{"id":"F2006B02750","name":"AD/B727/49 - Main Landing Gear Door Actuator Fitting - Replacement","slug":"ad-b727-49-main-landing-gear-door-actuator-fitting-replacement","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42092,"registerId":"commonwealth-F2006B02750-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/49 - Main Landing Gear Door Actuator Fitting - Replacement","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/B727/49 Main Landing Gear Door Actuator Fitting - Replacement\n\n\n6/67\n\n \n\nApplicability: All models. Document: Boeing SB No. 32-96.\n\nCompliance: Before 18,000 hours total time in service.\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 text provided sets a specific required modification (replacement of the main landing gear door actuator fitting), identifies the implementing technical document (Boeing SB No. 32-96), and sets a firm compliance deadline (before 18,000 hours total time in service). The AD text does not indicate any expansion or narrowing of scope compared with its stated content, nor does it reference prior or superseded directives in the extract provided. On that basis, there is no indication in the supplied text that scope has changed from the instrument's own stated requirement."},"complexity_factors":["Narrow, single-component mandate (simple substantive requirement). (AD/B727/49 — Main Landing Gear Door Actuator Fitting - Replacement)","Clear, time-based compliance deadline (low interpretive complexity). (Compliance: Before 18,000 hours total time in service)","Reliance on an external technical document (Boeing SB No. 32-96) increases practical complexity because implementers must obtain and follow that bulletin. (Document: Boeing SB No. 32-96)","Lack of procedural detail in the AD text about funding, certification of completion, reporting, or exemptions increases operational uncertainty for implementers.","Applicability to all models concentrates impact on the entire fleet, requiring broad operational coordination. (Applicability: All models)"],"plain_english_summary":"The AD mandates replacement of the main landing gear door actuator fitting on all Boeing 727 models, to be done in accordance with Boeing Service Bulletin No. 32-96, and completed before each aeroplane reaches 18,000 hours total time in service. It affects all 727 owners/operators and creates a compliance dependency on the Boeing SB; the AD text does not allocate costs or detail certification, reporting, or enforcement procedures."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, single-issue airworthiness directive focused specifically on the Boeing 727 main landing gear door actuator fitting. It has not expanded beyond its original safety purpose. The directive appears to be an original issuance (reference number 6/67 suggests 1967 origin) and maintains its narrow, technical scope."},"complexity_factors":["Extremely short document (under 200 words)","Only 3 operative provisions: applicability, technical reference, and compliance deadline","No defined terms section","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Single, unambiguous compliance trigger (18,000 hours time-in-service)","No exceptions, exemptions, or conditional logic"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It requires owners and operators of **Boeing 727 aircraft** to replace a specific part: the **main landing gear door actuator fitting**.\n\n**What it does:**\n- Mandates replacement of a mechanical fitting that controls the main landing gear doors\n- Cites Boeing Service Bulletin 32-96 as the technical reference for how to do the work\n\n**Who it affects:**\n- All Boeing 727 models (passenger and cargo variants)\n- Airlines, cargo operators, and private owners flying these aircraft in Australia\n\n**Why it matters:**\n- Landing gear door failures can cause serious safety hazards during takeoff or landing\n- The directive sets a hard deadline: **before the aircraft reaches 18,000 total flight hours**\n- Non-compliance grounds the aircraft — it cannot legally fly until fixed\n\n**Key point:** This is a \"life limit\" directive. Once a 727 hits 18,000 hours, it must have this fix done or stop flying."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-49-main-landing-gear-door-actuator-fitting-replacement","history":"/api/acts/ad-b727-49-main-landing-gear-door-actuator-fitting-replacement/history","analysis":"/api/acts/ad-b727-49-main-landing-gear-door-actuator-fitting-replacement/analysis","conflicts":"/api/acts/ad-b727-49-main-landing-gear-door-actuator-fitting-replacement/conflicts","importantCases":"/api/acts/ad-b727-49-main-landing-gear-door-actuator-fitting-replacement/important-cases","documents":"/api/acts/ad-b727-49-main-landing-gear-door-actuator-fitting-replacement/documents"}}