{"id":"F2006B06128","name":"AD/PC-6/25 Amdt 1 - Aileron Balance Weight Arms - Inspection","slug":"ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":46902,"registerId":"commonwealth-F2006B06128-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PC-6/25 Amdt 1 - Aileron Balance Weight Arms - 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)  Pilatus Porter PC-6 Series Aeroplanes\n\n \n\nAD/PC-6/25\n\nAmdt 1\n\n\nAileron Balance Weight Arms - Inspection 11/72\n\n \n\nApplicability: All models fitted with aileron mass balance weight assembly P/No. 6106.11. Document:               Pilatus SB No. 89A.\n\nCompliance: Within 100 hours time in service after 30 November 1972 and there- after at intervals not exceeding 100 hours time in service until replaced by aileron balance weight assembly P/No. 111.45.08.001.\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 historical Airworthiness Directive from 1972 (reference 11/72) with a single amendment. It remains tightly focused on its original purpose: addressing a specific mechanical defect in a particular aircraft type. The amendment appears to be a routine update to the original directive rather than an expansion of scope."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined references (part numbers 6106.11 and 111.45.08.001)","Single, clear compliance pathway with no nested conditions or exceptions","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Straightforward temporal trigger (100 hours time in service) with simple repetition interval","Binary applicability test (fitted with specific part number or not)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\nOrders owners and operators of **Pilatus Porter PC-6 series aeroplanes** to inspect the **aileron balance weight arms** — these are metal components that help keep the aircraft's control surfaces (the ailerons, which make the plane roll left or right) stable during flight.\n\n**Why it matters:**\nThe specific part number mentioned (6106.11) had a safety issue. If these balance weight arms fail, the pilot could lose control of the aircraft. This AD mandates regular inspections every 100 flight hours until the faulty part is replaced with an improved version (part number 111.45.08.001).\n\n**Who it affects:**\n- Owners and operators of all Pilatus PC-6 aircraft fitted with the specified balance weight assembly\n- Maintenance engineers servicing these aircraft\n\n**Key requirements:**\n- **First inspection:** Within 100 flight hours after 30 November 1972\n- **Ongoing:** Repeat inspection every 100 flight hours thereafter\n- **End point:** Continue until the old part is replaced with the new, improved part"},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The text of Amendment 1 as supplied sets out a specific inspection requirement, applicability, and a terminating replacement part number. The supplied text does not show any change to the applicability or inspection interval within this instrument itself, so no change of scope is apparent from the material provided."},"complexity_factors":["Narrow applicability: applies only to aircraft fitted with a specific part number (P/No. 6106.11). (Applicability)","Single clear compliance rule: inspection every 100 hours time in service with a defined start date and a defined terminating condition (replacement by P/No. 111.45.08.001). (Compliance)","Technical procedure delegated to an external document (Pilatus SB No. 89A) rather than set out in the AD, requiring cross-reference. (Document)","Age and legacy scheduling: start date referenced to 30 November 1972, which may require owners to interpret historical compliance timing for legacy aircraft. (Compliance)","Limited regulatory text: the AD specifies requirement and intervals but does not state enforcement details, alternative compliance mechanisms, or remedies—relying on the broader regulatory framework. (Header)"],"plain_english_summary":"This AD mandates recurring inspections of aileron mass balance weight arms P/No. 6106.11 on Pilatus PC‑6 aeroplanes, using Pilatus Service Bulletin No. 89A, starting within 100 hours TIS after 30 Nov 1972 and every 100 hours thereafter until the assembly is replaced by P/No. 111.45.08.001. It affects aircraft owners/operators and maintenance organisations, creating a trade‑off between ongoing inspection costs and a one‑time replacement to avoid further inspections."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection","history":"/api/acts/ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection/history","analysis":"/api/acts/ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection/analysis","conflicts":"/api/acts/ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection/conflicts","importantCases":"/api/acts/ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection/important-cases","documents":"/api/acts/ad-pc-6-25-amdt-1-aileron-balance-weight-arms-inspection/documents"}}