{"id":"F2006B09839","name":"AD/F50/14 Amdt 1 - Outer Wing End Rib Access Panel","slug":"ad-f50-14-amdt-1-outer-wing-end-rib-access-panel","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54879,"registerId":"commonwealth-F2006B09839-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F50/14 Amdt 1 - Outer Wing End Rib Access Panel","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 F50 (F27 Mk 50) Series Aeroplanes\n\n \n\nAD/F50/14\n\nAmdt 1\n\n\nOuter Wing End Rib Access Panel 6/89\n\n \n\nApplicability: S/No. 20103 to 20108 and 20110 to 20145 inclusive. Requirement:  Action in accordance with Fokker SB F50-57-004. Rev. 1.\n\nNote: RLD AD 89-017 Issue 2 refers.\n\n \n\nCompliance: Prior to 31 May 1989.\n\n \n\nBackground:  Deformation of the access panel increases the possibility of ice accretion and can cause heavy operation of the aileron during icing conditions. Amendment 1 references Revision 1 to the Requirement Document which lists additional aircraft affected, none of which are presently on the Australian Register.\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 technical amendment to an airworthiness directive. Amendment 1 simply expands the list of affected aircraft serial numbers to match the manufacturer's revised service bulletin. The scope remains tightly focused on the original safety issue (wing panel deformation and ice accretion) and does not extend to new systems, new operational requirements, or new classes of aircraft."},"complexity_factors":["Very short document — approximately 150 words of substantive content","Only 1 defined reference (the Fokker Service Bulletin)","No nested conditional logic or exceptions","Simple applicability test based on aircraft serial numbers only","Single compliance action with fixed deadline","No cross-references to other legislation beyond a note about a related Dutch airworthiness directive"],"plain_english_summary":"This is an **Airworthiness Directive** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Fokker F50 aeroplanes** (specific serial numbers 20103–20108 and 20110–20145) to inspect and fix a problem with the **outer wing end rib access panel** — a small door or cover on the wing.\n\n**The safety problem:**\nThe panel can become deformed (bent out of shape). This creates gaps where **ice can build up** during flight, which can make the **aileron** (the flap on the wing that controls rolling) become stiff or hard to operate in icy conditions — a serious flight safety risk.\n\n**What must be done:**\nOperators must follow the instructions in **Fokker Service Bulletin F50-57-004, Revision 1** — a technical repair guide from the aircraft manufacturer. This amended version (Amendment 1) adds more aircraft to the list of those affected, though CASA notes these additional planes aren't currently registered in Australia.\n\n**Deadline:**\nThe work had to be completed **before 31 May 1989**.\n\n**Who it affects:**\nAustralian operators of the specified Fokker F50 aircraft — mainly regional airlines and charter operators flying these Dutch-built turboprops."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":true,"description":"Amendment 1 references Revision 1 of the Fokker service bulletin, which lists additional aircraft affected. The Background explicitly notes those additional aircraft are not presently on the Australian Register. Mechanically, the formal scope in the referenced requirement document was expanded by the amendment, but that expansion does not, at present, increase the number of Australian-registered aircraft required to comply. (Background, Requirement)"},"complexity_factors":["Narrow technical scope limited to a single component (outer wing end rib access panel) and a single aircraft type (Fokker F50). (Background, Applicability)","Prescriptive compliance method: specific manufacturer service bulletin (F50-57-004 Rev. 1) sets the required actions, reducing procedural complexity but increasing dependency on that document. (Requirement)","Single fixed compliance deadline (31 May 1989) simplifies scheduling rules but creates temporal pressure. (Compliance)","Applicability tied to a defined list of serial numbers, which simplifies identification of affected aircraft but requires accurate registry/ownership data. (Applicability)","Amendment references additional serial numbers in the service bulletin revision, introducing a minor scope-tracking complexity (those additional aircraft are not on the Australian Register). (Background)"],"plain_english_summary":"The directive requires owners/operators of specified Fokker F50 (F27 Mk 50) aeroplanes (S/No. 20103–20108 and 20110–20145) to carry out the inspection and any repair/modification set out in Fokker Service Bulletin F50-57-004 Rev.1 by 31 May 1989. It responds to deformation of the outer wing end rib access panel that can increase ice buildup and cause heavy aileron operation in icing conditions; compliance costs and downtime fall to the affected operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f50-14-amdt-1-outer-wing-end-rib-access-panel","history":"/api/acts/ad-f50-14-amdt-1-outer-wing-end-rib-access-panel/history","analysis":"/api/acts/ad-f50-14-amdt-1-outer-wing-end-rib-access-panel/analysis","conflicts":"/api/acts/ad-f50-14-amdt-1-outer-wing-end-rib-access-panel/conflicts","importantCases":"/api/acts/ad-f50-14-amdt-1-outer-wing-end-rib-access-panel/important-cases","documents":"/api/acts/ad-f50-14-amdt-1-outer-wing-end-rib-access-panel/documents"}}