{"id":"F2006B09637","name":"AD/F100/35 - Elevator Tension Regulator Assembly","slug":"ad-f100-35-elevator-tension-regulator-assembly","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":54442,"registerId":"commonwealth-F2006B09637-current","compilationNumber":null,"startDate":"2026-04-02","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"1","sectionType":"section","heading":"AD/F100/35 - Elevator Tension Regulator Assembly","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)  \nFokker F100 (F28 Mk 100) Series Aeroplanes\n\nAD/F100/35 Elevator Tension Regulator Assembly 11/99\n\nApplicability: Model F.28 Mk. 0070 aircraft, serial numbers 11562, 11565 through 11572, 11575\n\nthrough 11583, and 11585; and Model F.28 Mk. 0100, serial numbers 11496 through\n\n11518.\n\nRequirement: Visually inspect the elevator gustlock counter bracket attachment bolts in accordance with Part 2. Accomplishment Instructions of STORK Fokker Service Bulletin F100- 27-076, dated July 1, 1999.\n\nNote: RLD AD 1999-094 refers.\n\nCompliance: Before 4 December 1999, unless already accomplished.\n\nThis Airworthiness Directive becomes effective on 4 November 1999.\n\nBackground: The RLD received a report of an incident where during a routine landing the flight crew could not move the control column to its fully aft position. Subsequent investigation revealed that one of three bolts which attach the elevator gustlock counter bracket to a pulley of the elevator tension regulator assembly, had come loose. This Directive requires a one-time inspection of the affected parts on a limited number of aircraft that were manufactured after a certain change in the production process.","sortOrder":0}],"analysis":{"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This Airworthiness Directive maintains its original narrow scope. It addresses a specific mechanical defect identified in a limited production run of aircraft. There is no evidence of scope creep; the directive remains tightly focused on the elevator tension regulator assembly issue as originally identified."},"complexity_factors":["Single, specific requirement (one visual inspection)","Limited applicability (specific serial numbers only)","No defined terms section","No cross-references to other legislation (only references a manufacturer service bulletin and a Dutch authority document)","Simple conditional structure (compliance deadline with single exception 'unless already accomplished')","Short document (approximately 150 words of substantive content)"],"plain_english_summary":"This Airworthiness Directive mandates a one‑time visual inspection of bolts securing the gustlock counter bracket to the elevator tension regulator pulley on specific Fokker F100 serials. It targets aircraft built after a production change and references the manufacturer’s service bulletin for the procedure.\n\nIt matters because a loose bolt in this location has caused the control column to jam — reducing aft control authority during landing — so the inspection was required to prevent a potentially catastrophic loss of pitch control (compliance due by 4 December 1999)."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"The AD limits action to the listed serial-numbered aircraft and requires a single inspection; it does not broaden applicability or impose ongoing obligations beyond that specified inspection."},"complexity_factors":["Narrow applicability: limited to specific Fokker F100 serial numbers (reduces scope complexity).","Single action: one-time visual inspection (simple maintenance task rather than ongoing program).","External procedure dependency: inspection must follow STORK Fokker Service Bulletin F100-27-076 (requires access to and understanding of that document).","Safety-critical consequence: failure to detect loose bolts can affect control movement, increasing enforcement and liability attention.","Fixed compliance window: specified effective date and final compliance date (logistical scheduling pressure).","Parts identification: locating the elevator gustlock counter bracket bolts and pulley requires correct component identification by maintenance staff.","Regulatory cross-reference: note referring to RLD AD 1999-094 creates traceability requirements in records and audits."],"plain_english_summary":"This directive mandates a one-time visual inspection of the elevator gustlock counter‑bracket attachment bolts on specified Fokker F100 serial numbers, carried out per STORK Fokker Service Bulletin F100‑27‑076. It applies to the owners/operators and maintenance organisations responsible for those aircraft.\n\nThe inspection must be done by 4 December 1999 (effective 4 November 1999) to detect loose bolts after a reported incident in which a loose bolt limited full aft control‑column movement."}},"importantCases":[],"_links":{"self":"/api/acts/ad-f100-35-elevator-tension-regulator-assembly","history":"/api/acts/ad-f100-35-elevator-tension-regulator-assembly/history","analysis":"/api/acts/ad-f100-35-elevator-tension-regulator-assembly/analysis","conflicts":"/api/acts/ad-f100-35-elevator-tension-regulator-assembly/conflicts","importantCases":"/api/acts/ad-f100-35-elevator-tension-regulator-assembly/important-cases","documents":"/api/acts/ad-f100-35-elevator-tension-regulator-assembly/documents"}}