{"id":"F2005L03918","name":"AD/B727/200 - Forward Cargo Door Cutout Frames","slug":"ad-b727-200-forward-cargo-door-cutout-frames","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":39729,"registerId":"commonwealth-F2005L03918-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Boeing 727 Series Aeroplanes","sectionType":"division","heading":"Boeing 727 Series Aeroplanes","content":"### Boeing 727 Series Aeroplanes\n\n| AD/B727/200 | Forward Cargo Door Cutout Frames | 1/2006 |\n| ----------- | -------------------------------- | ------ |\n\n| Applicability: | Model 727, 727C, 727-100, and 727-100C series aircraft, line numbers 1 through 694.                                                                                                                                                                                                                                                                                |\n| -------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------ |\n| Requirement:   | Action in accordance with the technical requirements of FAA AD 2005-20-33Amdt 39-14330.Note: Boeing Alert Service Bulletin 727-53A0229 original issue, or later FAA approved revision, refers.                                                                                                                                                                     |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of19 January 2005.                                                                                                                                                                                                                                                                         |\n|                | This Airworthiness Directive becomes effective on 19 January 2006.                                                                                                                                                                                                                                                                                                 |\n| Background:    | The manufacturer received 42 reports of cracked frames by 20 operators on 29 aircraft. Of the 42 cracks found, 20 were located on the forward frame and 22 on the aft frame of the forward cargo door cutout. Undetected fatigue cracking on the frames of the forward cargo door cutout could result in loss of the door and rapid decompression of the aircraft. |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n28 November 2005","sortOrder":0},{"sectionNumber":"AD/B727/200","sectionType":"part","heading":"AD/B727/200","content":"## AD/B727/200","sortOrder":1},{"sectionNumber":"Forward Cargo Door Cutout Frames","sectionType":"part","heading":"Forward Cargo Door Cutout Frames","content":"## Forward Cargo Door Cutout Frames","sortOrder":2},{"sectionNumber":"1/2006","sectionType":"part","heading":"1/2006","content":"## 1/2006","sortOrder":3}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This AD aligns Australian requirements with the referenced FAA airworthiness directive and Boeing service bulletin to address detected fatigue cracking in the forward cargo door cutout frames. It does not broaden the set of affected aircraft beyond the specified models/line numbers, nor does it add new types of actions beyond inspection and corrective repair mandated by the FAA/Boeing documents. The only notable change from the source material is an administrative effective date for Australia; there is no substantive expansion of scope in the instrument as presented."},"complexity_factors":["Short, single‑issue AD focused on forward cargo door cutout frames","Primary action is to follow an external FAA AD (2005‑20‑33) and Boeing Alert Service Bulletin 727‑53A0229 (cross‑reference dependency)","Limited applicability (specific models and line numbers 1–694)","No multiple nested exceptions or conditional carve‑outs in the text provided","Minor ambiguity in effective date references (revised effective date 19 Jan 2005; Australian AD effective 19 Jan 2006) which may require administrative clarification"],"plain_english_summary":"**What this instrument does**\n\n- This is an airworthiness directive for Boeing 727 series aeroplanes (Models 727, 727C, 727‑100 and 727‑100C, line numbers 1–694). (Applicability)\n- It requires operators to carry out the inspections and any repairs exactly as set out in FAA AD 2005‑20‑33 (amendment 39‑14330) and the Boeing Alert Service Bulletin 727‑53A0229 (or any later FAA‑approved revision). (Requirement)\n- The directive sets an effective date and compliance timetable: it references a revised effective date of 19 January 2005 for the technical requirement and states the Australian AD becomes effective 19 January 2006. (Compliance)\n\n**Who this affects**\n\n- Aircraft owners and operators of the listed Boeing 727 series aircraft (private operators, airlines, cargo operators).\n- Maintenance organisations (MROs) and engineers who perform inspections and repairs under approved procedures.