{"id":"F2006B06813","name":"AD/SD3-30/12 Amdt 1 - Rib/Skin Attachment Cleats at Left Wing Station 160","slug":"ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":114677,"registerId":"commonwealth-F2006B06813-current","compilationNumber":null,"startDate":"2026-04-03","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/SD3-30/12 Amdt 1 - Rib/Skin Attachment Cleats at Left Wing Station 160","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 SD3-30 Series Aeroplanes\n\nAD/SD3-30/12\n\nAmdt 1\n\n  \n\nRib/Skin Attachment Cleats at Left Wing Station 160\n\n  \n13/93\n\nApplicability: Model SD3-30 with serial numbers SH3002 through SH3090.\n\nRequirement: Action in accordance with Shorts Mandatory Service Bulletin SD3-57-10 Revision 2.\n\nCompliance: As specified in the Requirement Document, with flight hours to count from previous certified compliance.\n\nThis Amendment is effective from 9 December 1993.\n\nBackground: The manufacturer received reports of cases where cracks have been detected in the rib/skin attachment cleats at the wing upper surface, Station 160. Amendment 1 is issued in response to the latest issue of the Requirement Document which aligns SB Paragraph 1.E, Part A,4 with the \"Not Exceed Time\" specified in the Maintenance Programme.","sortOrder":0}],"analysis":{"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":true,"description":"The Amendment does not expand the set of affected aircraft or introduce new affected components in the text provided; instead it revises the Requirement Document to align SB Paragraph 1.E, Part A,4 with the \"Not Exceed Time\" in the Maintenance Programme. This is a change to the timing and scheduling mechanics of the mandatory action rather than a change to applicability or to the fundamental objective of addressing detected cracks in rib/skin attachment cleats. (Background; Requirement; Compliance)"},"complexity_factors":["External dependence: mandatory compliance is by reference to an external Requirement Document (Shorts Mandatory Service Bulletin SD3-57-10 Revision 2), requiring users to read and apply another document. (Requirement)","Technical specificity: the subject matter concerns a particular structural item (rib/skin attachment cleats at wing Station 160), implying technical inspection/repair procedures in the Service Bulletin. (Background)","Record-keeping rule: flight hours for compliance intervals must be counted from previous certified compliance, which requires verification of prior records. (Compliance)","Narrow applicability: only affects a defined set of serial numbers (SH3002–SH3090), so tracking applicability is straightforward but must be done precisely. (Applicability)","Amendment alignment: the Amendment alters timing/alignment language (SB Paragraph 1.E, Part A,4) to match the Maintenance Programme’s \"Not Exceed Time\", which affects scheduling but not broad scope. (Background)"],"plain_english_summary":"What this instrument does (mechanically):\n\n- It mandates that operators of certain Short SD3-30 aeroplanes carry out the maintenance actions set out in a specific Requirement Document: Shorts Mandatory Service Bulletin SD3-57-10 Revision 2 (Requirement). (Requirement)\n- It applies only to SD3-30 aeroplanes with serial numbers SH3002 through SH3090. (Applicability)\n- It requires compliance according to the times and procedures stated in that Requirement Document, and specifies that flight hours for the compliance interval are to be counted from any previous certified compliance. (Compliance)\n- The amendment took effect on 9 December 1993. (This Amendment)\n\nWhy the instrument was issued (as stated):\n\n- The manufacturer reported that cracks had been detected in the rib/skin attachment cleats at the wing upper surface, Station 160. The Amendment responds to a new issue of the Requirement Document which aligns a specific paragraph (SB Paragraph 1.E, Part A,4) with the “Not Exceed Time” in the Maintenance Programme. (Background)\n\nWho it affects and who pays:\n\n- Affected parties are the owners/operators of SD3-30 aeroplanes with serial numbers SH3002–SH3090. (Applicability)\n- The instrument does not supply funds or say anyone else will perform the work. Therefore the practical cost of inspections, repairs or modifications required by the Service Bulletin will fall to those owners/operators. (Requirement)\n\nWho decides and what is mandated:\n\n- The Civil Aviation Safety Authority issued the Airworthiness Directive as part of the Commonwealth schedule of ADs. The AD makes compliance with the named Service Bulletin mandatory for the affected serial numbers. (Schedule of Airworthiness Directives; Requirement)\n- The AD sets the compliance mechanism by reference to the Requirement Document and by specifying how to count flight hours for the compliance interval. (Compliance)\n\nPractical effects on behaviour and business