{"id":"F2006B07025","name":"AD/SF340/94 - Aileron and Elevator Trim Tab Fittings","slug":"ad-sf340-94-aileron-and-elevator-trim-tab-fittings","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":48704,"registerId":"commonwealth-F2006B07025-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.001.png)  \n\nFor the reasons set out in the background section, the CASA delegate whose signature appears below issues the following Airworthiness Directive (AD) under subregulation 39.1 (1) of CASR 1998. The AD requires that the action set out in the requirement section (being action that the delegate considers necessary to correct the unsafe condition) be taken in relation to the aircraft or aeronautical product mentioned in the applicability section: (a) in the circumstances mentioned in the requirement section; and (b) in accordance with the instructions set out in the requirement section; and (c) at the time mentioned in the compliance section.\n\n![](image.001.png)  \n\nSAAB SF340 Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/SF340/94 Aileron and Elevator Trim Ta","sectionType":"part","heading":"AD/SF340/94 Aileron and Elevator Trim Tab Fittings 13/2003","content":"# AD/SF340/94 Aileron and Elevator Trim Tab Fittings 13/2003\n\nApplicability: Model SF340A aircraft, serial numbers 004 through 159.\n\nModel 340B aircraft, serial numbers 160 through 459.\n\nRequirement: Action in accordance with SAAB Service Bulletin 340-51-025.\n\nNote: LFV AD 1-194 refers.\n\nCompliance: Within 800 flight hours or 6 months after 25 December 2003, whichever occurs first.\n\nThis Airworthiness Directive becomes effective on 25 December 2003.\n\nBackground: The manufacturer received reports of incorrect installation of rivets holding the retainers for the elevator trim tab bearings. This condition could result in the trim tab bearings coming loose, which could lead to excessive play in the trim tab system with consequent severe oscillations affecting control. The aileron system has a similar design.\n\n![Signature of David Villiers Delegate of the Civil Aviation Safety Authority](image.002.png)  \n\nDavid Villiers\n\nDelegate of the Civil Aviation Safety Authority 12 November 2003\n\n![](image.001.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 3 December 2003.","sortOrder":1}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This is a standard airworthiness directive with a tightly scoped, single-purpose safety mandate. The scope remains precisely limited to addressing the specific rivet installation defect in the stated aircraft models."},"complexity_factors":["Very short document (under 300 words)","Only 4 defined structural sections (Applicability, Requirement, Compliance, Background)","Single cross-reference to external technical document (SAAB Service Bulletin 340-51-025)","Single cross-reference to foreign aviation directive (LFV AD 1-194)","Simple conditional logic: 'whichever occurs first' compliance deadline","No nested exceptions or conditional sub-clauses","Clear, non-technical background explanation included"],"plain_english_summary":"This CASA safety order requires owners/operators of Saab SF340A (s/n 004–159) and 340B (s/n 160–459) to inspect and repair aileron and elevator trim tab fittings where rivets may be incorrectly installed. Following SAAB Service Bulletin 340‑51‑025 must be completed within 800 flight hours or six months after 25 Dec 2003 to prevent trim-tab looseness, severe vibration and potential loss of control."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The Directive applies to the specified SF340 serial-number ranges and requires corrective action per the SAAB service bulletin to address the reported unsafe condition. The text contains no indication that the scope was altered from the instrument’s stated safety-focused purpose."},"complexity_factors":["Safety-critical technical inspection and repair requirement (Background: incorrect rivet installation leading to possible loose bearings)","Reliance on an external manufacturer document for mandated corrective steps (Requirement: SAAB Service Bulletin 340-51-025)","Narrow, serial-numbered applicability limiting affected fleet (Applicability: SF340A s/n 004–159; 340B s/n 160–459)","Fixed compliance window creating scheduling pressure (Compliance: within 800 flight hours or 6 months after 25 Dec 2003)","Regulatory enforcement by CASA delegate (Signature: Delegate of the Civil Aviation Safety Authority)","Cross-reference to foreign AD increases traceability but adds another compliance reference (Note: LFV AD 1-194)","Direct operational cost and downtime risk for aircraft operators required to perform work"],"plain_english_summary":"Requires operators of SAAB SF340A and 340B aeroplanes (serial numbers 004–459) to carry out the inspection/repair actions set out in SAAB Service Bulletin 340-51-025 to correct aileron and elevator trim-tab fitting installations. CASA’s delegate made compliance mandatory within 800 flight hours or six months of 25 December 2003. Operators bear the inspection and repair costs; CASA enforces the requirement. The AD responds to reports that incorrectly installed rivets can allow trim-tab bearings to loosen and cause severe control oscillations."}},"importantCases":[],"_links":{"self":"/api/acts/ad-sf340-94-aileron-and-elevator-trim-tab-fittings","history":"/api/acts/ad-sf340-94-aileron-and-elevator-trim-tab-fittings/history","analysis":"/api/acts/ad-sf340-94-aileron-and-elevator-trim-tab-fittings/analysis","conflicts":"/api/acts/ad-sf340-94-aileron-and-elevator-trim-tab-fittings/conflicts","importantCases":"/api/acts/ad-sf340-94-aileron-and-elevator-trim-tab-fittings/important-cases","documents":"/api/acts/ad-sf340-94-aileron-and-elevator-trim-tab-fittings/documents"}}