{"id":"F2006B09692","name":"AD/F27/125 Amdt 3 - Corrosion Prevention and Control","slug":"ad-f27-125-amdt-3-corrosion-prevention-and-control","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115847,"registerId":"commonwealth-F2006B09692-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/125 Amdt 3 - Corrosion Prevention and Control","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 F27 Series Aeroplanes\n\nAD/F27/125\n\nAmdt 3\n\n  \nCorrosion Prevention and Control 12/95\n\nApplicability: Model F27; except Mk 050 series.\n\nRequirement: Action in accordance with the technical requirements of RLD AD 91-113/4(A).\n\nCorrosion 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: Fokker document SE-291 Revision 3 refers.\n\nCompliance: As specified in the Requirement Document.\n\nThe compliance of the previous issues of this Directive remains unchanged. This Amendment is effective from 9 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 issued to specify the reporting requirements when corrosion is found as a result of the CCP.\n\nAmendments 2 & 3 are were issued to reflect the latest revision of the CCP document.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This amendment remains tightly focused on its original purpose: ensuring Fokker F27 operators implement and maintain a corrosion prevention program. Amendments 1-3 have only updated reporting procedures and referenced document revisions without expanding the scope beyond corrosion control for this specific aircraft type."},"complexity_factors":["Very short document (under 300 words)","Only 3 defined concepts (Level 1, 2, and 3 corrosion) — though these are industry-standard terms rather than legislative definitions","Single cross-reference to external technical document (RLD AD 91-113/4(A)) and manufacturer document (Fokker SE-291 Rev 3)","Simple conditional structure: three tiers of reporting requirements based on corrosion severity","No nested exceptions or complex legislative machinery","Straightforward compliance mechanism (follow the external technical standard)"],"plain_english_summary":"CASA requires operators of Fokker F27 aircraft (except the Mk 050 series) in Australia to follow the manufacturer’s/Dutch RLD corrosion prevention and control program to prevent structural degradation. It sets reporting: minor corrosion needs no report, moderate may be batched every 60 days, and serious cases require immediate individual reports. Amendment 3 updates the AD to the latest Fokker corrosion document."},"flash_summary":{"complexity_score":5,"scope_assessment":{"changed":false,"description":"Amendment 3 updates the directive to reflect the latest CCP revision and clarifies reporting procedures, but explicitly leaves compliance of previous issues unchanged; it does not expand the directive's applicability beyond the previously covered fleet."},"complexity_factors":["Reliance on external technical documents (RLD AD 91-113/4(A) and Fokker SE-291 Rev 3) for substantive requirements","Tiered reporting thresholds (level 1/2/3) with different submission rules and timelines","Exception for Mk 050 series introduces applicability nuance","Compliance is tied to a named 'Requirement Document' rather than detailed steps within the Directive","Reporting channel specified (Authority District (Airport) Office) and use of MDR terminology requires procedural knowledge","Amendment history retained (previous issues unchanged) may require cross-referencing earlier versions for full context"],"plain_english_summary":"This Airworthiness Directive requires operators of Fokker F27 aeroplanes (except Mk 050 series) to implement the corrosion prevention and control program specified in RLD AD 91-113/4(A) and related Fokker guidance. It sets reporting rules: level 1 corrosion need not be reported, level 2 may be consolidated into a single Mandatory Defect Report within 60 days, and level 3 must be reported individually.\n\nOperators pay for inspections, repairs and MDR submissions to the Authority District (Airport) Office. The stated purpose is to prevent structural degradation; compliance hinges on following the external Requirement Document, creating inspection, repair and record-keeping obligations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-125-amdt-3-corrosion-prevention-and-control","history":"/api/acts/ad-f27-125-amdt-3-corrosion-prevention-and-control/history","analysis":"/api/acts/ad-f27-125-amdt-3-corrosion-prevention-and-control/analysis","conflicts":"/api/acts/ad-f27-125-amdt-3-corrosion-prevention-and-control/conflicts","importantCases":"/api/acts/ad-f27-125-amdt-3-corrosion-prevention-and-control/important-cases","documents":"/api/acts/ad-f27-125-amdt-3-corrosion-prevention-and-control/documents"}}