decisions:\n\n- Affected operators must schedule and carry out the inspections/repairs in the Service Bulletin within the specified intervals and keep records that count flight hours from any previous certified compliance. (Requirement; Compliance)\n- That will impose maintenance planning, labour, parts and downtime costs on those operators. (Requirement; Compliance)\n\nImplementation risks, trade-offs and compliance burden (source-grounded):\n\n- The AD creates a compliance burden by making performance of an external document (Shorts Mandatory Service Bulletin SD3-57-10 Revision 2) mandatory rather than optional; operators must locate, interpret and implement that document. (Requirement)\n- Counting flight hours from previous certified compliance may require operators to verify past maintenance records to determine the correct compliance schedule. (Compliance)\n- The Background identifies a specific structural risk (cracking in rib/skin attachment cleats at Station 160) as the stated reason for the directive; the Amendment adjusts timing language in the Requirement Document to align with the Maintenance Programme, which changes how the directive is scheduled but does not, in the text, expand the set of affected aircraft. (Background)\n\nTrade-offs and opportunity costs (source-grounded):\n\n- Operators will divert resources (maintenance labour, workshop time, parts) to satisfy the AD within the stated compliance times instead of using those resources elsewhere. (Requirement; Compliance)\n\nDiscretion and enforcement (source-grounded):\n\n- The AD prescribes the Requirement Document and the counting rule; it does not, in the text provided, delegate broader discretion or set out penalties. Enforcement and interpretation of compliance will be carried out under the usual Civil Aviation regulatory framework implicit in the Schedule of Airworthiness Directives. (Schedule of Airworthiness Directives; Requirement)\n\nSource references: Applicability; Requirement; Compliance; Background; This Amendment."},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive amendment. It remains tightly focused on its original purpose: addressing a specific structural defect in a specific aircraft model. The amendment merely updates timing alignment with maintenance programmes without expanding the scope beyond the original safety concern."},"complexity_factors":["Very short document (under 200 words)","Only 1 defined term implicitly referenced (Station 160 — a wing location marker)","Single cross-reference to external technical document (Shorts Mandatory Service Bulletin SD3-57-10 Revision 2)","No nested conditions or exceptions","Straightforward compliance structure: identify aircraft → follow bulletin → comply by specified time","Minimal legislative drafting — essentially a regulatory notice incorporating manufacturer instructions by reference"],"plain_english_summary":"This is an **Airworthiness Directive** — a mandatory safety order issued by Australia's Civil Aviation Safety Authority (CASA) for a specific type of aircraft.\n\n**What it does:**\nOrders owners and operators of certain **Short SD3-30 Series Aeroplanes** (specifically serial numbers SH3002 through SH3090) to inspect and repair cracks found in a particular part of the left wing — the \"rib/skin attachment cleats\" at \"Station 160\" (a specific location on the wing's upper surface).\n\n**Who it affects:**\n- Owners and operators of Short SD3-30 aircraft with serial numbers SH3002 to SH3090\n- Maintenance engineers working on these aircraft\n\n**What must be done:**\nOperators must follow the instructions in **Shorts Mandatory Service Bulletin SD3-57-10 Revision 2** — a technical document from the aircraft manufacturer detailing exactly how to inspect and fix the problem.\n\n**When it must be done:**\nThe timeframe is set out in that Service Bulletin, with flight hours counted from when the aircraft was last certified as compliant with previous maintenance requirements.\n\n**Why it matters:**\nCracks in wing attachment points are serious safety risks. If left unchecked, they could lead to structural failure in flight. This directive ensures all affected aircraft get inspected and repaired before the cracks become dangerous. This amendment (Amendment 1) updates the timing requirements to match the aircraft's approved Maintenance Programme."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160","history":"/api/acts/ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160/history","analysis":"/api/acts/ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160/analysis","conflicts":"/api/acts/ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160/conflicts","importantCases":"/api/acts/ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160/important-cases","documents":"/api/acts/ad-sd3-30-12-amdt-1-rib-skin-attachment-cleats-at-left-wing-station-160/documents"}}