{"id":"F2006B06869","name":"AD/SD3-60/25 - Shock Absorber Pin Locking Bolt","slug":"ad-sd3-60-25-shock-absorber-pin-locking-bolt","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114749,"registerId":"commonwealth-F2006B06869-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/25 - Shock Absorber Pin Locking Bolt","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)  Short SD3-60 Series Aeroplanes\n\n \n\nAD/SD3-60/25 Shock Absorber Pin Locking Bolt 13/87\n\nApplicability: Model SD3-60 equipped with Dowty Rotol nose gear Type Nos. 200921001 or 200921003.\n\n \n\nRequirement: Action in accordance with Dowty Rotol Service Bulletin 32-29 SD.\n\n \n\nNote 1. CAA AD 009-02-85 refers.\n\n \n\nNote 2. FAA AD 87-17-09 Amdt 39-5713 refers.\n\n \n\nCompliance: Within 100 hrs time in service after 31 December 1987.\n\n \n\nBackground: Reports have been received of the shock absorber lower pin working loose. After investigating one such case, the manufacturer found that the spherical radius of the lock bolt had worn and there could have been insufficient engagement of the lock bolt in the groove of the shock absorber pin.\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, time-bound safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating a particular repair."},"complexity_factors":["Single, specific applicability criterion (two specific gear type numbers)","Single requirement referencing an external technical document (Service Bulletin)","Simple compliance deadline (100 hours time in service after fixed date)","No defined terms section","No cross-references to other legislation sections","Minimal conditional logic (only applicability test)","Short document (approximately 150 words of substantive content)"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). Think of it as a \"recall notice\" for aircraft, but legally binding.\n\n**What it does:** It requires owners and operators of specific Short SD3-60 aeroplanes to inspect and fix a potentially dangerous problem with the nose landing gear.\n\n**The safety problem:** The shock absorber pin (a component that helps the landing gear absorb impact during landing) can work loose because its locking bolt wears down. If this happens, the landing gear could fail.\n\n**Who must act:** Anyone operating a Short SD3-60 aircraft fitted with specific Dowty Rotol nose gear models (Type Nos. 200921001 or 200921003).\n\n**What they must do:** Follow the repair instructions in Dowty Rotol Service Bulletin 32-29 SD.\n\n**When:** Within 100 hours of flying time after 31 December 1987.\n\n**Why it matters:** A loose landing gear pin could cause the nose gear to collapse during landing, potentially causing serious injury or death."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The instrument's scope is confined to the stated SD3-60 model and two specified nose-gear types and mandates the service-bulletin action within the stated time. The text shows no change from that expressed intent or any expansion/reduction of applicability within the instrument itself."},"complexity_factors":["Narrow and specific applicability (only SD3-60 with two Dowty Rotol nose gear types).","Reliance on an external technical document (Dowty Rotol Service Bulletin 32-29 SD) for required action.","Defined but short compliance window (100 flight-hours after a specified date).","Cross-references to other airworthiness directives (CAA AD and FAA AD noted).","Technical maintenance work requiring qualified personnel and possible parts/repair.","Regulatory enforcement by CASA creates mandatory compliance obligations for owners/operators."],"plain_english_summary":"**What it does:** Requires operators of Short SD3-60 aeroplanes fitted with Dowty Rotol nose gear (Type Nos. 200921001 or 200921003) to carry out the work described in Dowty Rotol Service Bulletin 32-29 SD to remedy a worn shock-absorber pin locking bolt (Applicability; Requirement). Compliance is mandatory within 100 flight-hours after 31 December 1987 (Compliance). The cost and action fall on aircraft owners/operators who must inspect/repair per the service bulletin; CASA enforces the AD (Applicability; Requirement; Compliance)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-25-shock-absorber-pin-locking-bolt","history":"/api/acts/ad-sd3-60-25-shock-absorber-pin-locking-bolt/history","analysis":"/api/acts/ad-sd3-60-25-shock-absorber-pin-locking-bolt/analysis","conflicts":"/api/acts/ad-sd3-60-25-shock-absorber-pin-locking-bolt/conflicts","importantCases":"/api/acts/ad-sd3-60-25-shock-absorber-pin-locking-bolt/important-cases","documents":"/api/acts/ad-sd3-60-25-shock-absorber-pin-locking-bolt/documents"}}