{"id":"F2006B03517","name":"AD/BAe 146/7 Amdt 1 - Rear Fuselage Lap Joints - Redux Bonding","slug":"ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":43083,"registerId":"commonwealth-F2006B03517-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/BAe 146/7 Amdt 1 - Rear Fuselage Lap Joints - Redux Bonding","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)  British Aerospace BAe 146 Series Aeroplanes\n\n \n\nAD/BAe 146/7\n\nAmdt 1\n\n\nRear Fuselage Lap Joints - Redux Bonding 11/88\n\n \n\nApplicability: As listed in the Requirement Document.\n\n \n\nRequirement: Action in accordance with British Aerospace SB 53-70 Revision 1. Compliance:  In accordance with the Requirement Document.\n\nBackground: Unsatisfactory Redux bonding may render lengths of lap joint reinforcing ineffective and lead to cracking of the rear fuselage skin at lap joint rivet holes. Amendment 1 requires action in accordance with Revision 1 of British Aerospace SB 53-70.\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":4,"scope_assessment":{"changed":true,"description":"Amendment 1 updates AD/BAe 146/7 to require action in accordance with Revision 1 of British Aerospace SB 53-70. The AD’s applicability and compliance mechanics remain governed by the separate Requirement Document, but the substantive technical requirement is shifted to the revised service bulletin (as stated: 'Amendment 1 requires action in accordance with Revision 1 of British Aerospace SB 53-70')."},"complexity_factors":["Delegation to external technical documents: the AD requires action 'in accordance with British Aerospace SB 53-70 Revision 1', so technical details are outside the AD text.","Applicability and compliance are defined in a separate 'Requirement Document' rather than in the AD itself, requiring cross-referencing.","Technical subject matter (redux bonding, lap joint reinforcing, fuselage skin cracking) requires specialist maintenance/engineering knowledge to implement.","The instrument is an amendment (Amdt 1), so understanding the change requires knowledge of the prior AD/version it modifies.","Short, directive style of the AD leaves procedural, timing and cost details to referenced documents, increasing the administrative steps to determine exact obligations."],"plain_english_summary":"This Airworthiness Directive mandates that operators of BAe 146 aeroplanes listed in the Requirement Document must carry out the actions in British Aerospace Service Bulletin SB 53-70 Revision 1 to address unsatisfactory redux bonding in rear fuselage lap joints. It’s a mandatory CASA requirement under the Civil Aviation Regulations; the Requirement Document and service bulletin contain the technical inspection, repair and timing details needed to mitigate potential skin cracking."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard Airworthiness Directive maintaining its original scope. Amendment 1 simply updates the referenced technical document to Revision 1 of the Service Bulletin, without expanding the directive's coverage beyond the specific structural issue (rear fuselage lap joints) and aircraft type (BAe 146 series) originally targeted."},"complexity_factors":["Very short document (approximately 150 words of substantive content)","Only 1 defined term implicitly referenced (the 'Requirement Document' which points to the Service Bulletin)","No nested conditional logic or exceptions","Single cross-reference to external technical document (British Aerospace SB 53-70 Rev 1)","Straightforward command structure: applicability → requirement → compliance → background","No internal definitions section or interpretation clauses"],"plain_english_summary":"**What this is:** This is an **Airworthiness Directive (AD)** — essentially a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for specific aircraft.\n\n**What it does:** It requires owners or operators of **British Aerospace BAe 146 series aircraft** to inspect and fix a specific structural problem in the rear fuselage (the back section of the plane's body). The issue involves \"Redux bonding\" — a type of adhesive used to join metal panels together in \"lap joints\" (where two pieces of metal overlap and are bonded/riveted together).\n\n**The safety problem:** Poor Redux bonding can cause reinforcing strips in these lap joints to fail, leading to cracks forming around rivet holes in the rear fuselage skin. This could weaken the aircraft structure.\n\n**What must be done:** Aircraft operators must follow the instructions in **British Aerospace Service Bulletin 53-70, Revision 1** (a technical document from the manufacturer detailing inspection and repair procedures).\n\n**Who it affects:** Airlines, cargo operators, or any entity operating BAe 146 series aircraft in Australia.\n\n**Why it matters:** This is a **mandatory safety action**. Non-compliance means the aircraft cannot legally fly. The amendment (Amendment 1) updates the original directive to reference a newer version of the manufacturer's service bulletin."}},"importantCases":[],"_links":{"self":"/api/acts/ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding","history":"/api/acts/ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding/history","analysis":"/api/acts/ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding/analysis","conflicts":"/api/acts/ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding/conflicts","importantCases":"/api/acts/ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding/important-cases","documents":"/api/acts/ad-bae-146-7-amdt-1-rear-fuselage-lap-joints-redux-bonding/documents"}}