{"id":"F2007L00642","name":"AD/CESSNA 180/89 - Crew Seat Back Cylinder Lock Modification","slug":"ad-cessna-180-89-crew-seat-back-cylinder-lock-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":64124,"registerId":"commonwealth-F2007L00642-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Cessna 180, 182 and Wren 460 Series Aero","sectionType":"division","heading":"Cessna 180, 182 and Wren 460 Series Aeroplanes","content":"### Cessna 180, 182 and Wren 460 Series Aeroplanes\n\n| AD/CESSNA 180/89 | Crew Seat Back Cylinder Lock Modification | 5/2007 DM |\n| ---------------- | ----------------------------------------- | --------- |\n\n| Applicability: | Cessna 182S (Serial Numbers 18280001 through 18280944), Cessna 182T (Serial Numbers 18280945 through 18281701) and Cessna T182T (Serial Numbers T18208001 through T18208453). |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement: | 1) Aeroplanes that do not have Modification Kit MK172-25-10A or Modification Kit MK172-25-10B installed, for each crew seat (pilot and copilot), install Modification Kit MK172-25-10C or fabricate and install a steel lock rod/bar. Follow Cessna Single Engine Service Bulletin SB04-25-01, Revision 4, dated December 26, 2006, for installing Modification Kit MK172-25-l0C, or, follow Cessna Single Engine Service Bulletin SB04-25-02, Revision 1, dated October 17, 2005, or Revision 2, dated June 5, 2006, for fabricating and installing a steel lock rod/bar.2) Aeroplanes that have Modification Kit MK172-25-10A or Modification Kit MK172-25-10B installed:(i) For each crew seat (pilot and co-pilot), perform an installation inspection in accordance with Cessna Single Engine Service Bulletin SB04-25-01, Revision 4, dated 26 December 2006.(ii) If you do not find any discrepancies during the inspection required in paragraph (2)(i) of this AD, make a log book entry showing compliance with this AD and no further action is required.(iii) If you find discrepancies during the inspection required in paragraph (2)(i) of this AD, make all necessary corrective actions in accordance with Cessna Single Engine Service Bulletin SB04-25-01, Revision 4, dated 26 December 2006.Note: FAA AD 2007-05-10 Amdt 39-14971 and Cessna Service Bulletins SB04-25-01 and SB04-25-02 refer. |\n| Compliance: | 1) For aeroplanes over 1,000 hours time-in-service (TIS) on the effective date of this AD, perform the action within the next 4 months after the effective date of this AD; orFor aeroplanes from 501 to 1,000 hours TIS on the effective date of this AD, perform the action within the next 8 months after the effective date of this AD; or |\n| | For aeroplanes from 0 to 500 hours TIS on the effective date of this AD, perform the action within the next 12 months after the effective date of this AD.2) For aeroplanes meeting Requirement 2:(i) Within the next 30 days after the effective date of this AD.(ii) Before further flight after the inspection required in paragraph 2(i) of this AD.(iii) Before further flight after the inspection required in paragraph 2(i) of this AD. |\n| | This Airworthiness Directive becomes effective on 11 April 2007. |\n| Background: | This AD results from reports of the crew seat back cylinder lock assembly failing at the aft end area and other cylinder lock assemblies found cracked. The actions specified in this AD are intended to prevent the crew seat cylinder lock assembly from bending, cracking, or failing. This failure could cause uncontrolled movement of the seat back, resulting in possible backward collapse during flight. Backward collapse of either crew seat back could result in an abrupt pitch-up if the affected crew member continues to hold on to the control yoke during this failure and could cause difficulty in exiting the airplane from an aft passenger seat after landing. |\n\n![](image.001.png) \nDavid Villiers \nDelegate of the Civil Aviation Safety Authority\n\n9 March 2007","sortOrder":0},{"sectionNumber":"AD/CESSNA 180/89","sectionType":"part","heading":"AD/CESSNA 180/89","content":"## AD/CESSNA 180/89","sortOrder":1},{"sectionNumber":"Crew Seat Back Cylinder Lock Modificatio","sectionType":"part","heading":"Crew Seat Back Cylinder Lock Modification","content":"## Crew Seat Back Cylinder Lock Modification","sortOrder":2},{"sectionNumber":"5/2007 DM","sectionType":"part","heading":"5/2007 DM","content":"## 5/2007 DM","sortOrder":3}],"analysis":{"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":4,"scope_assessment":{"changed":false,"description":"This AD appears to be a focused safety directive addressing a specific mechanical defect in seat back cylinder locks. The scope remains tightly constrained to the identified safety issue and specified aircraft models. There is no evidence of scope creep beyond the original airworthiness concern."