{"id":"F2006B10997","name":"AD/JT8D/7 - Fuel Manifold \"B\" Nuts - Torqueing Requirements","slug":"ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":56588,"registerId":"commonwealth-F2006B10997-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/JT8D/7 - Fuel Manifold \"B\" Nuts - Torqueing Requirements","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/7 Fuel Manifold \"B\" Nuts - Torqueing Requirements 3/77\n\nApplicability: All Pratt & Whitney Aircraft JT8D model engines containing P/Ns 629141, 629148, 629154, 629155, 735780 and 735781 fuel manifolds with \"B\" nuts which have not been retorqued in service.\n\n \n\nDocument: 1. FAA AD 75-05-06, Amendment 39-2099 as amended by Amendment 39-2064 and\n\n39-2814; or\n\n \n\n2. AD/PW-T/34A.\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","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"Based on the supplied text, the AD's scope is limited to JT8D engines containing the listed fuel manifold part numbers whose \"B\" nuts have not been retorqued in service. The document references external Requirement Documents for the required procedures. There is no information in the supplied text indicating that the scope has been broadened or narrowed from an earlier intent; therefore no change in scope is evident from the provided extract."},"complexity_factors":["Reference to external Requirement Documents (FAA AD and AD/PW-T/34A) rather than containing full procedures in the AD text","Need to identify affected engines and specific part numbers in maintenance records","Operational scheduling and downtime implications for operators to perform retorquing","Potential follow-up actions if retorquing reveals damaged components or non-conformance"],"plain_english_summary":"This AD mandates in‑service retorquing of the \"B\" nuts on specified Pratt & Whitney JT8D fuel manifolds where that work hasn’t already been done. It applies to operators and maintenance organisations responsible for affected engines and requires following the procedures and intervals in the referenced Requirement Document (FAA or local AD). The practical effect is additional maintenance, downtime and cost borne by operators to meet the mandatory retorque and any follow‑on repairs."},"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 issue with specific engine models. It has not expanded beyond its original purpose of addressing fuel manifold B-nut torque requirements."},"complexity_factors":["Very short document (under 200 words of substantive content)","Only 6 specific part numbers to identify","Single condition for applicability (whether nuts have been retorqued)","No defined terms section — uses standard aviation terminology","Compliance achieved by reference to external technical documents rather than detailed procedural rules within the instrument itself","No nested exceptions or conditional logic"],"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) under the Civil Aviation Regulations 1998.\n\n**What it does:** It requires specific maintenance action on Pratt & Whitney JT8D jet engines. Specifically, operators must check and properly tighten (\"retorque\") certain fuel manifold fittings called \"B\" nuts on particular part numbers. These nuts can loosen over time, which risks fuel leaks and potential engine fires.\n\n**Who it affects:** Anyone operating aircraft with Pratt & Whitney JT8D engines that contain the listed fuel manifold part numbers (P/Ns 629141, 629148, 629154, 629155, 735780, and 735781), **unless** those nuts have already been retorqued during previous maintenance.\n\n**Why it matters:** Fuel leaks near hot turbine engines are a serious fire hazard. This directive prevents accidents by ensuring critical fuel connections stay tight. Compliance is mandatory — you cannot legally fly the aircraft without doing this work or proving it's already been done.\n\n**How to comply:** Follow the technical instructions in either:\n- The original US Federal Aviation Administration (FAA) directive (AD 75-05-06 with amendments), or\n- The Australian equivalent directive AD/PW-T/34A"}},"importantCases":[],"_links":{"self":"/api/acts/ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements","history":"/api/acts/ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements/history","analysis":"/api/acts/ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements/analysis","conflicts":"/api/acts/ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements/conflicts","importantCases":"/api/acts/ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements/important-cases","documents":"/api/acts/ad-jt8d-7-fuel-manifold-b-nuts-torqueing-requirements/documents"}}