{"id":"F2006B03527","name":"AD/BAe 146/8 Amdt 1 - Flaptrack 3 Lower Carriage Roller Bearings","slug":"ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43094,"registerId":"commonwealth-F2006B03527-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/8 Amdt 1 - Flaptrack 3 Lower Carriage Roller Bearings","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)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\nAD/BAe 146/8\n\nAmdt 1\n\n\nFlaptrack 3 Lower Carriage Roller Bearings 7/90\n\n \n\nApplicability: Series 100, 100A, 200 and 200A with serial nos listed in the Requirement document. Requirement:               Action in accordance with BAe SB 57-24-00911A Revision 2.\n\nCompliance: Prior to 31 May 1989.\n\n \n\nBackground:  Development testing has revealed that the roller bearing pins have insufficient strength to withstand the loads developed if the flaps jam under power. Amendment 1 updates the Requirement Document to Revision 2.\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 narrow, targeted safety directive addressing a specific mechanical defect in a specific aircraft type. Amendment 1 simply updates the referenced technical document to Revision 2. The scope remains tightly confined to the original safety issue."},"complexity_factors":["Single, specific mechanical component addressed (flaptrack 3 lower carriage roller bearings)","No defined terms section — uses plain technical language","Single cross-reference to manufacturer service bulletin (BAe SB 57-24-00911A Rev 2)","No conditional logic or nested exceptions","Extremely short document (approximately 150 words of substantive content)","Binary applicability test (specific serial numbers listed in external document)"],"plain_english_summary":"This is an **Airworthiness Directive** (a mandatory safety order) issued by Australia's Civil Aviation Safety Authority for specific British Aerospace BAe 146 aircraft.\n\n**What it does:**\nOrders owners/operators of certain BAe 146 series planes (100, 100A, 200, and 200A models with specific serial numbers) to inspect or replace the **flaptrack 3 lower carriage roller bearings** — a component in the wing flap system.\n\n**Why it matters:**\nTesting found that the roller bearing pins could break if the flaps jammed while being moved by engine power. A broken pin could cause the flaps to fail, potentially leading to loss of control during landing or takeoff.\n\n**What must be done:**\nFollow the instructions in **British Aerospace Service Bulletin 57-24-00911A Revision 2** (a technical repair notice from the manufacturer).\n\n**Deadline:**\nThe work had to be completed before **31 May 1989**.\n\n**Who it affects:**\nOperators of specific BAe 146 aircraft listed in the manufacturer's bulletin — primarily airlines or cargo operators flying these regional jets in Australia."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"Amendment 1 updates the Requirement Document to Revision 2 (Background). Mechanically, this changes which version of the manufacturer’s service bulletin operators must follow to comply. The extract does not indicate any change to the set of affected serial numbers (Applicability) or to the compliance deadline (Compliance)."},"complexity_factors":["Narrow, technical subject matter limited to a specific aircraft component (flaptrack 3 lower carriage roller bearings).","Prescriptive reference to an external technical document (BAe SB 57-24-00911A Revision 2) that contains the actionable steps.","Applicability tied to a serial-number list that is not included in the extract (requires cross-checking fleet records).","Fixed compliance deadline that forces scheduling and potential operational disruption.","Safety-critical nature increases scrutiny and reduces tolerance for non-standard implementation.","Dependence on manufacturer-defined procedures concentrates technical discretion in the service bulletin."],"plain_english_summary":"This Airworthiness Directive requires operators of specified BAe 146 Series 100/100A/200/200A aircraft (by serial number) to complete the actions in BAe Service Bulletin 57-24-00911A Revision 2 by 31 May 1989. It responds to test findings that roller bearing pins on the flaptrack 3 lower carriage may be too weak if flaps jam under power. Operators (or their maintenance providers) must schedule, pay for and record the mandated inspections/repairs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings","history":"/api/acts/ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings/history","analysis":"/api/acts/ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings/analysis","conflicts":"/api/acts/ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings/conflicts","importantCases":"/api/acts/ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings/important-cases","documents":"/api/acts/ad-bae-146-8-amdt-1-flaptrack-3-lower-carriage-roller-bearings/documents"}}