{"id":"F2006B08895","name":"AD/DH 82/1 - Undercarriage Strut - Modification","slug":"ad-dh-82-1-undercarriage-strut-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":52398,"registerId":"commonwealth-F2006B08895-current","compilationNumber":null,"startDate":"2026-04-02","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/DH 82/1 - Undercarriage Strut - Modification","content":"![](image.001.png)  \nDH 82 (Tiger Moth) Series Aeroplanes\n\nAD/DH 82/1 Undercarriage Strut \\- Modification NK\n\nApplicability: All models.\n\nRequirement: 1. Replace the lower fork end fitting P/N 45491 and DHA 2185 with a steel fitting in accordance with Figure 3 of this Directive, or with steel fitting P/N DHA 2195 obtainable from De Havilland Aircraft Pty. Ltd., Bankstown, New South Wales.\n\n    2. Modify the lower fork bolt P/N H24060 in accordance with Figure 4 of this Directive.\n\n    3. Attach this fitting to the centre tube with 3/16 in. diameter rivets of BSS S2 material in accordance with Figure 1 of this Directive.\n\n    4. Replace the rivets attaching the upper retaining sleeve P/N 62814 with rivets of BSS S2 material.\n\n    5. To prevent the moving portion of the landing gear from becoming disengaged from the fixed portion in the event of failure of the rivets attaching the retaining sleeve to the centre tube, install a check cable in accordance with Figure 2 of this Directive; or\n\n6. ANO 105.1.14.5.5.1.\n\nCompliance: Forthwith.\n\nFigure 1.\n\n![](image.002.png)  \n\nFigure 2.\n\n![](image.003.png)\n\nFigure 3.\n\n![](image.004.png)\n\nFigure 4.\n\n![](image.005.png)","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2103},"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This airworthiness directive maintains its original narrow scope as a targeted safety mandate addressing a specific mechanical defect in the undercarriage strut assembly of DH 82 Tiger Moth aircraft. It has not expanded beyond its initial safety purpose."},"complexity_factors":["Technical aviation terminology and precise part numbering (e.g., P/N 45491, DHA 2195, H24060)","Reference to external engineering drawings and figures (Figures 1-4) not fully reproduced in the text","Alternative compliance pathway referencing separate aviation regulation (ANO 105.1.14.5.5.1)","Specific material specifications (BSS S2 rivets) requiring technical engineering knowledge to identify"],"plain_english_summary":"This mandatory safety order requires owners/operators of DH 82 Tiger Moth aircraft to take immediate action to prevent undercarriage collapse: replace the lower fork end fitting with a specified stronger steel part, modify the lower fork bolt per drawings, use 3/16\" BSS S2 rivets (including replacing upper retaining sleeve rivets), and fit a safety cable as a backup. \n\nAffected: pilots, owners, and maintenance engineers. Work must be done forthwith (before the next flight) or by complying with ANO 105.1.14.5.5.1."}},"importantCases":[],"_links":{"self":"/api/acts/ad-dh-82-1-undercarriage-strut-modification","history":"/api/acts/ad-dh-82-1-undercarriage-strut-modification/history","analysis":"/api/acts/ad-dh-82-1-undercarriage-strut-modification/analysis","conflicts":"/api/acts/ad-dh-82-1-undercarriage-strut-modification/conflicts","importantCases":"/api/acts/ad-dh-82-1-undercarriage-strut-modification/important-cases","documents":"/api/acts/ad-dh-82-1-undercarriage-strut-modification/documents"}}