{"id":"F2006B06866","name":"AD/SD3-60/22 Amdt 1 - Horizontal Stabilizer Spar Webs","slug":"ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114745,"registerId":"commonwealth-F2006B06866-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-60/22 Amdt 1 - Horizontal Stabilizer Spar Webs","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)  \nShort SD3-60 Series Aeroplanes\n\nAD/SD3-60/22\n\nAmdt 1\n\n  \nHorizontal Stabilizer Spar Webs 13/87\n\nApplicability: All models SD3-60 aircraft with S/Nos SH 3601 through SH 3679 inclusive which have exceeded 8000 flights, and all models SD3-60 aircraft with S/Nos SH 3680 through SH 3691 inclusive and SH 3694 which have exceeded 12000 flights.\n\nRequirement: Action in accordance with Shorts SB SD360-55-11 Rev 3\\. Compliance: Unless already accomplished:\n\nPart A: For aircraft with S/Nos SH 3601 through SH 3679; at the next scheduled inspection for Maintenance Release issue after 31 December 1987, and thereafter at intervals not exceeding 1000 flights, until modified in accordance with Shorts SB SD360-55-12 Rev 2.\n\nNote: Aircraft referenced in Part A which have only used a 15 degree take-off flap configuration during their first 5000 flights may utilize the Part B compliance.\n\nPart B: For aircraft with S/Nos SH 3680 through SH 3691 and SH 3694; at the next scheduled inspection for Maintenance Release issue after 31 December 1987, and thereafter at intervals not exceeding 1500 flights, until modified in accordance with Shorts SB SD360-55-12 Rev 2.\n\nBackground: This Amendment updates the Compliance as a result of additional testing by the manufacturer.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":4,"scope_assessment":{"changed":false,"description":"This is a standard amendment to an existing Airworthiness Directive. The amendment narrows the scope slightly by relaxing inspection intervals based on new manufacturer testing, but does not expand beyond the original safety purpose of ensuring horizontal stabilizer structural integrity."},"complexity_factors":["Multiple serial number ranges with different flight-hour thresholds (8000 vs 12000 flights)","Cross-reference to external manufacturer documents (Shorts SB SD360-55-11 Rev 3 and SB SD360-55-12 Rev 2) that are not reproduced in the directive","Conditional exception allowing Part A aircraft to use Part B schedule based on historical flap configuration usage","Nested compliance structure: initial inspection deadline + recurring intervals + termination condition (modification)","Specific date-based trigger (31 December 1987) for first inspection"],"plain_english_summary":"This AD requires owners/operators of Short SD3-60 series aeroplanes to inspect the horizontal stabilizer spar webs at the next check and then periodically (more frequently for earlier serial-numbered/higher-utilisation aircraft) until the manufacturer’s permanent modification is installed. It affects specific serial-number ranges once they exceed set flight counts, with a limited exception for aircraft using a 15° take-off flap setting early in life. The amendment relaxes intervals after manufacturer testing."},"flash_summary":{"complexity_score":4,"scope_assessment":{"changed":true,"description":"The amendment updates compliance requirements: it specifies differentiated inspection frequencies and an operational-history exception, based on additional manufacturer testing. It does not enlarge the listed serial-number applicability but changes the required inspection cadence and conditions that apply until the modification in Shorts SB SD360-55-12 Rev 2 is installed."},"complexity_factors":["Multiple applicability thresholds: serial-number ranges combined with flight-count thresholds (8000 vs 12000 flights).","Different recurring inspection intervals for two aircraft groups (1000 flights vs 1500 flights).","Conditional alternate compliance for aircraft that used a 15° take-off flap during their first 5000 flights (Note).","Compliance trigger tied to the \"next scheduled inspection for Maintenance Release issue after 31 December 1987\" (a date-based starting point).","Cross-references to specific manufacturer service bulletins (Shorts SB SD360-55-11 Rev 3 for inspection procedure; SB SD360-55-12 Rev 2 for modification).","Ongoing obligation 'until modified' requires operators to track flights and confirm completion of the modifying SB to cease inspections."],"plain_english_summary":"This Airworthiness Directive requires repeated inspections of the horizontal stabilizer spar webs on specified Short SD3‑60 aircraft serial numbers until a specified modification is fitted. Affected operators must inspect at the next Maintenance Release after 31 Dec 1987 and then every 1,000 or 1,500 flights (depending on serial range and some operational history) until modified per the manufacturer’s service bulletin. The amendment changes those inspection intervals based on additional manufacturer testing; operators bear the inspection costs, scheduling burden, and must follow the cited service bulletins."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs","history":"/api/acts/ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs/history","analysis":"/api/acts/ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs/analysis","conflicts":"/api/acts/ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs/conflicts","importantCases":"/api/acts/ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs/important-cases","documents":"/api/acts/ad-sd3-60-22-amdt-1-horizontal-stabilizer-spar-webs/documents"}}