{"id":"F2006B09672","name":"AD/F27/102 - Fuel Tank Ventilation Hose - Inspection and Replacement","slug":"ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115808,"registerId":"commonwealth-F2006B09672-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F27/102 - Fuel Tank Ventilation Hose - Inspection and Replacement","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 F27 Series Aeroplanes\n\n \n\n# AD/F27/102 Fuel Tank Ventilation Hose - Inspection\n\nand Replacement\n\nApplicability: As detailed in Requirement Document. Document:  Fokker SB No. F27/28-55 dated 15 April 1981.\n\nNote: RLD AD 81-19-28 dated 15 April 1981 refers.\n\n \n\nCompliance: Part 1 - Before 1 September 1981.\n\n \n\nPart 2 - Before 31 March 1982.\n\n# 6/81\n\n \n\nBackground:  The manufacturer may inadvertently have supplied non-fuel resistant hose material to operators as replacement for the fuel vent system hoses.\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, time-limited safety directive focused on a specific mechanical defect. It has not expanded beyond its original purpose of addressing the fuel hose material issue."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined compliance deadlines","Single technical reference to external document (Fokker Service Bulletin)","No nested conditional logic or exceptions","Straightforward applicability (single aircraft type)","No interpretation section with defined terms"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of **Fokker F27 series aircraft** to inspect and replace fuel tank ventilation hoses.\n\n**Why it matters:**\nThe manufacturer (Fokker) accidentally supplied hoses that weren't resistant to fuel for use in the aircraft's fuel vent system. This is dangerous because fuel-resistant hoses are critical to prevent leaks, fires, or fuel system failures.\n\n**Who must comply:**\nAnyone operating Fokker F27 aircraft in Australia.\n\n**What must be done:**\n- **Part 1:** Inspect the hoses before 1 September 1981\n- **Part 2:** Complete replacement of non-compliant hoses before 31 March 1982\n\n**Technical reference:**\nOperators must follow Fokker Service Bulletin No. F27/28-55 (dated 15 April 1981) for the exact procedures."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD’s scope remains the same as its stated purpose: require inspection and replacement of fuel tank ventilation hoses for affected Fokker F27 aircraft as specified in Fokker Service Bulletin No. F27/28-55. The instrument does not expand or narrow that scope within the text provided; it delegates technical detail and applicability to the referenced Requirement Document and sets two compliance deadlines (Part 1 and Part 2). (See: Applicability; Document reference; Compliance; Background.)"},"complexity_factors":["References an external Requirement Document (Fokker SB No. F27/28-55) for applicability and technical procedure, requiring operators to consult another document.","Two-part compliance schedule with two separate deadlines (Part 1 before 1 September 1981; Part 2 before 31 March 1982).","Mandatory regulatory nature (an Airworthiness Directive) which creates legal obligations for operators and reduces timing discretion.","Unspecified allocation of parts-costs or manufacturer remedies in the AD text (operators must source/verify correct hoses unless another arrangement exists).","Limited technical detail in the AD itself — the AD delegates procedural specifics to the referenced service bulletin."],"plain_english_summary":"What this instrument does\n\n- This Airworthiness Directive (AD/F27/102) requires operators of certain Fokker F27 series aeroplanes to inspect the fuel tank ventilation hoses and, where necessary, replace them. (See: “AD/F27/102 Fuel Tank Ventilation Hose - Inspection and Replacement”.)\n\nWho it affects\n\n- Aircraft operators and owners of Fokker F27 series aeroplanes identified in the Requirement Document (the applicable fleet is defined in Fokker Service Bulletin No. F27/28-55 dated 15 April 1981). (See: “Applicability: As detailed in Requirement Document. Document: Fokker SB No. F27/28-55 dated 15 April 1981.”)\n\nWhy it matters (mechanics and stated reason)\n\n- The directive responds to a manufacturing/parts-supply problem: the manufacturer may have inadvertently supplied replacement hose material that is not fuel-resistant for the fuel vent system. That creates a risk to the fuel vent system if left uncorrected. (See: “Background: The manufacturer may inadvertently have supplied non-fuel resistant hose material to operators as replacement for the fuel vent system hoses.”)\n\nWhat operators must do and by when\n\n- Follow the inspection and replacement instructions in the referenced Fokker Service Bulletin. The AD splits required work into two parts with hard deadlines: Part 1 must be completed before 1 September 1981; Part 2 must be completed before 31 March 1982. (See: “Compliance: Part 1 - Before 1 September 1981. Part 2 - Before 31 March 1982.”)\n\nWho pays and who decides\n\n- The AD is mandatory under the Civil Aviation Regulations framework (Schedule of Airworthiness Directives). It imposes the action; operators/owners are responsible for carrying out the inspection and replacement work and for associated costs unless another arrangement (e.g. warranty or manufacturer support) applies. (See: heading referencing the Commonwealth and Schedule of Airworthiness Directives.)\n\nPractical effects and implementation notes\n\n- Operators must identify whether their aircraft are in scope by consulting the Requirement Document (Fokker SB No. F27/28-55). (See: Applicability clause.)\n- Maintenance organisations will perform the inspections and replacements; operators will incur labour, parts, and downtime costs. The AD does not specify who supplies replacement parts; it identifies the root cause as potentially incorrect replacement material previously supplied. (See: Background statement.)\n- The AD sets firm compliance dates, leaving limited discretion about timing beyond those deadlines. (See: Compliance dates.)\n\nCosts, incentives and trade-offs (as indicated by the document)\n\n- Direct costs: inspection labour, possible hose replacement parts, aircraft downtime. These are borne by the aircraft operator unless other contractual arrangements exist. (Implied by the AD’s mandatory requirements and use of a manufacturer service bulletin as the procedural means.)\n- Incentives: operators are incentivised to inspect and replace non-fuel-resistant hoses to comply with the AD and to avoid safety or regulatory consequences. The manufacturer’s inadvertent supply of incorrect parts creates an implementation burden for operators to verify and, if necessary, replace those parts. (See: Background.)\n\nRisks and implementation burden\n\n- Implementation risk includes locating and fitting the correct, fuel-resistant hoses called for by the service bulletin and scheduling the work before the stated deadlines. The AD relies on the service bulletin for the technical procedure and on operators to apply it within the prescribed timeframes. (See: Applicability; Compliance; Document reference.)\n\nWhere to find the technical requirements\n\n- The technical inspection and replacement actions are set out in Fokker Service Bulletin No. F27/28-55 dated 15 April 1981; the AD refers operators to that Requirement Document for precise applicability and procedures. (See: Applicability clause.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement","history":"/api/acts/ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement/history","analysis":"/api/acts/ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement/important-cases","documents":"/api/acts/ad-f27-102-fuel-tank-ventilation-hose-inspection-and-replacement/documents"}}