{"id":"F2006B08859","name":"AD/DH 104/15 Amdt 2 - Wing Lower Root Joint Fittings P/Nos. 4W 271 and 4W 5013 - Inspection","slug":"ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52058,"registerId":"commonwealth-F2006B08859-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 104/15 Amdt 2 - Wing Lower Root Joint Fittings P/Nos. 4W 271 and 4W 5013 - Inspection","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)  \nDH 104 (Dove) Series Aeroplanes\n\nAD/DH 104/15\n\nAmdt 2\n\nApplicability: All Models.\n\n  \nWing Lower Root Joint Fittings P/Nos.\n\n4W 271 and 4W 5013 \\- Inspection\n\n  \n2/73\n\nRequirement: 1. Inspect Root Joint Fitting Part No. 4W271 or 4W5013 for the presence of chrome plating in the bore of the main attachment bolt hole in accordance with De Havilland TNS CT(104) No. 178 Issue 1 following the procedures set out in that document with the following exception.\n\n    2. Rectification and Re-Assembly.\n\n    (a) When the results of the test prove that chrome plating is present, the fitting must be changed forthwith.\n\n    (b) Replacement of the wing fitting should be carried out to the provisions of Repair Drawing RD 4W131 a copy of which may be obtained from the Service Department, De Havilland Aircraft Co. Ltd., Hatfield, Hertfordshire, England.\n\n    (c) In all cases (whether chrome is found or not) the main attachment bolt should be examined for serviceability, refitted and the joint resealed in accordance with the provisions of TNS CT(104) No. 168 Issue 4.\n\nCompliance: Before 30 March 1973.\n\nNOTE: Where both inspection for and rejection of chromed fittings has been carried out under the previous issue of this Directive, no further action is necessary.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"This is Amendment 2 to AD/DH 104/15. The text modifies practical requirements by specifying the inspection method (TNS CT(104) No.178 Issue 1), spelling out rectification steps including immediate replacement when chrome is found (Requirement 2(a)–(b)), and mandating bolt inspection and joint resealing per TNS CT(104) No.168 Issue 4. It also adds an explicit exception where prior inspection and rejection were completed under the previous issue (NOTE), which alters who must take further action."},"complexity_factors":["Single, specific inspection and pass/fail criterion (Requirement: Inspect for chrome plating in bore of main attachment bolt hole).","Referenced external technical documents and drawings required to complete the work (De Havilland TNS CT(104) No.178 Issue 1; TNS CT(104) No.168 Issue 4; Repair Drawing RD 4W131).","Fixed compliance deadline (Compliance: Before 30 March 1973) creates a scheduling and resource constraint for operators.","Logistics of replacement parts and repair instructions (replacement per RD 4W131; may require contacting manufacturer/service department).","Operator responsibility for inspection, replacement and resealing of the joint (Requirement 2(a)–(c)), implying direct cost and labour burden.","One-line exception for prior compliance (NOTE: prior inspection/rejection under previous issue negates further action) introduces limited record-checking complexity."],"plain_english_summary":"This Airworthiness Directive requires operators of De Havilland DH 104 (Dove) series aeroplanes to inspect wing lower root joint fittings P/N 4W271 or 4W5013 for chrome plating in the bore of the main attachment bolt hole, replace any chromed fitting and re‑seal and check the bolt. Compliance is required before 30 March 1973. It therefore directly affects aircraft owners/operators who must carry out the inspection, obtain replacements or repairs (RD 4W131) and follow De Havilland technical notes (TNS CT(104) Nos. 178 and 168)."},"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 2 of an existing Airworthiness Directive. The scope remains tightly focused on the original safety issue (chrome plating in wing root fittings). The amendment appears to add a note clarifying that previous compliance under earlier issues satisfies the requirement — this is a standard administrative clarification, not a scope expansion."},"complexity_factors":["Short, single-purpose directive focused on one specific inspection task","Only 2 defined part numbers (4W 271 and 4W 5013) and 2 technical document references","Simple conditional logic: 'if chrome found → replace; if not found → still check bolt and reseal'","No nested exceptions or complex cross-referencing to other legislation","Clear, sequential numbering (1, 2, 2a, 2b, 2c) with straightforward compliance requirement","Single applicability statement ('All Models') with no exclusions or sub-categories"],"plain_english_summary":"This AD orders owners/operators/maintainers of De Havilland DH 104 \"Dove\" aircraft in Australia to inspect the wing lower root joint fitting (parts 4W 271/4W 5013) for chrome plating in the bolt hole, replacing any contaminated fitting and resealing/reinstalling the bolt per De Havilland procedures.  \n\nIt’s a life‑critical safety requirement to prevent hydrogen‑embrittlement cracking and possible wing separation; the (historical) compliance deadline was 30 March 1973."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection","history":"/api/acts/ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection/history","analysis":"/api/acts/ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection/analysis","conflicts":"/api/acts/ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection/conflicts","importantCases":"/api/acts/ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection/important-cases","documents":"/api/acts/ad-dh-104-15-amdt-2-wing-lower-root-joint-fittings-p-nos-4w-271-and-4w-5013-inspection/documents"}}