{"id":"F2006B07498","name":"AD/TSA-600/34 - Hydraulic System Internal Leak Check","slug":"ad-tsa-600-34-hydraulic-system-internal-leak-check","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":49965,"registerId":"commonwealth-F2006B07498-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/TSA-600/34 - Hydraulic System Internal Leak Check","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)  \nAerostar (Piper/Ted Smith) 600 and 700 Series Aeroplanes\n\nAD/TSA-600/34 Hydraulic System Internal Leak Check 11/85\n\nApplicability: All models not fitted with an auxiliary hydraulic pump system.\n\nRequirement: With the aircraft on jacks, ensure that with the undercarriage fully retracted, the flap selector lever in neutral and the hydraulic pressure selected off, the landing gear remains in the fully retracted position for a minimum period of 30 minutes.\n\nCompliance: Prior to the issue of the next Maintenance Release after 31 December 1985 and thereafter at each issue of a new Maintenance Release.\n\nBackground: In the event of a R/H engine failure in flight, the landing gear may automatically extend to the locked down position if an internal leak was present in the hydraulic system.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1741},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The directive maintains its original narrow scope as issued in 1985, addressing only the specific hydraulic leak check for the stated aircraft models to prevent inadvertent landing gear extension. No evidence of scope creep or expansion beyond this original airworthiness safety purpose."},"complexity_factors":["Single, discrete technical requirement with unambiguous procedural steps","Narrow applicability limited to specific aircraft models lacking auxiliary hydraulic pumps","No nested exceptions, conditional logic, or cross-references to other legislative instruments","Straightforward compliance structure: one-time initial deadline plus recurring requirement tied to Maintenance Release cycle","Minimal defined terms—uses standard aviation terminology (jacks, undercarriage, Maintenance Release)"],"plain_english_summary":"Owners/operators of Aerostar (Piper/Ted Smith) 600 and 700 series aircraft without an auxiliary hydraulic pump must perform a safety check to ensure the landing gear won’t unexpectedly fall down in flight. The check involves jacking the airplane, retracting the gear with hydraulics off and flaps neutral, and confirming it stays retracted for 30 minutes.\n\nDo the test before the next Maintenance Release after 31 Dec 1985 and each time a new Maintenance Release is issued. This prevents gear extension from a hydraulic leak that could create drag during single‑engine flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-tsa-600-34-hydraulic-system-internal-leak-check","history":"/api/acts/ad-tsa-600-34-hydraulic-system-internal-leak-check/history","analysis":"/api/acts/ad-tsa-600-34-hydraulic-system-internal-leak-check/analysis","conflicts":"/api/acts/ad-tsa-600-34-hydraulic-system-internal-leak-check/conflicts","importantCases":"/api/acts/ad-tsa-600-34-hydraulic-system-internal-leak-check/important-cases","documents":"/api/acts/ad-tsa-600-34-hydraulic-system-internal-leak-check/documents"}}