{"id":"F2006B11077","name":"AD/LA-4/3 Amdt 1 - Flap Pushrod Bearings - Inspection and Replacement","slug":"ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56725,"registerId":"commonwealth-F2006B11077-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/LA-4/3 Amdt 1 - Flap Pushrod Bearings - Inspection and Replacement","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)  Consolidated Aeronautics, Colonial and LA-4 Series Aeroplanes\n\n \n\nAD/LA-4/3\n\nAmdt 1\n\n\nFlap Pushrod Bearings - Inspection and Replacement\n\n\n1/73\n\n \n\nApplicability: All Colonial C1 and C2, and Lake LA-4 and LA-4-200 models with 2-7811-7 pushrod assemblies installed which are not fitted with Heim HM-5G (Magnafluxed) rod ends.\n\n \n\nDocument: Consolidated Aeronautics SL No. 39A.\n\n \n\nCompliance: Within 15 hours time in service after 5 January 1973, unless already accomplished within the last 10 hours time in service, and thereafter at intervals not exceeding 25 hours time in service.\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 discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection/replacement of flap pushrod bearings."},"complexity_factors":["Very short document (approximately 150 words)","Only 4 defined elements: specific aircraft models, part number, rod end specification, and compliance timeframes","Single compliance pathway with straightforward time-in-service calculations","No cross-references to other legislation or regulations beyond the enabling Civil Aviation Regulations 1998","Simple conditional logic: applies only if aircraft has specific part AND lacks specific upgrade","No nested exceptions or sub-delegations"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of specific light aircraft to inspect and replace faulty flap pushrod bearings.\n\n**What it does:**\n- **Targets:** Colonial C1/C2 and Lake LA-4/LA-4-200 aircraft that have a specific type of pushrod assembly (part number 2-7811-7) **and** do not already have upgraded Heim HM-5G rod ends (which have been Magnafluxed — a type of crack-detection testing).\n- **Requires:** Inspection and replacement of these flap pushrod bearings.\n- **When:** First inspection must happen within 15 hours of flying time after 5 January 1973, unless it was already done in the previous 10 hours. After that, checks must occur every 25 flight hours.\n\n**Why it matters:**\nFlap pushrods control the flaps — the moving surfaces on wings that help aircraft slow down for landing. If these bearings fail, the pilot could lose control of the flaps, creating a serious safety risk during critical phases of flight. This directive forces a fix before catastrophic failure occurs.\n\n**Who must comply:**\nAircraft owners, operators, and maintenance engineers responsible for these specific Colonial and Lake aircraft models."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled as Amendment 1 to AD/LA-4/3 (Amdt 1), indicating it modifies a prior directive. The supplied text is the amended directive itself but does not include the previous version, so the specific scope changes from the original AD cannot be determined from this excerpt alone."},"complexity_factors":["Narrow, model-specific applicability with a precise part-number condition (2-7811-7 pushrod assemblies) and a positive exemption (Heim HM-5G Magnafluxed rod ends) (Applicability).","A conditional initial compliance window (within 15 hours after a fixed date, unless already done within the last 10 hours) followed by a short recurring interval (<=25 hours), which imposes frequent operational scheduling (Compliance).","Reference to an external technical document (Consolidated Aeronautics SL No. 39A) for procedural detail rather than including inspection/replacement steps in the AD text (Document).","Legal framing under the Schedule of Airworthiness Directives (Part 39) which makes the requirement formal and compulsory rather than advisory (header), but the AD itself is brief and narrowly focused.","Technical subject-matter (aircraft pushrod bearings) requires mechanical expertise to implement despite the AD's textual simplicity."],"plain_english_summary":"This directive requires owners/operators of Colonial C1/C2 and Lake LA‑4/LA‑4‑200 aeroplanes with 2‑7811‑7 pushrod assemblies (unless fitted with Heim HM‑5G Magnafluxed rod ends) to carry out inspections — and replace bearings when indicated — following Consolidated Aeronautics SL No. 39A. The first inspection is due within 15 hours TIS after 5 Jan 1973 (unless recently done), then every 25 hours TIS. Costs and downtime fall to operators, creating an incentive to retrofit the exempt rod ends."}},"importantCases":[],"_links":{"self":"/api/acts/ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement","history":"/api/acts/ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement/history","analysis":"/api/acts/ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement/analysis","conflicts":"/api/acts/ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement/conflicts","importantCases":"/api/acts/ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement/important-cases","documents":"/api/acts/ad-la-4-3-amdt-1-flap-pushrod-bearings-inspection-and-replacement/documents"}}