{"id":"F2008L01216","name":"AD/CESSNA 170/82 - Seat Base/Back Attach Bracket","slug":"ad-cessna-170-82-seat-base-back-attach-bracket","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":73455,"registerId":"commonwealth-F2008L01216-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 170, 172, F172, FR172 and 175 Ser","sectionType":"division","heading":"Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes","content":"### Cessna 170, 172, F172, FR172 and 175 Series Aeroplanes\n\n| AD/CESSNA 170/82 | Seat Base/Back Attach Bracket | 5/2008 |\n| ---------------- | ----------------------------- | ------ |\n\n| Applicability: | Cessna Model 172R, S/N 17281211 through 17281356, and Model 172S,S/N 172S9621 through 172S10310, 172S10312 through 172S10324, 172S10327 through 172S10332, 172S10334 through 172S10349, 172S10351 through 172S10374, 172S10376 through 172S10386, 172S10388 through 172S10408, 172S10410 through 172S10412, 172S10414 through 172S10417, and 172S10421 through 172S10423. |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Follow Cessna Aircraft Company Single Engine Modification Kit No. MK206-25-10, dated 23 April 2007 or later approved revision, as specified in Cessna Aircraft Company Service Bulletin SB07-25-04, dated 23 April 2007 or later approved revision.Note: FAA AD 2008-05-09 refers.                                                                                        |\n| Compliance:    | Within the next 50 hours time-in-service after or within the next 6 months, after the effective date of this Airworthiness Directive, whichever occurs first.                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 8 May 2008.                                                                                                                                                                                                                                                                                                             |\n| Background:    | This AD results from reports of the seat base/back attach bracket failing where it is welded to the seat base. We are issuing this Airworthiness Directive to prevent failure of the seat base/back attach brackets, which could result in the seats collapsing backwards during flight with consequent loss of control.                                                  |\n\n![](image.001.png)  \nJames Coyne  \nDelegate of the Civil Aviation Safety Authority\n\n27 March 2008","sortOrder":0},{"sectionNumber":"AD/CESSNA 170/82","sectionType":"part","heading":"AD/CESSNA 170/82","content":"## AD/CESSNA 170/82","sortOrder":1},{"sectionNumber":"Seat Base/Back Attach Bracket","sectionType":"part","heading":"Seat Base/Back Attach Bracket","content":"## Seat Base/Back Attach Bracket","sortOrder":2},{"sectionNumber":"5/2008","sectionType":"part","heading":"5/2008","content":"## 5/2008","sortOrder":3}],"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 AD maintains its original narrow scope — addressing a specific mechanical defect in specific Cessna aircraft serial numbers. There is no evidence of scope creep; it targets exactly the safety issue identified (seat bracket weld failures) in exactly the aircraft models affected."},"complexity_factors":["Very short document (under 300 words)","Only 2 defined applicability criteria (specific aircraft models and serial numbers)","Single requirement referencing external technical documents (Cessna Service Bulletin)","Simple compliance deadline structure (50 hours OR 6 months, whichever first)","No nested exceptions, conditional logic, or cross-references to other legislation","Straightforward cause-and-effect background explanation"],"plain_english_summary":"CASA has issued a mandatory Airworthiness Directive requiring owners/operators of specified Cessna 172R and 172S serial numbers to inspect and modify the seat base/seat-back attach brackets.\n\nThe required modification follows Cessna MK206-25-10/SB07-25-04 and must be done within 50 flight hours or 6 months to prevent bracket weld cracks that can let seats collapse and risk pilot loss of control."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive applies only to the listed Cessna 172R and 172S serial numbers and prescribes a single corrective action (install MK206-25-10 per SB07-25-04). The instrument does not indicate any expansion beyond those aircraft or any change from an earlier broader scope within the text supplied."},"complexity_factors":["Narrow, serial-numbered applicability across many contiguous and non-contiguous ranges — operators must check individual airframe S/Ns to determine applicability (Applicability).","Mandated technical fix requires use of a specific manufacturer modification kit and service bulletin, which creates a dependency on parts, technical documentation and approved revisions (Requirement: MK206-25-10; SB07-25-04).","Compliance deadline of 50 flight hours or 6 months forces scheduling and potential short-notice maintenance downtime (Compliance).","Reference to “later approved revision” of the kit/SB introduces administrative discretion about which revisions are acceptable and who approves them (Requirement).","Cross-reference to FAA AD 2008-05-09 may require operators to consult external regulatory material for full compliance context (Requirement note).","Safety-critical nature of the defect (seat bracket weld failure) raises urgency but also requires competent installation and post-modification verification (Background).","Effective date and formalisation by CASA delegate impose a legal compliance trigger and possible grounding if unaddressed (Effective date; Compliance)."],"plain_english_summary":"Mandates installation of Cessna modification kit MK206-25-10 (per Service Bulletin SB07-25-04) on specified Cessna 172R and 172S serial numbers to address weld failures on the seat base/back attach bracket. Aircraft owners/operators must carry out the kit installation within 50 flight hours or six months of the directive (effective 8 May 2008) to avoid possible seat collapse in flight."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-170-82-seat-base-back-attach-bracket","history":"/api/acts/ad-cessna-170-82-seat-base-back-attach-bracket/history","analysis":"/api/acts/ad-cessna-170-82-seat-base-back-attach-bracket/analysis","conflicts":"/api/acts/ad-cessna-170-82-seat-base-back-attach-bracket/conflicts","importantCases":"/api/acts/ad-cessna-170-82-seat-base-back-attach-bracket/important-cases","documents":"/api/acts/ad-cessna-170-82-seat-base-back-attach-bracket/documents"}}