{"id":"F2006B05785","name":"AD/PA-31/8 - Wing Leading Edge Stall Strips - Installation","slug":"ad-pa-31-8-wing-leading-edge-stall-strips-installation","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":135672,"registerId":"commonwealth-F2006B05785-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PA-31/8 - Wing Leading Edge Stall Strips - Installation","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)  Piper PA-31 Series Aeroplanes\n\n \n\nAD/PA-31/8 Wing Leading Edge Stall Strips - Installation 7/69\n\nApplicability: All models with S/Nos. 31-2 to 31-445 except the following S/Nos. 31-3, -5, -346, -\n\n358, -367, -374, -379, -385, -407, -423, -424, -425, -429, -432, -435, -438, -440, -\n\n441, -442, and -443.\n\n \n\nDocument: Piper SB No. 294.\n\n \n\nCompliance: Within 50 hours time in service after 10 June 1969.\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":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive from 1969 addressing a specific safety modification. It has not expanded beyond its original purpose of mandating stall strip installation on affected Piper PA-31 aircraft."},"complexity_factors":["Very short document (under 200 words)","Only 4 operative sections: applicability, document reference, compliance deadline, and brief description","Single condition in applicability (serial number range with explicit exceptions)","No defined terms section","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Simple temporal compliance requirement (50 hours time in service after fixed date)","No nested exceptions or conditional logic beyond the serial number exclusions"],"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 requires:** Owners and operators of specific Piper PA-31 series aeroplanes must install \"stall strips\" on the wing leading edges. Stall strips are small aerodynamic devices that help control how air flows over the wing at slow speeds, preventing dangerous stalls (when the wing loses lift).\n\n**Who it affects:** \n- **Aircraft affected:** All Piper PA-31 models with serial numbers 31-2 through 31-445, **except** 19 specific serial numbers listed (31-3, -5, -346, -358, -367, -374, -379, -385, -407, -423 through -425, -429, -432, -435, -438, and -440 through -443).\n- **People affected:** Aircraft owners, operators, and maintenance engineers responsible for these planes.\n\n**When it had to be done:** Within 50 hours of flying time after 10 June 1969.\n\n**Why it matters:** This addresses a safety defect in the aircraft's stall characteristics. Without the fix, the aircraft might stall unexpectedly — a dangerous condition where the plane loses lift and could become uncontrollable at low speeds (such as during landing or takeoff).\n\n**Technical reference:** The work must follow Piper Service Bulletin No. 294 (the manufacturer's official repair instructions)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD sets a targeted, time-limited requirement for installation of stall strips on specified serial-numbered Piper PA-31 aircraft and identifies exceptions. The text contains no statement that it expands or reduces any previously stated scope; it simply prescribes the installation, points to Piper SB No. 294 for technical detail, and sets the compliance timeframe."},"complexity_factors":["Targeted applicability by serial-number range with an explicit exclusion list (requires careful record-checking).","Dependence on an external technical document (Piper SB No. 294) for the detailed installation procedure.","A short, fixed compliance window (50 hours TIS after a specified date) concentrates scheduling and operational impact.","Mandatory nature of the directive leaves little discretionary relief within the text; compliance method delegated to the SB.","The AD is brief and does not address parts availability, cost allocation rules, or enforcement mechanisms—practical details must be resolved outside the text."],"plain_english_summary":"This directive requires installation of wing leading edge stall strips on specified Piper PA‑31 aeroplanes (serials 31‑2 to 31‑445, with listed exclusions) following Piper Service Bulletin No. 294, to be completed within 50 hours TIS after 10 June 1969. It affects the registered owners/operators and maintenance organisations, who must schedule, pay for and certify the modification per the SB."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pa-31-8-wing-leading-edge-stall-strips-installation","history":"/api/acts/ad-pa-31-8-wing-leading-edge-stall-strips-installation/history","analysis":"/api/acts/ad-pa-31-8-wing-leading-edge-stall-strips-installation/analysis","conflicts":"/api/acts/ad-pa-31-8-wing-leading-edge-stall-strips-installation/conflicts","importantCases":"/api/acts/ad-pa-31-8-wing-leading-edge-stall-strips-installation/important-cases","documents":"/api/acts/ad-pa-31-8-wing-leading-edge-stall-strips-installation/documents"}}