{"id":"F2006B06272","name":"AD/PL 12/7 - Fuel Tank - Modification","slug":"ad-pl-12-7-fuel-tank-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47293,"registerId":"commonwealth-F2006B06272-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/7 - Fuel Tank - 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\n![](image.001.png)  Transavia PL 12 Series Aeroplanes\n\n \n\nAD/PL 12/7 Fuel Tank - Modification 9/70\n\nApplicability: All models not incorporating Transavia Mod. No. 95.\n\n \n\nRequirement: Modify the fuel tank installations in accordance with Transavia Modification No. 95 or an alternative approved means of ensuring continuous fuel feed in the extreme manoeuvre attitudes likely be to encountered in agricultural operations.\n\n \n\nCompliance: Before 31 December 1970.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound airworthiness directive with a narrow, specific scope (fuel tank modifications for one aircraft series). It has not expanded beyond its original safety purpose."},"complexity_factors":["Extremely short document (under 150 words)","Only 4 operative elements: applicability, requirement, compliance deadline, and reference to external technical standard (Transavia Mod. No. 95)","No defined terms section","No cross-references to other legislation beyond parent regulation (CAR 1998 Part 39)","Single condition: 'All models not incorporating Transavia Mod. No. 95'","Plain language requirement with only one technical alternative ('alternative approved means')","No nested exceptions or conditional logic"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:** Requires owners or operators of Transavia PL 12 series aeroplanes (agricultural aircraft) to modify their fuel tank systems. Specifically, they must either:\n- Install **Transavia Modification No. 95**, OR\n- Use another method approved by CASA that ensures fuel keeps flowing to the engine even when the plane is flying in extreme positions (like steep turns or dives during crop-dusting).\n\n**Who it affects:** Anyone operating a Transavia PL 12 aircraft that hasn't already been fitted with Modification No. 95.\n\n**Why it matters:** Agricultural flying involves sharp manoeuvres at low altitude. Without this modification, fuel could stop reaching the engine during these extreme attitudes, causing engine failure — potentially catastrophic when spraying crops close to the ground. The deadline was 31 December 1970, meaning this was a retrospective safety fix for existing aircraft.\n\n**Key point:** This is a **one-off technical mandate**, not ongoing legislation. It creates a legal obligation for specific aircraft owners to make a physical modification by a fixed date."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive's scope, as stated in the text, applies to all Transavia PL 12 series aeroplanes not already modified by Transavia Mod. No. 95 and requires modification or an approved alternative to ensure continuous fuel feed in the extreme manoeuvre attitudes likely in agricultural operations, to be completed before 31 December 1970. There is no indication within the instrument text that the scope differs from that stated purpose, so the scope has not changed from the directive's expressed intent. (Applicability; Requirement; Compliance)"},"complexity_factors":["Clear, narrow applicability (all models not already incorporating Transavia Mod. No. 95). (Applicability)","Single technical outcome required (continuous fuel feed in extreme manoeuvre attitudes), but the directive does not include technical drawings or procedural steps — implementers must use Mod No. 95 documentation or seek approval for an alternative. (Requirement)","An approval path for alternatives introduces administrative discretion and potential variability in timelines. (Requirement)","A fixed compliance deadline concentrates scheduling and supply risks for owners/operators. (Compliance)","No additional enforcement or penalty detail in the text increases reliance on external enforcement practice and interpretation (implicit complexity in execution)."],"plain_english_summary":"This directive requires owners/operators of Transavia PL 12 series aircraft to install Transavia Modification No. 95 (or an authority‑approved equivalent) to ensure continuous fuel feed during extreme attitudes encountered in agricultural flying. Affects operators and maintenance organisations, who must fund and carry out the work (or obtain approval for an alternative) by 31 December 1970; it raises short‑term costs and downtime to reduce fuel‑starvation risk."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-7-fuel-tank-modification","history":"/api/acts/ad-pl-12-7-fuel-tank-modification/history","analysis":"/api/acts/ad-pl-12-7-fuel-tank-modification/analysis","conflicts":"/api/acts/ad-pl-12-7-fuel-tank-modification/conflicts","importantCases":"/api/acts/ad-pl-12-7-fuel-tank-modification/important-cases","documents":"/api/acts/ad-pl-12-7-fuel-tank-modification/documents"}}