{"id":"F2006B04535","name":"AD/BELL 206/85 Amdt 1 - Fuel Filter and Hoses Installation - Modification","slug":"ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114251,"registerId":"commonwealth-F2006B04535-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BELL 206/85 Amdt 1 - Fuel Filter and Hoses Installation - Modification","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\nBell Helicopter Textron Canada (BHTC) 206 and Agusta Bell 206 Series Helicopters\n\n \n\nAD/BELL 206/85\n\nAmdt 1\n\n\nFuel Filter and Hoses Installation - Modification\n\n\n9/81\n\n \n\nApplicability: All models Bell 206L-1 with S/Nos. 45154 to 45448 except as noted in Bell ASB 206L-80-13, and single pilot IFR equipped models listed in ASB 206L-81-19.\n\n \n\nDocument: Bell SB 206L-80-13 & for single pilot IFR helicopters Bell SB 206L-81-19.\n\n \n\nNote: FAA AD 81-06-05 refers.\n\n \n\nCompliance: Within 100 hours time in service after 30 September 1981.\n\n \n\nBackground: The Airworthiness Directive is amended to include a modification to the freewheeling vent hose on single pilot IFR equipped helicopters.\n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a narrow, technical amendment to an existing Airworthiness Directive. The original AD addressed fuel filter and hose installations; Amendment 1 simply adds one additional component (freewheeling vent hose) for a specific subset of aircraft (single-pilot IFR equipped). The scope remains tightly focused on fuel system safety modifications for the Bell 206L-1 helicopter series."},"complexity_factors":["Very short document (under 200 words)","Only 2 defined applicability groups (serial number range + IFR-equipped models)","Single cross-reference to FAA AD 81-06-05 (informational only)","Simple compliance deadline (100 hours time in service after fixed date)","No nested conditions or exceptions beyond the serial number exclusion"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific helicopters.\n\n**What it does:**\nRequires owners and operators of certain Bell 206L-1 helicopters to modify the **fuel filter and hoses installation**. Specifically, Amendment 1 adds a requirement to also modify the **freewheeling vent hose** on helicopters equipped for single-pilot flying in poor weather conditions (IFR = Instrument Flight Rules).\n\n**Who it affects:**\n- Bell 206L-1 helicopters with serial numbers 45154 to 45448 (with some exceptions noted in a Bell service bulletin)\n- Single-pilot IFR-equipped models of the same helicopter type\n\n**Why it matters:**\nFuel system modifications are critical for preventing engine failure due to fuel starvation or contamination. The vent hose modification specifically addresses a safety issue for helicopters flying in instrument conditions with only one pilot — a high-workload situation where system failures are especially dangerous.\n\n**What must be done:**\nOperators must complete the modifications within **100 hours of flight time** after 30 September 1981, following technical instructions in Bell Service Bulletins 206L-80-13 and 206L-81-19."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The amendment expands the original directive by adding a required modification to the freewheeling vent hose for single‑pilot IFR equipped helicopters. The original instrument applied to fuel filter and hoses installation for specified Bell 206L-1 serial numbers; the amendment explicitly extends that set of required works to include the vent hose modification on the single‑pilot IFR models listed in Bell SB 206L-81-19. (Background; Applicability; Document)"},"complexity_factors":["Narrow, specific applicability by model and serial number (Applicability)","Dependence on external technical documents (Bell SB 206L-80-13 and SB 206L-81-19) to define the modification (Document)","A fixed, short compliance window (100 hours TIS after 30 September 1981) that creates scheduling urgency (Compliance)","An amendment that adds a targeted modification for single‑pilot IFR helicopters (Background)","Reference to an external regulator's AD (FAA AD 81-06-05), requiring cross-checking of related directives (Note)"],"plain_english_summary":"The Civil Aviation Safety Authority requires a mechanical modification to fuel filter and hose installations on specified Bell 206L‑1 helicopters (serials 45154–45448 and certain single‑pilot IFR models). Compliance must follow Bell Service Bulletins SB 206L‑80‑13 (and SB 206L‑81‑19 where applicable) within 100 hours time‑in‑service after 30 September 1981.\n\nAffected owners/operators must arrange and pay for the work; the AD narrows impact to a specific subset of the fleet and directs compliance to the manufacturer’s service bulletins."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification","history":"/api/acts/ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification/history","analysis":"/api/acts/ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification/analysis","conflicts":"/api/acts/ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification/conflicts","importantCases":"/api/acts/ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification/important-cases","documents":"/api/acts/ad-bell-206-85-amdt-1-fuel-filter-and-hoses-installation-modification/documents"}}