{"id":"F2006B03516","name":"AD/BAe 146/68 - Eye Bolt and Piston Rod Threads of MLG Retraction Actuator","slug":"ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43081,"registerId":"commonwealth-F2006B03516-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/68 - Eye Bolt and Piston Rod Threads of MLG Retraction Actuator","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 146/68 Eye Bolt and Piston Rod Threads\n\nof MLG Retraction Actuator\n\n\n13/97\n\n \n\nApplicability: All BAe 146 and Avro 146-RJ Series aircraft, fitted with main landing gear actuators Part/Type No. 104628002, 104628003 (as listed in Dowty Aerospace Hydraulics- Cheltenham Service Bulletin 146-32-507).\n\n \n\nRequirement: Inspect in accordance with British Aerospace Mandatory Service Bulletin 32-145. Compliance:              As specified in the requirement document.\n\nThis airworthiness directive becomes effective on 4 December 1997.\n\n \n\nBackground: Instances of corrosion of the eyebolt and piston rod threads on the retraction actuator has occurred on in-service aircraft main landing gears.\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 identified in service. It has not expanded beyond its original purpose of mandating inspections for corrosion in specific landing gear components."},"complexity_factors":["Very short document (approximately 150 words)","Only 2 defined part numbers in the applicability section","Single requirement referencing an external technical document (Service Bulletin 32-145)","No nested conditional logic or exceptions","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Straightforward command structure: identify affected aircraft → inspect → comply by deadline"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of certain British Aerospace BAe 146 and Avro 146-RJ aircraft to inspect a specific mechanical part — the **main landing gear retraction actuator** (the hydraulic device that extends and retracts the wheels). The inspection focuses on **corrosion damage to threaded components** (the eye bolt and piston rod threads) that could cause the landing gear to fail.\n\n**Who it affects:** \n- Operators of BAe 146 and Avro 146-RJ series aircraft\n- Specifically those with main landing gear actuators bearing part numbers 104628002 or 104628003\n\n**Why it matters:** Corrosion in these threads has already been found on aircraft in active service. If left unchecked, this could lead to **landing gear collapse or failure to deploy** — a catastrophic safety risk during takeoff or landing.\n\n**What must be done:** Aircraft operators must follow the inspection procedures laid out in **British Aerospace Mandatory Service Bulletin 32-145** by the compliance deadline specified in that document. The directive took effect on **4 December 1997**."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The directive sets a targeted inspection obligation for specified actuators and cites a service bulletin for procedures and timing. The document contains no indication that the applicability or substantive scope was altered from its stated purpose; it confines action to the listed aircraft and parts and delegates procedural detail to the referenced service bulletin."},"complexity_factors":["Narrow technical scope: applies only to BAe 146 and Avro 146‑RJ aircraft with actuators Part/Type No. 104628002 or 104628003 (Applicability).","Dependence on external mandated document: inspection content and timing are specified by British Aerospace Mandatory Service Bulletin 32‑145 (Requirement; Compliance: 'As specified in the requirement document').","Safety‑critical inspection tasks: concerns corrosion of eyebolt and piston‑rod threads on main landing‑gear retraction actuator (Background), which raises operational scrutiny despite limited regulatory text.","Limited procedural detail in the AD itself: the AD delegates procedural steps and compliance timing to the service bulletin, increasing the need to consult external material (Requirement; Compliance).","Fixed effective date creates an enforceable deadline for operators to follow the external instructions (effective date: 'becomes effective on 4 December 1997')."],"plain_english_summary":"This airworthiness directive requires operators of BAe 146 and Avro 146‑RJ aircraft fitted with specified main landing‑gear retraction actuators to inspect the eyebolt and piston‑rod threads in line with British Aerospace Mandatory Service Bulletin 32‑145. It targets a corrosion problem on those actuator threads that could affect main landing‑gear retraction; compliance must follow the inspection steps and timing set out in the referenced service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator","history":"/api/acts/ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator/history","analysis":"/api/acts/ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator/analysis","conflicts":"/api/acts/ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator/conflicts","importantCases":"/api/acts/ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator/important-cases","documents":"/api/acts/ad-bae-146-68-eye-bolt-and-piston-rod-threads-of-mlg-retraction-actuator/documents"}}