{"id":"F2006B02765","name":"AD/B727/62 - Elevator Aft Control Quadrant - Modification","slug":"ad-b727-62-elevator-aft-control-quadrant-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42107,"registerId":"commonwealth-F2006B02765-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/62 - Elevator Aft Control Quadrant - 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/B727/62 Elevator Aft Control Quadrant - Modification 11/68\n\nApplicability: All models.\n\n \n\nDocument: Boeing ALERT SB No. 27-118, Rev. 1. Compliance: Forthwith.\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":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a discrete, targeted safety directive from 1968 (indicated by '11/68' in the reference). It addresses a specific mechanical component on a specific aircraft type. There is no indication of scope creep; it remains a narrow, technical maintenance requirement."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — relies on external Boeing documentation","Single, unambiguous compliance requirement ('Forthwith')","No conditional logic, exceptions, or nested provisions","Simple applicability clause ('All models')","Cross-reference to only one external document (Boeing Alert SB 27-118 Rev. 1)"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for aircraft.\n\n**What it does:**\n- Requires owners and operators of **Boeing 727 series aircraft** to modify the **elevator aft control quadrant** — a mechanical component in the tail section that helps control the plane's pitch (up and down movement).\n- The modification must follow **Boeing Alert Service Bulletin No. 27-118, Revision 1**.\n\n**Who it affects:**\n- Anyone who owns, operates, or maintains Boeing 727 aircraft in Australia.\n\n**Why it matters:**\n- The \"Alert\" designation and \"Forthwith\" compliance deadline indicate this addresses a **serious safety issue** — likely a defect that could affect flight control. The directive is mandatory and must be completed immediately.\n\n**Key terms explained:**\n- **Airworthiness Directive (AD):** A legally enforceable notice requiring specific maintenance or modifications to keep an aircraft safe to fly.\n- **Elevator aft control quadrant:** A mechanical linkage in the rear of the aircraft that translates pilot control inputs into movement of the elevator (the moving surface that makes the plane climb or descend).\n- **Forthwith:** Immediately — no grace period."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The document contains no indication that the applicability or required action differs from its original wording: it applies to \"All models,\" cites Boeing ALERT SB No. 27-118, Rev. 1, and requires compliance \"Forthwith.\" There is no text in the provided instrument that amends or narrows the scope from what is stated."},"complexity_factors":["Short, single-action directive with no embedded technical detail","Applies to all models (broad applicability but simple scope)","Mandates external document (Boeing ALERT SB No. 27-118, Rev. 1) for technical steps, requiring acquisition and interpretation of that document","\"Forthwith\" timing increases operational complexity in scheduling but does not add legal or procedural layers","Issued under Part 39 (regulatory authority is clear), leaving little room for alternative compliance described in the AD itself"],"plain_english_summary":"What this instrument does\n\n- This is an Airworthiness Directive (AD) issued under the Commonwealth Civil Aviation Regulations, Part 39, titled AD/B727/62 — “Elevator Aft Control Quadrant - Modification.” It appears in the Schedule of Airworthiness Directives.\n- It requires that the modification described in Boeing ALERT Service Bulletin No. 27-118, Revision 1, be carried out on the affected aeroplanes (Document: Boeing ALERT SB No. 27-118, Rev. 1). The AD states the action must be done \"Forthwith\" (Compliance: Forthwith).\n\nWho is affected\n\n- The AD applies to the Boeing 727 series aeroplanes listed as \"All models\" (Applicability: All models). That means every operator of a Boeing 727 in the regulator’s jurisdiction is required to comply.\n\nWhat operators must do, mechanically\n\n- Operators must obtain Boeing ALERT SB No. 27-118, Rev. 1, and carry out the modification to the elevator aft control quadrant described in that service bulletin. The AD sets the compliance timing as \"Forthwith,\" meaning the work is required immediately once the AD is in force.\n\nWhy the regulator issued it (stated purpose and how it’s reflected in the instrument)\n\n- The AD’s title and the reference to the Boeing Alert Service Bulletin identify the subject matter as a modification to the elevator aft control quadrant. The document itself does not include a narrative explanation of the safety issue or technical background; it instead directs operators to Boeing’s alert service bulletin for the modification instructions (Document: Boeing ALERT SB No. 27-118, Rev. 1).\n\nPractical implications, incentives and who pays\n\n- Who pays: Aircraft operators (owners or operators of affected 727s) will bear the direct costs of buying parts and paying for labour to carry out the modification described in the Boeing alert SB (Document: Boeing ALERT SB No. 27-118, Rev. 1).\n- Incentives: Compliance with the AD is mandatory under Part 39. Operators face the operational incentive to comply immediately because the AD sets compliance as \"Forthwith\" (Compliance: Forthwith). The document itself does not specify enforcement penalties or alternative compliance methods.\n\nCompliance burden and operational trade-offs\n\n- Compliance burden: The directive is brief and delegates technical detail to the Boeing alert SB. Operators must locate and follow that external document to perform the work. The AD’s \"Forthwith\" timing creates a scheduling burden: immediate work may require taking aircraft out of service or rearranging operations, producing downtime costs.\n- Trade-offs and opportunity cost: Money and time spent on the modification cannot be used for other maintenance or operational activities during the same period. The AD does not state whether the modification is a one-off action or requires follow-up inspections.\n\nRegulatory discretion and implementation risk\n\n- Discretion: The AD sets a mandatory requirement and points to the Boeing alert SB for the technical steps; it leaves little operational discretion about whether to comply. The AD text does not identify any approved alternatives or delegations allowing operators to adopt different methods.\n- Implementation risk: The AD relies on an external manufacturer document for the technical method. That creates a dependence on obtaining and following the Boeing alert SB correctly. The AD does not include technical detail or alternative compliance procedures in the text provided.\n\nConcrete citations to the source\n\n- Applicability: \"All models.\" (Applicability: All models.)\n- Technical directive reference: \"Boeing ALERT SB No. 27-118, Rev. 1.\" (Document: Boeing ALERT SB No. 27-118, Rev. 1.)\n- Timing: \"Compliance: Forthwith.\" (Compliance: Forthwith.)\n\nSummary statement\n\n- In short: every operator of a Boeing 727 must immediately carry out the elevator aft control quadrant modification specified in Boeing Alert SB 27-118 Rev. 1. Operators pay for and schedule the work; the AD contains the high-level mandate and points to the manufacturer’s service bulletin for the technical instructions."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-62-elevator-aft-control-quadrant-modification","history":"/api/acts/ad-b727-62-elevator-aft-control-quadrant-modification/history","analysis":"/api/acts/ad-b727-62-elevator-aft-control-quadrant-modification/analysis","conflicts":"/api/acts/ad-b727-62-elevator-aft-control-quadrant-modification/conflicts","importantCases":"/api/acts/ad-b727-62-elevator-aft-control-quadrant-modification/important-cases","documents":"/api/acts/ad-b727-62-elevator-aft-control-quadrant-modification/documents"}}