{"id":"F2006B02827","name":"AD/B737/126 - Body Station 1088 Bulkhead Terminal Support Fitting Bolts","slug":"ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42169,"registerId":"commonwealth-F2006B02827-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/126 - Body Station 1088 Bulkhead Terminal Support Fitting Bolts","content":"---\nmeta-content-style-type: text/css\nmeta-content-type: application/xhtml+xml; charset=utf-8\nmeta-generator: Aspose.Words for .NET 22.10.0\n---\n\n?xml version=\"1.0\" encoding=\"utf-8\" standalone=\"no\"?>\n\nCOMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Boeing 737 Series Aeroplanes\n\n \n\n# AD/B737/126 Body Station 1088 Bulkhead Terminal\n\nSupport Fitting Bolts\n\nApplicability: Model 737-100, -200, and -300 series aircraft, line numbers 1 through 1485.\n\n# 5/99\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 99-04-23 Amdt 39- 11048.\n\n \n\nNote: Boeing Service Bulletin 737-53-1107 refers.\n\n \n\nCompliance: As specified in the Requirement Document for the initial and repeat inspections/actions.\n\n \n\nThis Airworthiness Directive becomes effective on 20 May 1999.\n\n \n\nBackground:  The FAA received reports that bolts that attach the terminal support fittings to the upper part of the Body Station 1088 bulkhead were found broken. Broken terminal support fitting bolts could result in reduced structural integrity of the vertical fin installation and possible loss of the vertical fin.\n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific mechanical defect in specific aircraft. It has not expanded beyond its original purpose of mandating inspection/repair of bulkhead terminal support fitting bolts."},"complexity_factors":["Very short document (under 300 words)","Only 1 defined applicability criterion (aircraft model and line numbers)","Single requirement that cross-references an external FAA directive rather than setting out detailed technical steps","No nested exceptions or conditional logic","Minimal legislative machinery — essentially a 'pointer' document directing operators to technical aviation standards"],"plain_english_summary":"This CASA Airworthiness Directive mandates inspections and repairs of support‑fitting bolts on early Boeing 737 (-100/-200/-300, S/N 1–1485) that attach a bulkhead near the tail. It affects any operator of those aircraft in Australia because broken bolts could weaken the fuselage‑to‑vertical‑fin connection and risk fin separation. Compliance follows FAA AD 99‑04‑23 and Boeing SB 737‑53‑1107; effective 20 May 1999."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The directive applies to the stated Boeing 737 models and line numbers and requires the inspections/actions specified in FAA AD 99-04-23 (with Boeing Service Bulletin guidance). The text does not expand or narrow that applicability compared with the cited FAA requirement; it adopts the FAA technical requirements for the identified fleet."},"complexity_factors":["Incorporates an external Requirement Document (FAA AD 99-04-23) rather than setting technical work in the text, so compliance depends on another instrument.","Technical inspections and repeat action regime require maintenance planning and qualified labour to assess and, if necessary, replace bolts.","Applicability limited by model and line numbers (737-100/-200/-300, line numbers 1–1485), adding tracking effort to determine affected fleet members.","Reference to Boeing Service Bulletin 737-53-1107 introduces a manufacturer procedural standard that operators must follow.","Risk-driven urgency: potential for reduced structural integrity of the vertical fin raises safety-critical repair standards and recordkeeping.","Compliance timing and specific procedures are delegated to the cited Requirement Document, creating administrative dependence on external publication and amendments."],"plain_english_summary":"Requires operators of Boeing 737-100, -200 and -300 series (line numbers 1–1485) to carry out the initial and repeat inspections and any corrective actions set out in FAA AD 99-04-23 (and referenced Boeing Service Bulletin) for the bolts that secure the terminal support fittings at Body Station 1088. It affects aircraft owners and maintenance organisations, who must schedule inspections, perform repairs, record compliance and bear associated costs; the measure aims to prevent loss of vertical fin integrity from broken bolts."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts","history":"/api/acts/ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts/history","analysis":"/api/acts/ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts/analysis","conflicts":"/api/acts/ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts/conflicts","importantCases":"/api/acts/ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts/important-cases","documents":"/api/acts/ad-b737-126-body-station-1088-bulkhead-terminal-support-fitting-bolts/documents"}}