{"id":"F2006B09799","name":"AD/F28/64 - Cold-Bonded Lap Joint Rivets","slug":"ad-f28-64-cold-bonded-lap-joint-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54720,"registerId":"commonwealth-F2006B09799-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/64 - Cold-Bonded Lap Joint Rivets","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)  Fokker F28 Series Aeroplanes\n\n \n\nAD/F28/64 Cold-Bonded Lap Joint Rivets 5/91\n\nApplicability: Model F28 with serial numbers 11003 through 11013, and 11991 through 11992. Requirement:               Action in accordance with the technical requirements of RLD AD 90-126.\n\nNote: Fokker SB F28/53-109 refers.\n\n \n\nCompliance: As specified in the Requirement document but with a revised effectivity date of 16 May 1991 for Australian registered aircraft.\n\n \n\nBackground: Disbonding of cold-bonded longitudinal fuselage lap joints has been detected on several aircraft. Prolonged operation with large areas of disbonded lapjoints will result in fatigue cracking of rivet holes. To ensure sufficient fatigue life, identified critical rivets are replaced by protruding head type rivets.\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 standard Airworthiness Directive implementing a specific safety modification. The scope remains tightly focused on the original safety issue (cold-bonded lap joint rivet replacement) with no evidence of scope creep or expansion beyond the technical safety requirement."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges)","Single technical requirement referencing external document (RLD AD 90-126)","No nested conditional logic or exceptions","No cross-references to other legislation beyond the referenced service bulletin","Straightforward compliance date modification (single date change from original requirement)"],"plain_english_summary":"This CASA Airworthiness Directive mandates replacement of cold-bonded rivets with protruding-head rivets on specified Fokker F28 airframes (S/N 11003–11013, 11991–11992) registered in Australia. It addresses disbonding in lap joints that can lead to fatigue cracking and reduced fuselage structural integrity.\n\nAffected operators must comply by 16 May 1991 and follow the technical guidance in RLD AD 90-126 and Fokker Service Bulletin F28/53-109 to restore airworthiness."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive does not alter the technical requirements from the original RLD AD; it only revises the Australian effectivity date to 16 May 1991 (see Compliance). Operational scope and required actions remain those set out in RLD AD 90-126 (Requirement)."},"complexity_factors":["Narrow applicability by aircraft serial numbers (Applicability) reduces scope but increases need for precise records.","Reliance on an external technical document (RLD AD 90-126) and a service bulletin (Fokker SB F28/53-109) (Requirement) — compliance depends on cross-referencing other texts.","Safety-critical maintenance action (replace critical rivets) requires qualified maintenance personnel and parts, raising operational downtime and cost (Background).","Administrative amendment limited to effectivity date for Australian registrations (Compliance) — changes timing but not technical content.","Limited regulatory discretion in the AD itself; the substantive procedures are set out in the referenced documents rather than in the AD text."],"plain_english_summary":"This airworthiness directive requires operators of specific Fokker F28 aeroplanes (listed serial numbers) to carry out the maintenance actions in RLD AD 90-126 — primarily replacing identified cold-bonded lap-joint rivets with protruding‑head rivets — to prevent fatigue cracking caused by disbonded lap joints. The directive applies to Australian-registered aircraft from an effectivity date of 16 May 1991.\n\nIt affects aircraft operators and maintenance organisations, who bear inspection, replacement and downtime costs; compliance is by following the referenced technical document rather than reproducing procedures in the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-64-cold-bonded-lap-joint-rivets","history":"/api/acts/ad-f28-64-cold-bonded-lap-joint-rivets/history","analysis":"/api/acts/ad-f28-64-cold-bonded-lap-joint-rivets/analysis","conflicts":"/api/acts/ad-f28-64-cold-bonded-lap-joint-rivets/conflicts","importantCases":"/api/acts/ad-f28-64-cold-bonded-lap-joint-rivets/important-cases","documents":"/api/acts/ad-f28-64-cold-bonded-lap-joint-rivets/documents"}}