{"id":"F2007L00307","name":"AD/SC7/13 Amdt 6 - Fatigue Life Limitations","slug":"ad-sc7-13-amdt-6-fatigue-life-limitations","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":68682,"registerId":"commonwealth-F2007L00307-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Short SC7 (Skyvan) Series Aeroplanes","sectionType":"division","heading":"Short SC7 (Skyvan) Series Aeroplanes","content":"### Short SC7 (Skyvan) Series Aeroplanes\n\n| AD/SC7/13 Amdt 6 | Fatigue Life Limitations | 3/2007 |\n| ---------------- | ------------------------ | ------ |\n\n| Applicability: | All Model SC7 Skyvan Series 3, 3A, and 3M aircraft, except serial numbers SH 1845, SH 1847, SH 1883, SH 1889, SH 1943, and SH 1960.                                                                                                                                                                                                                                                                                                                                                                 |\n| -------------- | --------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Action in accordance with the requirements of EASA AD 2007-0013.Note: Shorts Service Bulletin 51-51 Revision 8, or later EASA approved revision, refers.                                                                                                                                                                                                                                                                                                                                            |\n| Compliance:    | As specified in the Requirement document, with a revised effective date of 15 March 2007. For the starboard flap operating levers, part number SC7-45-1766: From the effective date of this Airworthiness Directive, establish the life history status. Where the life is found to be unknown, or above the life limit specified in SB 51-51 Revision 8, or later EASA approved revision; affected parts must be replaced within 3 months after the effective date of this Airworthiness Directive. |\n|                | This Amendment becomes effective on 15 March 2007.                                                                                                                                                                                                                                                                                                                                                                                                                                                  |\n| Background:    | This Airworthiness Directive requires certain actions to extend the aircraft service life.Amendment 4 introduced Revision 7 of the Requirement document, which changed applicability and clarified actions required on accomplishment of SB 57-59 re. “Special Inspections” additional actions.Amendment 5 was prompted by the omission of the starboard flap operating lever part number SC7-45-1766 from Revision 7 of the Requirement document. Revision 8 corrected this anomaly.               |\n\n|     | Amendment 6 is issued in response to a new EASA AD, which introduces additional information and clarifies requirements. |\n| --- | ----------------------------------------------------------------------------------------------------------------------- |\n\n![](image.001.png)  \nDavid Villiers  \nDelegate of the Civil Aviation Safety Authority\n\n1 February 2007","sortOrder":0},{"sectionNumber":"AD/SC7/13 Amdt 6","sectionType":"part","heading":"AD/SC7/13 Amdt 6","content":"## AD/SC7/13 Amdt 6","sortOrder":1},{"sectionNumber":"Fatigue Life Limitations","sectionType":"part","heading":"Fatigue Life Limitations","content":"## Fatigue Life Limitations","sortOrder":2},{"sectionNumber":"3/2007","sectionType":"part","heading":"3/2007","content":"## 3/2007","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":3,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original scope of regulating fatigue life limitations for Short SC7 Skyvan aircraft. Amendment 6 represents incremental refinement — correcting an omission regarding the starboard flap operating lever (part SC7-45-1766) that was accidentally excluded in Amendment 5/Revision 7. The amendment does not expand beyond the original safety purpose of managing structural fatigue in these aircraft."},"complexity_factors":["Short, single-purpose document (approximately 300 words)","Only 1 defined term implicitly used (\"starboard\" — right side)","Single cross-reference to external document (EASA AD 2007-0013)","Simple conditional logic: if life unknown OR above limit → replace within 3 months","Limited applicability scope (specific aircraft models with 6 serial number exceptions)","No nested exceptions or layered definitions","Clear compliance deadline structure"],"plain_english_summary":"This AD mandates fatigue life limits for parts of Short SC7 Skyvan Series 3/3A/3M (excluding six listed serials) by adopting EASA AD 2007-0013. It requires operators to establish life usage for affected components and, for the starboard flap operating lever (PN SC7-45-1766), replace it within three months of 15 March 2007 if its history is unknown or it has exceeded limits.\n\nIt matters because enforcing life limits prevents metal-fatigue failures and potential structural accidents."},"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"},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"This Amendment (Amendment 6) corrects and clarifies the AD by adopting a new EASA AD and ensuring the starboard flap operating lever (P/N SC7-45-1766) is explicitly covered. Previous amendments altered applicability and added inspection clarifications; Amendment 5 corrected an omission and Revision 8 of the Service Bulletin corrected that. These are refinements and corrections to the original safety-focused purpose rather than a significant expansion of scope beyond the AD's original intent to impose fatigue-life limitations and necessary replacements/inspections."