{"id":"F2006B11291","name":"AD/ML-M4/5 - Rudder Trim Tab Control - Modification","slug":"ad-ml-m4-5-rudder-trim-tab-control-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":57106,"registerId":"commonwealth-F2006B11291-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ML-M4/5 - Rudder Trim Tab Control - 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)  Maule M-4 Series Aeroplanes\n\n \n\nAD/ML-M4/5 Rudder Trim Tab Control - Modification 7/68\n\nApplicability: All models with S/Nos. 3 to 94, 1C to 10C, 1S to 3S, 1T to 3T, 1001 to 1045, 1001C to 1064C, 2001S to 2003S and 2001C to 2006C.\n\n \n\nDocument: Maule SL No. 14.\n\n \n\nCompliance: Within 50 hours time in service after 11 July 1968.\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\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":1,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive issued in 1968 (as indicated by the '7/68' suffix and the compliance date). It addresses a specific technical issue in a specific aircraft type. There is no indication of scope creep; it remains precisely focused on the rudder trim tab control modification for the identified Maule M-4 series aircraft."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single, unambiguous compliance requirement (perform modification within 50 hours)","Clear applicability criteria (specific serial number ranges)","Single referenced document (Maule Service Letter No. 14)","No conditional logic, exceptions, or nested provisions"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific **Maule M-4 series aeroplanes** to modify the **rudder trim tab control** system.\n\n**Who it affects:**\n- Owners and operators of Maule M-4 aircraft with specific serial numbers (ranging from early production models 3-94 through various letter-designated series up to 2006C).\n\n**What it requires:**\n- A modification to the rudder trim tab control system must be carried out according to **Maule Service Letter No. 14** (the manufacturer's official instruction for this fix).\n- This work must be completed **within 50 hours of flying time** after 11 July 1968.\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety requirements. They are issued when a design flaw, maintenance issue, or operational problem is discovered that could affect flight safety. Non-compliance means the aircraft cannot legally fly. This particular directive addresses a specific control system issue that, if unaddressed, could potentially affect the aircraft's handling or safety."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text of this directive sets a clear, limited scope: a mandated modification to the rudder trim tab control for specified Maule M-4 serial numbers, using Maule SL No. 14, to be completed within 50 hours TIS after 11 July 1968 (Applicability; Document; Compliance). The document itself does not indicate any change to that scope from an earlier or original instrument; no scope amendments or extensions are present in the supplied text."},"complexity_factors":["Narrow, specific applicability defined by multiple serial-number ranges (Applicability) — requires careful fleet identification.","Short, fixed compliance window tied to a historical date: \"within 50 hours time in service after 11 July 1968\" (Compliance) — creates an acute scheduling constraint for operators.","No technical detail in the AD itself; compliance depends on an external document (Maule SL No. 14) which implementers must obtain and follow (Document).","No procedural text about approvals, acceptable alternatives, or record-keeping in the AD, increasing reliance on external guidance or regulatory interpretation.","Historical vintage (dated 1968) may complicate locating the referenced service letter or parts/techniques today (implicit from Compliance date and Document reference)."],"plain_english_summary":"The AD requires owners/operators of specified Maule M‑4 serial-numbered aeroplanes to modify the rudder trim tab control per Maule Service Letter No. 14.  \n\nWork must be completed within 50 hours time‑in‑service after 11 July 1968; the AD gives the compliance deadline and reference only, so operators must obtain and follow the manufacturer’s service letter and bear the cost."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ml-m4-5-rudder-trim-tab-control-modification","history":"/api/acts/ad-ml-m4-5-rudder-trim-tab-control-modification/history","analysis":"/api/acts/ad-ml-m4-5-rudder-trim-tab-control-modification/analysis","conflicts":"/api/acts/ad-ml-m4-5-rudder-trim-tab-control-modification/conflicts","importantCases":"/api/acts/ad-ml-m4-5-rudder-trim-tab-control-modification/important-cases","documents":"/api/acts/ad-ml-m4-5-rudder-trim-tab-control-modification/documents"}}