{"id":"F2006B08325","name":"AD/CESSNA 400/39 Amdt 3 - Lower Wing Skin Rivets","slug":"ad-cessna-400-39-amdt-3-lower-wing-skin-rivets","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"repealed","isInForce":false,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":115732,"registerId":"commonwealth-F2006B08325-current","compilationNumber":null,"startDate":"2026-04-03","status":"Repealed","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/CESSNA 400/39 Amdt 3 - Lower Wing Skin Rivets","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)  \nCessna 400 Series Aeroplanes\n\nAD/CESSNA 400/39\n\nAmdt 3\n\n  \nLower Wing Skin Rivets 10/91\n\nApplicability: All model 402B with S/Nos 402B0361 to 402B1212. All model 414 with S/Nos 414- 0391 to 414-0912 and all model 421 with S/Nos 421B-0397 to 421B-0970.\n\nRequirement: Action in accordance with Cessna SL ME77-6.\n\nCompliance: At each inspection for Maintenance Release issue after 3 October 1991. The compliance date of the previous issue of this Directive was 1 January 1978.\n\nBackground: This Directive was raised in response to Cessna SL ME77-6, which introduced repair instructions for use in the event of loose or working lower wing skin/front spar attach rivets. This amendment is raised to ensure ongoing inspection; due to the difficulty in identifying replaced rivets, and likely deterioration of bonding.","sortOrder":0}],"analysis":{"kimi_summary":{"_metrics":{"model":"kimi-k2.5","source":"moonshot-batch","completionTokens":2715},"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"The amendment maintains focus on the original safety issue of loose lower wing skin rivets for the same aircraft models. While it changes the compliance from a one-time requirement to a recurring inspection schedule, this does not represent scope creep beyond the original safety purpose."},"complexity_factors":["Single external technical reference (Cessna Service Letter ME77-6)","Limited applicability: only three specific aircraft models with defined serial number ranges","No defined terms, nested exceptions, or conditional logic","Simple recurring compliance obligation (inspect at each Maintenance Release)"],"plain_english_summary":"This AD mandates that owners/operators of certain Cessna 402B, 414, and 421 serial-numbered aircraft inspect lower wing-skin rivets at the front spar at every Maintenance Release, using the procedures in Cessna Service Letter ME77-6.  \n\nIt moves inspections from one-time to recurring because replaced rivets are not reliably identifiable and bonding adhesive degrades; catching loose or “working” rivets during routine maintenance prevents potential wing structural failure. Compliance applies to every Maintenance Release after 3 October 1991."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-400-39-amdt-3-lower-wing-skin-rivets","history":"/api/acts/ad-cessna-400-39-amdt-3-lower-wing-skin-rivets/history","analysis":"/api/acts/ad-cessna-400-39-amdt-3-lower-wing-skin-rivets/analysis","conflicts":"/api/acts/ad-cessna-400-39-amdt-3-lower-wing-skin-rivets/conflicts","importantCases":"/api/acts/ad-cessna-400-39-amdt-3-lower-wing-skin-rivets/important-cases","documents":"/api/acts/ad-cessna-400-39-amdt-3-lower-wing-skin-rivets/documents"}}