},"complexity_factors":["Multiple conditional pathways based on existing modification kit status (two main requirement branches)","Cross-references to external Cessna Service Bulletins (SB04-25-01 Rev 4, SB04-25-02 Rev 1 and Rev 2) and FAA AD 2007-05-10","Tiered compliance deadlines based on time-in-service (TIS) hours (three separate brackets)","Nested sub-requirements for Path 2 (inspection → conditional outcomes → corrective actions)","Specific serial number applicability ranges requiring careful verification","Three different modification kit part numbers to distinguish between (MK172-25-10A, MK172-25-10B, MK172-25-10C)"],"plain_english_summary":"This CASA Airworthiness Directive mandates owners/operators of specified Cessna 182S/182T/T182T aircraft to eliminate a failure risk in the pilot and co‑pilot seat back cylinder lock assembly, which can crack and allow sudden seat collapse. Compliance requires either installing an approved kit or fabricating a steel lock (or inspecting/fixing existing earlier kits), within timeframes tied to total flight hours. It’s a mandatory safety corrective action to prevent in‑flight control disruption and post‑landing entrapment."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD remains narrowly focused on one safety issue: preventing failure of the crew seat back cylinder lock assembly on a defined set of Cessna 182/T182 serial numbers. It prescribes remedial action (install kit or fabricate rod) or inspection/correction for earlier kits and sets staged compliance deadlines. There is no indication in the text that the instrument expanded beyond that original safety purpose or added unrelated obligations."},"complexity_factors":["Narrow applicability by exact serial‑number ranges (3 model/serial ranges)","Two parallel compliance paths: install MK172‑25‑10C kit OR fabricate/install steel lock rod/bar per SB04‑25‑02","Separate path for aircraft with earlier kits MK172‑25‑10A/B requiring inspection and possible corrective action","Multiple referenced documents with specific revisions (Cessna SB04‑25‑01 Rev 4; SB04‑25‑02 Rev 1 or 2; FAA AD 2007‑05‑10)","Staged compliance schedule tied to aircraft time‑in‑service (three TIS bands with different deadlines)","Log‑book entry requirement and ‘before further flight’ condition for corrective actions","Relatively short document with limited nested exceptions (inspection → either 'no discrepancies' or 'discrepancies found' branches)"],"plain_english_summary":"**What this instrument changes (mechanically)\n\n- Requires certain Cessna 182 and T182 aeroplanes (specific serial-number ranges listed below) to either: \n - install Modification Kit MK172-25-10C on each crew seat (pilot and co‑pilot), following Cessna Single Engine Service Bulletin SB04-25-01 Revision 4 (26 Dec 2006); or \n - fabricate and install a steel lock rod/bar for each crew seat, following Cessna Single Engine Service Bulletin SB04-25-02 (Revision 1 or 2). \n- If an aeroplane already has Modification Kit MK172-25-10A or MK172-25-10B installed, the owner/operator must inspect that installation per SB04-25-01 Revision 4: \n - if no discrepancies are found, record a log‑book entry showing compliance and do nothing more; \n - if discrepancies are found, carry out corrective actions per SB04-25-01 Revision 4. \n\n**Which aeroplanes are affected**\n\n- Cessna 182S: serial numbers 18280001 through 18280944 \n- Cessna 182T: serial numbers 18280945 through 18281701 \n- Cessna T182T: serial numbers T18208001 through T18208453\n\n(Only those specific serial numbers are in scope.)