{"id":"F2006B09651","name":"AD/F100/49 - Elevator Tension Regulator","slug":"ad-f100-49-elevator-tension-regulator","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54496,"registerId":"commonwealth-F2006B09651-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\n![](image.001.png)  \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 CAR 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\nFokker F100 (F28 Mk 100) Series Aeroplanes","sortOrder":0},{"sectionNumber":"AD/F100/49 Elevator Tension Regulator 9/","sectionType":"part","heading":"AD/F100/49 Elevator Tension Regulator 9/2002","content":"# AD/F100/49 Elevator Tension Regulator 9/2002\n\nApplicability: Model F.28 Mk. 0100 and Mk. 0070 aircraft, equipped with Elevator Tension Regulator Assemblies having part numbers D78179-405, \\-407, \\-409, \\-411, and \\-413.\n\nRequirement: Modify or replace Elevator Tension Regulators in accordance with the Accomplishment Instructions of Fokker Service Bulletin F100-27-081 and Component Service Bulletin D78179-27-017, both dated 1 January 2002.\n\nNote: Netherlands CAA AD 2002-058 refers.\n\nCompliance: Before 1 December 2003.\n\nThis Airworthiness Directive becomes effective on 5 September 2002.\n\nBackground: A report was received of an occurrence during terminal departure pushback, where the elevators of a Fokker 70 aircraft could not be moved through the full range of deflection. Investigation revealed that one of the three bolts that attach the adjuster bracket to the elevator tension regulator, had come loose. This Directive requires modification of the installed tension regulator or replacement with a modified tension regulator.\n\n![Signature of David Villiers, Delegate of the Civil Aviation Safety Authority.](image.002.jpeg)  \n\nDavid Alan Villiers\n\nDelegate of the Civil Aviation Safety Authority 15 July 2002\n\n![](image.001.png)","sortOrder":1}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains a narrow, targeted scope addressing a specific mechanical defect in specific aircraft models. There is no evidence of scope creep; the directive precisely matches its original safety purpose."},"complexity_factors":["Single, clearly defined applicability (specific aircraft models with specific part numbers)","Single, unambiguous requirement (modify or replace per specified service bulletins)","Single, fixed compliance deadline (no conditional triggers or phased implementation)","No defined terms section — uses plain technical language","No cross-references to other legislation (only a reference to a related Dutch aviation authority directive for information)","Background section provides clear factual context in plain language","Total length is approximately 250 words"],"plain_english_summary":"CASA has issued a mandatory safety order requiring owners/operators of Fokker F.28 Mk.0100 (F100) and Mk.0070 (F70) with specified Elevator Tension Regulator part numbers to modify or replace the regulator per Fokker service bulletins (1 Jan 2002).  \n\nThe fix prevents elevator jamming from a loose bolt—restoring full pitch control—and must be completed by 1 December 2003."},"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":2,"scope_assessment":{"changed":false,"description":"The instrument as supplied sets a specific scope (models and part numbers), a single corrective action method, and a compliance deadline. The text contains no amendment history or indication that the AD's scope was altered from its original issuance."},"complexity_factors":["Narrow applicability to specified aircraft models and listed part numbers (Applicability).","Single mandated remedy: modify or replace regulators according to two named Fokker service bulletins (Requirement).","Fixed compliance deadline and effective date create a straightforward scheduling burden (Compliance; Effective date).","Technical work must follow manufacturer Accomplishment Instructions, so execution requires access to parts, technical guidance and maintenance resources (Requirement).","Root safety issue is a reported loose bolt that restricted elevator deflection, which motivates a focused corrective action (Background)."],"plain_english_summary":"This Airworthiness Directive requires operators of Fokker F.28 Mk 100 and Mk 0070 aircraft fitted with certain Elevator Tension Regulator part numbers to modify or replace those regulators following Fokker service instructions. It responds to a reported loose bolt that restricted elevator movement. Compliance was required by 1 December 2003 and the AD took effect on 5 September 2002. Operators bear the cost and maintenance time to perform the manufacturer-prescribed work to restore the regulator design specified in the service bulletins."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f100-49-elevator-tension-regulator","history":"/api/acts/ad-f100-49-elevator-tension-regulator/history","analysis":"/api/acts/ad-f100-49-elevator-tension-regulator/analysis","conflicts":"/api/acts/ad-f100-49-elevator-tension-regulator/conflicts","importantCases":"/api/acts/ad-f100-49-elevator-tension-regulator/important-cases","documents":"/api/acts/ad-f100-49-elevator-tension-regulator/documents"}}