward-cabin-partition-bulkhead-door-hinges","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115821,"registerId":"commonwealth-F2006B09679-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/110 - Forward Cabin Partition Bulkhead Door Hinges","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\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Fokker F27 Series Aeroplanes\n\n \n\nAD/F27/110 Forward Cabin Partition Bulkhead Door Hinges 3/86\n\nApplicability: All F27 aircraft listed in the Requirement Document. Requirement: Action in accordance with Fokker S.B. F27/25-58.\n\nNote: R.L.D. Netherlands AD 86/04 refers.\n\n \n\nCompliance: Prior to 31 May 1986.\n\n \n\nBackground: After a wheels up landing incident the cabin door was found detached and partly blocking the doorway. This occurred due to the two part hinge assembly which allows the door to be lifted and removed. This Directive replaces the hinges with a type that is more secure.\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 directive maintains the original, stated safety objective—preventing door detachment by replacing the two-part hinge assembly—and applies to the F27 aircraft listed in the Requirement Document. It requires a manufacturer-prescribed retrofit and sets a deadline, consistent with the AD's stated remedial purpose (Background; Applicability; Requirement; Compliance)."},"complexity_factors":["Narrow technical scope limited to a specific component (forward cabin partition bulkhead door hinges)","Clear prescriptive action: follow a named manufacturer service bulletin (Fokker S.B. F27/25-58)","Fixed and short compliance deadline (Prior to 31 May 1986) increasing scheduling pressure","Cross-reference to an overseas AD (R.L.D. Netherlands AD 86/04) which may require coordination","Operational implications (parts procurement, certified maintenance, downtime) but no ongoing monitoring or record-keeping requirements specified"],"plain_english_summary":"### What this directive does\n\n- This Airworthiness Directive (AD) orders replacement of the forward cabin partition bulkhead door hinges on certain Fokker F27 aeroplanes. Mechanically, it requires modifying the existing two-part hinge assembly by installing a different hinge type that is described in the Fokker Service Bulletin (Fokker S.B. F27/25-58) (Requirement).\n\n### Who it affects\n\n- Aircraft operators and owners of the F27 aircraft listed in the Requirement Document (Applicability). The Civil Aviation Safety Authority publishes the AD and sets the compliance deadline (Compliance).\n\n### Why it matters (official rationale and an analytical reading)\n\n- Officially: the AD responds to an incident where, after a wheels-up landing, a cabin door became detached and partly blocked a doorway. The existing two-part hinge assembly allows the door to be lifted off; the AD replaces those hinges with a more secure type to prevent recurrence (Background).\n\n- Analytically: the directive targets a specific mechanical failure mode by mandating a hardware substitution. The stated safety goal is to reduce the risk of a door detaching during or after abnormal landings. To achieve that, the AD removes a removable-hinge design (the existing two-part hinge) and requires a more secure hinge specified by the manufacturer (Requirement). This changes operator behaviour by forcing a mandatory retrofit before the compliance date (Compliance).\n\n### Who pays and who decides\n\n- Operators/owners pay for procurement of parts, labour, and aircraft downtime to carry out the hinge replacement (inferred from the Required action referencing Fokker S.B. F27/25-58 and the Compliance deadline). The AD itself is issued by the civil aviation authority and compliance must be carried out in accordance with the Fokker service bulletin (Requirement).\n\n### Implementation and compliance effects\n\n- Timing: the AD sets a fixed compliance deadline (Prior to 31 May 1986) so affected aircraft must be modified before that date (Compliance).\n- Practical steps: compliance requires following the Fokker service bulletin procedures; this typically implies ordering parts, scheduling certified maintenance, and documenting the work (Requirement). The AD also cross-references a Netherlands AD (R.L.D. Netherlands AD 86/04) (Note).\n- Costs and opportunity costs: operators will incur direct costs for parts and maintenance and indirect costs from aircraft downtime before the deadline. If parts are limited or require manufacturer supply, there may be scheduling delays that affect operations (inference based on the mandatory retrofit requirement and reference to a manufacturer service bulletin).\n- Compliance burden: the directive is a single, hardware-focused corrective action rather than an ongoing regulatory program, so the burden is a one-off retrofit for affected aircraft (Requirement; Compliance).\n\n### Trade-offs, risks and discretion\n\n- The AD replaces a removable-hinge design with a more secure hinge type; the trade-off is a mandated retrofit cost versus a reduced risk of door detachment (Background; Requirement).\n- Implementation risk centers on parts availability, maintenance capacity, and meeting the compliance deadline; the AD does not itself set alternative compliance methods or exceptions (no such provision in the text). The civil aviation authority enforces the AD and operators must follow the specified service bulletin to comply (Requirement; Compliance).\n\n### Scope and targeting\n\n- The measure is narrowly targeted to F27 aeroplanes listed in the Requirement Document and to a specific component (forward cabin partition bulkhead door hinges) (Applicability)."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive addressing a specific mechanical defect identified after an incident. It has not expanded beyond its original purpose of mandating hinge replacement on Fokker F27 aircraft."},"complexity_factors":["Extremely short document (under 200 words)","Only one substantive requirement with a single compliance action","No defined terms section — all terms are ordinary technical aviation language","No cross-referencing to other legislation (only references a Fokker Service Bulletin and a Dutch aviation directive for context)","Single, absolute deadline with no conditional triggers or exceptions","No nested logic or alternative compliance paths"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of **Fokker F27 aircraft** to replace the hinges on a specific interior door (the forward cabin partition bulkhead door) with a more secure type.\n\n**Why this matters:** After a \"wheels up\" landing (where the landing gear wasn't deployed), the original door came loose and blocked the emergency exit — a serious safety hazard in an evacuation. The old hinges were two-piece designs that let the door lift off; the new ones stay attached.\n\n**Who must act:** Anyone operating Fokker F27 series aircraft covered by the referenced technical document (Fokker Service Bulletin F27/25-58).\n\n**What they must do:** Replace the door hinges before 31 May 1986.\n\n**Key point:** This isn't optional guidance — it's a legal requirement under the Civil Aviation Regulations. Non-compliance means the aircraft cannot legally fly."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-110-forward-cabin-partition-bulkhead-door-hinges","history":"/api/acts/ad-f27-110-forward-cabin-partition-bulkhead-door-hinges/history","analysis":"/api/acts/ad-f27-110-forward-cabin-partition-bulkhead-door-hinges/analysis","conflicts":"/api/acts/ad-f27-110-forward-cabin-partition-bulkhead-door-hinges/conflicts","importantCases":"/api/acts/ad-f27-110-forward-cabin-partition-bulkhead-door-hinges/important-cases","documents":"/api/acts/ad-f27-110-forward-cabin-partition-bulkhead-door-hinges/documents"}}