{"id":"F2006B02190","name":"AD/AC-112/6 Amdt 4 - Front Seat and Shoulder Harness","slug":"ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41420,"registerId":"commonwealth-F2006B02190-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/AC-112/6 Amdt 4 - Front Seat and Shoulder Harness","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)  \nGulfstream (Rockwell) 112 Series Aeroplanes\n\nAD/AC-112/6\n\nAmdt 4\n\n  \nFront Seat and Shoulder Harness 7/87\n\nApplicability: All models 112 and 112B with S/Nos 3 to 544 and 13000, Models 112TC and 112TCA with S/Nos 13001 to 13309.\n\nRequirement: Unless already accomplished modify the front seats and belt attachments in accordance with either.\n\n    Rockwell Service Bulletin SB-112-45A, or\n\n    b. Gulfstream Aerospace SB-112-70A Rev 1.\n\nCompliance: Within 100 hours’ time in service after 30 June 1987 but not later than 30 June 1988.\n\nBackground: This Directive is amended to reflect the resolution of the problems affecting earlier issues. It should be noted that whilst the Rockwell Bulletin modifies the aircraft seats and belts to the minimum acceptable standard required by ANO 101.22 there have been accidents overseas which were classified as surviveable, in which the seat occupants were fatally injured. Following those accidents the Gulfstream Bulletin was issued which increased the margin of safety to compensate for the fuselage deflection phenomena of this aircraft design.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is Amendment 4 to an existing Airworthiness Directive. The scope remains tightly focused on the original safety issue (front seat and shoulder harness integrity in Gulfstream 112 series aircraft). The amendment appears to clarify compliance paths and address \"problems affecting earlier issues\" without expanding the directive's reach to new aircraft types or systems."},"complexity_factors":["Single, clearly defined applicability clause covering specific serial number ranges","Binary choice between two technical compliance paths (Rockwell or Gulfstream bulletin)","Simple time-based compliance window (100 hours TIS or fixed calendar date, whichever comes first)","No nested exceptions, conditional logic, or cross-references to other legislation","Short document (approximately 200 words) with minimal defined terms","Single substantive requirement with clear technical references"],"plain_english_summary":"This CASA Airworthiness Directive mandates upgrading front seats and shoulder-harness attachments on specified Gulfstream/Rockwell 112-series aeroplanes (certain serial numbers) to address fatal failures from fuselage deflection in crashes. Work must follow either Rockwell SB‑112‑45A (minimum) or the stronger Gulfstream SB‑112‑70A Rev‑1 (recommended), completed within 100 flight hours after 30 June 1987 or by 30 June 1988. It closes a gap between legal compliance and real crash survivability."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The directive was amended to reflect resolution of earlier problems and to add/endorse Gulfstream SB-112-70A Rev 1, which increases the safety margin to compensate for fuselage deflection identified after survivable accidents. That change moved the practical compliance options from a single minimum-standard modification (Rockwell SB meeting ANO 101.22) to include a higher-strength alternative (Background; Requirement)."},"complexity_factors":["Narrow applicability: multiple model types and a specific range of serial numbers must be identified for compliance (Applicability).","Choice of corrective actions: operator may comply with either Rockwell SB-112-45A or Gulfstream SB-112-70A Rev 1, which differ in safety margin (Requirement).","Hard deadline with flight-hour trigger: compliance is within 100 hours’ time in service after 30 June 1987 but cannot be later than 30 June 1988 — creates scheduling and tracking burden (Compliance).","Compliance cost and logistics borne by aircraft owners/operators: parts, labour and downtime to modify seats and belt attachments are required (Requirement).","Regulatory baseline vs. enhanced option: Rockwell modification meets the minimum ANO 101.22 standard, while Gulfstream’s bulletin increases margin to address fuselage deflection seen in accidents — operators must choose between minimum compliance or higher-strength fix (Background, Requirement).","Amendment history and safety rationale: directive was amended to reflect resolution of earlier problems and to respond to overseas accidents, which may affect interpretation and enforcement (Background).","Single-authority enforcement: issued under the Civil Aviation Safety Authority schedule of airworthiness directives, concentrating decision and compliance oversight (document header)."],"plain_english_summary":"This airworthiness directive orders owners/operators of specified Gulfstream (Rockwell) 112-series aeroplanes (listed serial numbers) to modify front seats and shoulder-belt attachments using either Rockwell SB-112-45A or Gulfstream SB-112-70A Rev 1. It must be done within 100 hours’ time in service after 30 June 1987 and no later than 30 June 1988. The Gulfstream procedure increases the safety margin after survivable accidents showed fuselage-deflection risks; the Rockwell procedure meets the minimum regulatory standard."}},"importantCases":[],"_links":{"self":"/api/acts/ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness","history":"/api/acts/ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness/history","analysis":"/api/acts/ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness/analysis","conflicts":"/api/acts/ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness/conflicts","importantCases":"/api/acts/ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness/important-cases","documents":"/api/acts/ad-ac-112-6-amdt-4-front-seat-and-shoulder-harness/documents"}}