{"id":"F2007L04008","name":"AD/B737/309 - Flightcrew Seat Locks and Seat Tracks - 2","slug":"ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":160801,"registerId":"commonwealth-F2007L04008-current","compilationNumber":null,"startDate":"2026-04-04","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 737 Series Aeroplanes","sectionType":"division","heading":"Boeing 737 Series Aeroplanes","content":"### Boeing 737 Series Aeroplanes\n\n| AD/B737/309 | Flightcrew Seat Locks and Seat Tracks - 2 | 11/2007 |\n| ----------- | ----------------------------------------- | ------- |\n\n| Applicability: | Boeing 737-300, -400, -500 series aircraft, variable numbers PS971 through PS978, PT187, and PT188, equipped with IPECO flightcrew seats.                                                                                                                                                                                                                                                                                                    |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Inspect in accordance with the technical requirements of FAA AD 2007-18-03 Amdt 39-15183.                                                                                                                                                                                                                                                                                                                                                    |\n| Compliance:    | Within 90 days after 25 October 2007. If a defect is found in accordance with the technical requirements of FAA AD 2007-18-03 Amdt 39-15183, the defect must be rectified before further flight.                                                                                                                                                                                                                                             |\n|                | This Airworthiness Directive becomes effective on 25 October 2007.                                                                                                                                                                                                                                                                                                                                                                           |\n| Background:    | This Airworthiness Directive results from a report indicating that a captain's seat slid aft and jammed during taxi. The Airworthiness Directive is issued to prevent uncommanded movement of the flightcrew seats during acceleration and take-off of the aeroplane, which could result in reduced controllability of the aeroplane.This Airworthiness Directive is the same issue as covered by AD/B737/145 but covers different aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n10 September 2007","sortOrder":0},{"sectionNumber":"AD/B737/309","sectionType":"part","heading":"AD/B737/309","content":"## AD/B737/309","sortOrder":1},{"sectionNumber":"Flightcrew Seat Locks and Seat Tracks - ","sectionType":"part","heading":"Flightcrew Seat Locks and Seat Tracks - 2","content":"## Flightcrew Seat Locks and Seat Tracks - 2","sortOrder":2},{"sectionNumber":"11/2007","sectionType":"part","heading":"11/2007","content":"## 11/2007","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Background notes this AD addresses the same seat-sliding issue as AD/B737/145 but “covers different aircraft.” The current instrument specifically targets Boeing 737-300/-400/-500 airframes with listed variable numbers and IPECO seats (Applicability; Background), so it extends or redirects the earlier AD’s coverage to a different subset of aircraft."},"complexity_factors":["Cross-reference to external technical mandate: requires inspection “in accordance with the technical requirements of FAA AD 2007-18-03 Amdt 39-15183” (Requirement) — the AD does not reproduce those technical steps.","Narrow, technical applicability: applies only to Boeing 737-300/-400/-500 with specified variable numbers PS971–PS978, PT187, PT188 and equipped with IPECO flightcrew seats (Applicability) — identifying affected airframes requires operators to check serial/variable numbers.","Compliance deadline and operational constraint: inspections due within 90 days after 25 October 2007, and any defect must be rectified before further flight (Compliance) — creates a short-window maintenance workload and potential short-term grounding.","Clear corrective mandate: defect rectification required before further flight (Compliance) — gives no discretion to defer repairs once a defect is found.","Background link to prior AD: states same safety issue as AD/B737/145 but covers different aircraft (Background) — indicates scope adjustment relative to earlier action."],"plain_english_summary":"Requires operators of certain Boeing 737-300, -400 and -500 aircraft fitted with IPECO flightcrew seats (specific serial numbers listed) to inspect seat locks and seat tracks following the technical steps in FAA AD 2007-18-03, with any defect fixed before the aircraft flies again. The measure responds to a reported captain’s seat sliding aft and jamming and sets a 90-day compliance deadline from 25 October 2007 to reduce the risk of uncommanded seat movement during take-off."},"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 is a standard, narrow airworthiness directive addressing a specific mechanical defect on specific aircraft. It has not expanded beyond its original safety purpose."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (specific aircraft serial numbers)","Single cross-reference to external FAA technical document","Simple binary compliance: inspect, and if defect found, fix before flight","No nested conditions, exceptions, or interpretive provisions","Straightforward temporal trigger (90 days from effective date)"],"plain_english_summary":"This AD mandates inspections and corrective action on the captain’s and first officer’s seat locks and tracks on certain Boeing 737-300/-400/-500 aeroplanes equipped with specific IPECO flightcrew seats (listed serials). It follows an incident where a captain’s seat slid rearward and jammed, risking loss of control reach.\n\nAirlines/operators of affected aircraft must inspect and fix defects before the aeroplane flies again, within 90 days of 25 October 2007."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2","history":"/api/acts/ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2/history","analysis":"/api/acts/ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2/analysis","conflicts":"/api/acts/ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2/conflicts","importantCases":"/api/acts/ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2/important-cases","documents":"/api/acts/ad-b737-309-flightcrew-seat-locks-and-seat-tracks-2/documents"}}