{"id":"F2006B04873","name":"AD/CASA/17 - MLG Shock Absorber","slug":"ad-casa-17-mlg-shock-absorber","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44680,"registerId":"commonwealth-F2006B04873-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CASA/17 - MLG Shock Absorber","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)  Casa 212 Series Aeroplanes\n\n \n\nAD/CASA/17 MLG Shock Absorber 3/95\n\nApplicability: All Model C-212 aircraft.\n\n \n\nRequirement: Action in accordance with the technical requirements of Spanish DGAC AD 07/94.\n\n \n\nNote: CASA SB 212-32-38 refers.\n\n \n\nCompliance: As specified in the Requirement Document with a revised effective date of 2 March 1995.\n\n \n\nBackground: The DGAC requires the incorporation of a modification which improves the attachment of the restrictor piston on the sliding tube in the MLG shock absorbers, by increasing from one to three the number of screw pins installed.\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 standard, narrow airworthiness directive focused on a specific mechanical modification to a specific aircraft type. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly used (MLG = Main Landing Gear)","No nested conditional logic or exceptions","Single cross-reference to external document (Spanish DGAC AD 07/94)","Single cross-reference to CASA Service Bulletin 212-32-38","Straightforward applicability (all Model C-212 aircraft, no exceptions)","Clear, single requirement with no alternative compliance methods described"],"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 all **CASA 212 series aircraft** (a type of twin-turboprop plane) to carry out a specific safety modification to the **main landing gear (MLG) shock absorbers**.\n\n**The specific fix:** The directive mandates installing a modification that improves how a \"restrictor piston\" attaches to the sliding tube inside the shock absorbers. Instead of using just one screw pin to hold this part in place, three screw pins must now be used. This makes the landing gear more reliable and less likely to fail.\n\n**Who must comply:** Anyone who owns or operates a Model C-212 aircraft in Australia.\n\n**How to comply:** Operators must follow the technical instructions in **Spanish DGAC AD 07/94** (the original safety notice from Spain's aviation authority, since the CASA 212 is a Spanish-designed aircraft). CASA also references their own **Service Bulletin 212-32-38** for additional guidance.\n\n**When:** The work had to be done by the deadlines specified in the Spanish directive, with this Australian directive taking effect on **2 March 1995**.\n\n**Why it matters:** Landing gear failures can be catastrophic. This directive prevents potential accidents by ensuring the shock absorber assembly is more robustly constructed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The text indicates a revised effective date for compliance (2 March 1995) but does not change the substantive scope of the requirement. The directive continues to require incorporation of the modification described by Spanish DGAC AD 07/94 for all Model C-212 aircraft, with technical detail and procedural steps to be followed as set out in the referenced Requirement Document and service bulletin. (Compliance, Requirement, Applicability, Background)"},"complexity_factors":["Cross-reference to a foreign regulator’s detailed technical AD (Spanish DGAC AD 07/94) rather than including full technical steps in the text (Requirement)","Reference to a CASA service bulletin (SB 212-32-38) and an external Requirement Document for compliance details (Note, Requirement, Compliance)","Technical nature of the mandated change (mechanical modification to MLG shock absorber—increasing screw pins from one to three) requiring maintenance capability (Background)","Applicability to all Model C-212 aircraft (broad scope of affected fleet) (Applicability)","A revised effective date is specified but the directive does not include cost, timing, parts lists, or alternative compliance procedures (Compliance)"],"plain_english_summary":"The directive requires a physical modification to the main landing gear shock absorber on CASA Model C-212 aircraft: the restrictor piston attachment must be changed from one screw pin to three. It is imposed on all owners/operators of affected C-212s.\n\nCompliance must follow the Spanish DGAC AD 07/94 and CASA Service Bulletin SB 212-32-38 (Requirement Document), effective 2 March 1995. The change is intended to improve attachment security; operators must arrange and fund the work."}},"importantCases":[],"_links":{"self":"/api/acts/ad-casa-17-mlg-shock-absorber","history":"/api/acts/ad-casa-17-mlg-shock-absorber/history","analysis":"/api/acts/ad-casa-17-mlg-shock-absorber/analysis","conflicts":"/api/acts/ad-casa-17-mlg-shock-absorber/conflicts","importantCases":"/api/acts/ad-casa-17-mlg-shock-absorber/important-cases","documents":"/api/acts/ad-casa-17-mlg-shock-absorber/documents"}}