{"id":"F2006B06271","name":"AD/PL 12/6 Amdt 3 - Nose Wheel Pivot Leg","slug":"ad-pl-12-6-amdt-3-nose-wheel-pivot-leg","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47290,"registerId":"commonwealth-F2006B06271-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/6 Amdt 3 - Nose Wheel Pivot Leg","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 12/6\n\nAmdt 3\n\n  \nNose Wheel Pivot Leg 2/89\n\nApplicability: PL 12, PL 12U, PL 12/T320, PL 12/T300 fitted with trailing arm nose wheel assembly.\n\nRequirement: 1. Modify the nose wheel pivot leg by the addition of items -1 to -6 of Transavia Drawing 6-60 Issue B, following the sequence set out in the drawing. This drawing is called up in SB 24.\n\n2. Inspect the nose wheel pivot leg in accordance with Transavia SB No. 24. Compliance: For Para. 1 \\- Within 100 hours time in service after 31 July 1974 but not later than 1\n\nSeptember 1974.\n\nFor Para. 2 \\- At intervals not exceeding 100 hours time in service.\n\nBackground: This Amendment deletes “All models” from the “Applicability” and reflects design and manufacturing improvements to later model aircraft.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment narrows the scope slightly by removing 'All models' from applicability, but this is a standard refinement rather than scope creep. The directive remains tightly focused on its original purpose: ensuring nose wheel pivot leg safety on specific Transavia aircraft."},"complexity_factors":["Very short document (approximately 200 words)","Only 4 defined model variants in applicability section","Simple two-part requirement structure (modification + inspection)","No cross-references to other legislation beyond internal reference to Civil Aviation Regulations 1998 Part 39","Clear, unambiguous compliance deadlines","Single background note explaining the amendment purpose","No nested conditions or exceptions"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific Transavia PL-12 series aircraft.\n\n**What it does:**\n- Requires owners/operators of certain Transavia PL-12 aircraft to **modify the nose wheel pivot leg** (the steering component at the front of the plane) by adding specific parts from a manufacturer drawing.\n- Also requires **regular inspections** of this component every 100 hours of flight time.\n\n**Who it affects:**\n- Owners and operators of PL 12, PL 12U, PL 12/T320, and PL 12/T300 aircraft **that have a trailing arm nose wheel assembly**.\n- Notably, this amendment **removes** \"All models\" from the applicability—meaning later model aircraft that already have design improvements don't need to comply.\n\n**Why it matters:**\n- This is a **safety-critical maintenance requirement**. The nose wheel pivot leg is essential for steering and landing gear function. The directive prevents potential failures that could cause accidents during takeoff, landing, or ground operations.\n- The compliance deadlines were strict (back in 1974 for the modification), reflecting the urgency of the safety issue.\n\n**Key details:**\n- **Compliance deadline for modification:** Within 100 flight hours after 31 July 1974, but no later than 1 September 1974 (historical deadline now long passed).\n- **Ongoing requirement:** Inspection every 100 flight hours.\n- **Source:** Based on manufacturer Service Bulletin (SB) No. 24 and Drawing 6-60 Issue B."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Background explicitly states that this amendment deletes the phrase \"All models\" from the Applicability and reflects design and manufacturing improvements to later model aircraft. Practically, that narrows the AD's scope to specific PL 12 series variants fitted with the trailing-arm nose wheel assembly (Applicability), excluding later models that incorporate the improved design."},"complexity_factors":["Narrow, model-specific applicability (PL 12, PL 12U, PL 12/T320, PL 12/T300) limits scope but requires checking aircraft configuration (Applicability).","One-time modification specified by a particular drawing (Transavia Drawing 6-60 Issue B) with an enforced sequence increases technical specificity (Requirement 1).","Reference to external procedural material (Transavia SB No. 24) for inspection and modification methods means implementers must obtain and follow manufacturer documents (Requirement; SB 24 reference).","Time-limited compliance window for the initial modification (within 100 hours after 31 July 1974, not later than 1 Sept 1974) creates scheduling pressure (Compliance for Para. 1).","Recurring inspection interval (every 100 hours) imposes ongoing maintenance planning and cost (Compliance for Para. 2).","The AD contains limited technical detail itself, delegating method to the drawing and SB, which concentrates complexity in external documents (Requirement; SB 24 reference)."],"plain_english_summary":"This AD requires owners/operators of specified Transavia PL 12-series aeroplanes fitted with the trailing‑arm nose wheel to modify the nose‑wheel pivot leg exactly per Transavia Drawing 6‑60 Issue B and to carry out recurring inspections per Transavia SB No. 24. Inspections must occur at intervals not exceeding 100 hours TIS.\n\nIt affects the listed aircraft and the maintenance organisations that perform the work; owners/operators bear parts, labour and downtime costs. Later models with design improvements are excluded."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-6-amdt-3-nose-wheel-pivot-leg","history":"/api/acts/ad-pl-12-6-amdt-3-nose-wheel-pivot-leg/history","analysis":"/api/acts/ad-pl-12-6-amdt-3-nose-wheel-pivot-leg/analysis","conflicts":"/api/acts/ad-pl-12-6-amdt-3-nose-wheel-pivot-leg/conflicts","importantCases":"/api/acts/ad-pl-12-6-amdt-3-nose-wheel-pivot-leg/important-cases","documents":"/api/acts/ad-pl-12-6-amdt-3-nose-wheel-pivot-leg/documents"}}