{"id":"F2006B02766","name":"AD/B727/63 - Rudder Pedal Adjustment Crank Assembly - Modification","slug":"ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42108,"registerId":"commonwealth-F2006B02766-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/63 - Rudder Pedal Adjustment Crank Assembly - 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/B727/63 Rudder Pedal Adjustment Crank Assembly - Modification\n\n\n3/69\n\n \n\nApplicability: All models.\n\n \n\nDocument: Boeing SB No. 27-100. 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 discrete, targeted safety directive focused on a specific mechanical component of a specific aircraft type. It has not expanded beyond its original purpose of mandating a safety modification to the rudder pedal assembly."},"complexity_factors":["Extremely short document (under 150 words)","No defined terms section — relies on external technical reference (Boeing SB 27-100)","No conditional logic or nested exceptions","Single, unambiguous compliance requirement ('Forthwith')","Simple applicability clause ('All models')","Cross-reference to only one external technical document"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) under the Civil Aviation Regulations.\n\n**What it does:**\nIt requires owners and operators of **Boeing 727 aircraft** to modify the **rudder pedal adjustment crank assembly** (the mechanical part that lets pilots adjust the position of the rudder pedals for comfort and control).\n\n**Who it affects:**\n- All operators of Boeing 727 series aeroplanes in Australia\n- Maintenance organisations servicing these aircraft\n\n**Why it matters:**\nAirworthiness Directives are legally binding safety instructions. They are issued when a design flaw, manufacturing defect, or wear pattern is discovered that could affect flight safety. \"Compliance: Forthwith\" means this modification must be done **immediately** — not at the next scheduled maintenance check.\n\nThe specific technical details of the required modification are contained in **Boeing Service Bulletin No. 27-100** (referenced in the document). Aircraft cannot legally fly until this modification is completed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD text provides no indication that its scope departs from its apparent purpose. It requires a modification to the rudder pedal adjustment crank assembly for all Boeing 727 models and sets immediate compliance. There is no statement in the supplied text that the AD broadens or narrows scope relative to an earlier instrument or expresses a different intent; therefore no scope change is evident from the source."},"complexity_factors":["Immediate compliance: \"Compliance: Forthwith\" compresses scheduling and raises urgency.","External technical reference: the AD delegates procedural detail to Boeing SB No. 27-100 rather than reproducing instructions, requiring operators to obtain and interpret that document.","Broad applicability: applies to \"All models\" of the Boeing 727 series, increasing the number of affected operators.","Sparse procedural detail in the AD: the directive contains no parts lists, man-hour estimates, or staged compliance options, leaving planning details to operators and the service bulletin.","Regulatory framing: issued under Civil Aviation Regulations 1998 Part 39 and listed in CASA's AD schedule, making it mandatory but with no enforcement particulars in the text."],"plain_english_summary":"This airworthiness directive (AD B727/63) is a mandatory safety instruction issued under the Civil Aviation Regulations 1998, Part 39 and published in the Civil Aviation Safety Authority's Schedule of Airworthiness Directives. It requires a specific modification to the rudder pedal adjustment crank assembly on Boeing 727 series aeroplanes. The directive applies to all Boeing 727 models (see: \"Applicability: All models\") and directs compliance with Boeing Service Bulletin No. 27-100 (see: \"Document: Boeing SB No. 27-100\"). The timing is immediate: operators must comply \"forthwith\" (see: \"Compliance: Forthwith\").\n\nWho this affects and what changes mechanically\n- Affected parties: owners and operators of Boeing 727 series aeroplanes. The AD lists \"All models\" under applicability. (Applicability: All models.)\n- Required action: a modification to the rudder pedal adjustment crank assembly must be performed in accordance with the referenced Boeing service bulletin. (Document: Boeing SB No. 27-100.)\n- Timing: the modification must be carried out immediately; the AD sets compliance as \"forthwith,\" meaning there is no staged grace period. (Compliance: Forthwith.)\n\nWhy it matters (as stated and as implied by the instrument)\n- Stated mechanism: the instrument instructs operators to perform a technical modification identified by the AD title and by reference to Boeing SB No. 27-100. The AD itself does not set out the engineering steps; it points to the Boeing service bulletin for technical instructions. (Title and Document: Boeing SB No. 27-100.)\n- Implied regulatory effect: because this is an AD in CASA's Schedule of Airworthiness Directives under Part 39, compliance is mandatory; failure to comply would leave an aircraft out of conformity with the applicable airworthiness requirements. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105 CIVIL AVIATION SAFETY AUTHORITY; Schedule of Airworthiness Directives.)\n\nCosts, incentives and practical trade-offs\n- Who pays: the immediate compliance requirement assigns the practical responsibility for arranging and carrying out the modification to the aircraft operator/owner. The AD text itself does not state who bears the cost, but operators will need to resource the work (parts, maintenance labour, scheduling). (Applicability: All models; Compliance: Forthwith; Document: Boeing SB No. 27-100.)\n- Compliance burden: because compliance is required \"forthwith,\" operators may face compressed scheduling, short-notice maintenance bookings, and potential aircraft downtime. The AD does not provide a phased schedule or exemptions. (Compliance: Forthwith.)\n- Reliance on a third‑party technical document: the AD delegates technical detail to Boeing SB No. 27-100; operators must obtain and follow that service bulletin to meet the AD. This creates dependence on the content, availability and clarity of the Boeing document. (Document: Boeing SB No. 27-100.)\n- Implementation risk and opportunity cost: immediate modification can divert maintenance resources from other work and may require parts or specialised labour; the AD does not include parts provisioning or cost-sharing arrangements. (Compliance: Forthwith; Document: Boeing SB No. 27-100.)\n\nRegulatory discretion and enforcement\n- Issuer and legal basis: the AD is issued under the Civil Aviation Regulations 1998 and appears in CASA's schedule of ADs; CASA determines mandatory compliance through this mechanism. The AD text itself prescribes the action and timing but does not set out enforcement mechanisms or penalties. (COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 - 105; Schedule of Airworthiness Directives.)\n\nNet operational effect (mechanical facts, not judgement)\n- Operators of Boeing 727 aircraft must arrange for the prescribed modification to the rudder pedal adjustment crank assembly immediately, following the procedures in Boeing SB No. 27-100. The directive narrows what operators must do (modify a specific assembly) and shortens when it must be done (forthwith), while leaving technical execution to the referenced service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification","history":"/api/acts/ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification/history","analysis":"/api/acts/ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification/analysis","conflicts":"/api/acts/ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification/conflicts","importantCases":"/api/acts/ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification/important-cases","documents":"/api/acts/ad-b727-63-rudder-pedal-adjustment-crank-assembly-modification/documents"}}