{"id":"F2006B09920","name":"AD/F50/9 - Door External Handles","slug":"ad-f50-9-door-external-handles","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55136,"registerId":"commonwealth-F2006B09920-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F50/9 - Door External Handles","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/F50/9 Door External Handles 3/89\n\nApplicability: F27-050 S/Nos 20103 to 20108 and 20110. Requirement:  Action in accordance with Fokker SB F50-52-007.\n\nNote: RLD AD 88-91 refers.\n\n \n\nCompliance: Prior to 30 June 1989.\n\n \n\nBackground:  Excessive wear in the door external handle mechanism allows moisture ingress and may subsequently freeze the door operating mechanism.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound safety directive with a narrow, specific scope (particular door handles on particular aircraft). It has not expanded beyond its original purpose."},"complexity_factors":["Single, specific applicability (6 specific serial numbers)","Single requirement referencing one external document","Simple deadline-based compliance (single date)","No defined terms section","No conditional logic or nested exceptions","No cross-references to other legislation beyond a note about a related Dutch directive","Extremely short (under 150 words of substantive content)"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** Requires owners/operators of certain Fokker F50 aeroplanes to fix a problem with the door external handles before 30 June 1989.\n\n**Who it affects:** Specifically, Fokker F50 aircraft with serial numbers 20103 to 20108 and 20110.\n\n**The problem:** The door external handle mechanism was wearing out excessively. This wear let moisture get inside, which could freeze and jam the door operating mechanism — a serious safety risk if crew or passengers need to exit quickly in an emergency.\n\n**What must be done:** Aircraft operators must follow the instructions in **Fokker Service Bulletin F50-52-007** (a technical repair notice from the manufacturer) to fix or replace the worn components.\n\n**Why it matters:** Frozen door mechanisms could prevent emergency evacuation. This directive ensures the problem is fixed before a dangerous situation occurs."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The AD does not indicate any change to scope from an earlier intent within the text provided. It specifies the affected serial numbers (Applicability), prescribes action by reference to Fokker Service Bulletin F50-52-007 (Requirement), sets a compliance deadline (Compliance), and states the operational risk motivating the directive (Background). No amendment, expansion or narrowing of scope is described in the AD text itself."},"complexity_factors":["Narrow technical scope limited to a specific component (door external-handle mechanism) (Background).","Applicability confined to a small set of serial numbers, reducing breadth of affected parties (Applicability).","Mandates compliance by reference to an external technical document (Fokker SB F50-52-007), requiring access to and interpretation of that Service Bulletin (Requirement).","Fixed compliance deadline creates a single time-based constraint but no multi-stage obligations (Compliance).","Cross-reference to another AD (RLD AD 88-91) may require checking additional documents to understand full regulatory context (Note)."],"plain_english_summary":"This AD requires owners/operators of Fokker F50 aeroplanes serial numbers 20103–20108 and 20110 to carry out the maintenance specified in Fokker Service Bulletin F50‑52‑007 by 30 June 1989 to prevent moisture ingress and freezing of the external door‑handle mechanism. The compliance cost and scheduling burden fall on the affected operators; the AD delegates technical detail to the Service Bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f50-9-door-external-handles","history":"/api/acts/ad-f50-9-door-external-handles/history","analysis":"/api/acts/ad-f50-9-door-external-handles/analysis","conflicts":"/api/acts/ad-f50-9-door-external-handles/conflicts","importantCases":"/api/acts/ad-f50-9-door-external-handles/important-cases","documents":"/api/acts/ad-f50-9-door-external-handles/documents"}}