{"id":"F2006B02802","name":"AD/B727/98 - Main Cargo Door Skin - Inspection and Modification","slug":"ad-b727-98-main-cargo-door-skin-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42144,"registerId":"commonwealth-F2006B02802-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/98 - Main Cargo Door Skin - 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/B727/98 Main Cargo Door Skin - Inspection and Modification\n\n\n1/84\n\n \n\nApplicability: All model 727-100 series aircraft with main cargo door of Boeing manufacture. Document:               Boeing SB 727-52-79, Revision 5.\n\nCompliance: As detailed in requirement document.\n\n \n\nBackground: Cargo door skin cracks have been found on aircraft in service, and have been assessed as a Safety of Flight item.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive addressing a specific airworthiness issue (cargo door skin cracks) on a specific aircraft type. It has not expanded beyond its original technical safety purpose."},"complexity_factors":["Very short document (approximately 150 words)","Only 1 defined applicability criterion (model 727-100 series with Boeing main cargo door)","Single external reference to Boeing Service Bulletin (no internal definitions or cross-references)","No conditional logic, exceptions, or nested provisions","Straightforward command structure: identify affected aircraft → follow manufacturer document → comply by specified dates"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA). It applies to **Boeing 727-100 series aircraft** that have a main cargo door made by Boeing.\n\n**What it requires:**\n- Operators must **inspect and modify the main cargo door skin** on affected aircraft\n- The exact steps are found in **Boeing Service Bulletin 727-52-79, Revision 5** (a technical document from the manufacturer)\n- Compliance deadlines follow that service bulletin\n\n**Why it exists:**\n- Cracks have been discovered in the cargo door skin of these aircraft during normal operations\n- CASA has classified this as a **\"Safety of Flight\" issue** — meaning it could endanger the aircraft if not fixed\n\n**Who must comply:**\n- Anyone operating a Boeing 727-100 with a Boeing-made main cargo door (typically cargo operators, as many 727s were converted to freighters)\n\n**Bottom line:** If you fly one of these planes, you must check the cargo door for cracks and make specific repairs/modifications according to Boeing's instructions. This is not optional — it's legally enforceable under the Civil Aviation Regulations."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The provided text gives no indication that the directive's scope has been altered from its original intent. The AD applies to all Boeing-manufactured main cargo doors on 727-100 series aircraft (Applicability), directs compliance to a specified Boeing service bulletin (Document, Compliance), and cites cargo door skin cracks assessed as a Safety of Flight item as the reason for action (Background). The instrument does not indicate any expansions or contractions of scope beyond those statements."},"complexity_factors":["References an external technical document (Boeing SB 727-52-79, Revision 5) rather than containing technical steps itself (Document, Compliance)","Narrow applicability (limited to 727-100 series with Boeing-manufactured main cargo door) reduces breadth (Applicability)","Safety-critical technical content implied (inspection and modification) but not described in the AD text (Background, Compliance)","Lack of detailed implementation, timing, cost, or alternative-compliance provisions in the AD text increases reliance on external material (Compliance)","Clear issuing authority and purpose reduce legal ambiguity (header, Background)"],"plain_english_summary":"This CASA Airworthiness Directive requires operators of Boeing 727‑100 aircraft with Boeing main cargo doors to carry out inspections and any mandated modifications to the cargo‑door skin, as specified in Boeing Service Bulletin 727‑52‑79 Revision 5. It responds to in‑service cargo‑door skin cracks assessed as a safety‑of‑flight issue. The AD directs compliance to the Boeing document but does not allocate costs, quantify burdens, or specify alternative compliance paths."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-98-main-cargo-door-skin-inspection-and-modification","history":"/api/acts/ad-b727-98-main-cargo-door-skin-inspection-and-modification/history","analysis":"/api/acts/ad-b727-98-main-cargo-door-skin-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b727-98-main-cargo-door-skin-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b727-98-main-cargo-door-skin-inspection-and-modification/important-cases","documents":"/api/acts/ad-b727-98-main-cargo-door-skin-inspection-and-modification/documents"}}