{"id":"F2006B09036","name":"AD/DHC-2/19 Amdt 1 - Aileron Control Cables - Inspection","slug":"ad-dhc-2-19-amdt-1-aileron-control-cables-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52735,"registerId":"commonwealth-F2006B09036-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-2/19 Amdt 1 - Aileron Control Cables - Inspection","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)  DHC-2 (Beaver) Series Aeroplanes\n\n \n\nAD/DHC-2/19\n\nAmdt 1\n\n\nAileron Control Cables - Inspection 10/80\n\n \n\nApplicability: All models DHC-2 Mk. II and Mk. III.\n\n \n\nDocument: De Havilland Aircraft of Canada SB No. 2/27, Rev. A. Compliance:  Within 100 hours time in service after 30 November 1980.\n\nBackground: Investigations by the manufacturer have revealed that incorrect rigging tensions are being applied to the non- flexible steel cables in some cases.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on aileron cable inspections for one aircraft type. It has not expanded beyond its original narrow technical purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 2 defined applicability criteria (model variants)","Single compliance action required (inspection per referenced service bulletin)","No nested exceptions or conditional logic","No internal cross-references to other legislation sections","Simple temporal trigger (100 hours time in service after fixed date)","References only one external technical document (Service Bulletin 2/27 Rev A)"],"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 specific De Havilland DHC-2 \"Beaver\" aircraft (Mk. II and Mk. III models) to inspect their **aileron control cables** — the steel cables that connect the pilot's control stick to the wing flaps (ailerons) that make the plane turn left or right.\n\n**Why it matters:** The manufacturer discovered that some aircraft had **incorrect rigging tensions** on these cables. If the cables are too loose or too tight, the pilot might lose proper control of the aircraft during flight — a serious safety risk.\n\n**Who must comply:** Anyone operating the affected aircraft models.\n\n**What they must do:** Follow the inspection instructions in **De Havilland Service Bulletin No. 2/27, Revision A** within **100 hours of flight time** after 30 November 1980.\n\n**Key point:** This is **Amendment 1** to an existing directive, suggesting the original requirements were updated or clarified."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument applies to all DHC-2 Mk. II and Mk. III aeroplanes and requires inspection per the referenced service bulletin within the stated 100-hour window. The text contains no indication that the set of affected aircraft or the required action was expanded or narrowed relative to the instrument's stated purpose; therefore the scope has not changed from the presented intent. (Applicability; Document; Compliance; Background)"},"complexity_factors":["Narrow applicability: only DHC-2 Mk. II and Mk. III aircraft (Applicability)","Single, time-limited compliance action: one inspection within 100 hours after 30 Nov 1980 (Compliance)","Dependence on an external technical document (De Havilland SB No. 2/27 Rev A) for procedural detail (Document)","Technical nature of the task requires qualified maintenance personnel (Document)","Operational interruption and parts/labour cost uncertainty add administrative and economic complexity for operators (Compliance)"],"plain_english_summary":"What this instrument does (mechanical change)\n\n- Requires an inspection and any corrective action on the aileron control cables of De Havilland DHC-2 (Beaver) Mk. II and Mk. III aeroplanes. The work is to be carried out in accordance with De Havilland Aircraft of Canada Service Bulletin No. 2/27, Revision A. (Document; Applicability)\n- Sets a compliance deadline: the inspection must be done within 100 hours time in service after 30 November 1980. (Compliance)\n\nWho it affects\n\n- Aircraft owners and operators of DHC-2 Mk. II and Mk. III aeroplanes. (Applicability)\n- Maintenance organisations and mechanics who must perform the inspection and any adjustments or replacements in accordance with the referenced service bulletin. (Document)\n\nWhy it matters (official rationale and practical implications)\n\n- The stated reason is that the manufacturer’s investigations found that incorrect rigging tensions were being applied to the non-flexible steel aileron control cables in some cases. The directive implements inspection and corrective procedures recommended by the manufacturer to address that issue. (Background; Document)\n\nPractical effects, costs and incentives\n\n- Who pays: owners/operators pay for the inspection, labour, parts and any replacement or adjustment work required by the service bulletin. (Document; Compliance)\n- Business and operational impact: aircraft will be out of service while inspected and repaired, generating downtime and associated opportunity costs for operators. (Compliance)\n- Technical burden: the work calls for maintenance personnel to follow the manufacturer’s procedures; this requires appropriate technical skill and access to the service bulletin. (Document)\n- Compliance enforcement and discretion: the directive prescribes a compliance window and references the service bulletin for procedures. The supervising regulator or maintenance authority enforces compliance; the service bulletin determines technical steps, giving the manufacturer procedural control over how the directive is implemented. (Compliance; Document)\n\nTrade-offs and implementation risks\n\n- Trade-off: the measure substitutes operators’ short-term inspection and downtime costs for the safety objective of correcting incorrect cable rigging tensions. (Background)\n- Implementation risk: effectiveness depends on accurate adherence to the service bulletin and timely completion within the stated 100-hour window. If inspections are delayed or performed incorrectly, the risk the AD seeks to address may persist. (Document; Compliance)\n\nConcentrated benefits and diffuse costs\n\n- The immediate safety benefit accrues to operators and pilots of the specified aircraft (concentrated). The costs of inspections and repairs are borne by the same set of operators and maintenance providers (concentrated), while any broader administrative or oversight costs fall on the regulator (diffuse). (Applicability; Compliance)\n\nSummary statement\n\n- This AD mandates a manufacturer-prescribed inspection and corrective action for aileron control cables on all DHC-2 Mk. II and Mk. III aircraft within a defined 100-hour compliance window, responding to findings of incorrect rigging tensions. The practical consequences are inspection/repair costs, aircraft downtime, and reliance on the service bulletin for technical implementation. (Applicability; Document; Compliance; Background)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-2-19-amdt-1-aileron-control-cables-inspection","history":"/api/acts/ad-dhc-2-19-amdt-1-aileron-control-cables-inspection/history","analysis":"/api/acts/ad-dhc-2-19-amdt-1-aileron-control-cables-inspection/analysis","conflicts":"/api/acts/ad-dhc-2-19-amdt-1-aileron-control-cables-inspection/conflicts","importantCases":"/api/acts/ad-dhc-2-19-amdt-1-aileron-control-cables-inspection/important-cases","documents":"/api/acts/ad-dhc-2-19-amdt-1-aileron-control-cables-inspection/documents"}}