{"id":"F2006B09784","name":"AD/F28/5 - Fuel and Hydraulic Valves - Inspection","slug":"ad-f28-5-fuel-and-hydraulic-valves-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54703,"registerId":"commonwealth-F2006B09784-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F28/5 - Fuel and Hydraulic Valves - 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/F28/5 Fuel and Hydraulic Valves - Inspection NK\n\nApplicability: All models S/N 11003 to 11041 and S/N 11991 to 11994 not incorporating SB F28/76-7 and SB F28/28-13.\n\n \n\nDocument: Fokker Alert SB F28/76-3.\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\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The source text sets a targeted applicability and references a specific manufacturer alert SB for procedure. The AD does not indicate any expansion or contraction of scope relative to a prior requirement within the text provided; it defines scope only by the listed serial numbers and exclusions (Applicability) and specifies the procedural document to follow (Document)."},"complexity_factors":["Narrow, serial-number-limited applicability (Applicability) — reduces breadth but requires accurate aircraft identification.","Dependence on an external manufacturer document (Fokker Alert SB F28/76-3) for inspection procedures (Document) — creates a procedural dependency and potential access/interpretation issue.","Exclusions based on prior incorporation of two specific service bulletins (SB F28/76-7 and SB F28/28-13) (Applicability) — requires record checks and verification.","Operational impacts (maintenance scheduling, potential downtime and corrective work) are implied though not detailed in the AD text — operators must translate the SB into work programs.","Limited textual detail in the AD itself about inspection intervals, methods, or follow-up action — those details live in the referenced SB (Document)."],"plain_english_summary":"This AD requires operators of Fokker F28 aircraft with serial numbers 11003–11041 and 11991–11994 (unless they’ve already incorporated SB F28/76‑7 and SB F28/28‑13) to inspect fuel and hydraulic valves using the procedure in Fokker Alert Service Bulletin F28/76‑3. It affects owners, operators and maintenance organisations, creating compliance cost, scheduling burden, and reliance on the manufacturer’s bulletin for the inspection method."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive focused on a specific mechanical inspection for a narrow subset of Fokker F28 aircraft. It represents the standard, original purpose of Airworthiness Directives: addressing specific airworthiness concerns for specific aircraft types without scope creep."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 2 defined applicability criteria (serial number ranges and service bulletin exclusions)","Single cross-reference to manufacturer document (Fokker Alert SB F28/76-3)","No conditional logic or nested exceptions — straightforward applicability test","Standard AD format with minimal regulatory text"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires owners and operators of specific Fokker F28 series aircraft to inspect their **fuel and hydraulic valves**. The directive references a Fokker Alert Service Bulletin (F28/76-3) which contains the detailed inspection instructions.\n\n**Who it affects:** \n- **Aircraft models:** All Fokker F28 series aeroplanes with serial numbers 11003 to 11041, and 11991 to 11994\n- **Exclusions:** Aircraft that have already been modified according to two specific service bulletins (SB F28/76-7 and SB F28/28-13) are exempt from this directive\n\n**Why it matters:** Airworthiness Directives are legally binding safety requirements. If you operate one of these specific aircraft and haven't made the modifications listed in the exemption, you **must** carry out this valve inspection to maintain your aircraft's legal airworthiness certificate. Non-compliance means the aircraft cannot legally fly.\n\n**Key terms explained:**\n- **Service Bulletin (SB):** A technical notice from the aircraft manufacturer recommending modifications or inspections\n- **Airworthiness Directive (AD):** A mandatory regulatory order — unlike service bulletins, compliance is legally required"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f28-5-fuel-and-hydraulic-valves-inspection","history":"/api/acts/ad-f28-5-fuel-and-hydraulic-valves-inspection/history","analysis":"/api/acts/ad-f28-5-fuel-and-hydraulic-valves-inspection/analysis","conflicts":"/api/acts/ad-f28-5-fuel-and-hydraulic-valves-inspection/conflicts","importantCases":"/api/acts/ad-f28-5-fuel-and-hydraulic-valves-inspection/important-cases","documents":"/api/acts/ad-f28-5-fuel-and-hydraulic-valves-inspection/documents"}}