{"id":"F2006B09296","name":"AD/DO-27/12 - Horizontal Tail Bearing Fitting Rivets","slug":"ad-do-27-12-horizontal-tail-bearing-fitting-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53376,"registerId":"commonwealth-F2006B09296-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DO-27/12 - Horizontal Tail Bearing Fitting Rivets","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)  Dornier DO-27 Series Aeroplanes\n\n \n\nAD/DO27/12 Horizontal Tail Bearing Fitting Rivets 13/96 DM\n\nApplicability: All Series all Serial Numbers.\n\n \n\nRequirement: Action in accordance with Daimler Benz Aerospace/Dornier SB1140-0000 dated 29 September 1995.\n\n \n\nNote: LBA AD 96-271 refers.\n\n \n\nCompliance: Within 30 days after 09 October 1996.\n\n \n\nBackground: Loosening of rivets is possible at the bearing flange, and “L” profile and profile of the frame.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow Airworthiness Directive targeting a specific technical defect in a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability (all series, all serial numbers)","Single requirement referencing an external technical document (the Service Bulletin)","No nested conditions, exceptions, or cross-references to other legislation","Simple compliance deadline (30 days from specified date)","No interpretation section or defined terms"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of **Dornier DO-27 series aeroplanes** (all models and serial numbers) to inspect and fix a specific problem with **rivets in the horizontal tail section** — the part at the back of the plane that helps control pitch (up and down movement).\n\n**The problem:** The rivets at the bearing flange and frame profiles can **loosen over time**. Loose rivets in the tail structure could compromise the aircraft's structural integrity and control.\n\n**What must be done:** Operators must follow the instructions in a **Daimler Benz Aerospace/Dornier Service Bulletin (SB 1140-0000)** dated 29 September 1995. This document details the inspection and repair procedures.\n\n**Who it affects:** Anyone who owns, operates, or maintains a Dornier DO-27 aircraft in Australia.\n\n**When it had to be done:** Within 30 days after 9 October 1996 (so this is a historical directive, long past its compliance date).\n\n**Why it matters:** Airworthiness Directives exist to prevent accidents. This one addresses a potential structural failure mode before it causes an incident. Ignoring an AD is illegal and grounds for grounding an aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive applies to \"All Series all Serial Numbers\" of Dornier DO-27 aeroplanes and prescribes action by reference to Daimler Benz Aerospace/Dornier SB1140-0000 within a 30-day deadline. The text contains no language that narrows or broadens coverage beyond that stated applicability, and no amendments or changes to scope are recorded in the provided document."},"complexity_factors":["All-series, all-serials applicability reduces ambiguity about which airframes are covered (Applicability).","Technical work is delegated to an external document (Daimler Benz Aerospace/Dornier SB1140-0000), so compliance requires obtaining and interpreting that bulletin rather than following steps inside the AD itself (Requirement).","Short, fixed compliance window (30 days after 9 October 1996) creates scheduling pressure for operators (Compliance).","The AD is short and contains only one substantive requirement, which lowers legal/textual complexity (Requirement).","Cross-reference to a foreign AD (LBA AD 96-271) adds a potential information source but not additional prescriptive steps in this AD (Note).","Operational complexity depends on the technical content of the referenced service bulletin (not reproduced here), so practical difficulty may vary by aircraft condition and available maintenance resources (Requirement)."],"plain_english_summary":"Owners/operators of all Dornier DO‑27 aircraft must, within 30 days of 9 Oct 1996, carry out the inspections/repairs specified in Daimler Benz Aerospace/Dornier Service Bulletin SB1140‑0000 addressing possible loosening of rivets at the horizontal tail bearing fitting. The operator arranges and pays for the work and downtime. The AD’s purpose is to mitigate rivet‑loosening risk and it cross‑references the related German LBA AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-27-12-horizontal-tail-bearing-fitting-rivets","history":"/api/acts/ad-do-27-12-horizontal-tail-bearing-fitting-rivets/history","analysis":"/api/acts/ad-do-27-12-horizontal-tail-bearing-fitting-rivets/analysis","conflicts":"/api/acts/ad-do-27-12-horizontal-tail-bearing-fitting-rivets/conflicts","importantCases":"/api/acts/ad-do-27-12-horizontal-tail-bearing-fitting-rivets/important-cases","documents":"/api/acts/ad-do-27-12-horizontal-tail-bearing-fitting-rivets/documents"}}