{"id":"F2006B10882","name":"AD/JETSTREAM/15 - Aileron Drive Quadrant Stud Securing Nut","slug":"ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56406,"registerId":"commonwealth-F2006B10882-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/15 - Aileron Drive Quadrant Stud Securing Nut","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)  British Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\n \n\nAD/JETSTREAM/15 Aileron Drive Quadrant Stud Securing Nut 8/86\n\nApplicability: All HP137 Mk 1, Jetstream Series 200 and Jetstream Series 3100. Requirement: Action in accordance with BAe Jetstream S.B. 27-JM5257.\n\nCompliance: Within 600 hours time in service after 31 August 1986 or prior to 28 February 1987 whichever occurs first.\n\n \n\nBackground:  An incident has occurred where the nut securing the special stud on the aileron drive quadrant has worked loose due to inadequate peening. This may result in aileron vibration and in an extreme case may restrict aileron travel.\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 addressing a specific mechanical defect in specific aircraft models. It has not expanded beyond its original purpose of mandating a particular airworthiness fix."},"complexity_factors":["Single, specific mechanical defect addressed","Only 3 aircraft models affected with clear applicability","Single compliance requirement referencing an external technical standard (Service Bulletin 27-JM5257)","Simple time-based compliance window (600 hours or fixed date, whichever first)","No defined terms section, no cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Background explanation provided in plain language","Total length is approximately 150 words of substantive content"],"plain_english_summary":"This is an **Airworthiness Directive** (AD) — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain British Aerospace Jetstream aircraft to inspect and fix a potentially dangerous mechanical defect in the aileron control system. The problem involves a nut that secures a stud on the aileron drive quadrant (a component that helps control the plane's roll). If this nut comes loose due to improper \"peening\" (a metalworking technique that deforms the end of a bolt or stud to prevent loosening), it can cause the ailerons to vibrate or even restrict their movement — a serious flight safety risk.\n\n**Who it affects:**\n- Owners and operators of:\n  - HP137 Mk 1 aircraft\n  - Jetstream Series 200 aircraft  \n  - Jetstream Series 3100 aircraft\n\n**What must be done:**\nOperators must follow the specific repair instructions in British Aerospace Service Bulletin 27-JM5257. This work must be completed either:\n- Within 600 hours of flight time after 31 August 1986, **or**\n- Before 28 February 1987\n\nWhichever comes first.\n\n**Why it matters:**\nThis directive addresses a known mechanical failure that could compromise the pilot's ability to control the aircraft's roll, potentially leading to loss of control. Compliance is mandatory — aircraft cannot legally fly without this fix being applied."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD, as drafted, targets the aileron drive quadrant stud securing nut on specified Jetstream models and mandates action per the BAe service bulletin. The text does not expand or narrow the set of affected aircraft or the technical remedy beyond those references (Applicability; Requirement). Therefore there is no indication within this document that the scope has changed from the original corrective intent described in the Background."},"complexity_factors":["Narrow technical scope limited to a single component on specific aircraft types (Applicability; Background).","Direct cross-reference to manufacturer's service bulletin (BAe S.B. 27-JM5257) — requires access to and interpretation of external technical documents (Requirement).","Time-based compliance formula combining flight hours and a calendar cut-off (600 hours after 31 Aug 1986 or before 28 Feb 1987) — requires operators to track utilisation precisely (Compliance).","Requirement for certified maintenance personnel/facilities to perform the technical work described in the SB (implicit in Requirement).","No alternative compliance path, exemptions, or compensating measures are specified in the AD text (Requirement), limiting regulatory discretion but increasing operational inflexibility."],"plain_english_summary":"The Civil Aviation Safety Authority requires all HP137 Mk 1, Jetstream Series 200 and 3100 aircraft to be inspected and repaired per BAe Service Bulletin 27-JM5257 — completed within 600 flight hours after 31 Aug 1986 or by 28 Feb 1987 — after discovery that an inadequately peened nut on the aileron drive quadrant can cause vibration or restrict aileron travel. Operators must schedule, pay for and complete the SB work to reduce that safety risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut","history":"/api/acts/ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut/history","analysis":"/api/acts/ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut/analysis","conflicts":"/api/acts/ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut/conflicts","importantCases":"/api/acts/ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut/important-cases","documents":"/api/acts/ad-jetstream-15-aileron-drive-quadrant-stud-securing-nut/documents"}}