{"id":"F2006B09002","name":"AD/DHC-1/19 Amdt 1 - Flap Layshaft and Operating Cam","slug":"ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52650,"registerId":"commonwealth-F2006B09002-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/19 Amdt 1 - Flap Layshaft and Operating Cam","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-1/19\n\nAmdt 1\n\n  \nFlap Layshaft and Operating Cam 8/97\n\nApplicability: Model C1 Chipmunk (English production) aircraft.\n\nRequirement: Inspect in accordance with British Aerospace Technical News Sheet (TNS) No.170 Issue 2.\n\nNote: TNS 170 superseded TNS 155.\n\nCompliance: At the next Check 4 inspection after 17 July 1997; and thereafter at each subsequent Check 4 inspection.\n\nThis amendment becomes effective on 17 July 1997.\n\nBackground: Reports were received of cracking or fracture of the brazing joint of the arm and associated tube, which together form the flap operating rod. Cracking of the operating cam has also been reported.\n\nAmendment 1 is issued to include the current issue of the applicable Technical News Sheet.\n\nThe original issue of this airworthiness directive became effective on 17 March 1969.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1251},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The amendment maintains the original scope. It merely updates the referenced technical document to the current issue (TNS 170 Issue 2) without expanding the types of aircraft affected, the components to be inspected, or the inspection frequency."},"complexity_factors":["Single operational requirement with clear external technical reference (British Aerospace TNS No.170 Issue 2)","Specific but narrow applicability (only Model C1 Chipmunk English production)","Standard aviation maintenance schedule reference (Check 4 inspection)","Brief amendment history (references original 1969 issue and superseded TNS 155)"],"plain_english_summary":"Owners and operators of vintage De Havilland DHC‑1 Chipmunk (Model C1) must inspect the flap layshaft and operating cam for cracks per British Aerospace Technical News Sheet No.170 at the next \"Check 4\" after 17 July 1997 and at every subsequent Check 4. This mandatory AD responds to cracked/broken flap components that could cause flap failure and endanger flight safety; Amendment 1 updates the technical‑manual reference."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam","history":"/api/acts/ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam/history","analysis":"/api/acts/ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam/analysis","conflicts":"/api/acts/ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam/conflicts","importantCases":"/api/acts/ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam/important-cases","documents":"/api/acts/ad-dhc-1-19-amdt-1-flap-layshaft-and-operating-cam/documents"}}