{"id":"F2006B06170","name":"AD/PFP/12 - Sensenich Propellers - Blade Straightening Limits","slug":"ad-pfp-12-sensenich-propellers-blade-straightening-limits","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47008,"registerId":"commonwealth-F2006B06170-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PFP/12 - Sensenich Propellers - Blade Straightening Limits","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 - 107 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Propellers - Fixed Pitch\n\n \n\nAD/PFP/12 Sensenich Propellers - Blade Straightening Limits NK\n\nApplicability: All models of Sensenich fixed pitch metal propellers.\n\n \n\nRequirement: Irrespective of data on \"The Maximum Allowable Bend for Cold Straightening\" published by the manufacturer, propeller blades shall not be cold straightened at any position closer to the hub than 20\" from the blade tip.\n\n \n\nCompliance: Forthwith.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, standalone safety directive. It has not expanded beyond its original purpose of imposing a specific repair limitation on Sensenich propellers."},"complexity_factors":["Single, unambiguous requirement with no defined terms","No cross-references to other legislation or sections","No conditional logic, exceptions, or nested provisions","Extremely short document (approximately 100 words of substantive content)","Clear applicability statement covering all models of a specific product"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety rule issued by the Civil Aviation Safety Authority (CASA) that applies to specific aircraft equipment.\n\n**What it does:** It sets a strict limit on how Sensenich fixed-pitch metal propellers can be repaired. Specifically, it bans \"cold straightening\" (bending a bent propeller blade back into shape without heating it) on any part of the blade that is closer than 20 inches to the hub.\n\n**Who it affects:** Anyone who owns, operates, or maintains aircraft fitted with any model of Sensenich fixed-pitch metal propellers — including mechanics, maintenance organisations, and pilots.\n\n**Why it matters:** Even if the manufacturer published different guidance about how much bend is acceptable for cold straightening, this rule overrides it. The concern is that straightening blades too close to the hub (where stresses are highest) could weaken the metal and cause the propeller to fail in flight — with potentially catastrophic consequences.\n\n**When you must comply:** Immediately (\"forthwith\"). There is no grace period."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"The directive narrows and overrides the repair tolerance that might otherwise be read from manufacturer guidance by prohibiting cold straightening at any point closer to the hub than 20\" from the blade tip, regardless of manufacturer‑published \"Maximum Allowable Bend for Cold Straightening\" (Requirement). This replaces any conflicting manufacturer allowance for cold straightening within that zone and applies immediately to all Sensenich fixed‑pitch metal propellers (Applicability, Compliance)."},"complexity_factors":["Narrow technical scope: applies only to Sensenich fixed‑pitch metal propellers (Applicability).","Clear numeric limit: single, specific prohibition (20\" from blade tip) reduces legal ambiguity (Requirement).","Immediate compliance: ‘Forthwith’ creates implementation urgency but does not add legal complexity (Compliance).","Override of manufacturer data: the phrase “Irrespective of” creates a legal precedence question but is straightforward in effect (Requirement).","Lack of procedural detail: absence of measurement, recordkeeping or transitional rules introduces modest practical uncertainty for implementers (Requirement, Compliance)."],"plain_english_summary":"The Civil Aviation Safety Authority has issued an immediate airworthiness directive banning cold‑straightening of all Sensenich fixed‑pitch metal propeller blades at any point closer than 20 inches from the blade tip. \n\nIt applies to aircraft owners/operators and maintenance providers, removing that in‑field repair option forthwith and likely increasing reliance on alternative repairs or replacements and associated costs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pfp-12-sensenich-propellers-blade-straightening-limits","history":"/api/acts/ad-pfp-12-sensenich-propellers-blade-straightening-limits/history","analysis":"/api/acts/ad-pfp-12-sensenich-propellers-blade-straightening-limits/analysis","conflicts":"/api/acts/ad-pfp-12-sensenich-propellers-blade-straightening-limits/conflicts","importantCases":"/api/acts/ad-pfp-12-sensenich-propellers-blade-straightening-limits/important-cases","documents":"/api/acts/ad-pfp-12-sensenich-propellers-blade-straightening-limits/documents"}}