\n- The Civil Aviation Safety Authority (CASA) and its authorised delegates who enforce compliance. (Requirement / Compliance)\n\n**Why it matters (safety rationale and consequence)**\n\n- The manufacturer reported 42 cracked frames on 29 aircraft, with cracks found on both the forward and aft frames around the forward cargo door cutout. (Background)\n- Undetected fatigue cracking on these frames could lead to loss of the forward cargo door and rapid cabin decompression. The AD therefore mandates inspection/repair to prevent that outcome. (Background)\n\n**How it works, mechanically**\n\n- Operators must follow the technical steps in the FAA AD and Boeing service bulletin: inspect the forward cargo door cutout frames for fatigue cracking, and repair or replace components as prescribed if cracks are found. (Requirement)\n- Compliance is recorded and enforced under Australian airworthiness rules; CASA (through its delegate) publishes the AD and sets the effective date for Australian operators. (Compliance)\n\n**Practical consequences, costs and incentives**\n\n- Who pays: the aircraft owners/operators pay for inspections, engineering time, parts and any repairs or replacements. (Requirement / Compliance)\n- Business incentives: operators must decide whether to invest in inspections/repairs, schedule aircraft downtime, or remove older 727s from service if repair costs or downtime are uneconomic. This creates a direct operating‑cost and asset‑management decision for operators.\n- Implementation risks and trade‑offs: parts availability and the capacity of qualified MROs for older 727 models may limit how quickly work can be done, increasing aircraft downtime. The AD does not itself provide parts or funding. (Requirement)\n- Compliance burden: the AD cross‑references FAA material; operators must obtain and follow that external document (and any FAA‑approved revisions). That imposes procedural steps to ensure the correct revision is used and recorded. (Requirement)\n\n**Effects on competition and market choices**\n\n- The AD raises operating costs specifically for operators of affected older 727s. Competing operators with newer aircraft are unaffected by this cost. That can shift economic incentives away from continued use of older 727s, potentially accelerating their retirement or substitution with other aircraft types.\n- Independent MROs that are qualified to work on 727s can capture work from operators; if certified capacity is limited, larger MROs or OEM‑authorised shops may have an advantage. (Requirement)\n\n**Source references in the instrument**\n\n- Applicability: lists models and line numbers. (Applicability)\n- Requirement: directs compliance with FAA AD 2005‑20‑33 and Boeing Alert Service Bulletin 727‑53A0229. (Requirement)\n- Compliance/effective dates: notes revised effective date and Australian effective date. (Compliance)\n- Background: reports of 42 cracked frames on 29 aircraft and the safety consequence (loss of door, rapid decompression). (Background)\n\nOverall, the AD mechanically mandates inspection and corrective action to address fatigue cracking on the forward cargo door cutout frames of specified Boeing 727 aircraft; operators bear the direct cost and scheduling burden, and the rule relies on external FAA/Boeing technical documents for the inspection/repair procedures."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive targeting a specific structural defect in a specific aircraft type. The scope remains tightly focused on the original safety concern (fatigue cracking in forward cargo door frames) and has not expanded beyond this technical maintenance requirement."},"complexity_factors":["Very short document (approximately 200 words of substantive content)","Only 4 defined elements: applicability (aircraft models), requirement (reference to external FAA document), compliance date, and background","No nested conditional logic or exceptions — the requirement applies uniformly to all listed aircraft","Single cross-reference to external technical document (FAA AD 2005-20-33) rather than internal legislative cross-referencing","No interpretation section or defined terms within the instrument itself"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order for aircraft. It requires owners and operators of specific Boeing 727 aircraft to inspect and repair the metal frames surrounding the forward cargo door.\n\n**Why this matters:**\nThe manufacturer found **42 cracks** in these frames across 29 aircraft. If these cracks go undetected, the cargo door could fail in flight, causing **rapid decompression** — a serious safety hazard where the cabin suddenly loses pressure.\n\n**Who must comply:**\n- Owners and operators of Boeing 727, 727C, 727-100, and 727-100C series aircraft\n- Specifically aircraft with \"line numbers\" (manufacturing serial numbers) 1 through 694\n\n**What must be done:**\nOperators must follow the technical instructions in **FAA AD 2005-20-33** (a US safety order) and **Boeing Alert Service Bulletin 727-53A0229**. These documents detail exactly how to inspect the frames and what repairs are needed.\n\n**When:**\nThe directive became effective on **19 January 2006**, though the technical requirements reference an earlier date of 19 January 2005."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-200-forward-cargo-door-cutout-frames","history":"/api/acts/ad-b727-200-forward-cargo-door-cutout-frames/history","analysis":"/api/acts/ad-b727-200-forward-cargo-door-cutout-frames/analysis","conflicts":"/api/acts/ad-b727-200-forward-cargo-door-cutout-frames/conflicts","importantCases":"/api/acts/ad-b727-200-forward-cargo-door-cutout-frames/important-cases","documents":"/api/acts/ad-b727-200-forward-cargo-door-cutout-frames/documents"}}