{"id":"F2006B10922","name":"AD/JETSTREAM/52 - Escape Hatch Shear Fitting","slug":"ad-jetstream-52-escape-hatch-shear-fitting","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56465,"registerId":"commonwealth-F2006B10922-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JETSTREAM/52 - Escape Hatch Shear Fitting","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)  \nBritish Aerospace BAe 3100 (Jetstream) Series Aeroplanes\n\nAD/JETSTREAM/52 Escape Hatch Shear Fitting 3/92\n\nApplicability: Models and Constructor’s numbers identified in accordance with the following Accomplishment Instruction Parts of BAe Service Bulletin 52-JM 7752:\n\nPart A \\- Jetstream Series 3100 aircraft constructors number 757, and aircraft with constructors numbers in the range 770 to 839 inclusive.\n\nJetstream Series 3200 aircraft with constructors numbers in the range 790 to 910 inclusive and 912.\n\nPart B \\- Jetstream Series 3200 aircraft with constructors numbers in the range 790 to 910 inclusive and 912.\n\nRequirement: Action in accordance with Mandatory British Aerospace SB 52-JM 7752. Compliance: At the next scheduled 600 hour maintenance check after 6 March 1992 or by 6 July\n\n1992; whichever occurs first.\n\nBackground: During a scheduled inspection on an in-service aircraft, an escape hatch could not be removed without damaging the ceiling trim, due to interference between the shear fitting on the hatch and a furnishing ceiling panel. This interference can prevent removal of the escape hatch in an emergency. The compliance date required by the UK CAA is extended by two months.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive maintains its original technical scope — it applies to the listed Jetstream constructor’s numbers and requires action per SB 52‑JM 7752 (Applicability; Requirement). The only scheduling change noted is an extension of the compliance date by two months compared with the UK CAA timetable (Background), not a change to which aircraft or which corrective action are required (Compliance; Requirement)."},"complexity_factors":["Narrow applicability defined by specific constructor’s numbers (Applicability).","Mandates compliance with an external document (Mandatory British Aerospace SB 52‑JM 7752) rather than prescribing technical steps in the instrument (Requirement).","Firm compliance timing tied to maintenance cycles (next scheduled 600‑hour check) or an absolute date (Compliance) — requires operators to coordinate scheduling and possible expedited work.","Technical/maintenance action likely requires qualified maintenance facilities and parts, creating practical implementation constraints (Requirement + Background).","Small operational population concentrates compliance obligations on affected operators, increasing per-operator administrative/financial burden (Applicability).","Regulatory amendment only adjusts compliance timing (Background), so legal scope is simple but operational logistics may be non-trivial."],"plain_english_summary":"Requires operators of specified British Aerospace Jetstream 3100/3200 aeroplanes (listed by constructor’s number) to carry out the work set out in Mandatory British Aerospace Service Bulletin 52‑JM 7752 to remove interference between an escape-hatch shear fitting and a ceiling panel. Compliance must be done at the next scheduled 600‑hour maintenance check after 6 March 1992 or by 6 July 1992, whichever is earlier. Operators pay for the inspection/modification and must schedule maintenance to avoid a potential obstruction to emergency hatch removal."},"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This is a discrete, time-bound airworthiness directive addressing a specific mechanical defect on specific aircraft. It has not expanded beyond its original purpose of ensuring emergency exit functionality."},"complexity_factors":["Short, single-purpose directive with one specific mechanical issue","Only 2 defined applicability categories (Part A and Part B) based on aircraft constructor numbers","Single cross-reference to external technical document (BAe Service Bulletin 52-JM 7752)","Simple binary compliance deadline (whichever occurs first of two dates)","No nested exceptions, conditional logic, or interpretive provisions","Total length under 200 words"],"plain_english_summary":"This CASA Airworthiness Directive orders owners/operators of specified British Aerospace Jetstream 3100/3200 aircraft (listed by construction/serial numbers) to inspect and, if necessary, repair the escape hatch shear fitting per British Aerospace Service Bulletin 52-JM 7752. The defect can block emergency exit removal and endanger evacuation. Compliance is required by the earlier of the next 600-hour check after 6 March 1992 or 6 July 1992."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jetstream-52-escape-hatch-shear-fitting","history":"/api/acts/ad-jetstream-52-escape-hatch-shear-fitting/history","analysis":"/api/acts/ad-jetstream-52-escape-hatch-shear-fitting/analysis","conflicts":"/api/acts/ad-jetstream-52-escape-hatch-shear-fitting/conflicts","importantCases":"/api/acts/ad-jetstream-52-escape-hatch-shear-fitting/important-cases","documents":"/api/acts/ad-jetstream-52-escape-hatch-shear-fitting/documents"}}