{"id":"F2006B06256","name":"AD/PL 12/10 - Engine Mount Tube - Inspection","slug":"ad-pl-12-10-engine-mount-tube-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47243,"registerId":"commonwealth-F2006B06256-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/10 - Engine Mount Tube - Inspection","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 12/10 Engine Mount Tube - Inspection 4/73\n\nApplicability: All models with S/Nos. prior to 1249 in addition to S/No. G351, not incorporating SL No. 21.\n\n \n\nDocument: Transavia SB No. 22.\n\n \n\nCompliance: As detailed in the requirement document.\n\n \n\nNote: The pilot may perform and certify for the daily inspection.\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, targeted safety directive addressing a specific airworthiness concern on a specific aircraft type. It has not expanded beyond its original purpose of mandating engine mount tube inspections."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 4 operative provisions: applicability, document reference, compliance method, and pilot certification note","Single cross-reference to external document (Transavia SB No. 22) — actual technical requirements contained there, not in the legislative text itself","Simple conditional logic: applies to specific serial number range plus one outlier (G351), minus those with SL No. 21 incorporated","No defined terms section — relies on standard aviation terminology (S/No., SL, SB)","No nested exceptions or conditional sub-clauses within the legislative text"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations 1998. Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific **Transavia PL 12 series aeroplanes** to inspect the **engine mount tube** (the structural component that attaches the engine to the airframe). This inspection is to check for cracks, corrosion, or other defects that could cause the engine to detach in flight.\n\n**Who it affects:** \n- **Aircraft owners/operators** of Transavia PL 12 models with **serial numbers before 1249**, plus specifically **serial number G351**\n- **Excludes** aircraft that have already incorporated **Service Letter (SL) No. 21** (a manufacturer modification that fixes the problem)\n\n**What must be done:**\n- Follow the inspection procedures in **Transavia Service Bulletin No. 22**\n- The **daily inspection** (a routine pre-flight check) can be done and signed off by the **pilot themselves** — they don't need a licensed aircraft maintenance engineer for this particular check\n\n**Why it matters:** Engine mount failures are catastrophic. This AD ensures potentially dangerous structural fatigue is caught before it causes an accident. The pilot-performed daily inspection provision makes compliance practical for rural or remote operators without immediate access to maintenance facilities."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The source text specifies the applicability (serial-number-limited) and requires compliance with Transavia SB No. 22; it does not indicate any change from a prior scope or original intent. No information in the directive text itself describes an alteration of scope from an earlier instrument."},"complexity_factors":["Short, narrowly targeted applicability by specific serial numbers (Applicability).","No procedural detail in the AD itself; compliance depends on an external document (Transavia SB No. 22) (Document; Compliance).","Explicit allowance for pilot to perform and certify the daily inspection shifts implementation detail to operator practices (Note).","Regulatory authority and enforcement are standard (Part 39 header), so legal complexity is low but operational dependence on the SB introduces practical variability (header; Document)."],"plain_english_summary":"The AD mandates inspection of the engine‑mount tube on specified Transavia PL‑12 aeroplanes (S/Ns before 1249 and G351 unless Service Letter No. 21 is embodied) by following Transavia Service Bulletin No. 22. It’s enforced under CASA’s Part 39 framework.\n\nThis affects owners/operators (and pilots, who may perform and certify the daily check) and shifts inspection costs and responsibility onto them; corrective work follows the SB and normal maintenance rules."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-10-engine-mount-tube-inspection","history":"/api/acts/ad-pl-12-10-engine-mount-tube-inspection/history","analysis":"/api/acts/ad-pl-12-10-engine-mount-tube-inspection/analysis","conflicts":"/api/acts/ad-pl-12-10-engine-mount-tube-inspection/conflicts","importantCases":"/api/acts/ad-pl-12-10-engine-mount-tube-inspection/important-cases","documents":"/api/acts/ad-pl-12-10-engine-mount-tube-inspection/documents"}}