{"id":"F2006B02722","name":"AD/B727/22 - Main Landing Gear Actuator Beam - Inspection and Modification","slug":"ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42038,"registerId":"commonwealth-F2006B02722-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/22 - Main Landing Gear Actuator Beam - Inspection and Modification","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 727 Series Aeroplanes\n\n \n\nAD/B727/22  Main Landing Gear Actuator Beam - Inspection and Modification\n\n\n3/66\n\n \n\nApplicability: All models. Document: Boeing SB No. 32-76.\n\nCompliance: Inspect before 3,000 hours total time in service and thereafter at intervals not exceeding 200 hours time in service until modified in accordance with SB No. 32-76.\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\n \n\n \n\n \n\n \n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD's scope is limited to all Boeing 727 series aeroplanes and prescribes inspection intervals and a terminating modification per Boeing SB No. 32-76. The directive text does not indicate a change from that stated scope."},"complexity_factors":["Narrow operational requirement: single component (main landing gear actuator beam) on a specific airframe family (Boeing 727) (Applicability).","Clear timing rules: a one-time initial threshold (before 3,000 hours) and fixed recurrent interval (every 200 hours) until modification (Compliance).","Dependence on an external technical document for the modification procedure (Boeing SB No. 32-76) adds coordination between regulator, operator and the service bulletin (Document).","Binary compliance end-state: completion of the SB modification terminates the inspection requirement (Compliance).","Operational scheduling implications: recurring inspections or one-off modification require maintenance planning and downtime (implied by Compliance)."],"plain_english_summary":"This AD requires owners/operators and maintenance organisations of all Boeing 727 series aeroplanes to inspect the main landing gear actuator beam before 3,000 hours TIS and then every 200 hours TIS until the airplane is modified per Boeing Service Bulletin No. 32-76.  \n\nOperators can either perform recurring inspections or complete the SB 32-76 modification, which terminates the inspection requirement, creating a scheduling and cost trade-off."},"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 a specific aircraft type. It has not expanded beyond its original purpose of ensuring the airworthiness of Boeing 727 main landing gear actuator beams."},"complexity_factors":["Extremely short document (approximately 100 words of substantive content)","Only 2 defined references (Boeing SB No. 32-76 and the 3,000/200 hour intervals)","No cross-references to other legislation or regulations beyond the enabling authority (Civil Aviation Regulations 1998, Part 39)","Simple conditional logic: inspect at interval X until action Y is completed","Single applicability criterion (all Boeing 727 models)","No nested exceptions or sub-conditions"],"plain_english_summary":"**What this is:** This is an Airworthiness Directive (AD) — a mandatory safety order issued by the Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners and operators of **Boeing 727 series aeroplanes** to inspect a critical part called the **main landing gear actuator beam**. This component helps control the landing gear — the wheels that allow the plane to take off and land safely.\n\n**Who must comply:** Anyone operating a Boeing 727 in Australia, regardless of the specific model variant.\n\n**What must be done:**\n- **First inspection:** Must happen before the aircraft reaches 3,000 total flight hours.\n- **Ongoing inspections:** Every 200 flight hours after that, until a permanent fix is installed.\n- **Permanent fix:** The aircraft must be modified according to **Boeing Service Bulletin No. 32-76** (an official technical instruction from the manufacturer).\n\n**Why it matters:** Landing gear failures can be catastrophic. This directive prevents potential accidents by catching fatigue or damage in the actuator beam before it fails. The repetitive inspections act as a safety net until a permanent modification eliminates the risk entirely."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification","history":"/api/acts/ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification/history","analysis":"/api/acts/ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification/important-cases","documents":"/api/acts/ad-b727-22-main-landing-gear-actuator-beam-inspection-and-modification/documents"}}