{"id":"F2006B04870","name":"AD/CASA/14 - Propeller Speed and Pitch Control","slug":"ad-casa-14-propeller-speed-and-pitch-control","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44677,"registerId":"commonwealth-F2006B04870-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/14 - Propeller Speed and Pitch Control","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)  Casa 212 Series Aeroplanes\n\n \n\nAD/CASA/14 Propeller Speed and Pitch Control 4/91\n\nDM\n\n \n\nApplicability: All Model C-212 Series aircraft.\n\n \n\nRequirement: Action in accordance with the Technical Requirements of FAA AD 91-03-10 Amdt 39-6883.\n\n \n\nCompliance: As specified in the Requirement Document but with a revised effectivity date of 18 April 1991 for Australian registered aircraft.\n\n \n\nBackground:  Inflight movement of the propeller speed and pitch settings into the ground operation mode have been reported and has caused one fatal accident. This modification will prevent use of propeller ground settings in flight.\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":4,"scope_assessment":{"changed":true,"description":"The directive adopts the FAA AD's technical requirements but changes the effectivity timing for Australian-registered aircraft by specifying a revised effectivity date of 18 April 1991. Aside from that timing modification, the instrument makes the FAA AD's requirements mandatory for all Model C-212 series aircraft registered in Australia. (See: Requirement; Compliance.)"},"complexity_factors":["Reliance on an external technical document (FAA AD 91-03-10) for the detailed mandatory steps creates cross-jurisdictional dependency and requires operators to consult another instrument.","Safety-critical technical nature: the directive mandates a mechanical/technical modification to propeller control systems, which requires specialist maintenance and verification.","Applicability is fleet-wide (all Model C-212 series), meaning multiple operators must coordinate implementation, creating scheduling and downtime complexity.","The instrument modifies the effectivity date for Australian-registered aircraft, adding a jurisdiction-specific timing element to an otherwise foreign AD.","The directive states the safety rationale (previous inflight movement and one fatal accident), so implementers must align technical changes to an asserted failure mode — interpreting and addressing that failure mode is a technical exercise.","Limited detail in the directive itself (it does not reproduce the FAA technical steps), so practical compliance depends on accurate interpretation and execution of the external Requirement document."],"plain_english_summary":"What this directive does\n\n- Requires that every CASA-registered Casa C-212 series aeroplane be modified or otherwise treated in the manner set out in the FAA Airworthiness Directive referenced (FAA AD 91-03-10). (See: Requirement; Applicability.)\n\nHow it works, mechanically\n\n- The CASA directive adopts the FAA's Technical Requirements (FAA AD 91-03-10) and makes them mandatory for Australian-registered C-212 aeroplanes. Operators must carry out the actions described in that FAA AD. (See: Requirement.)\n- The compliance start date for Australian-registered aircraft is explicitly set to 18 April 1991. (See: Compliance.)\n\nWhy the rule was issued (official rationale, stated in the text)\n\n- The background statement in the directive reports that inflight movement of propeller speed and pitch settings into the ground operation mode has been observed and that this defect has caused one fatal accident. The directive states that the required modification will prevent the use of propeller ground settings in flight. (See: Background.)\n\nWho this affects and who decides\n\n- Affected parties: owners and operators of all Model C-212 series aeroplanes that are registered in Australia. (See: Applicability.)\n- Decision-maker: the Civil Aviation Safety Authority (CASA) issues the directive by placing the FAA AD requirements into the Australian Schedule of Airworthiness Directives. The technical content itself is taken from the FAA document named in the Requirement. (See: Requirement.)\n\nWho pays and what behaviours change\n\n- The directive requires technical work on the affected aeroplanes; the owners/operators of those aeroplanes are the parties required to have the actions carried out. As a result, those operators will incur costs of parts, labour, and aircraft downtime necessary to implement the FAA AD's technical measures. (Inferred from: Applicability; Requirement.)\n- Behaviourally, operators must arrange for the specified modification or maintenance actions so that the propeller system cannot be placed into ground-operation mode while airborne. (See: Requirement; Background.)\n\nImplementation and compliance mechanics to note\n\n- The directive relies on an external technical document (FAA AD 91-03-10) for the detailed steps to be performed; the Australian instrument does not reproduce the technical steps but makes them mandatory for the nominated fleet. This creates a dependency on an external technical requirement document for precise compliance. (See: Requirement.)\n- The Compliance clause sets a specific effectivity date for Australian-registered aircraft, which modifies the timing of when the FAA AD's requirements become mandatory in Australia. (See: Compliance.)\n\nTrade-offs, incentives, and risks (source-grounded, descriptive)\n\n- The source claims a safety benefit: preventing in-flight selection of propeller ground settings. (See: Background.)\n- The source implies a concentrated obligation on owners/operators of the C-212 fleet to implement the technical change (a cost and operational disruption to those parties), while the stated safety benefit is realised by all who fly on or operate near those aircraft. (Inferred from: Applicability; Requirement; Background.)\n- Implementation depends on correct execution of the FAA AD technical requirements; the directive’s effectiveness therefore depends on competent compliance with those external technical instructions. (See: Requirement.)\n\nWhat the directive does not say (limits of the instrument)\n\n- The text does not specify costs, deadlines beyond the revised effectivity date, enforcement penalties, or who performs the work (maintenance provider). It also does not reproduce the technical steps from the FAA AD; those must be read in the referenced FAA document. (See: Requirement; Compliance.)"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue safety directive focused specifically on propeller control modifications for one aircraft type. It has not expanded beyond its original purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (the aircraft model series)","No nested conditional logic or exceptions","Single cross-reference to an external document (FAA AD 91-03-10) — the actual technical requirements are contained there, not here","Clear, unambiguous compliance deadline","No subsections, parts, or schedules within the instrument itself"],"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:**\nIt requires owners and operators of all **CASA 212 Series aircraft** (a type of twin-turboprop aeroplane) to carry out specific safety modifications to the propeller system.\n\n**The problem it fixes:**\nThere have been reports of the propeller speed and pitch controls accidentally moving into \"ground operation mode\" while the aircraft is flying. This is dangerous because ground settings are not designed for flight — in fact, this malfunction has already caused **one fatal accident**. The modification prevents the propeller from being set to ground-only settings while the aircraft is airborne.\n\n**Who must comply:**\nAnyone operating a **C-212 Series aircraft** registered in Australia.\n\n**What they must do:**\nFollow the technical instructions in **FAA AD 91-03-10** (a US Federal Aviation Administration safety directive). CASA has adopted this US standard but set a specific deadline for Australian aircraft: **18 April 1991**.\n\n**Why it matters:**\nThis directive prevents a known mechanical fault that has already killed someone. Non-compliance would mean operating an aircraft with a potentially fatal defect."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-14-propeller-speed-and-pitch-control","history":"/api/acts/ad-casa-14-propeller-speed-and-pitch-control/history","analysis":"/api/acts/ad-casa-14-propeller-speed-and-pitch-control/analysis","conflicts":"/api/acts/ad-casa-14-propeller-speed-and-pitch-control/conflicts","importantCases":"/api/acts/ad-casa-14-propeller-speed-and-pitch-control/important-cases","documents":"/api/acts/ad-casa-14-propeller-speed-and-pitch-control/documents"}}