{"id":"F2006B09767","name":"AD/F28/3 - Speedbrake Accumulators - Mounting Brackets - Inspection","slug":"ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54654,"registerId":"commonwealth-F2006B09767-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/3 - Speedbrake Accumulators - Mounting Brackets - Inspection","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 F28 Series Aeroplanes\n\n \n\nAD/F28/3 Speedbrake Accumulators - Mounting NK\n\nBrackets - Inspection Applicability: All model F28 Series not modified to SB F28/53-4. Document:               Fokker SB F28/53-3.\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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused specifically on speedbrake accumulator mounting brackets. It represents the original and continuing purpose of airworthiness directives: addressing specific unsafe conditions in particular aircraft types. No scope creep is evident."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Single, specific technical requirement (inspection of one component)","Clear applicability clause (all models except those modified per SB F28/53-4)","Only one cross-reference (to Fokker Service Bulletin F28/53-3)","No defined terms section","No conditional logic or nested exceptions","Standard AD format with minimal procedural detail"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** issued by Australia's Civil Aviation Safety Authority (CASA) for **Fokker F28 series aircraft**.\n\n**What it does:**\n- Requires inspection of the **mounting brackets** that hold the **speedbrake accumulators** (hydraulic components that help deploy the aircraft's speedbrakes/spoilers)\n- Applies to all F28 models **unless** they've been modified according to Service Bulletin F28/53-4\n- References Fokker Service Bulletin F28/53-3 as the technical document detailing the required inspection\n\n**Who it affects:**\n- Owners and operators of Fokker F28 aircraft in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety orders. If the mounting brackets for speedbrake accumulators fail, the aircraft may lose critical braking assistance during landing, potentially causing runway overruns or loss of control. This AD ensures potential cracks or failures in these brackets are detected before they cause accidents."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text is a single AD that prescribes inspection of speedbrake accumulator mounting brackets for specified F28 aircraft and references a manufacturer service bulletin for technical details. The instrument itself does not include any language indicating a change from an earlier scope or intent, so no scope change is apparent from the supplied text."},"complexity_factors":["Directive text is short and narrowly focused (inspection of a specific component). (AD/F28/3)","Applicability carve-out requires verification of whether SB F28/53-4 has been applied to each aircraft. (Applicability: All model F28 Series not modified to SB F28/53-4.)","The AD delegates technical detail to an external manufacturer document (Fokker SB F28/53-3), so compliance requires consulting and following that separate document. (Document: Fokker SB F28/53-3)","Legal authority is by reference to Civil Aviation Regulations 1998, Part 39, which frames enforcement but is not reproduced here. (Civil Aviation Regulations 1998, PART 39)"],"plain_english_summary":"### What this instrument does\n\nThis is an Airworthiness Directive (AD) titled AD/F28/3 that requires inspection of the speedbrake accumulator mounting brackets on Fokker F28 series aeroplanes. The AD points operators to a specific manufacturer service document for the inspection procedure (Fokker SB F28/53-3). The legal authority cited is the Civil Aviation Regulations 1998, Part 39 (Schedule of Airworthiness Directives). (AD/F28/3; Document: Fokker SB F28/53-3)\n\n### Who it affects\n\n- Owners and operators of Fokker F28 series aeroplanes that have not been modified in accordance with Service Bulletin F28/53-4. (Applicability: All model F28 Series not modified to SB F28/53-4.)\n\n### How it works mechanically\n\n- The AD requires those aircraft falling within the stated applicability to have the speedbrake accumulator mounting brackets inspected in accordance with the referenced Fokker service bulletin (Fokker SB F28/53-3). The AD itself sets the requirement; the service bulletin supplies the inspection steps and technical detail. (AD/F28/3; Document: Fokker SB F28/53-3)\n\n### Who pays and who decides\n\n- The direct financial cost of complying (time for inspection, any remedial work, parts, and labour) falls on the aircraft owner/operator required to perform the inspection and any corrective action. (Applicability: All model F28 Series not modified to SB F28/53-4.)\n- The Civil Aviation Safety Authority enforces the AD under the Civil Aviation Regulations 1998, Part 39; the operator must follow the AD or the approved modification (SB F28/53-4) to be outside the applicability. (Civil Aviation Regulations 1998, PART 39; AD/F28/3)\n\n### Incentives, trade-offs and implementation points to note\n\n- Incentives and compliance choice: Operators can either comply with the inspection mandated by the AD or, if applicable, have previously adopted the SB F28/53-4 modification that removes them from the AD’s applicability. (Applicability: not modified to SB F28/53-4.)\n- Compliance burden: The AD imposes an operational cost (inspection and any repairs) and requires following a separate technical document (Fokker SB F28/53-3). The AD does not itself set inspection detail; it delegates technical steps to the referenced service bulletin, which operators must obtain and follow. (Document: Fokker SB F28/53-3.)\n- Bureaucratic discretion: The AD prescribes a mandatory action under the Civil Aviation Regulations; the referenced service bulletin contains the technical specification. The AD delegates the technical content to the manufacturer document rather than reproducing it in full. (AD/F28/3; Document: Fokker SB F28/53-3.)\n- Opportunity cost and effects on private choice: Time and money spent on inspection/repairs cannot be used elsewhere by operators. Choosing the SB F28/53-4 modification (where available) is an alternative pathway that changes an operator’s compliance obligation. (Applicability: All model F28 Series not modified to SB F28/53-4.)\n\n### Implementation risk and unintended consequences to watch for\n\n- Because the AD relies on an external service bulletin for technical steps, any ambiguity or access issues with that document could delay compliance or create inconsistent implementation across operators. (Document: Fokker SB F28/53-3.)\n- The AD’s carve-out for aircraft modified to SB F28/53-4 means operators must keep modification records current to establish whether the AD applies to a particular aircraft. (Applicability: not modified to SB F28/53-4.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection","history":"/api/acts/ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection/history","analysis":"/api/acts/ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection/analysis","conflicts":"/api/acts/ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection/conflicts","importantCases":"/api/acts/ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection/important-cases","documents":"/api/acts/ad-f28-3-speedbrake-accumulators-mounting-brackets-inspection/documents"}}