{"id":"F2006B10999","name":"AD/JT8D/9 - 2nd Stage Fan Blade Retaining Strap Inspection and Installation of Fan Blade Bumper","slug":"ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56591,"registerId":"commonwealth-F2006B10999-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/9 - 2nd Stage Fan Blade Retaining Strap Inspection and Installation of Fan Blade Bumper","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 - 106 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n \n\n![](image.001.png)  Pratt and Whitney Turbine Engines - JT8D Series\n\n \n\nAD/JT8D/9 2nd Stage Fan Blade Retaining Strap Inspection\n\nand Installation of Fan Blade Bumper\n\nApplicability: JT8D-1, -1A, -1B, -7, -7A and -7B engines. Document:  1. FAA 76-20-02 : Amendment 39-2734; or\n\n2. AD/PW-T/38.\n\n \n\nCompliance: As detailed in the Requirement Document.\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\n10/76\n","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":false,"description":"The provided text sets out an AD that applies to the listed JT8D engine models and delegates the technical requirements to a separate Requirement Document (Document; Applicability; Compliance). The excerpt does not indicate any change to the scope from an earlier or original intent; it simply prescribes inspection and installation actions for those specified engines and points to the detailed Requirement Document for compliance steps."},"complexity_factors":["Delegation of technical detail to external Requirement Document(s) (Document; Compliance).","Technical nature of required work (inspection of retaining straps and retrofit installation) requiring maintenance skills and parts.","Applicability limited to a specific set of engine models, requiring operators to identify covered fleet (Applicability).","Potential operational impact from aircraft downtime while inspections/retrofits are performed.","Need for record-keeping and potential regulator interaction for alternative methods or dispute over compliance timing.","Cross-reference to a FAA AD and a separate AD/PW-T document introduces multi-jurisdictional/document review."],"plain_english_summary":"What this instrument does (mechanically)\n\n- Requires inspection of the 2nd stage fan blade retaining strap and the installation of a fan blade bumper on certain Pratt & Whitney JT8D engines. (See: Applicability; Compliance.)\n- It does not include the technical steps in the AD text itself; instead it directs operators to carry out the work “as detailed in the Requirement Document” and lists two referenced documents for that purpose: FAA 76-20-02 (Amendment 39-2734) or AD/PW-T/38. (See: Document; Compliance.)\n\nWho this affects\n\n- Owners, operators and maintenance organisations responsible for aircraft powered by JT8D-1, -1A, -1B, -7, -7A and -7B engines. They are the parties required to perform the inspections and installations specified by the referenced Requirement Document. (See: Applicability; Compliance.)\n\nWhy the measure is included (stated purpose) and how that maps to costs and incentives\n\n- The title and form of the instrument indicate its purpose: to inspect a specific engine component (2nd stage fan blade retaining strap) and to require a retrofit (installation of a fan blade bumper). That purpose is stated by the instrument itself (title and listed actions). The AD therefore mandates preventive maintenance or modification intended to address a condition identified by the issuer. (See: AD title; Document.)\n- Who pays: the direct costs (labour, parts, and aircraft downtime) fall on the operators or their maintenance providers because the Compliance clause requires operators to do the work per the Requirement Document. (See: Compliance; Applicability.)\n- Incentives and behaviour changes: operators will need to schedule inspections and retrofits for affected engines, which may change maintenance intervals, labour allocation and spares inventory. Compliance may also shift aircraft availability while modification or inspection is carried out. (See: Compliance.)\n\nTrade-offs, implementation risk and compliance burden\n\n- The AD itself is short and delegates the technical detail to external documents. That reduces repetition in the AD text but creates dependency on the referenced Requirement Document(s) for the exact scope, methods, intervals and compliance times. This raises implementation risk if operators do not have immediate access to, or clarity from, the referenced documents. (See: Document; Compliance.)\n- Compliance burden includes: performing technically specific inspections, sourcing and fitting bumpers where required, recording the work in maintenance logs, and potential aircraft downtime. Those burdens are concentrated on the operators of the listed engine models. (See: Applicability; Compliance.)\n- Discretion and enforcement: the AD prescribes compliance but relies on the civil aviation authority to enforce it. Operational discretion (for example, timing within allowable compliance windows) will depend on the Requirement Document and on regulator guidance or approvals for alternative methods of compliance. (See: Compliance; Document.)\n\nConcrete, source-grounded summary\n\n- The instrument applies to the named JT8D engine models and requires inspection of the 2nd stage fan blade retaining strap and installation of a fan blade bumper in accordance with a separate Requirement Document. The technical steps, timing and any allowable alternatives are set out in the referenced documents (FAA AD 76-20-02 amendment 39-2734 or AD/PW-T/38). Operators of the listed engines bear the direct costs and operational consequences of meeting the directive, and regulatory authorities are responsible for monitoring and enforcing compliance. (See: Applicability; Document; Compliance.)"},"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 in specific engine models. It has not expanded beyond its original purpose of addressing a known failure mode in fan blade retention systems."},"complexity_factors":["Very short document — only 2 substantive paragraphs plus metadata","No defined terms section — relies entirely on external referenced documents for technical specifications","Simple conditional structure: applies to specific engine models, compliance by reference to external standard","No nested exceptions or complex logical operators","Cross-references are straightforward pointers to FAA and CASA equivalent documents rather than internal structural dependencies"],"plain_english_summary":"This is an **Airworthiness Directive (AD)** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) that requires specific maintenance actions on certain aircraft engines.\n\n**What it does:**\n- Requires inspection of the **2nd stage fan blade retaining strap** on specific Pratt & Whitney JT8D engines\n- Mandates installation of a **fan blade bumper** (a protective component that prevents damage)\n\n**Who it affects:**\n- Owners and operators of aircraft with **JT8D-1, -1A, -1B, -7, -7A and -7B engines** — these are turbofan engines commonly used on older Boeing 727 and 737 aircraft, plus McDonnell Douglas DC-9 and MD-80 series planes\n- Maintenance organisations servicing these engines\n\n**Why it matters:**\nFan blade retaining straps keep the fan blades properly positioned. If they fail, blades can detach or shift, potentially causing **catastrophic engine damage, fire, or loss of aircraft control**. This AD prevents that by ensuring worn straps are detected and a protective bumper is installed.\n\n**Compliance:**\nOperators must follow the detailed procedures in the referenced FAA document (Federal Aviation Administration directive 76-20-02) or the equivalent Australian document AD/PW-T/38."}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper","history":"/api/acts/ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper/history","analysis":"/api/acts/ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper/analysis","conflicts":"/api/acts/ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper/conflicts","importantCases":"/api/acts/ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper/important-cases","documents":"/api/acts/ad-jt8d-9-2nd-stage-fan-blade-retaining-strap-inspection-and-installation-of-fan-blade-bumper/documents"}}