{"id":"F2006B09621","name":"AD/F100/20 - Cleats at Wing Rib STA.8200","slug":"ad-f100-20-cleats-at-wing-rib-sta-8200","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54390,"registerId":"commonwealth-F2006B09621-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F100/20 - Cleats at Wing Rib STA.8200","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)  \nFokker F100 (F28 Mk 100) Series Aeroplanes\n\nAD/F100/20 Cleats at Wing Rib STA.8200 4/99\n\nApplicability: F.28 Mk.0100 aircraft, serial numbers 11244 through 11256, 11258 through 11260,\n\n11263, 11268 through 11283, 11286, 11289, 11291, 11293, 11295, and 11297.\n\nRequirement: Inspect the cleats at the LH and RH wing rib STA.8200 in accordance with Fokker Service Bulletin (SB) F100-57-018 dated 23 September 1993.\n\nNote: RLD BLA 93-142(A) refers.\n\nCompliance: Before accumulating 16,000 flight cycles since new.\n\nThis Airworthiness Directive becomes effective on 22 April 1999.\n\nBackground: As a result of an inspection during manufacture of the wings for the F.28 Mk.0100, cracks were discovered in the cleats at the LH and RH wing rib STA.8200.\n\nInvestigation revealed that this was due to incorrect installation of certain Hi-lok bolts in the bottom wing skin. This AD requires an inspection and replacement of the affected cleats.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD maintains a narrowly targeted scope: it applies only to the listed F.28 Mk.0100 serial numbers and requires inspection and replacement of cleats at wing rib STA.8200 in accordance with the Fokker Service Bulletin, to be completed before 16,000 flight cycles (Applicability; Requirement; Compliance). There is no indication in the AD text that the scope was expanded beyond addressing the manufacturing-identified cleat cracks caused by incorrect Hi-lok bolt installation (Background)."},"complexity_factors":["Narrow applicability to a specific list of aircraft serial numbers (Applicability)","Technical inspection requirement referencing an external manufacturer Service Bulletin (Requirement)","Compliance tied to an airframe life metric (16,000 flight cycles) rather than a calendar date (Compliance)","Operational implementation issues such as grounding, parts availability and maintenance scheduling (Requirement; Compliance)","Relatively simple corrective action (inspection and replacement) with limited regulatory discretion (Requirement)"],"plain_english_summary":"This AD requires operators of certain Fokker F100 aeroplanes to carry out a physical inspection of the left- and right‑hand cleats at wing rib STA.8200, following Fokker Service Bulletin F100‑57‑018, and to replace any affected cleats before the aircraft reaches 16,000 flight cycles. CASA issued the directive after cracks were traced to incorrect Hi‑lok bolt installation during manufacture.\n\nThe work and any parts/grounding time are the operators’ responsibility, potentially causing maintenance downtime and concentrated demand for specified spares and services."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive (AD) — a targeted safety instrument with narrow, specific scope from inception. It addresses a discrete manufacturing defect in a limited fleet subset and has not expanded beyond its original purpose."},"complexity_factors":["Single, specific technical requirement with clear reference to external document (Fokker Service Bulletin)","Limited applicability to specific aircraft serial numbers (approximately 30 aircraft)","Simple compliance trigger: 16,000 flight cycles since new","No nested exceptions, conditional logic, or extensive cross-referencing","Short document with minimal defined terms (only standard aviation terminology like 'LH/RH' for left/right and 'STA' for station)","Straightforward background explaining the safety issue"],"plain_english_summary":"This is a **safety order for specific Fokker F100 aircraft**. It requires airlines and operators to inspect and potentially replace metal brackets (called \"cleats\") on the left and right wings of certain planes before they reach 16,000 flights.\n\n**What happened:** During manufacturing, cracks were found in these wing brackets. The cause was incorrectly installed bolts in the bottom wing skin.\n\n**Who must comply:** Only operators of Fokker F100 aircraft with specific serial numbers listed in the document (roughly 30 specific planes).\n\n**What they must do:** Follow Fokker's official service instructions (Service Bulletin F100-57-018) to inspect the brackets at a specific location on the wing (called \"STA.8200\" — a station marker indicating a position on the wing structure).\n\n**When:** The inspection must happen before the aircraft completes 16,000 flight cycles (one takeoff and landing equals one cycle).\n\n**Why it matters:** Cracked wing components could lead to structural failure, potentially causing catastrophic accidents. This directive prevents that by catching the problem early."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f100-20-cleats-at-wing-rib-sta-8200","history":"/api/acts/ad-f100-20-cleats-at-wing-rib-sta-8200/history","analysis":"/api/acts/ad-f100-20-cleats-at-wing-rib-sta-8200/analysis","conflicts":"/api/acts/ad-f100-20-cleats-at-wing-rib-sta-8200/conflicts","importantCases":"/api/acts/ad-f100-20-cleats-at-wing-rib-sta-8200/important-cases","documents":"/api/acts/ad-f100-20-cleats-at-wing-rib-sta-8200/documents"}}