{"id":"F2008L04556","name":"AD/B767/246 - AN-26 Insulation Blankets","slug":"ad-b767-246-an-26-insulation-blankets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":120852,"registerId":"commonwealth-F2008L04556-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 767 Series Aeroplanes","sectionType":"division","heading":"Boeing 767 Series Aeroplanes","content":"### Boeing 767 Series Aeroplanes\n\n| AD/B767/246 | AN-26 Insulation Blankets | 1/2009 |\n| ----------- | ------------------------- | ------ |\n\n| Applicability: | Boeing 767-200 and 767-300 series aircraft, serial numbers as defined in Boeing Special Attention Service Bulletin 767-25-0411. |\n| -------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1. Either:a. Remove all insulation blankets from the pressurized areas of the fuselage and install new insulation blankets using a method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA. The new insulation blankets must comply with 14 Code of Federal Regulations (CFR) 25.856(a). The areas where the affected insulation blankets are installed include, but are not limited to, the following areas:(i) Crown area of the airplane;(ii) Areas behind flight deck panels and circuit breaker panels;(iii) Areas behind sidewalls, lavatories, closets, and galleys;(iv) Cargo compartment areas;(v) Air ducting;(vi) Waste and water tubing; and(vii) Areas attached to the underside of floor panels. ; orb. Remove the existing fuselage insulation blankets and install new insulation blankets, in accordance with the Accomplishment Instructions of the Boeing Special Attention Service Bulletin 767-25-0411.However, these actions are not required for any insulation blanket that is determined not to be constructed of Orcon Orcofilm AN-26, using an identification method approved by the Manager, Seattle Aircraft Certification Office (ACO), FAA or in accordance with Appendix A of Boeing Special Attention Service Bulletin 767-25-0411.2. No person may install any insulation blanket constructed of AN-26 as a replacement unless it has been modified to comply with 14 CFR 25.856(a). |\n\n| | Note 1: Insulation material that is part-marked with a date of manufacture indicating that it was manufactured before July 1981 or after December 1988 is not constructed of AN-26.Note 2: FAA AD 2008-23-09 refers. |\n| ----------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Compliance: | 1. Within 96 months after the effective date of this Airworthiness Directive.2. After the effective date of this Airworthiness Directive. |\n| | This Airworthiness Directive becomes effective on 15 January 2009. |\n| Background: | This Airworthiness Directive results from reports of in-flight and ground fires on certain airplanes manufactured with insulation blankets covered with a specific polyethyleneteraphthalate (PET), ORCON Orcofilm AN-26 (all variants, including AN-26, AN-26A, and AN-26B), which may contribute to the spread of a fire when ignition occurs from sources such as electrical arcing. We are issuing this Airworthiness Directive to ensure that insulation blankets constructed of AN-26 are removed from the fuselage. Such insulation blankets could ignite and propagate a fire that is the result of electrical arcing or sparking. |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n24 November 2008","sortOrder":0},{"sectionNumber":"AD/B767/246","sectionType":"part","heading":"AD/B767/246","content":"## AD/B767/246","sortOrder":1},{"sectionNumber":"AN-26 Insulation Blankets","sectionType":"part","heading":"AN-26 Insulation Blankets","content":"## AN-26 Insulation Blankets","sortOrder":2},{"sectionNumber":"1/2009","sectionType":"part","heading":"1/2009","content":"## 1/2009","sortOrder":3}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive with focused, single-purpose scope. It addresses a specific safety defect (AN-26 insulation fire risk) in a defined aircraft population without expansion into unrelated operational or maintenance areas."},"complexity_factors":["Single technical subject matter (insulation blanket replacement) with clear alternative compliance paths","Only 2 main requirements with a straightforward exception structure","Limited cross-referencing: references one FAA regulation (14 CFR 25.856(a)) and one Boeing service bulletin","Simple conditional logic: date-based exemption (pre-July 1981/post-December 1988) and material identification exemption","Clear applicability criteria limited to specific aircraft serial numbers per Boeing bulletin","Binary compliance structure (remove/replace vs. identify as non-AN-26)","No nested definitions or interpretation sections — terms are used in their ordinary technical sense"],"plain_english_summary":"This AD mandates removal or replacement of flammable Orcon Orcofilm AN-26 insulation from pressurized areas of Boeing 767-200/-300 airplanes built 1981–1988, because the material can ignite and spread fire from electrical arcing. Operators must either strip and install insulation meeting 14 CFR 25.856(a) or follow Boeing’s service bulletin. Insulation proven not to be AN-26 (or outside the 1981–1988 date range) is exempt. New AN-26 may not be installed. Compliance due within 96 months of Jan 15, 2009."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The AD's scope aligns with its stated objective: remove or replace AN-26 insulation on identified Boeing 767-200/300 airframes. It explicitly limits affected parts by serial number (Boeing SB) and excludes blankets identified by manufacture dates (Note 1). The directive covers many fuselage/service areas and sets a 96-month compliance deadline, without expanding beyond the removal/replacement and installation prohibition set out in the Requirement and Background."},"complexity_factors":["Applicability limited to serial numbers defined in Boeing Special Attention Service Bulletin 767-25-0411, requiring cross-reference to external service documentation (Applicability).","Two alternative compliance routes: FAA Seattle ACO approved method or Boeing Service Bulletin instructions, requiring regulatory approval or technical SB compliance (Requirement 1.a/1.b).","Identification challenge: must determine whether material is AN-26 using approved methods or Appendix A of the Boeing SB; manufacture-date marking provides a partial shortcut (Note 1; Requirement 1).","Scope of inspection/removal is broad — multiple internal areas listed (crown, behind panels, sidewalls, cargo, ducting, plumbing, underfloor) increasing labour and access complexity (Requirement 1.a list).","Replacement standard ties to an external federal regulation (14 CFR 25.856(a)), creating certification/parts‑acceptability tasks for installers and suppliers (Requirement 1.a & 2).","Prohibition on installing AN-26 unless modified to meet 14 CFR 25.856(a) creates retrofit or procurement constraints and potential parts-sourcing issues (Requirement 2).","Enforcement/approval discretion rests with the Manager, Seattle ACO, FAA, introducing an administrative decision point for methods and identifications (Requirement 1.a & identification approval).","Long compliance window (96 months) affects scheduling and operational planning but may defer immediate safety work and costs (Compliance 1)."],"plain_english_summary":"Requires operators of specified Boeing 767-200/300 aircraft to remove any fuselage insulation blankets made of Orcon Orcofilm AN-26 and fit replacements that meet the aircraft fire-resistance standard (14 CFR 25.856(a)). Aircraft may use an FAA‑approved identification or follow Boeing Special Attention Service Bulletin 767-25-0411; reinstallation of AN-26 is banned unless modified to comply. Work must be completed within 96 months and covers multiple fuselage and service‑bay locations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b767-246-an-26-insulation-blankets","history":"/api/acts/ad-b767-246-an-26-insulation-blankets/history","analysis":"/api/acts/ad-b767-246-an-26-insulation-blankets/analysis","conflicts":"/api/acts/ad-b767-246-an-26-insulation-blankets/conflicts","importantCases":"/api/acts/ad-b767-246-an-26-insulation-blankets/important-cases","documents":"/api/acts/ad-b767-246-an-26-insulation-blankets/documents"}}