{"id":"F2006L03108","name":"AD/STORCH/1 - Elevator Trim Tab Mass Balance","slug":"ad-storch-1-elevator-trim-tab-mass-balance","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":60386,"registerId":"commonwealth-F2006L03108-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"Storch Aviation Slepcev Storch SS4 Serie","sectionType":"division","heading":"Storch Aviation Slepcev Storch SS4 Series Aeroplanes","content":"### Storch Aviation Slepcev Storch SS4 Series Aeroplanes\n\n| AD/STORCH/1 | Elevator Trim Tab Mass Balance | 11/2006 DM |\n| ----------- | ------------------------------ | ---------- |\n\n| Applicability: | All Slepcev SS-MK4 aircraft.                                                                                                                                                                                                                                                     |\n| -------------- | -------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |\n| Requirement:   | Remove the fabric from around the elevator trim tab mass balance arm. Inspect, using dye penetrant or a microscope, the mass balance attachment to detect any signs of cracking.If any cracking is detected, the attachment of the mass balance is to be repaired by re-welding. |\n| Compliance:    | The initial inspection and, if necessary, repair must be performed before further flight. Subsequent inspections must be performed at 200 hourly intervals.                                                                                                                      |\n|                | This Airworthiness Directive becomes effective on 20 September 2006.                                                                                                                                                                                                             |\n| Background:    | There have been two reported instances of cracking of the trim tab mass balance. In one instance the mass balance broke off after cracking progressed through the attachment weld and through the aluminium bracket.                                                             |\n\n![](image.001.png)  \nGreg Vaughan  \nDelegate of the Civil Aviation Safety Authority\n\n15 September 2006","sortOrder":0},{"sectionNumber":"AD/STORCH/1","sectionType":"part","heading":"AD/STORCH/1","content":"## AD/STORCH/1","sortOrder":1},{"sectionNumber":"Elevator Trim Tab Mass Balance","sectionType":"part","heading":"Elevator Trim Tab Mass Balance","content":"## Elevator Trim Tab Mass Balance","sortOrder":2},{"sectionNumber":"11/2006 DM","sectionType":"part","heading":"11/2006 DM","content":"## 11/2006 DM","sortOrder":3}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a targeted safety directive addressing a specific mechanical defect in a specific aircraft model. It has not expanded beyond its original purpose of addressing the reported cracking issue in the elevator trim tab mass balance attachment."},"complexity_factors":["Single, specific aircraft type affected (Slepcev SS-MK4 only)","Straightforward two-step requirement: inspect once immediately, then repeat every 200 hours","Only one defined term implicitly used ('mass balance' — explained by context)","No cross-references to other legislation or regulations","Simple conditional logic: if cracking detected → repair; if not → continue with periodic inspections","Total length: approximately 150 words of substantive content"],"plain_english_summary":"This AD orders immediate inspection of the elevator trim tab mass balance arm on Slepcev Storch SS4 (SS‑MK4) aircraft: owners must strip the fabric, inspect for cracks with dye penetrant or microscope before next flight, repair by re‑welding if cracked, and repeat inspections every 200 flight hours. \n\nIt affects all SS‑MK4 operators because past failures allowed a mass balance to fracture and detach, risking pitch control and flight safety; noncompliance grounds the aircraft."},"flash_summary":{"complexity_score":2,"scope_assessment":{"changed":false,"description":"The instrument as published applies to all Slepcev SS‑MK4 aircraft and prescribes inspection and repair steps; the text gives no indication the scope has been broadened or narrowed from any earlier intent."},"complexity_factors":["Narrow applicability: applies only to Slepcev SS‑MK4 aircraft (straightforward target population).","Clear required actions: remove fabric, inspect by dye penetrant or microscope, re‑weld if cracking found (procedural clarity).","Defined timing: initial inspection before further flight and recurring 200‑hour interval (simple compliance schedule).","Technical competence required: dye‑penetrant inspection and welding repairs require trained personnel and equipment (implementation burden).","Immediate operational impact: grounding risk until initial inspection/repair is completed increases urgency for owners/operators."],"plain_english_summary":"**Elevator Trim Tab Mass Balance AD (AD/STORCH/1)** — This directive requires owners/operators of all Slepcev SS‑MK4 aircraft to remove fabric around the elevator trim‑tab mass‑balance arm, inspect the attachment for cracking (dye penetrant or microscope) and re‑weld if cracks are found. Initial inspection and any repair must be done before further flight, with repeat inspections every 200 flight hours; owners/operators bear inspection and repair costs and the CASA delegate issued the directive."},"flash_summary_failed":{"failed":true,"reason":"A positive credit balance is required for all requests, including BYOK, so fallback providers remain available. Add credits at https://vercel.com/d?to=%2F%5Bteam%5D%2F%7E%2Fai%3Fmodal%3Dtop-up to continue.","source":"analysis-cron"}},"importantCases":[],"_links":{"self":"/api/acts/ad-storch-1-elevator-trim-tab-mass-balance","history":"/api/acts/ad-storch-1-elevator-trim-tab-mass-balance/history","analysis":"/api/acts/ad-storch-1-elevator-trim-tab-mass-balance/analysis","conflicts":"/api/acts/ad-storch-1-elevator-trim-tab-mass-balance/conflicts","importantCases":"/api/acts/ad-storch-1-elevator-trim-tab-mass-balance/important-cases","documents":"/api/acts/ad-storch-1-elevator-trim-tab-mass-balance/documents"}}