{"id":"F2006B10553","name":"AD/HS 748/19 - Supplementary Structural Inspection Document","slug":"ad-hs-748-19-supplementary-structural-inspection-document","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":116369,"registerId":"commonwealth-F2006B10553-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/HS 748/19 - Supplementary Structural Inspection Document","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)  \nBritish Aerospace (Hawker Siddeley) HS 748 Series Aeroplanes\n\nAD/HS 748/19 Supplementary Structural Inspection Document 6/95\n\nApplicability: All HS748 aircraft.\n\nRequirement: Incorporate into the Maintenance Schedule the requirements of the HS748 Supplementary Structural Inspection Document Revision 2 with the following exceptions and additions:\n\n    (i) A high frequency eddy current inspection approved by the Authority shall be used in lieu of the visual method specified in item 57-40-1.\n\n    (ii) When complying with the SSID operators shall ensure the full requirements of the following Service Bulletins (SB) are met:\n\nSB 57/75, SB 57/55, SB 57/34, SB 55/19, SB 53/49.\n\n    (iii) The inspection intervals and associated inspection procedures of SB 52-101 shall be observed when complying with item 52-30-1.\n\nNote: CAA(UK) AD 010-09-85 and British Aerospace Alert Service Bulletin 12/11 Revision 1 refer.\n\nCompliance: Effective 25 May 1995.\n\nBackground: The Supplementary Structural Inspection Document has been produced as part of a programme to ensure the continuing airworthiness of high time HS748 aircraft.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD applies to all HS748 aircraft and adopts SSID Revision 2 while specifying inspection-method substitutions and requiring particular Service Bulletins. It changes how inspections are done and what procedures must be followed but does not expand or narrow the population of affected aircraft (Applicability; Requirement)."},"complexity_factors":["Cross-reference to external technical documents: SSID Revision 2, multiple Service Bulletins, and CAA(UK) AD/Alert SB (Note; Requirement).","Specific technical substitution: requirement to use an Authority‑approved high‑frequency eddy‑current inspection instead of a visual method (Requirement (i)).","Obligation to meet full content of listed Service Bulletins, not just individual checks—creates coordination between operator and manufacturer guidance (Requirement (ii)).","Mapping of inspection intervals/procedures to a separate Service Bulletin (SB 52-101) for one item, adding procedural linkage (Requirement (iii)).","Administrative action: mandatory incorporation into each operator's maintenance schedule and ongoing compliance tracking (Requirement; Applicability).","Fixed compliance date imposes a clear deadline for implementation, affecting planning and resource allocation (Compliance)."],"plain_english_summary":"This airworthiness directive requires HS748 operators to add the HS748 Supplementary Structural Inspection Document (Revision 2) to their maintenance schedules and carry out its inspection procedures to maintain continuing airworthiness. It substitutes an Authority‑approved high‑frequency eddy‑current check for a specified visual inspection and mandates compliance with certain manufacturer service bulletins; operators therefore face inspection, record‑keeping and possible repair costs and must obtain Authority approvals where an alternative method is used (Requirement; Compliance)."},"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a single, focused Airworthiness Directive with a clear, narrow purpose: mandating specific structural inspections for one aircraft type. It has not expanded beyond its original safety intent."},"complexity_factors":["Heavy reliance on external documents: The directive references the 'HS748 Supplementary Structural Inspection Document Revision 2' and five separate Service Bulletins without reproducing their content, requiring operators to cross-reference multiple external sources","Technical aviation terminology throughout (e.g., 'high frequency eddy current inspection', 'item 57-40-1', 'SSID')","Conditional modifications: Three specific exceptions/additions that modify the base document requirements","Nested references: References to UK CAA AD 010-09-85 and British Aerospace Alert Service Bulletin 12/11 Revision 1 in the Note section, creating a chain of regulatory dependencies","Precise item numbering system (e.g., 57-40-1, 52-30-1) that assumes familiarity with aircraft maintenance documentation conventions"],"plain_english_summary":"This Airworthiness Directive requires all Australian operators of HS 748 aircraft to add enhanced structural inspections to their maintenance programs to detect cracks, corrosion and fatigue before they become dangerous. It replaces some visual checks with high-frequency eddy-current (HFEC) inspections and mandates compliance with five manufacturer service bulletins, with timing/procedures for a key task per Service Bulletin 52-101.\n\nIt targets aging, high-flight-hour HS 748s and aims to prevent catastrophic structural failures from undetected metal fatigue."}},"importantCases":[],"_links":{"self":"/api/acts/ad-hs-748-19-supplementary-structural-inspection-document","history":"/api/acts/ad-hs-748-19-supplementary-structural-inspection-document/history","analysis":"/api/acts/ad-hs-748-19-supplementary-structural-inspection-document/analysis","conflicts":"/api/acts/ad-hs-748-19-supplementary-structural-inspection-document/conflicts","importantCases":"/api/acts/ad-hs-748-19-supplementary-structural-inspection-document/important-cases","documents":"/api/acts/ad-hs-748-19-supplementary-structural-inspection-document/documents"}}