{"id":"F2006B09468","name":"AD/EMB-110/27 Amdt 3 - Fuselage Structure Horizontal Stabiliser Front Attachment","slug":"ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":53942,"registerId":"commonwealth-F2006B09468-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/EMB-110/27 Amdt 3 - Fuselage Structure Horizontal Stabiliser Front Attachment","content":"COMMONWEALTH OF AUSTRALIA (Civil Aviation Regulations 1998), PART 39 \\- 105 CIVIL AVIATION SAFETY AUTHORITY\n\nSCHEDULE OF AIRWORTHINESS DIRECTIVES\n\n![](image.001.png)  \nEmbraer EMB-110 (Bandeirante) Series Aeroplanes\n\nAD/EMB-110/27\n\nAmdt 3\n\nApplicability: All models.\n\n  \n\nFuselage Structure Horizontal Stabiliser Front Attachment\n\n  \n5/95\n\nRequirement: 1. For aircraft S/No’s 110001 to 110386, 110388 to 110397, 110399 to 110401,\n\n110404 to 110408, 110410 to 110412, 110414, 110415 and 110421, modify the\n\nfuselage structure near the Horizontal Stabiliser front attachment points in accordance with Part II of Embraer Service Bulletin 110-53-0019 Revision 6.\n\nNote: Aircraft S/N 110387, 110398, 110402, 110403, 110409, 110413, 110416 to\n\n110420, 110422 and subsequent have a modification equivalent to Requirement 1 incorporated in production.\n\n2. For all aircraft, visually inspect the internal fuselage structure near the Horizontal Stabiliser front attachment fitting for looseness, loose fasteners and cracks. Inspect in accordance with Part 1 of Embraer Service Bulletin 110-53-0019 Revision 6.\n\nNote: Brazilian AD 83-03-03 R6 refers.\n\nCompliance: 1. Modify in accordance with Requirement 1 before 1000 hours time in service after 30 April 1985 or before 27 June 1995, whichever occurs first.\n\n2. For aircraft S/N 110001 to 110386, 110388 to 110397, 110399 to 110401, 110404\n\nto 110408, 110410 to 110412, 110414, 110415 and 110421, initially inspect in accordance with Requirement 2 before 3600 hours time in service after installing the Requirement 1 modification, or before 100 hours time in service after 27 April 1995, whichever occurs later.\n\nFor all other aircraft, initially inspect in accordance with Requirement 2 at the next 6C check after 27 April 1995.\n\nRe-inspect all aircraft at each subsequent 6C check. This Amendment is effective 27 April 1995.\n\nBackground: Reports have been received of cracks and loose rivets in the aft fuselage structure near the horizontal stabiliser front attachment. This Amendment references the latest Brazilian AD and Embraer Service Bulletin Revision.\n\nThe aircraft applicability is also clarified. A final calendar date has been added to the compliance for the modification. The inspection requirement for unmodified aircraft has been deleted since they have to be modified before two months have elapsed after the issue date of this Amendment.","sortOrder":0}],"analysis":{"flash_summary_failed":{"failed":true,"reason":"Unauthenticated. Configure AI_GATEWAY_API_KEY or use a provider module. Learn more: https://ai-sdk.dev/unauthenticated-ai-gateway","source":"analysis-cron"},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is Amendment 3 to an existing Airworthiness Directive. The background section indicates the amendment serves to update references to the latest Brazilian AD and Embraer Service Bulletin, clarify aircraft applicability, add a final calendar date for modification compliance, and remove an obsolete inspection requirement for unmodified aircraft. These are refinements and clarifications within the original safety purpose (addressing horizontal stabiliser attachment structural integrity), not an expansion into new regulatory territory."},"complexity_factors":["Multiple serial number ranges with gaps (e.g., 110001-110386, then 110388-110397, excluding specific numbers like 110387, 110398, etc.) requiring careful cross-referencing","Dual compliance pathways: different deadlines for modified vs unmodified aircraft, and different inspection schedules based on production status","Cross-references to external documents: Embraer Service Bulletin 110-53-0019 Revision 6 and Brazilian AD 83-03-03 R6 (compliance requires obtaining manufacturer documents)","Time-based compliance using technical aviation terms ('time in service', '6C check') that assume operational knowledge","Nested conditional logic: 'whichever occurs first/last' clauses creating calculation requirements for operators","Amendment structure references previous versions and explains what changed from Amendment 2, requiring historical context to fully understand current obligations"],"plain_english_summary":"This AD requires operators of Embraer EMB-110 Bandeirante aircraft to address a structural weakness in the rear fuselage at the horizontal‑tail attachment that has produced cracks and loose rivets. It mandates specific strengthening for affected serial-numbered aircraft and regular inspections for all EMB‑110s, ongoing at major maintenance intervals.  \n\nThe measure prevents possible in‑flight loss of control by ensuring vulnerable airframes are reinforced and monitored."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The Amendment clarifies which serial numbers must be modified, adds a final calendar date for the modification compliance, and removes the separate inspection requirement for unmodified aircraft because those aircraft must be modified within the stated period (Background; Compliance)."},"complexity_factors":["Serial-number specific applicability creates a need to track individual airframe S/Ns and their modification status (Requirement 1; Note).","Work references an external technical document — Embraer Service Bulletin 110‑53‑0019 Revision 6 — requiring access to, and implementation of, manufacturer procedures (Requirement 1 and 2).","Multiple, tiered compliance deadlines: a modification deadline expressed in flight hours or a calendar cutoff (1000 hours after 30 Apr 1985 or before 27 Jun 1995) and inspection timing tied to installation or to the next 6C check (Compliance).","Different initial inspection triggers depending on whether the modification has been installed and on serial-number groupings, plus recurring inspections at each 6C check (Compliance).","Some aircraft are noted as already having an equivalent modification in production, creating selective exemption and verification tasks (Note).","Operational burden: scheduling a structural modification versus recurring inspections affects maintenance planning, downtime and cost allocation (Requirement 1; Compliance).","Regulatory cross-reference to a foreign AD (Brazilian AD 83‑03‑03 R6) adds an external compliance source to reconcile (Note)."],"plain_english_summary":"This Airworthiness Directive requires operators of Embraer EMB‑110 series aeroplanes to modify the fuselage near the horizontal stabiliser front attachment for specified serial numbers and to carry out visual inspections of that internal structure on all aircraft, using Embraer Service Bulletin 110‑53‑0019 Revision 6. The measure responds to reported cracks and loose rivets and sets firm compliance deadlines and recurring inspection intervals (tied to 6C checks), so operators must schedule the retrofit and ongoing inspections into maintenance programs."}},"importantCases":[],"_links":{"self":"/api/acts/ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment","history":"/api/acts/ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment/history","analysis":"/api/acts/ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment/analysis","conflicts":"/api/acts/ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment/conflicts","importantCases":"/api/acts/ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment/important-cases","documents":"/api/acts/ad-emb-110-27-amdt-3-fuselage-structure-horizontal-stabiliser-front-attachment/documents"}}