{"id":"F2006B04809","name":"AD/BO 105/6 - Fuel Filter Drain Valve","slug":"ad-bo-105-6-fuel-filter-drain-valve","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44599,"registerId":"commonwealth-F2006B04809-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BO 105/6 - Fuel Filter Drain Valve","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nEurocopter BO 105 Series Helicopters\n\nAD/BO 105/6 Fuel Filter Drain Valve 9/86 DM\n\nApplicability: All model BO 105 helicopters fitted with engine fuel filter drain valve P/No P101- 228.\n\nRequirement: Action in accordance with MBB Alert Service Bulletin ASB BO 105-60-101.\n\nNote: German AD 86-148 MBB Refers.\n\nCompliance: Corrective action 1 of Requirement Document:\n\nBefore further flight after 22 August 1986. Corrective action 2 of Requirement Document:\n\nAt each daily inspection after 22 August 1986.\n\nCorrective action 3 of Requirement Document:\n\nThis action may be carried out before further flight after 22 August 1986 in which case corrective actions 1 and 2 need not be complied with.\n\nNote: Corrective action in accordance with action 3 is an interim measure until manufacturer can supply improved drain valves.\n\nBackground: Draining the fuel filters at preflight checks may loosen the handle of the shutoff plunger and under adverse conditions may cause the drain valve to disintegrate.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in a specific aircraft part. It has not expanded beyond its original purpose of mandating inspection/replacement of a faulty fuel filter drain valve."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined term (the part number P101-228)","Simple conditional structure: three alternative compliance paths with clear dates","No cross-references to other legislation beyond a single service bulletin reference","Single applicability criterion (specific helicopter model + specific part)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. It applies to **Eurocopter BO 105 helicopters** that have a specific fuel filter drain valve (part number P101-228).\n\n**The problem:** When pilots drain fuel filters during pre-flight checks, the drain valve's handle can loosen. In bad conditions, this could cause the valve to break apart — a serious safety risk.\n\n**What must be done:**\n- **Immediate fix:** Before flying again after 22 August 1986, owners must follow the manufacturer's service bulletin (ASB BO 105-60-101) to address the issue.\n- **Ongoing check:** At every daily inspection after that date, they must continue specific checks.\n- **Alternative option:** There's a temporary workaround (action 3) that can be done instead of actions 1 and 2, but this is only a stop-gap until better replacement parts become available.\n\n**Who it affects:** Operators and owners of these specific helicopters.\n\n**Why it matters:** This prevents potential fuel leaks or engine failure due to a faulty valve component."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"Scope remains targeted: it applies only to BO 105 helicopters fitted with the specific fuel filter drain valve (P/No P101-228). The instrument imposes inspection and corrective requirements and permits a temporary alternative remedy until improved valves are supplied; it does not broaden applicability beyond that part or model."},"complexity_factors":["Applicability limited to all BO 105 helicopters fitted with engine fuel filter drain valve P/No P101-228 (Applicability).","Mandates compliance with an external document: MBB Alert Service Bulletin ASB BO 105-60-101 (Requirement).","Three corrective actions with different compliance timings: (1) before further flight after 22 Aug 1986; (2) at each daily inspection after 22 Aug 1986; (3) an alternative that may be done before further flight which exempts 1 and 2 (Compliance).","Interim measure: action 3 is explicitly temporary until the manufacturer supplies improved drain valves (Note/Background).","Immediate effective date for some actions (before further flight after 22 Aug 1986) creates potential operational disruption and scheduling constraints (Compliance).","Reliance on manufacturer supply of improved valves creates an external dependency and potential delay in returning to a permanent fix (Note/Background).","Reference to a foreign airworthiness directive (German AD 86-148) indicates cross-jurisdictional alignment but may require cross-referencing (Note)."],"plain_english_summary":"Requires inspections and corrective actions on Eurocopter BO 105 helicopters fitted with engine fuel filter drain valve P/No P101‑228 to prevent the drain valve from disintegrating. Operators must carry out work in accordance with MBB Alert Service Bulletin ASB BO 105‑60‑101.\n\nSome actions must be completed before the next flight, others at each daily inspection; an interim single corrective action may be used in place of the first two until improved valves are supplied."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bo-105-6-fuel-filter-drain-valve","history":"/api/acts/ad-bo-105-6-fuel-filter-drain-valve/history","analysis":"/api/acts/ad-bo-105-6-fuel-filter-drain-valve/analysis","conflicts":"/api/acts/ad-bo-105-6-fuel-filter-drain-valve/conflicts","importantCases":"/api/acts/ad-bo-105-6-fuel-filter-drain-valve/important-cases","documents":"/api/acts/ad-bo-105-6-fuel-filter-drain-valve/documents"}}