{"id":"F2006B10107","name":"AD/G164/21 - Elevator Pushrods","slug":"ad-g164-21-elevator-pushrods","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":55619,"registerId":"commonwealth-F2006B10107-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/G164/21 - Elevator Pushrods","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)  Schweizer (Grumman) G-164 (Ag-Cat) Series Aeroplanes\n\n \n\nAD/G164/21 Elevator Pushrods 12/89 DM\n\nApplicability: All models.\n\n \n\nRequirement: Action in accordance with Schweizer G164 SB No 85.\n\n \n\nNote: FAA AD 89-18-02, Amendment 39-6300 refers.\n\n \n\nCompliance: Prior to 18 November 1989 and thereafter at periods not exceeding 12 months.\n\n \n\nBackground: The manufacturer has reported corrosion and cracking of the elevator pushrods which in one case led to loss of the aircraft.\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 a specific aircraft type. It has not expanded beyond its original purpose of mandating elevator pushrod inspections for the G-164 Ag-Cat series."},"complexity_factors":["Extremely short document (approximately 150 words)","Only 1 defined term implicitly referenced (the Service Bulletin)","No cross-references to other legislation or regulations beyond a single note about the FAA equivalent","Simple unconditional requirement: inspect per the manufacturer's bulletin","Single compliance deadline with straightforward recurring interval (12 months)","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"**What this is:** An Airworthiness Directive (AD) — essentially a mandatory safety notice issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**Who it affects:** Owners and operators of **Schweizer (Grumman) G-164 \"Ag-Cat\" series aeroplanes** — these are agricultural aircraft (crop dusters/sprayers) used in farming operations across Australia.\n\n**What it requires:** Operators must inspect the **elevator pushrods** (the metal rods that connect the pilot's control stick to the tail elevators, which make the plane pitch up and down) following the manufacturer's Service Bulletin No. 85. This involves checking for **corrosion and cracking** that could cause the pushrods to fail.\n\n**When to comply:** \n- **First check:** Before 18 November 1989\n- **Ongoing:** Every 12 months thereafter\n\n**Why it matters:** The manufacturer reported cases where corroded, cracked elevator pushrods caused **complete loss of an aircraft** (presumably a crash). This AD prevents catastrophic failure by mandating regular inspections of this critical flight control component.\n\n**Key reference:** This aligns with the US Federal Aviation Administration's equivalent directive (FAA AD 89-18-02), showing this was a known international safety issue."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all models of the Schweizer G-164 and mandates recurring action in accordance with Schweizer G164 SB No. 85. The text does not indicate any expansion or narrowing of scope beyond this requirement; it prescribes recurring inspections/repairs for elevator pushrods as a safety measure based on manufacturer reports (Applicability; Requirement; Compliance; Background)."},"complexity_factors":["Short, narrowly focused directive limited to one aircraft type and one component (Applicability; Requirement)","Technical execution is delegated to an external document (Schweizer G164 SB No. 85), creating a dependency on that bulletin for actionable detail (Requirement)","Repeating compliance interval imposed (annual maximum) requires ongoing administrative tracking and maintenance planning (Compliance)","Cross-reference to an FAA AD introduces multi-jurisdictional alignment considerations for some operators (Note)","No detailed inspection/repair criteria in the AD itself reduces legal complexity but increases operational reliance on the service bulletin (Requirement)"],"plain_english_summary":"This airworthiness directive mandates owners/operators of all Schweizer G‑164 (Ag‑Cat) series aeroplanes to carry out the actions in Schweizer G164 Service Bulletin No. 85, initially before 18 November 1989 and thereafter at intervals not exceeding 12 months. It was issued after reported corrosion/cracking of elevator pushrods (including one loss), so recurring inspections and corrective actions are required and costs/facility time fall to operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-g164-21-elevator-pushrods","history":"/api/acts/ad-g164-21-elevator-pushrods/history","analysis":"/api/acts/ad-g164-21-elevator-pushrods/analysis","conflicts":"/api/acts/ad-g164-21-elevator-pushrods/conflicts","importantCases":"/api/acts/ad-g164-21-elevator-pushrods/important-cases","documents":"/api/acts/ad-g164-21-elevator-pushrods/documents"}}