{"id":"F2006B10938","name":"AD/JETSTREAM/68 - Wings - Lower Surface at Landing Gear Bay","slug":"ad-jetstream-68-wings-lower-surface-at-landing-gear-bay","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56488,"registerId":"commonwealth-F2006B10938-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/68 - Wings - Lower Surface at Landing Gear Bay","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/68 Wings - Lower Surface at Landing Gear Bay\n\n\n10/94\n\n \n\nApplicability: All Jetstream 3200 Aircraft.\n\n \n\nRequirement: Inspect, using high frequency eddy current, the wing lower surface skin at the outboard end of the main landing gear bay for fatigue cracking in accordance with British Aerospace SB 57-JA 930640 Revision 1 Appendix A.\n\n \n\nCompliance: Initial inspection before 10000 landings or within 600 landings from 15 September 1994 whichever occurs last. Repeat inspections at 10000 landing intervals.\n\n \n\nNote: CAA (UK) AD 004-09-03 refers.\n\n \n\nBackground: Fatigue testing has shown a need to inspect the wing lower surface for cracking.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive explicitly applies to all Jetstream 3200 aircraft and prescribes inspection method and intervals; it does not broaden or narrow the stated applicability or requirements beyond that specification (Applicability; Requirement; Compliance)."},"complexity_factors":["Technical non‑destructive testing specified (high‑frequency eddy current) – requires specialist equipment and skills (Requirement).","Fixed, numeric compliance intervals tied to landing counts and a calendar reference increase monitoring/recordkeeping needs (Compliance).","Applies to the entire fleet model (all Jetstream 3200 aircraft), so affects every operator of that type (Applicability).","Inspection procedure is tied to a manufacturer's service bulletin, creating dependency on that document for method and acceptance criteria (Requirement: British Aerospace SB 57-JA 930640 Rev 1 App A).","Repeating inspections at 10,000‑landing intervals create an ongoing operational cost and scheduling burden (Compliance).","Text is prescriptive with few discretionary elements for regulators or operators, reducing legal ambiguity (Requirement; Compliance)."],"plain_english_summary":"This Airworthiness Directive requires all Jetstream 3200 operators to carry out high-frequency eddy-current inspections of the wing lower surface at the outboard end of the main landing gear bay to find fatigue cracking (Requirement; Applicability). The first inspection must occur before 10,000 landings or within 600 landings of 15 September 1994, then every 10,000 landings thereafter (Compliance). Operators pay for and schedule the inspections, which may cause aircraft downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standalone Airworthiness Directive with a narrow, specific purpose (inspecting one aircraft type for one specific defect). It has not expanded beyond its original safety intent."},"complexity_factors":["Single, discrete safety requirement with no subsections or nested conditions","Only one defined applicability criterion (Jetstream 3200 aircraft)","Simple temporal compliance formula (whichever occurs last of two dates/landings)","No cross-references to other legislation sections — only references to external technical documents (service bulletin and UK AD)","Total length under 200 words","No exceptions, exemptions, or conditional logic beyond the basic compliance timing"],"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:**\nIt requires owners and operators of **British Aerospace Jetstream 3200 aircraft** to inspect the underside of the wings near the main landing gear for **fatigue cracking** (tiny cracks that develop in metal from repeated stress, like bending a paperclip until it breaks).\n\n**Who must comply:**\nAnyone operating a Jetstream 3200 aircraft in Australia.\n\n**What must be done:**\n- **Initial inspection:** Must happen before the aircraft reaches 10,000 landings, OR within 600 landings after 15 September 1994 — whichever comes *later* (meaning you get the longer of the two timeframes).\n- **Repeat inspections:** Every 10,000 landings after that.\n- **Method:** A specialised technique called \"high frequency eddy current\" — a non-destructive test using electromagnetic fields to detect cracks without damaging the surface.\n\n**Why it matters:**\nFatigue testing revealed this area is prone to cracking. If left unchecked, cracks could compromise the wing structure — potentially catastrophic. This directive prevents accidents by catching problems early.\n\n**Reference note:** It points to a UK aviation safety bulletin (CAA AD 004-09-03) and a British Aerospace service bulletin for the exact inspection procedure."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-68-wings-lower-surface-at-landing-gear-bay","history":"/api/acts/ad-jetstream-68-wings-lower-surface-at-landing-gear-bay/history","analysis":"/api/acts/ad-jetstream-68-wings-lower-surface-at-landing-gear-bay/analysis","conflicts":"/api/acts/ad-jetstream-68-wings-lower-surface-at-landing-gear-bay/conflicts","importantCases":"/api/acts/ad-jetstream-68-wings-lower-surface-at-landing-gear-bay/important-cases","documents":"/api/acts/ad-jetstream-68-wings-lower-surface-at-landing-gear-bay/documents"}}