{"id":"F2006B06241","name":"AD/PITTS S-2/12 - Front Horizontal Stabiliser Support Tube - Modification","slug":"ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":47195,"registerId":"commonwealth-F2006B06241-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/PITTS S-2/12 - Front Horizontal Stabiliser Support Tube - Modification","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)  Pitts S-1 and S-2 Series Aeroplanes\n\n \n\nAD/PITTS S-2/12  Front Horizontal Stabiliser Support Tube - Modification\n\nApplicability: All model S-1S with S/Nos. 1-001 to 1-0060. Document:  Pitts Aerobatics SB No. 14.\n\nCompliance: Within 100 hours time in service after 31 December 1980.\n\n \n\nBackground:  The manufacturer advises that cracks have been found in the front horizontal stabiliser support tube on factory completed aeroplanes.\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\n3/81\n","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1406},"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"Remains focused on the original specific safety issue regarding the stabiliser support tube on the specified aircraft models."},"complexity_factors":["Single-page directive with no interpretation section or defined terms","Simple applicability criteria limited to specific aircraft serial numbers","Single compliance action referencing one external service bulletin","Straightforward deadline calculation (fixed date plus flight hours)","No exceptions, exemptions, or conditional provisions"],"plain_english_summary":"**What this is:** A mandatory safety order (called an Airworthiness Directive) issued by the aviation regulator requiring specific aircraft owners to fix a dangerous mechanical defect.\n\n**Who it affects:** Owners and operators of **Pitts S-1S aerobatic aircraft** with serial numbers 1-001 through 1-0060.\n\n**What you must do:** Modify the **front horizontal stabiliser support tube** (a structural part connecting the tail to the fuselage). You must follow the instructions in **Pitts Aerobatics Service Bulletin No. 14**.\n\n**Why:** The manufacturer discovered cracks in this tube on factory-built aircraft. If left unfixed, the tube could fail and cause loss of control of the aircraft.\n\n**When:** Within **100 hours of flight time** after 31 December 1980 (if not already done)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification","history":"/api/acts/ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification/history","analysis":"/api/acts/ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification/analysis","conflicts":"/api/acts/ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification/conflicts","importantCases":"/api/acts/ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification/important-cases","documents":"/api/acts/ad-pitts-s-2-12-front-horizontal-stabiliser-support-tube-modification/documents"}}