{"id":"F2006B09004","name":"AD/DHC-1/21 Amdt 1 - Wing to Fuselage Attachment Links","slug":"ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52656,"registerId":"commonwealth-F2006B09004-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DHC-1/21 Amdt 1 - Wing to Fuselage Attachment Links","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)  De Havilland DHC-1 (Chipmunk) Series Aeroplanes\n\n \n\nAD/DHC-1/21\n\nAmdt 1\n\n\nWing to Fuselage Attachment Links 10/85\n\n \n\nApplicability: All English production models.\n\n \n\nRequirement: Action in accordance with British Aerospace T.N.S. No. 161, Issue 3.\n\n \n\nCompliance: Within 100 hours time in service after 31 October 1985 or at the next scheduled inspection for Maintenance Release issued after 31 October 1985, whichever is the later and at any time the wing attachment links are removed.\n\n \n\nBackground: Cases have been reported where the wing to fuselage attachment links have been fitted out of alignment resulting in chafing of the spar and/or tie bar, by the links. This Directive is revised to reflect Issue 3 of the Requirement Document which revises the shimming procedure.\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":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":1744},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This amendment updates the technical reference to Issue 3 of the British Aerospace standard to reflect a revised shimming procedure, but maintains the same safety scope regarding wing attachment link alignment on the specified aircraft."},"complexity_factors":["Single operative requirement referencing external technical document (British Aerospace T.N.S. No. 161, Issue 3)","Dual compliance triggers (time-based deadline and condition-based 'when removed' requirement)","Narrow applicability limited to English production models only"],"plain_english_summary":"This directive requires owners/operators of English-built De Havilland DHC-1 Chipmunk aircraft to inspect and, if needed, correct the alignment of the metal links attaching wing to fuselage, using British Aerospace T.N.S. No. 161 Issue 3 shimming procedures. Misaligned links can chafe spars or tie bars, risking structural weakening and failure. Compliance is within 100 flight hours after 31 Oct 1985 or at the next inspection (whichever is later), and whenever the attachment links are removed."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links","history":"/api/acts/ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links/history","analysis":"/api/acts/ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links/analysis","conflicts":"/api/acts/ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links/conflicts","importantCases":"/api/acts/ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links/important-cases","documents":"/api/acts/ad-dhc-1-21-amdt-1-wing-to-fuselage-attachment-links/documents"}}