{"id":"F2006B02654","name":"AD/B727/132 - Number Two Cargo Doorway Frames","slug":"ad-b727-132-number-two-cargo-doorway-frames","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41970,"registerId":"commonwealth-F2006B02654-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/132 - Number Two Cargo Doorway Frames","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/B727/132 Number Two Cargo Doorway Frames 6/91\n\nApplicability: Model 727 series, listed in Boeing Alert SB 727-53A 0199.\n\n \n\nRequirement: Action in accordance with the Technical Requirements of FAA AD 91-07-11 Amdt 39-6946.\n\n \n\nNote: Boeing Alert SB 727-53A0199 refers.\n\n \n\nCompliance: As specified in the Requirement document with a revised effective date of 13 June 1991 for Australian registered aircraft.\n\n \n\nBackground: The FAA has received reports of cracks in the forward and aft frame webs. This condition, if not corrected, could result in failure of the No. 2 cargo doorway frames and depressurisation of the aircraft. Effective date required by FAA is extended by six weeks.\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 structural defect in a specific aircraft model. It has not expanded beyond its original purpose of mandating inspection/repair of cargo doorway frame cracks."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability reference (Boeing Alert SB 727-53A0199)","Single requirement incorporating external document by reference (FAA AD 91-07-11)","No nested conditions, exceptions, or procedural subsections","Straightforward compliance deadline with simple extension calculation"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order — issued by Australia's Civil Aviation Safety Authority (CASA) for **Boeing 727 aircraft**.\n\n**What it does:**\n- Requires owners/operators of certain Boeing 727 series planes to inspect and fix cracks found in the **Number 2 cargo doorway frames** (the structural parts around a specific cargo door).\n- The cracks were reported in the \"forward and aft frame webs\" — metal parts that help hold the door frame together.\n\n**Why it matters:**\n- If left unfixed, these cracks could cause the cargo door frame to fail, leading to **sudden depressurisation of the aircraft** — a serious safety risk at altitude.\n\n**Who must comply:**\n- Operators of Boeing 727 models listed in **Boeing Alert Service Bulletin 727-53A0199**.\n\n**What action is required:**\n- Follow the technical instructions in **FAA AD 91-07-11** (the US aviation safety regulator's equivalent order).\n- The deadline for Australian-registered aircraft is **13 June 1991** — six weeks later than the US effective date, giving local operators extra time.\n\n**In short:** If you own or operate one of these specific Boeing 727s in Australia, you must check for cracks around the Number 2 cargo door and repair them by mid-June 1991, or the plane isn't airworthy."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The directive adopts the FAA AD's technical requirements but revises the implementation timing for Australian-registered aircraft: CASA set a revised effective date of 13 June 1991, extending the FAA's effective date by six weeks. Other substantive scope (applicability to Model 727 series listed in Boeing Alert SB 727-53A0199 and the technical requirements of FAA AD 91-07-11) is adopted rather than altered."},"complexity_factors":["Cross-reference to external normative documents: FAA AD 91-07-11 and Boeing Alert SB 727-53A0199 contain the technical requirements (details not reproduced here).","Safety-critical technical work (inspections/repairs) requires specialised maintenance actions and possible parts/workshop time.","Limited applicability to listed Model 727 series aircraft—determining applicability requires consulting the Boeing Alert SB list.","Timing change: revised effective date for Australian aircraft (13 June 1991) alters implementation schedule relative to FAA.","Compliance and enforcement responsibility falls on operators and CASA, creating administrative and cost obligations for operators."],"plain_english_summary":"This Airworthiness Directive requires operators of the specified Boeing 727 series aeroplanes to carry out the technical actions set out in FAA AD 91-07-11 (amdt 39-6946) and the referenced Boeing Alert Service Bulletin to inspect and, if required, repair cracks in the No. 2 cargo doorway frames. It affects operators of the listed 727s, who must meet the compliance schedule (effective 13 June 1991 for Australian aircraft) to address a risk of frame failure and aircraft depressurisation."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-132-number-two-cargo-doorway-frames","history":"/api/acts/ad-b727-132-number-two-cargo-doorway-frames/history","analysis":"/api/acts/ad-b727-132-number-two-cargo-doorway-frames/analysis","conflicts":"/api/acts/ad-b727-132-number-two-cargo-doorway-frames/conflicts","importantCases":"/api/acts/ad-b727-132-number-two-cargo-doorway-frames/important-cases","documents":"/api/acts/ad-b727-132-number-two-cargo-doorway-frames/documents"}}