{"id":"F2006B09489","name":"AD/EMB-110/49 - Nose Landing Gear Downlock Spring","slug":"ad-emb-110-49-nose-landing-gear-downlock-spring","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54012,"registerId":"commonwealth-F2006B09489-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/49 - Nose Landing Gear Downlock Spring","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)  Embraer EMB-110 (Bandeirante) Series Aeroplanes\n\n \n\nAD/EMB-110/49 Nose Landing Gear Downlock Spring 6/94 DM\n\nApplicability: All Model EMB-110 aircraft, equipped with a NLG downlock part number 14300, 14300-A, 14300-000-01, or 110-9410-02-08.\n\n \n\nRequirement: Action in accordance with Embraer Service Bulletin 110-32-0084.\n\n \n\nNote: CTA AD 94-01-01 Amdt 39-729 refers.\n\n \n\nCompliance: Unless already accomplished, within 25 hours time in service after 27 April 1994.\n\n \n\nBackground: A report was received of the disengagement of both springs from a nose landing gear downlock assembly, which resulted in the down latch assuming a position which prevented the nose landing gear locking down. An investigation revealed that a loss of spring tension had occurred.\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":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope matches its stated purpose: it targets all EMB‑110 aircraft fitted with the listed downlock part numbers to address reported spring disengagement and loss of tension. No broader classes of aircraft, additional parts, or extended obligations are introduced in the text supplied."},"complexity_factors":["Narrow, part‑numbered applicability requires verification of specific downlock part numbers (Applicability).","Mandates actions by reference to an external manufacturer Service Bulletin rather than specifying steps in the AD (Requirement).","Very short compliance window — 25 hours time‑in‑service from a fixed date — increases logistical pressure on operators (Compliance).","Safety‑critical mechanical issue (spring tension/disengagement) necessitates maintenance actions and parts/skill availability (Background).","Administrative enforcement by CASA creates compliance documentation and oversight obligations for operators.","Potential supply or access constraints if affected parts or certified maintenance capacity are limited."],"plain_english_summary":"Requires operators of Embraer EMB‑110 aeroplanes fitted with specified nose landing‑gear downlock part numbers to carry out the work described in Embraer Service Bulletin 110‑32‑0084 (Applicability; Requirement). That work must be completed within 25 hours time‑in‑service after 27 April 1994 (Compliance). CASA issued the AD after a report of both springs disengaging and loss of spring tension that could prevent the nose gear locking down (Background). Operators/owners pay for and arrange the corrective action."},"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 a particular repair."},"complexity_factors":["Single, specific mechanical defect addressed","Only 4 part numbers specified in applicability","Single compliance action (follow one service bulletin)","Simple time-based deadline (25 hours after fixed date)","No nested exceptions, conditional logic, or cross-references to other legislation","Background explanation included in plain language"],"plain_english_summary":"This CASA Airworthiness Directive requires owners/operators of certain Embraer EMB-110 Bandeirante aircraft to inspect and repair the nose landing gear downlock spring (specific downlock assembly part numbers) because springs can pop out and prevent the gear from locking, risking nose-gear collapse.  \n\nWork must follow Embraer Service Bulletin 110-32-0084 and be completed within 25 flight hours after 27 April 1994 (if not already done)."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-49-nose-landing-gear-downlock-spring","history":"/api/acts/ad-emb-110-49-nose-landing-gear-downlock-spring/history","analysis":"/api/acts/ad-emb-110-49-nose-landing-gear-downlock-spring/analysis","conflicts":"/api/acts/ad-emb-110-49-nose-landing-gear-downlock-spring/conflicts","importantCases":"/api/acts/ad-emb-110-49-nose-landing-gear-downlock-spring/important-cases","documents":"/api/acts/ad-emb-110-49-nose-landing-gear-downlock-spring/documents"}}