{"id":"F2006B09811","name":"AD/F28/77 Amdt 1 - Rear Cargo Door and Aux. Structure Corrosion","slug":"ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54734,"registerId":"commonwealth-F2006B09811-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/77 Amdt 1 - Rear Cargo Door and Aux. Structure Corrosion","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)  \n![](image.002.png)  \nFokker F28 Series Aeroplanes\n\nAIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.png)  \nFor the reasons set out in the background section, the CASA delegate whose signature appears below revokes Airworthiness Directive (AD) AD/F28/77 and issues the following AD under subregulation 39.1 (1) of CAR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\nAD/F28/77\n\nAmdt 1\n\n  \nRear Cargo Door and Aux. Structure Corrosion 6/2000\n\nApplicability: F28 Mks. 1000 to 4000 serial numbers 11021 to 11241, 11991 and 11992\\. Requirement: Action in accordance with Fokker SB F28/52-111 dated 12 March 1994.\n\nNote: Netherlands AD BLA nr 1995-126(A) refers.\n\nCompliance: Inspect and modify within two years of the effective date of the initial issue of this Directive; thereafter inspect at intervals not exceeding three years, or 6000 hours time in service, whichever occurs first.\n\nThis Amendment becomes effective on 15 June 2000.\n\nBackground: Severe corrosion has been found inside the rear cargo door. This has been the result of spilled toilet fluids being absorbed by insulation blankets and providing a continuous corrosive environment.\n\nAmendment 1 is issued to re-specify the Applicability per the correction dated 31 March 2000 to the Netherlands AD.\n\nThe original issue of this Airworthiness Directive became effective on 29 February 1996.\n\n![](image.003.png)  \n\nBernard Malcolm Hole\n\nDelegate of the Civil Aviation Safety Authority 5 May 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 17 May 2000.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment maintains the original scope. Amendment 1 was issued solely to correct the applicability section (which aircraft serial numbers are covered) per a correction from the Netherlands aviation authority. The safety action, compliance requirements, and underlying purpose remain unchanged from the original 1996 directive."},"complexity_factors":["Single, specific technical requirement referencing an external document (Fokker Service Bulletin)","Straightforward compliance timeline (initial + recurring intervals)","Narrow applicability limited to specific aircraft model and serial number range","No nested exceptions, conditional logic, or extensive defined terms","Amendment serves only to correct applicability list, not substantive requirements","Total length: approximately 300 words"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspection and modification of the rear cargo door area on specified Fokker F28 Mark 1000–4000 aircraft to stop severe corrosion from toilet fluid soaking insulation. Owners, operators and maintenance organisations must follow Fokker Service Bulletin F28/52‑111, with initial work within two years and repeat inspections every three years or 6,000 flight hours.\n\nThis Amendment 1 only corrects the listed serial numbers; it does not change the required safety actions."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 re-specifies the AD's Applicability to particular serial numbers, citing a correction to the Netherlands AD dated 31 March 2000 (Amendment 1; Background). The original AD first became effective 29 February 1996; this amendment (effective 15 June 2000) updates which aircraft are covered (Applicability) without changing the stated corrective action (Requirement: Fokker SB F28/52-111) or the Compliance intervals."},"complexity_factors":["Technical mandate references an external manufacturer Service Bulletin (Requirement: Fokker SB F28/52-111 dated 12 March 1994), requiring operators to follow non-statutory technical instructions.","Applicability limited to specific aircraft serial numbers (Applicability: F28 Mks. 1000 to 4000 serial numbers 11021 to 11241, 11991 and 11992), creating fleet-specific compliance obligations.","Prescribed compliance timing with both calendar and flight-hour limits (Compliance: initial within two years; recurring every three years or 6,000 hours), requiring recordkeeping and scheduling.","Amendment history and cross-reference to a foreign AD (Background: Netherlands AD BLA nr 1995-126(A); Amendment 1 re-specifies Applicability per correction dated 31 March 2000) introduces change-tracking requirements for operators and regulators.","Regulatory formality: AD issued under CAR subregulation 39.1(1) (preamble), giving CASA delegate enforceable discretion to require corrective action.","Safety cause tied to a maintenance/operational source (toilet fluid absorbed by insulation blankets — Background), creating an operational root-cause that may require changes to maintenance/cleaning practices."],"plain_english_summary":"**What this AD does:** Requires operators of specified Fokker F28 aeroplanes (serials 11021–11241, 11991 and 11992) to inspect and modify the rear cargo door area per Fokker Service Bulletin F28/52-111 to correct corrosion caused by toilet-fluid contamination (Background; Requirement). **Who it affects and why it matters:** Affects those aircraft operators, who must pay for inspections and repairs and follow CASA's timing: initial work within two years and repeat inspections every three years or 6,000 hours (Compliance)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion","history":"/api/acts/ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion/history","analysis":"/api/acts/ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion/analysis","conflicts":"/api/acts/ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion/conflicts","importantCases":"/api/acts/ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion/important-cases","documents":"/api/acts/ad-f28-77-amdt-1-rear-cargo-door-and-aux-structure-corrosion/documents"}}