{"id":"F2006B02971","name":"AD/B737/70 - Thrust Reverser - Auxiliary Slider Track Liner","slug":"ad-b737-70-thrust-reverser-auxiliary-slider-track-liner","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42330,"registerId":"commonwealth-F2006B02971-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B737/70 - Thrust Reverser - Auxiliary Slider Track Liner","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\nAD/B737/70 Thrust Reverser - Auxiliary Slider Track Liner 11/92\n\nApplicability: All Model 737-300, -400 and -500 series.\n\n \n\nRequirement: Action in accordance with the technical requirements of FAA AD 91-25-06.\n\n \n\nNote: Boeing Service Bulletin 737-78-1048 Revision 1 refers.\n\nCompliance: As detailed in the Requirement Document with an effective date of 15 October 1992. Background:               Inspection, repair and replacement as necessary of each thrust reverser auxiliary track,\n\ntrack liner and slider fitting has been prompted by two in-flight incidents in which a\n\nthrust reverser translating sleeve panel has separated from the aircraft.\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\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 models. It has not expanded beyond its original purpose of mandating inspection/repair of thrust reverser components."},"complexity_factors":["Very short document (approximately 200 words)","Only 3 defined applicability criteria (specific aircraft models)","Single requirement referencing external technical documents rather than spelling out procedures","No nested exceptions or conditional logic","No cross-references to other legislation beyond the parent Civil Aviation Regulations 1998","Straightforward compliance deadline"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific Boeing 737 aircraft.\n\n**What it does:**\n- Requires owners and operators of Boeing 737-300, -400, and -500 series planes to inspect, repair, or replace parts of the **thrust reverser** system — specifically the auxiliary slider track, track liner, and slider fitting.\n- A thrust reverser is the equipment on jet engines that helps slow the plane down after landing by redirecting thrust forward. The \"translating sleeve\" is the part that moves when the reverser deploys.\n\n**Why it matters:**\n- Two planes experienced **in-flight separations** where a thrust reverser panel fell off during flight. This creates serious safety risks — debris could strike the aircraft or people on the ground, and the loss of the panel could affect engine performance or aerodynamics.\n\n**Who must comply:**\n- Anyone operating the affected Boeing 737 models in Australia.\n\n**What they must do:**\n- Follow the technical instructions in **FAA AD 91-25-06** (a US safety order that Australia is adopting) and **Boeing Service Bulletin 737-78-1048 Revision 1** (the manufacturer's repair instructions).\n- Complete the work by **15 October 1992**.\n\n**In short:** If you fly one of these Boeing 737s in Australia, you must check and fix the thrust reverser tracks by the deadline to prevent panels from falling off mid-flight."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to the set of Boeing 737 models listed (Applicability) and requires inspection and corrective action as described (Requirement; Background). The text indicates the directive responds directly to two in-flight incidents and implements inspections, repairs and replacements in line with that purpose; there is no indication in the provided text that the scope has been expanded or narrowed from that stated objective."},"complexity_factors":["Short, single-issue directive limited to specific 737 models (Applicability).","Relies on an external FAA Airworthiness Directive for technical requirements rather than containing technical detail itself (Requirement).","References an additional supplier document (Boeing Service Bulletin 737-78-1048 Rev 1), creating layered sources to consult (Note).","Operational complexity arises from variable repair needs—inspections may lead to different extents of repair or replacement depending on findings (Background).","Implementation requires coordination between operators, maintenance providers and parts suppliers, and scheduling within maintenance windows (implied by Requirement and Background)."],"plain_english_summary":"CASA requires operators of Boeing 737-300/400/500 aircraft to inspect and, if necessary, repair or replace thrust reverser auxiliary tracks, track liners and slider fittings after two in‑flight panel separations.  \n\nThe directive mandates following FAA AD 91‑25‑06 and references Boeing Service Bulletin 737‑78‑1048 Rev 1 for technical detail, took effect 15 Oct 1992, and places inspection and remediation costs and scheduling on aircraft owners/operators."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b737-70-thrust-reverser-auxiliary-slider-track-liner","history":"/api/acts/ad-b737-70-thrust-reverser-auxiliary-slider-track-liner/history","analysis":"/api/acts/ad-b737-70-thrust-reverser-auxiliary-slider-track-liner/analysis","conflicts":"/api/acts/ad-b737-70-thrust-reverser-auxiliary-slider-track-liner/conflicts","importantCases":"/api/acts/ad-b737-70-thrust-reverser-auxiliary-slider-track-liner/important-cases","documents":"/api/acts/ad-b737-70-thrust-reverser-auxiliary-slider-track-liner/documents"}}