{"id":"F2006B02781","name":"AD/B727/78 Amdt 1 - Engine Fuel Feed Forward Shroud Hose Assemblies - Inspection and Modification","slug":"ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":42123,"registerId":"commonwealth-F2006B02781-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/B727/78 Amdt 1 - Engine Fuel Feed Forward Shroud Hose Assemblies - Inspection and 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/B727/78\n\nAmdt 1\n\n\nEngine Fuel Feed Forward Shroud Hose Assemblies - Inspection and Modification\n\n\n5/83\n\n \n\nApplicability: All models listed in Boeing SB No. 727-28-51 Rev. 2. Document:  1. Boeing SB No. 727-28-51, Rev. 2; or\n\n2. FAA AD 77-03-02, Amdt. 39-4572.\n\n \n\nCompliance: As detailed in the requirement documents.\n\n \n\nBackground: This Directive is amended to include the latest revision status of FAA AD 77-03-02 which removes the need of repeat inspection after the installation of corrosion resistant braided hoses. Inspection and modification is required following the discovery by the manufacturer of braid corrosion in hoses constructed with carbon steel braid.\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 amendment remains tightly scoped to its original purpose. It updates technical references and incorporates a relaxation of requirements (removing repeat inspections after modification) without expanding beyond the specific Boeing 727 fuel hose safety issue addressed in the original 1983 directive."},"complexity_factors":["Very short document (approximately 200 words)","Only 2 defined technical references (Boeing SB and FAA AD)","No conditional logic or nested exceptions","Single compliance pathway with alternative reference documents","Straightforward applicability statement referencing external technical standard","No cross-references to other legislation or regulations beyond the parent Civil Aviation Regulations 1998","Simple amendment purpose: updating revision status and removing repeat inspection requirement"],"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 specific maintenance actions on certain aircraft.\n\n**What it does:**\n- **Targets:** Boeing 727 series aeroplanes (all models covered by Boeing Service Bulletin 727-28-51, Revision 2)\n- **Requires:** Inspection and modification of **engine fuel feed forward shroud hose assemblies**\n- **Why:** The manufacturer discovered **braid corrosion** in hoses made with carbon steel braid. This corrosion could compromise fuel system integrity and create safety risks.\n\n**Key change in this amendment:**\n- Updates the directive to reference the latest version of the US Federal Aviation Administration (FAA) directive (AD 77-03-02)\n- **Important benefit:** Once operators install new **corrosion-resistant braided hoses**, they no longer need to keep doing repeat inspections\n\n**Who must comply:**\n- Operators and maintainers of affected Boeing 727 aircraft\n- Must follow the technical instructions in either:\n  - Boeing Service Bulletin 727-28-51, Revision 2; OR\n  - FAA AD 77-03-02, Amendment 39-4572\n\n**Why it matters:** Fuel leaks near engines can cause fires or engine failures. This directive prevents that by ensuring corroded hoses are found and replaced with better-designed parts, while also reducing long-term maintenance burden once the fix is applied."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The Amendment updates the Directive to incorporate the latest revision status of FAA AD 77-03-02. That revision removes the requirement for repeat inspections once corrosion-resistant braided hoses are installed. Mechanically, the amendment narrows ongoing inspection obligations for aircraft where the corrosion-resistant modification is completed while keeping inspection/modification requirements for assemblies with carbon steel braid. (Background; Document)"},"complexity_factors":["Relies on external, technical compliance documents (Boeing SB No. 727-28-51 Rev. 2 and FAA AD 77-03-02 Amdt. 39-4572) rather than setting full procedural detail in the Directive (Document; Compliance).","Applies to multiple airframe models listed only in the referenced Boeing service bulletin, requiring cross-referencing to determine exact affected serials/models (Applicability).","Technical nature of the work (inspection and modification of braided hose assemblies) requires qualified maintenance personnel and approved parts, adding operational complexity (Background; Compliance).","Regulatory linkage to an FAA AD revision alters inspection obligations (removal of repeat inspections after installing corrosion-resistant hoses), creating conditional compliance paths depending on parts installed (Background).","Potential supply-chain and scheduling constraints for procuring corrosion-resistant braided hoses and arranging maintenance slots, which are not addressed in the Directive text (Background; Compliance).","Administrative burden of records and demonstration of compliance tied to external documents increases procedural steps for operators and maintenance organisations (Compliance)."],"plain_english_summary":"This Directive requires operators of specified Boeing 727 models to inspect and, if necessary, modify engine fuel feed forward shroud hose assemblies by following Boeing Service Bulletin 727-28-51 Rev.2 or FAA AD 77-03-02. It affects aircraft owners/operators and maintenance organisations, who bear costs and record-keeping obligations.\n\nInstalling corrosion‑resistant braided hoses removes the need for repeat inspections under the updated FAA AD, creating an economic incentive to modify rather than repeatedly inspect."}},"importantCases":[],"_links":{"self":"/api/acts/ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification","history":"/api/acts/ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification/history","analysis":"/api/acts/ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification/analysis","conflicts":"/api/acts/ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification/conflicts","importantCases":"/api/acts/ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification/important-cases","documents":"/api/acts/ad-b727-78-amdt-1-engine-fuel-feed-forward-shroud-hose-assemblies-inspection-and-modification/documents"}}