{"id":"F2006B09728","name":"AD/F27/31 - Ducting in Air Conditioning Compartment - Support Bracket - Introduction","slug":"ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115916,"registerId":"commonwealth-F2006B09728-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/31 - Ducting in Air Conditioning Compartment - Support Bracket - Introduction","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 F27 Series Aeroplanes\n\n \n\nAD/F27/31  Ducting in Air Conditioning Compartment - Support Bracket - Introduction\n\nDocument: Fokker SB L-15.\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\n \n\n \n\n \n\n \n\n \n\n \n\n\n3/61\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1442},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original scope: mandating the introduction of a specific support bracket for air conditioning ducting in Fokker F27 aircraft. There is no indication of scope creep or expansion beyond this specific safety modification."},"complexity_factors":["Single, discrete mechanical modification (one bracket installation)","Brief directive text that incorporates external technical instructions by reference","Narrow applicability limited to one specific aircraft type (Fokker F27 series)","No conditional compliance paths, exceptions, or alternative means of compliance stated in the text"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it requires:** Owners and operators of Fokker F27 series aircraft must install a support bracket for the ducting located in the air conditioning compartment. The directive mandates compliance with Fokker Service Bulletin L-15, which contains the specific technical instructions for this modification.\n\n**Who it affects:** Any person or organisation operating Fokker F27 series aeroplanes in Australia.\n\n**Why it matters:** The support bracket prevents the air conditioning ducting from becoming loose or failing in flight. Without this bracket, the ducting could shift or detach, potentially damaging critical aircraft systems or creating unsafe conditions. This is a proactive safety measure to address a potential airworthiness issue before it causes an incident."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction","history":"/api/acts/ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction/history","analysis":"/api/acts/ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction/analysis","conflicts":"/api/acts/ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction/conflicts","importantCases":"/api/acts/ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction/important-cases","documents":"/api/acts/ad-f27-31-ducting-in-air-conditioning-compartment-support-bracket-introduction/documents"}}