{"id":"F2006B04317","name":"AD/BEECH 99/7 - Pilot and Co-Pilot Chair Locking Mechanism","slug":"ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":44132,"registerId":"commonwealth-F2006B04317-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BEECH 99/7 - Pilot and Co-Pilot Chair Locking Mechanism","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)  \nBeechcraft 99 Series Aeroplanes\n\nAD/BEECH 99/7 Pilot and Co-Pilot Chair Locking Mechanism 7/97\n\nApplicability: Models 99, 99A, A99A, B99, and C99 Airliner with serial numbers U-1 through U-239.\n\nRequirement: a. Inspect the pilot and co-pilot chairs to assure that the locking pins will fully engage in the seat tracks, in accordance with the “Accomplishment Instructions” section of Beech Service Bulletin 2444 Revision II.\n\nb. Modify any chair where the locking pin fails to fully engage or is misaligned, in accordance with the maintenance manual as specified in Beech Service Bulletin 2444, Revision II.\n\nNote: FAA AD 97-06-06 Amdt 39-9963 refers.\n\nCompliance: Unless already accomplished, within 150 hours’ time in service after 19 June 1997.\n\nThis airworthiness directive becomes effective on 19 June 1997.\n\nBackground: The FAA received reports of pilot and co-pilot chair locking pin malfunctions, which in one instance caused the pilot chair to slide back from the full forward position.\n\nThe FAA AD requires the inspection to be accomplished in accordance with revised service information, as reflected in Revision II of the requirement document.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on seat locking mechanisms in a defined aircraft series. It has not expanded beyond its original safety purpose."},"complexity_factors":["Single, specific mechanical issue (seat locking pins)","Only two operative requirements: inspect and modify if needed","Clear applicability criteria (specific models and serial number range)","Single compliance deadline (150 hours time-in-service)","No nested exceptions or conditional logic","References external technical documents but does not reproduce them","Total length: approximately 200 words"],"plain_english_summary":"This Airworthiness Directive requires owners/operators of Beechcraft 99-series airliners (serials U-1 to U-239) to inspect pilot and co‑pilot seats for proper locking‑pin engagement and to modify any seats that don’t fully engage, within 150 flight hours of 19 June 1997. It responds to reported in‑flight seat lock failures (including a rearward slide) that risk loss of control, and adopts FAA AD 97-06-06 with reference to Beech Service Bulletin 2444 Rev II."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive keeps a narrowly targeted scope: inspect and modify pilot/co‑pilot seat locking pins on identified Beechcraft 99 serial numbers per Beech Service Bulletin 2444 Revision II. It implements FAA-revised service instructions but does not broaden the affected fleet or add unrelated requirements."},"complexity_factors":["Narrow applicability: specific models and serial numbers (Models 99, 99A, A99A, B99, C99; U-1 to U-239).","Normative reliance on external document: Beech Service Bulletin 2444 Revision II contains the detailed ‘how-to’.","Technical work required: inspection for pin engagement and alignment; modification if misaligned (maintenance-level tasks).","Fixed compliance window: 150 hours TIS after 19 June 1997 imposes scheduling pressure on operators.","Regulatory cross-reference: mirrors and depends on FAA AD 97-06-06, creating inter-jurisdictional tracing for compliance history.","Potential operational impact: aircraft may be temporarily unserviceable until corrective work is completed."],"plain_english_summary":"Mandates inspection and, if needed, modification of pilot and co‑pilot seat locking pins on Beechcraft 99 series (serials U‑1 to U‑239) to ensure pins fully engage, using Beech Service Bulletin 2444 Revision II. Operators/owners must perform the work within 150 hours' time‑in‑service after 19 June 1997; costs of inspection, parts and maintenance fall to them. The AD responds to reported seat‑slide incidents and follows FAA revised service instructions; it substitutes an operational safety requirement for private maintenance scheduling and may temporarily remove aircraft from service until corrected."}},"importantCases":[],"_links":{"self":"/api/acts/ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism","history":"/api/acts/ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism/history","analysis":"/api/acts/ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism/analysis","conflicts":"/api/acts/ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism/conflicts","importantCases":"/api/acts/ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism/important-cases","documents":"/api/acts/ad-beech-99-7-pilot-and-co-pilot-chair-locking-mechanism/documents"}}