\n\n**When it must be done (compliance times)**\n\n- For aeroplanes with more than 1,000 hours time‑in‑service (TIS) on the effective date: within 4 months. \n- For 501–1,000 hours TIS: within 8 months. \n- For 0–500 hours TIS: within 12 months. \n- For aeroplanes that already have MK172‑25‑10A or MK172‑25‑10B installed: inspection must be done within 30 days of the effective date and any corrective action must be completed before further flight. \n- A log‑book entry is required to show compliance when no discrepancies are found.\n\n**Why the regulator says this is required (stated purpose)**\n\n- The AD follows reports that the crew seat back cylinder lock assembly was failing (bending, cracking or fracturing) at the aft end area. \n- The stated intention is to prevent seat back cylinder lock failure because such failure could allow uncontrolled rearward movement (backward collapse) of a crew seat. That failure could cause an abrupt pitch‑up if a crew member holds the control yoke during the event and could make it harder for occupants in aft seats to exit after landing.\n\n**Who pays and who decides**\n\n- Aircraft owners/operators must pay for parts, fabrication (if chosen), labour and downtime to install the kit or fabricate and fit the steel rod/bar, or to perform the inspection and any corrective work required. \n- Maintenance organisations or suitably authorised mechanics perform the installation/inspection/corrective work following the Cessna service bulletins referenced in the AD. \n- The regulator (Civil Aviation Safety Authority, via the AD) decides the required action, deadlines and acceptable procedures (by reference to specific service bulletin revisions).\n\n**Practical trade‑offs, costs and implementation considerations**\n\n- Direct costs: purchase of MK172‑25‑10C kits (if chosen) or labour and material cost to fabricate/install a steel lock rod/bar per the service bulletin; time out of service for the aeroplane while work is done; and any inspection costs for aircraft with earlier kits. \n- Concentrated benefit: kit manufacturers or MROs contracted to do the work will receive the purchase and service revenue. The safety benefit is concentrated on the specific aircraft/operators who avoid the particular failure mode. \n- Diffuse cost: all affected owners/operators share the compliance cost across the specified serial batches. \n- Implementation risk: fabricating a steel rod/bar (allowed as an alternative) depends on correct adherence to the service bulletin; variability in workmanship or interpretation could affect safety if not done exactly as required. \n- Compliance burden: owners must track aircraft TIS to meet the staged deadlines and must make the required log‑book entries. \n- Effect on private choice and business: the AD mandates a safety modification or inspection and limits choice to approved methods (specific kits or fabrication per service bulletin). Independent maintenance providers can perform the work if they follow the bulletin; this creates demand for MRO services but also enforces a single set of acceptable procedures.\n\n**Reference to the source**\n\n- The actions, acceptable alternatives and compliance times are set out in the AD under the Requirement and Compliance sections and cross‑reference Cessna Service Bulletins SB04‑25‑01 (Rev 4) and SB04‑25‑02 (Rev 1 or 2) and FAA AD 2007‑05‑10.\n\n**Net factual summary**\n\n- Mechanically: either fit the newer MK172‑25‑10C kit to each crew seat or fabricate/install an approved steel lock rod/bar, or (if an earlier kit is present) inspect and correct it. \n- Who is affected: owners/operators of the specific Cessna 182/T182 serial numbers listed. \n- Why it matters: to reduce the risk that a crew seat back lock will fail and allow uncontrolled rearward movement of the seat, with the safety consequences described in the AD."}},"importantCases":[],"_links":{"self":"/api/acts/ad-cessna-180-89-crew-seat-back-cylinder-lock-modification","history":"/api/acts/ad-cessna-180-89-crew-seat-back-cylinder-lock-modification/history","analysis":"/api/acts/ad-cessna-180-89-crew-seat-back-cylinder-lock-modification/analysis","conflicts":"/api/acts/ad-cessna-180-89-crew-seat-back-cylinder-lock-modification/conflicts","importantCases":"/api/acts/ad-cessna-180-89-crew-seat-back-cylinder-lock-modification/important-cases","documents":"/api/acts/ad-cessna-180-89-crew-seat-back-cylinder-lock-modification/documents"}}