{"id":"F2006B04313","name":"AD/BEECH 99/3 - Wing Attach Fittings, Bolts and Nuts","slug":"ad-beech-99-3-wing-attach-fittings-bolts-and-nuts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44128,"registerId":"commonwealth-F2006B04313-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 99/3 - Wing Attach Fittings, Bolts and Nuts","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBeechcraft 99 Series Aeroplanes\n\nAD/BEECH 99/3 Wing Attach Fittings, Bolts and Nuts 5/95\n\nApplicability: All model 99, 99A, A99A, B99 and C99 aircraft.\n\nRequirement: 1. For serial numbers U-1 to U-179, U-181 to U-184, U-186 to U-192 and U-194 to U-196 replace the steel outboard wing attach bolts and nuts with inconel bolts and nuts in accordance with Beechcraft Service Instruction (SI) 1235.\n\n    2. Inspect the inconel outboard wing attach bolts and nuts in accordance with Beechcraft Structural Inspection and Repair Manual 98-39006A4, Section 57-15- 00, pages 214 - 227.\n\n    3. Replace time expired inconel outboard wing attach bolts and nuts. Compliance: 1. Replace steel bolts and nuts before further flight after 27 September 1995.\n    2. Inspect inconel bolts and nuts at intervals not to exceed 5 years component time in service.\n\n    3. Replace inconel bolts and nuts at intervals not to exceed 15 years component time in service.\n\nBackground: This Directive requires replacement of critical, safety of flight, life limited items. Similar Directives are already in place for other Beech aircraft with similar wing structure.","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. It has not expanded beyond its original purpose of ensuring wing attachment integrity."},"complexity_factors":["Single, specific technical requirement with clear compliance dates","Only 3 defined compliance actions (replacement, inspection, re-replacement)","Limited applicability (specific aircraft models and serial number ranges)","No nested exceptions or conditional logic","Straightforward timeline requirements (5-year inspections, 15-year replacement)","References external technical documents (Service Instruction and Repair Manual) but does not incorporate them by complex cross-reference"],"plain_english_summary":"Owners/operators of specified Beechcraft 99-series aircraft must replace steel wing-attachment bolts with stronger inconel bolts and nuts, inspect those bolts every 5 years, and fully replace the inconel bolts every 15 years. It applies to serial numbers U‑1 through U‑196 (with gaps). The rule prevents catastrophic wing separation by addressing deficient steel bolts; steel bolts had to be replaced before any flight after 27 September 1995."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive’s scope is consistent with its stated purpose: replace life-limited wing attach hardware on specified Beech 99-series serial numbers and impose inspection/replacement intervals. The Background notes similar requirements for other Beech models, indicating alignment rather than a scope expansion."},"complexity_factors":["Targeted scope by model and specific serial-number ranges (requires careful fleet identification).","Cross-references to manufacturer documents (Beechcraft SI 1235 and Structural Inspection and Repair Manual) for technical procedures.","Mix of one-off mandatory replacement (deadline) and recurring maintenance intervals (5‑year inspections; 15‑year replacement), creating scheduling constraints.","Safety-critical, life-limited parts requiring certified parts sourcing (inconel bolts/nuts) and possible engineering/maintenance sign-off.","Operational impacts: grounding until compliance for affected aircraft and record-keeping obligations under the Compliance provision."],"plain_english_summary":"This airworthiness directive requires certain Beechcraft 99-series aeroplanes to have their steel outboard wing attach bolts and nuts replaced with inconel parts, and to undergo recurring inspections and a 15‑year replacement cycle for those inconel components. It applies to specified serial-numbered aircraft and targets life‑limited, safety‑critical wing fittings. Owners and operators must follow Beechcraft service instructions and the Structural Inspection and Repair Manual, bearing the cost and maintenance downtime for replacement, inspection and record-keeping."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-99-3-wing-attach-fittings-bolts-and-nuts","history":"/api/acts/ad-beech-99-3-wing-attach-fittings-bolts-and-nuts/history","analysis":"/api/acts/ad-beech-99-3-wing-attach-fittings-bolts-and-nuts/analysis","conflicts":"/api/acts/ad-beech-99-3-wing-attach-fittings-bolts-and-nuts/conflicts","importantCases":"/api/acts/ad-beech-99-3-wing-attach-fittings-bolts-and-nuts/important-cases","documents":"/api/acts/ad-beech-99-3-wing-attach-fittings-bolts-and-nuts/documents"}}