{"id":"F2006B09295","name":"AD/DO-27/11 - Wing Flap Position Selector","slug":"ad-do-27-11-wing-flap-position-selector","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53374,"registerId":"commonwealth-F2006B09295-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DO-27/11 - Wing Flap Position Selector","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/DO-27/11 Wing Flap Position Selector 2/89\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with Dornier Service Bulletin 1116-0000.\n\n \n\nNote: LBA AD 88-109 refers.\n\n \n\nCompliance: Prior to 1 March 1989.\n\n \n\nNote: Flight Manual to be amended to G1 status restricting maximum flap deflection to 35 degrees prior to 1 March 1989 unless accomplished previously.\n\n \n\nBackground:  This modification is to improve the longitudinal controllability of the aircraft in the landing configuration.\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":2,"scope_assessment":{"changed":false,"description":"The AD's scope is a targeted safety intervention applying to all Dornier DO-27 models, requiring a specific modification per Dornier Service Bulletin 1116-0000 and an interim Flight Manual restriction to 35 degrees flap deflection until the modification is completed. The directive does not expand beyond that stated intent (improving longitudinal controllability) nor introduce additional obligations beyond the service bulletin, the Flight Manual amendment, and the fixed compliance date. (Applicability; Requirement; Note on Flight Manual; Compliance; Background)"},"complexity_factors":["Narrow regulatory action with a single mandated technical remedy (follow a specified service bulletin) limits legal complexity.","Clear, fixed compliance deadline reduces ambiguity about timing (Compliance: prior to 1 March 1989).","Applicability covers all models, expanding operational reach but not adding legal nuance (Applicability: All models).","The AD delegates technical detail to an external document (Dornier Service Bulletin 1116-0000), so legal text is simple but technical execution depends on the bulletin.","A short-term operational restriction (Flight Manual G1, 35 degrees) adds an administrative compliance step.","The AD does not set out alternative compliance paths or exemptions within its text, lowering statutory complexity but increasing reliance on regulator/manufacturer processes for any variation."],"plain_english_summary":"This CASA airworthiness directive requires all Dornier DO-27 operators to carry out the modification specified in Dornier Service Bulletin 1116-0000 by 1 March 1989; until then, the Flight Manual must be amended to limit flap deflection to 35°. It affects every owner/operator (who bears the cost) and is intended to improve longitudinal controllability in the landing configuration, with the SB providing the mandatory technical procedure."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on flap selector modification for one aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document — approximately 150 words of substantive content","Only 1 defined term implicitly used ('G1 status' — referring to flight manual revision level, explained in context)","Single, unambiguous compliance requirement with clear deadline","No nested exceptions or conditional logic — applies to 'All models' unconditionally","Cross-reference to external technical document (Dornier Service Bulletin) but no internal cross-referencing within the legislation itself","Background section provides clear rationale without legal caveats"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of **Dornier DO-27 series aeroplanes** (a type of light aircraft) to carry out a specific safety modification to the **wing flap position selector** — the control that sets how far the wing flaps extend during takeoff and landing.\n\n**Who it affects:**\nAnyone who owns, operates, or maintains any model of Dornier DO-27 aircraft in Australia.\n\n**What must be done:**\n- Follow the instructions in **Dornier Service Bulletin 1116-0000** (a technical notice from the aircraft manufacturer)\n- Update the aircraft's **Flight Manual** to \"G1 status\" — this means adding a restriction that wing flaps cannot be lowered more than **35 degrees**\n- Complete everything **before 1 March 1989**\n\n**Why it matters:**\nThe modification improves **longitudinal controllability** — basically, it helps the pilot keep the aircraft's nose up or down properly during landing. Without this fix, the aircraft could be harder to control when landing, creating a safety risk.\n\n**Key point:** This directive references a German aviation authority notice (LBA AD 88-109), showing Australia was adopting a safety measure already required in Germany."}},"importantCases":[],"_links":{"self":"/api/acts/ad-do-27-11-wing-flap-position-selector","history":"/api/acts/ad-do-27-11-wing-flap-position-selector/history","analysis":"/api/acts/ad-do-27-11-wing-flap-position-selector/analysis","conflicts":"/api/acts/ad-do-27-11-wing-flap-position-selector/conflicts","importantCases":"/api/acts/ad-do-27-11-wing-flap-position-selector/important-cases","documents":"/api/acts/ad-do-27-11-wing-flap-position-selector/documents"}}