{"id":"F2006B06264","name":"AD/PL 12/18 Amdt 1 - Landing Gear Oleo Assemblies","slug":"ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47267,"registerId":"commonwealth-F2006B06264-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PL 12/18 Amdt 1 - Landing Gear Oleo Assemblies","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 12/18\n\nAmdt 1\n\n  \nLanding Gear Oleo Assemblies 13/89\n\nApplicability: 1. All models fitted with oleo type landing gear.\n\n2. All models fitted with rod end type oleo landing gear main P/N 6-58, nose P/N 6- 57.\n\nRequirement: For 1: Action in accordance with Transavia S.B. No 29.\n\nFor 2: Action in accordance with Transavia S.B. No 29 Addendum dated 17 October 1989. Inspect rod end fittings P/N 6-78 for evidence of cracking, particularly in the grease nipple area.\n\nNote: Cracked fittings are to be replaced before further flight.\n\nCompliance: Unless already accomplished \\- Prior to further flight after 31 December 1989 and thereafter at intervals not exceeding 100 hours time in service.\n\nBackground: The initial issue of this Directive required a dimension check of the oleo assemblies, referencing Transavia S.B. No 29. Amendment 1 has been issued referencing also an addendum to S.B. No 29 dated 17 October 1989 which details dimensions for the rod end type oleo. An inspection of the rod end fittings is also required. An aircraft fitted with this type oleo has entered Australia. Cracking of the rod ends has been reported.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 1 to an existing directive. The amendment expanded the scope slightly by adding the rod end type oleo inspection requirement after an aircraft with that configuration entered Australia and cracking was reported. However, this represents a natural evolution within the original safety purpose (ensuring landing gear integrity) rather than scope creep beyond the directive's intent. The original and amended versions both address the same fundamental issue: preventing landing gear failure on Transavia PL-12 aircraft."},"complexity_factors":["Short, single-purpose directive (approximately 250 words)","Only 2 defined applicability categories with specific part numbers","Simple conditional structure: two distinct requirements based on gear type","Single cross-reference to external technical document (Transavia Service Bulletin No. 29 and its addendum)","Clear compliance deadline and recurring interval (100 hours)","No nested exceptions or complex legal definitions","Technical aviation terminology present but explained through context (oleo, rod end, P/N numbers)"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and repairs of oleo landing-gear assemblies on Transavia PL-12 aeroplanes (standard and rod-end types, including main gear P/N 6-58 and nose gear P/N 6-57). Operators must follow Transavia Service Bulletin No. 29, and for rod-end gear also the 17 Oct 1989 addendum, inspecting rod-end fittings (P/N 6-78) for cracks around the grease nipple and replacing any cracked parts before flight.\n\nInspections are required before flying after 31 Dec 1989 and every 100 flight hours thereafter."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Yes. The original Directive required a dimension check of the oleo assemblies (per S.B. No.29). Amendment 1 adds reliance on the S.B. No.29 addendum (17 October 1989) that details rod‑end dimensions and introduces a specific inspection requirement for rod‑end fittings P/N 6‑78 for cracking (particularly at the grease nipple), plus the accompanying compliance schedule."},"complexity_factors":["Reference to external documents (Transavia S.B. No.29 and 17 Oct 1989 addendum) creates dependency on non‑statutory material for the detailed procedure.","Two applicability categories: general oleo type gear and specific rod‑end type with distinct part numbers (main P/N 6‑58, nose P/N 6‑57, rod end P/N 6‑78).","Specific inspection focus (grease nipple area) requires targeted visual/technical checks.","Clear compliance timing: one-off action before further flight after 31 Dec 1989 plus recurrent inspections at intervals not exceeding 100 hours TIS.","Mandatory replacement before further flight if cracking is found imposes immediate component/maintenance costs and possible grounding.","Operational identification burden for operators to determine fitted parts and to follow the correct Service Bulletin/addendum."],"plain_english_summary":"Amendment 1 requires operators of Transavia PL‑12 series and any aeroplanes fitted with the specified oleo landing gear to inspect those oleo assemblies in line with Transavia Service Bulletin No. 29 and its 17 October 1989 addendum. Rod‑end fittings P/N 6‑78 must be checked (especially around the grease‑nipple) and replaced before further flight if cracked; inspections are required before first flight after 31 December 1989 and then every 100 flight hours. The operator pays for inspections/replacements; CASA enforces the directive."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies","history":"/api/acts/ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies/history","analysis":"/api/acts/ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies/analysis","conflicts":"/api/acts/ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies/conflicts","importantCases":"/api/acts/ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies/important-cases","documents":"/api/acts/ad-pl-12-18-amdt-1-landing-gear-oleo-assemblies/documents"}}