{"id":"F2006B09015","name":"AD/DHC-1/34 Amdt 1 - Shock Absorber Strut Piston Tube","slug":"ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52682,"registerId":"commonwealth-F2006B09015-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/34 Amdt 1 - Shock Absorber Strut Piston Tube","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nDe Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\nAD/DHC-1/34\n\nAmdt 1\n\n  \nShock Absorber Strut Piston Tube 5/96\n\nApplicability: Model C1 Chipmunk (English production) aircraft.\n\nRequirement: Action in accordance with British Aerospace Mandatory Technical News Sheet No.\n\n194.\n\nNote 1: TNS 194 provides details of BAe field support with regard to sample collection or chemical analysis services etc. to comply with the requirements of this Directive. Local NATA testing laboratories are also able to carry out the chemical analysis requirement. A copy of BS T60 is available on request to the Authority through a District Airworthiness Office.\n\nNote 2: UK CAA AD 004-02-95 refers.\n\nCompliance: Unless already accomplished, as specified in the Requirement Document with a revised compliance date of 25 April 1997.\n\nBackground: A case has been found of an unapproved main undercarriage piston tube of unknown origin being fitted to an aircraft. The item was of incorrect material and gauge.\n\nAmendment 1 is issued in response to a new UK CAA AD which requires certain actions because cases have been found of undercarriage piston tubes being manufactured from material of incorrect specification. Piston tubes have also been found to have suffered from corrosion, both internally and externally.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2729},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"Amendment 1 updates requirements and compliance dates based on new UK CAA safety information, but remains focused on the original scope of ensuring piston tube material integrity and condition on the specified Chipmunk aircraft."},"complexity_factors":["Single external reference document (British Aerospace TNS 194)","No defined terms or interpretation section","Single applicability criterion (one specific aircraft model)","One primary compliance action required","Short document with minimal conditional language"],"plain_english_summary":"This directive requires owners of De Havilland Chipmunk Model C1 (English production) to inspect the main landing gear shock absorber strut piston tubes because wrong materials, incorrect thickness, or corrosion could cause gear failure on landing.  \n\nInspections must follow British Aerospace Mandatory Technical News Sheet No. 194; chemical analysis may be done by NATA‑accredited labs or through British Aerospace field support, and actions must be completed by the compliance deadline."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube","history":"/api/acts/ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube/history","analysis":"/api/acts/ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube/analysis","conflicts":"/api/acts/ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube/conflicts","importantCases":"/api/acts/ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube/important-cases","documents":"/api/acts/ad-dhc-1-34-amdt-1-shock-absorber-strut-piston-tube/documents"}}