{"id":"F2006B02772","name":"AD/B727/7 Amdt 1 - Inboard and Outboard Midflap Carriage - Modification","slug":"ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42114,"registerId":"commonwealth-F2006B02772-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/7 Amdt 1 - Inboard and Outboard Midflap Carriage - 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/B727/7\n\nAmdt 1\n\nApplicability: All models.\n\n\nInboard and Outboard Midflap Carriage - Modification\n\n\n2/67\n\n \n\nDocument: Boeing SB No. 27-81. 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","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard, narrow airworthiness directive focused on a specific mechanical modification. It has not expanded beyond its original safety purpose. The amendment (Amdt 1) appears to be a routine update to an existing directive rather than a scope expansion."},"complexity_factors":["Extremely short document (approximately 150 words)","No defined terms section — uses plain technical language","No conditional logic or nested exceptions","Single, unambiguous compliance requirement (follow Boeing SB 27-81)","No cross-references to other legislation beyond the enabling Civil Aviation Regulations 1998","Simple structure: applicability → subject → document reference → compliance deadline"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires aircraft owners or operators to fix a specific safety problem.\n\n**What it does:** It orders modifications to the **midflap carriage** (the structural hardware that holds the middle section of the wing flaps) on **all Boeing 727 aircraft**. The flaps are the movable surfaces on the back of the wings that help planes slow down and land safely. If the carriage that supports these flaps fails, the flaps could malfunction — potentially causing loss of control during landing.\n\n**Who must comply:** Anyone operating a Boeing 727 in Australia (all models are covered).\n\n**What action is required:** Operators must carry out a modification specified in **Boeing Service Bulletin 27-81** — essentially, a repair or upgrade designed by the manufacturer to fix a known defect.\n\n**When:** **\"Forthwith\"** — meaning immediately, without delay. This is urgent.\n\n**Why it matters:** This directive addresses a critical flight safety issue. Flap failures during approach or landing can be catastrophic. The \"Amdt 1\" indicates this is an amended version of an earlier directive, likely tightening or clarifying the original requirements."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The instrument is labelled as Amendment 1 (AD/B727/7 Amdt 1), indicating it amends a prior AD. The supplied text does not include the original AD text or a comparison, so the specific ways the scope or requirements were changed are not stated in the material provided."},"complexity_factors":["Short, prescriptive directive that depends on an external technical document (Boeing SB No. 27-81) for implementation details (Document: Boeing SB No. 27-81).","Immediate compliance requirement increases operational urgency and scheduling complexity for operators (Compliance: Forthwith).","Applies to the entire fleet of the type (all models), widening scope of logistical and parts supply needs (Applicability: All models).","Technical nature of the work (flap carriage modification) requires certified maintenance capability and possibly specialised parts/tooling — these are not described in the AD text, so operators must consult the Service Bulletin (Document: Boeing SB No. 27-81).","Regulatory enforcement and proof of compliance mechanisms are not detailed in the excerpt, requiring operators to rely on standard CASA processes and maintenance-record practices (heading: Civil Aviation Safety Authority; Schedule of Airworthiness Directives)."],"plain_english_summary":"This Airworthiness Directive from CASA requires all Boeing 727 aircraft to have the inboard and outboard midflap carriage modified immediately by following Boeing Service Bulletin No. 27‑81. Owners/operators must arrange and pay for the work without delay; CASA enforces the directive while Boeing supplies the technical procedure, and operators should prioritise scheduling and maintenance records to demonstrate compliance."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification","history":"/api/acts/ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification/history","analysis":"/api/acts/ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification/analysis","conflicts":"/api/acts/ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification/conflicts","importantCases":"/api/acts/ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification/important-cases","documents":"/api/acts/ad-b727-7-amdt-1-inboard-and-outboard-midflap-carriage-modification/documents"}}