{"id":"F2006B09800","name":"AD/F28/66 Amdt 4 - Corrosion Prevention and Control Program","slug":"ad-f28-66-amdt-4-corrosion-prevention-and-control-program","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54721,"registerId":"commonwealth-F2006B09800-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/66 Amdt 4 - Corrosion Prevention and Control Program","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 F28 Series Aeroplanes\n\nAD/F28/66\n\nAmdt 4\n\n  \nCorrosion Prevention and Control Program 12/95\n\nApplicability: Model F28; except MK 0100 series.\n\nRequirement: Action in accordance with the technical requirements of RLD AD 91-051/4(A).\n\nNotwithstanding CAR 51B, corrosion classified as level 1 need not be reported. Level 2 corrosion may be consolidated with a sixty day report of corrective action, and submitted to the Authority District (Airport) Office under cover of a single MDR.\n\nLevel 3 corrosion shall be reported by individual MDR.\n\nNote 1: Fokker Document No. SE-253 Rev.4 refers.\n\nCompliance: As specified in the requirement document. The compliance of the previous issue of this Directive is as stated in this issue. This Amendment is effective from\n\n9 November 1995.\n\nBackground: The Country of Origin Airworthiness Authority requires implementation of a corrosion prevention and control program to prevent the degradation of the structural capabilities of the affected aircraft.\n\nAmendment 1 was raised in response to a revision of the Fokker corrosion control program document.\n\nAmendment 2 was raised to introduce a note which specifies the reporting requirements when corrosion is found as a result of the CPCP.\n\nAmendment 3 was issued in response to revision 3 of the Fokker corrosion control programme document.\n\nAmendment 4 is issued to reflect latest RLD AD and Fokker corrosion control programme document and to make minor textural amendments.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Amendment 4 does not broaden applicability or create new reporting categories; it updates the AD to reflect the latest RLD AD and Fokker corrosion-control document and makes minor textual changes. The Directive continues to require implementation of the corrosion prevention and control program for Model F28 (except MK 0100 series) and preserves the three-tier reporting approach (Applicability; Background; Requirement; Note 1)."},"complexity_factors":["Dependence on external technical documents (RLD AD 91-051/4(A) and Fokker Document SE-253 Rev.4) for substantive requirements, increasing cross-reference burden (Requirement; Note 1).","Tiered reporting regime based on corrosion classification (Level 1, Level 2, Level 3) with different timelines and consolidation rules creates operational decision points for maintainers (reporting clauses).","Interaction with existing regulation CAR 51B (expressly displaced for Level 1 reporting) requires attention to regulatory hierarchy (\"Notwithstanding CAR 51B\").","Applicability carve-out (excludes MK 0100 series) requires operators to verify affected fleets before applying the AD (Applicability).","Compliance text delegates procedural detail to the referenced requirement document, leaving implementation specifics outside the AD itself (Compliance; Requirement).","Amendment history and alignment with foreign airworthiness authority directives mean operators must track document revisions to remain compliant (Background; Amendments)."],"plain_english_summary":"Requires operators of Fokker F28 (except MK 0100 series) to implement a corrosion prevention and control program per RLD AD 91-051/4(A). It sets inspection/reporting rules: Level 1 need not be reported, Level 2 may be consolidated into a 60‑day corrective-action MDR, and Level 3 requires an individual MDR to the Authority District Office. Compliance is as specified in the referenced Fokker/RLD documents. Who pays/acts: aircraft operators and maintainers perform inspections and submit MDRs; the Civil Aviation Safety Authority receives and oversees reports."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"The legislation maintains its original scope. Amendment 4 remains focused on the corrosion prevention program for Fokker F28 aircraft, updating only to reflect the latest Dutch regulatory document and minor text corrections. The core purpose — mandating a corrosion control program — has not expanded beyond aircraft structural maintenance."},"complexity_factors":["Multiple amendment history (4 versions) with cross-references to previous changes","Reference to external technical documents (RLD AD 91-051/4(A) and Fokker Document SE-253 Rev.4) not reproduced in the text","Conditional reporting logic with three distinct corrosion levels and different reporting timeframes","Exception to standard reporting rule (CAR 51B) with specific carve-out for Level 1 corrosion","Cross-border regulatory dependency — relies on Dutch aviation authority documentation"],"plain_english_summary":"This CASA Airworthiness Directive mandates that owners and operators of Fokker F28 aeroplanes (except MK 0100) implement a Corrosion Prevention and Control Program, following the Netherlands’ RLD AD 91‑051/4(A). It requires inspection and rectification of corrosion and establishes reporting by severity: minor (no CASA report), moderate (grouped MDRs up to once every 60 days), and serious (immediate individual report). It affects airlines, maintenance organisations and owners in Australia and aims to prevent hidden corrosion from degrading aircraft structural integrity."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-66-amdt-4-corrosion-prevention-and-control-program","history":"/api/acts/ad-f28-66-amdt-4-corrosion-prevention-and-control-program/history","analysis":"/api/acts/ad-f28-66-amdt-4-corrosion-prevention-and-control-program/analysis","conflicts":"/api/acts/ad-f28-66-amdt-4-corrosion-prevention-and-control-program/conflicts","importantCases":"/api/acts/ad-f28-66-amdt-4-corrosion-prevention-and-control-program/important-cases","documents":"/api/acts/ad-f28-66-amdt-4-corrosion-prevention-and-control-program/documents"}}