},"complexity_factors":["Short, single-topic AD focusing on fatigue life limits for a small set of airframe models","One explicit excluded list of six serial numbers","Direct reference to one external EASA AD (2007-0013)","Dependence on one manufacturer Service Bulletin (SB 51-51 Rev 8) for technical limits and procedures","One specifically named part (starboard flap operating lever, P/N SC7-45-1766) with a single 3-month replacement requirement if life unknown/exceeded","Limited conditional logic (establish life history; if unknown or over limit then replace within 3 months)","Cross-reference complexity comes from reliance on external documents rather than internal multi-part exceptions"],"plain_english_summary":"**What this directive does (mechanically)**\n\n- This Airworthiness Directive (AD) applies to Short SC7 (Skyvan) Series 3, 3A and 3M aeroplanes, except six listed serial numbers (SH 1845, SH 1847, SH 1883, SH 1889, SH 1943, SH 1960).\n- It adopts the actions required by EASA AD 2007-0013 and refers operators to Shorts Service Bulletin (SB) 51-51 Revision 8 (or a later EASA-approved revision) for the detailed procedures.\n- From the AD effective date (15 March 2007), operators must establish the life history (hours/cycles) of certain parts. In particular, the starboard flap operating lever, part number SC7-45-1766, must have its life history established. If the life history is unknown or the part has exceeded the life limit listed in SB 51-51 Rev 8 (or later approved revision), that part must be replaced within 3 months of the AD's effective date.\n\n**Who this affects**\n\n- Aircraft owners and operators of the affected Short SC7 Skyvan aircraft (except the six excluded serial numbers).\n- Maintenance organisations and engineers who perform aircraft maintenance and keep component life records.\n\n**Why it matters (stated purpose and practical effect)**\n\n- Stated purpose: the AD imposes fatigue life limitations and related inspections or replacements to manage structural/component fatigue and thereby maintain airworthiness. The AD adopts EASA-mandated requirements and incorporates a manufacturer service bulletin.\n- Practical effect: affected operators must verify records for specified components and replace parts that have unknown or exceeded life limits within the specified timeframe. That produces immediate cost (parts, labour, downtime) and administrative work (record checks), and reduces the risk of component failure due to fatigue by enforcing life limits.\n\n**Mechanics, incentives and trade-offs**\n\n- Who pays: aircraft owners/operators bear the costs of inspections, record searches, and replacement parts and labour.\n- Who decides: CASA (via this AD) mandates compliance; approved maintenance organisations decide how to implement the inspections and replacements in practice.\n- Behaviour changes required: operators must (a) look up and document the life history for affected components, (b) replace any part with unknown or exceeded life within 3 months, and (c) follow the detailed steps in the referenced SB and the EASA AD.\n- Incentives and mitigation options: an operator can avoid immediate replacement by producing verifiable life-history records for a part; this creates an incentive to preserve and produce historical maintenance records. If records are missing, the rule forces replacement, which may induce operators to improve record-keeping going forward.\n- Trade-offs and costs: the AD improves conformity with fatigue life standards at the cost of replacement parts, maintenance labour and aircraft downtime. There is potential risk that replacement parts may be scarce, which would affect compliance timing and operational availability.\n- Implementation risk and compliance burden: the AD depends on external documents (EASA AD and SB 51-51 Rev 8). Operators must obtain and follow those documents; compliance is partly conditional on locating historical records, which can be time-consuming. Enforcement relies on continuing surveillance and maintenance record audits.\n\n**Source claims vs effects**\n\n- The AD cites EASA AD 2007-0013 and SB 51-51 Rev 8 as its technical source. The stated safety rationale is to control fatigue life and extend safe service life through prescribed inspections and replacements.\n- Empirical effects follow mechanical requirements above: concentrated costs on affected aircraft owners/operators, diffuse safety benefits for aircraft occupants and the public, and administrative burden on maintenance providers.\n\n**Relevant references in the AD text**\n\n- EASA AD 2007-0013 is the technical requirement adopted by this AD.\n- Shorts Service Bulletin 51-51 Revision 8 (or later EASA-approved revision) contains the life limits and detailed procedures that the AD makes mandatory.\n\n(For operational compliance, read the referenced EASA AD and SB 51-51 Rev 8; this summary sets out the AD's required actions and immediate consequences.)"}},"importantCases":[],"_links":{"self":"/api/acts/ad-sc7-13-amdt-6-fatigue-life-limitations","history":"/api/acts/ad-sc7-13-amdt-6-fatigue-life-limitations/history","analysis":"/api/acts/ad-sc7-13-amdt-6-fatigue-life-limitations/analysis","conflicts":"/api/acts/ad-sc7-13-amdt-6-fatigue-life-limitations/conflicts","importantCases":"/api/acts/ad-sc7-13-amdt-6-fatigue-life-limitations/important-cases","documents":"/api/acts/ad-sc7-13-amdt-6-fatigue-life-limitations/documents"}}