{"id":"F2006B02688","name":"AD/B727/165 - Upper and Lower Sills of Number 1 Cargo Door","slug":"ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42004,"registerId":"commonwealth-F2006B02688-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/165 - Upper and Lower Sills of Number 1 Cargo Door","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nBoeing 727 Series Aeroplanes\n\nAD/B727/165 Upper and Lower Sills of Number 1 Cargo Door 1/2000\n\nApplicability: All Model 727-200 series aircraft.\n\nRequirement: Action in accordance with the technical requirements of FAA AD 99-23-13 Amdt 39- 11409.\n\nNote: Boeing Service Bulletin 727-53A0219 Revision 1 refers.\n\nCompliance: As specified in the Requirement document for the initial and repetitive inspections, with a revised effective date of 31 December 1999.\n\nThis Airworthiness Directive becomes effective on 31 December 1999.\n\nBackground: The FAA received reports of fatigue cracks in certain structures adjacent to the number 1 cargo door cutout at the forward and aft doorway frames. Such cracking could result in rapid decompression of the fuselage and consequent reduced structural integrity of the aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all Model 727-200 series aircraft and requires action in accordance with FAA AD 99-23-13. The text does not expand or narrow the class of affected aircraft beyond that FAA-based applicability; it adopts the FAA technical requirements and sets an Australian effective date (revised to 31 December 1999). Therefore there is no indication in the supplied text that the regulatory scope was changed from the external FAA requirement it incorporates (\"Applicability\"; \"Requirement\"; \"Compliance\")."},"complexity_factors":["Adopts and references an external technical document (FAA AD 99-23-13) for substantive requirements, creating dependency on another instrument (\"Requirement\").","References a manufacturer service bulletin for technical detail (Boeing Service Bulletin 727-53A0219 Revision 1) (\"Note\").","Requires initial and repetitive inspections with timing and remedial action specified externally (\"Compliance\").","Narrow applicability (all Model 727-200 series) reduces scope complexity (\"Applicability\").","Regulatory interplay between Australian AD and FAA/Manufacturer documents requires operators to consult multiple sources to determine precise actions (header/\"Requirement\")."],"plain_english_summary":"This directive makes FAA AD 99-23-13 mandatory for Australian-registered Boeing 727-200s, requiring operators and maintenance organisations to perform the specified inspections and corrective actions on structures around the No.1 cargo door.  \n\nIt responds to fatigue cracking that could cause rapid decompression and reduced structural integrity; operators bear costs for obtaining the FAA/Boeing documents, recurring inspections, and any repairs or downtime."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive implementing a specific safety inspection requirement. It matches its original intent exactly: addressing a known structural defect in a specific aircraft model."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined applicability (Model 727-200 series)","Single requirement referencing external technical document (FAA AD)","No nested conditions or exceptions","No cross-references to other Australian legislation","Straightforward compliance date structure"],"plain_english_summary":"This is a **safety order for Boeing 727-200 aircraft**.\n\n**What it does:**\n- Requires airlines and aircraft operators to inspect and fix a specific structural problem on the cargo door of Boeing 727-200 planes.\n- The problem involves **fatigue cracks** (tiny cracks that develop over time from repeated stress) in the metal frames around the number 1 cargo door.\n- If left unchecked, these cracks could cause the cabin to suddenly lose pressure (**rapid decompression**) and weaken the aircraft's structure.\n\n**Who it affects:**\n- Anyone who owns or operates a **Boeing 727-200 series aircraft** in Australia.\n- Maintenance crews who must carry out the inspections and repairs.\n\n**What must be done:**\n- Follow the technical instructions in an American aviation safety order (**FAA AD 99-23-13**).\n- Use **Boeing Service Bulletin 727-53A0219 Revision 1** as the repair guide.\n- Complete initial inspections and ongoing checks starting from **31 December 1999**.\n\n**Why it matters:**\n- This prevents potentially catastrophic structural failures. The FAA discovered this cracking problem in the US, and Australia is adopting the same safety standard to protect passengers and crew on Australian-registered aircraft."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door","history":"/api/acts/ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door/history","analysis":"/api/acts/ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door/analysis","conflicts":"/api/acts/ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door/conflicts","importantCases":"/api/acts/ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door/important-cases","documents":"/api/acts/ad-b727-165-upper-and-lower-sills-of-number-1-cargo-door/documents"}}