{"id":"F2006B02426","name":"AD/ANSON/9 - Engine Mount - Inspection","slug":"ad-anson-9-engine-mount-inspection","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41671,"registerId":"commonwealth-F2006B02426-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/ANSON/9 - Engine Mount - 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)  \nAvro Anson and Avro 19 Series Aeroplanes\n\nAD/ANSON/9 Engine Mount \\- Inspection 7/50\n\nApplicability: Anson.\n\nRequirement: Inspect the left and right hand engine mounting support frames in accordance with the following:\n\n    Check for bowing in the open face of the frame between the undercarriage torque tube attachment and the top face of the frame (see Point ‘A’ on Fig. 1 of this AD). The permissible limit of bowing between these points is .125 inch.\n\n    2. Check for bowing between any pair of distance pieces on the open face of the frame (see Point ‘B’ on Fig. 1 of this AD). The permissible limit of bowing between these points is .0625 inch.\n\n    3. Take the following action where limits prescribed in paras. 1 and 2 of this AD are exceeded:\n\n    (a) Remove the existing hollow rivets and distance pieces.\n\n    (b) Press out the bow on the frame flanges.\n\n    (c) Refit new distance pieces of the correct length and replace the hollow rivets by 1/4 in. BSF mild steel bolts.\n\n    (d) Lock the nuts by filing back the bolt and centre popping.\n\n    4. Bowing on the rear face of the frame at the spar attachment is due to the unmachined finish of the frame and can be ignored; or\n\nANO Part 100 Appendix ‘A’ Notice No. 9/1; or ANO 105.1.31.4.6.1.\n\nCompliance: Forthwith.\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.002.png)","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope: a specific safety inspection for a specific aircraft type (Avro Anson). The historical references to earlier notices (ANO Part 100 Appendix 'A' Notice No. 9/1; ANO 105.1.31.4.6.1) indicate this is a reissue or consolidation of existing requirements under the Civil Aviation Regulations 1998 framework, not an expansion of scope."},"complexity_factors":["Very short document (under 300 words)","Only 4 main requirements with clear sequential numbering","Single defined term ('Applicability: Anson') with no interpretation section","No cross-references to other legislation (only historical citation to superseded notices: ANO Part 100 Appendix 'A' Notice No. 9/1; ANO 105.1.31.4.6.1)","Technical but precise language (measurements in inches, specific bolt sizes)","Simple conditional logic: 'If limit exceeded → do steps (a)-(d)'","Single explicit exception (rear face bowing at spar attachment)"],"plain_english_summary":"This directive orders owners and operators of Avro Anson aircraft in Australia to immediately inspect left and right engine-mounting frames for bowing and distortion, with tight bend limits (0.125\" and 0.0625\"). \n\nIf limits are exceeded, mounts must be dismantled, straightened, spacers renewed and fastenings replaced/secured to restore structural integrity. The aim is to prevent in‑flight engine detachment on these ageing aircraft."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No change evident: the directive sticks to the original, narrow remit—inspect left/right engine-mount frames on Anson aircraft, apply specified measurement limits, and carry out defined repair steps with compliance required forthwith."},"complexity_factors":["Clear, narrow applicability (Anson aircraft) reduces scope complexity.","Precise dimensional tolerances (0.125 in and 0.0625 in) require accurate measurement tools and judgment on measurement points.","Remedial work requires structural disassembly and replacement of distance pieces and rivets with specified 1/4 in BSF bolts and locking method, imposing parts and labour needs.","Reference to a figure for inspection points means inspectors must interpret a drawing to locate Points A and B.","Compliance required 'forthwith' increases operational urgency and potential downtime."],"plain_english_summary":"This airworthiness directive requires immediate inspection of left and right engine-mount frames on Avro Anson aircraft for bowing. If bowing exceeds 0.125 in between the torque-tube attachment and top face, or 0.0625 in between distance pieces, maintenance must remove rivets and distance pieces, straighten the flanges, fit new distance pieces, and replace hollow rivets with 1/4 in BSF mild‑steel bolts and locked nuts.\n\nOwners/operators bear inspection, repair and downtime costs; licensed maintenance personnel must perform measurements and repairs. Rear-face bowing at the spar attachment may be ignored."}},"importantCases":[],"_links":{"self":"/api/acts/ad-anson-9-engine-mount-inspection","history":"/api/acts/ad-anson-9-engine-mount-inspection/history","analysis":"/api/acts/ad-anson-9-engine-mount-inspection/analysis","conflicts":"/api/acts/ad-anson-9-engine-mount-inspection/conflicts","importantCases":"/api/acts/ad-anson-9-engine-mount-inspection/important-cases","documents":"/api/acts/ad-anson-9-engine-mount-inspection/documents"}}