{"id":"F2006B06261","name":"AD/PL 12/15 Amdt 1 - Landing Gear Lower Pivot Lug","slug":"ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47258,"registerId":"commonwealth-F2006B06261-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/15 Amdt 1 - Landing Gear Lower Pivot Lug","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nTransavia PL 12 Series Aeroplanes\n\nAD/PL 12/15\n\nAmdt 1\n\n  \nLanding Gear Lower Pivot Lug 2/89\n\nApplicability: PL 12 and PL 12U:-\n\nFor Para 1 - S/Nos G350 to G465. For Para 2 \\- All S/Nos prior to G466.\n\nRequirement: 1. Visually inspect the outer faces of the landing gear lower pivot lug in the vicinity of the weld joining the reinforcing washer to the lug.\n\n    2. Inspect the landing gear lower pivot lug in accordance with Transavia SB No. 20.\n\n    3. Reinforce each lower pivot lug in accordance with Transavia SB No. 25 or a scheme approved by the Authority.\n\nCompliance: For Para. 1 \\- Daily, until modified.\n\nFor Para. 2 \\- At intervals not exceeding 75 hours time in service until modified. For Para. 3 - Before 1 September 1974.\n\nBackground: This Amendment changes the “Applicability” to reflect design and manufacturing improvements to later model aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment updates the Applicability to distinguish later-model aircraft from earlier ones. The Background states the change reflects design and manufacturing improvements to later models. The AD text specifies serial-number ranges: for Para 1 it applies to S/N G350–G465; for Para 2 it applies to all S/Ns prior to G466. (Applicability; Background)"},"complexity_factors":["Serial-numbered applicability that distinguishes between Para 1 (S/N G350–G465) and Para 2 (all S/N prior to G466) requires operators to verify aircraft identity precisely (Applicability).","Multiple, overlapping compliance timelines (daily visual checks until modified; 75‑hour SB inspections until modified; a fixed deadline for reinforcement) create operational scheduling complexity (Compliance; Requirement 1–3).","Dependence on manufacturer service bulletins (Transavia SB No. 20 and SB No. 25) means technical compliance requires following external technical documents that must be obtained and interpreted correctly (Requirement 2–3).","Regulatory discretion for alternative reinforcement schemes (Authority approval required) introduces an approval process and potential delay/uncertainty for non‑standard repairs (Requirement 3).","The physical inspection task (visual inspection of weld area) is judgment-dependent and may produce variability between inspectors, complicating enforcement and record-keeping (Requirement 1)."],"plain_english_summary":"This directive requires owners/operators of specified Transavia PL‑12 and PL‑12U aeroplanes to inspect and ultimately reinforce the lower landing‑gear pivot lug identified by serial numbers. Until the permanent reinforcement is fitted (per Transavia SB No.25 or a CASA‑approved alternative), operators must do daily visual checks and more detailed inspections at intervals not exceeding 75 flight hours. Operators pay for and carry out the work; reinforcement ends the recurring inspections and CASA must approve any alternative repair."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":true,"description":"The amendment narrows the scope from the original directive. The 'Background' explicitly states this change reflects 'design and manufacturing improvements to later model aircraft' (serial numbers G466 and above). The original AD likely applied to all serial numbers, but Amendment 1 exempts newer aircraft that incorporated the fix at the factory."},"complexity_factors":["Very short document (under 300 words)","Only 3 operative paragraphs with clear, numbered requirements","Simple conditional logic based solely on aircraft serial numbers (G350-G465 vs prior to G466)","No defined terms section — uses plain technical language","Single cross-reference to manufacturer service bulletins (SB No. 20 and 25)","Clear compliance deadlines and intervals (daily, 75 hours, specific date)"],"plain_english_summary":"This is a **safety directive for specific small aircraft** (Transavia PL 12 and PL 12U models) regarding their landing gear.\n\n**What it does:**\n- Requires owners/operators to **inspect and reinforce a specific part** of the landing gear called the \"lower pivot lug\" — essentially a joint where the wheel assembly connects to the plane\n- **Three specific requirements:**\n  1. **Daily visual checks** of the outer faces near a weld (for planes with serial numbers G350 to G465)\n  2. **Detailed inspections every 75 flight hours** using a specific manufacturer bulletin (for all older planes before serial number G466)\n  3. **Mandatory reinforcement** of the part using an approved method before September 1974\n\n**Who it affects:**\n- Owners and operators of Transavia PL 12 series agricultural aircraft (crop dusters/sprayers)\n- Maintenance organisations servicing these specific aircraft\n\n**Why it matters:**\nThe lower pivot lug is a **critical structural component**. If it fails, the landing gear could collapse during takeoff or landing. This directive was issued because the original design had a weakness at the weld point. The amendment updates which aircraft need the inspections based on improved manufacturing in later models (serial G466 onwards).\n\n**Key point:** This is an **updated version (Amendment 1)** that narrows the requirements — newer aircraft (G466 and up) are exempt because the manufacturer fixed the design flaw."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug","history":"/api/acts/ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug/history","analysis":"/api/acts/ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug/analysis","conflicts":"/api/acts/ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug/conflicts","importantCases":"/api/acts/ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug/important-cases","documents":"/api/acts/ad-pl-12-15-amdt-1-landing-gear-lower-pivot-lug/documents"}}