{"id":"F2006B02385","name":"AD/AMD 50/19 - Speed Limitation - Arthur \"Q\" Feel Unit Failure","slug":"ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure","collection":"legislative_instrument","jurisdiction":"commonwealth","status":"in_force","isInForce":true,"actNumber":null,"makingDate":null,"administeringDepartment":null,"currentVersion":{"id":41615,"registerId":"commonwealth-F2006B02385-current","compilationNumber":null,"startDate":"2026-04-01","status":"InForce","reasons":null,"registeredAt":null},"sections":[{"sectionNumber":"AIRWORTHINESS DIRECTIVE","sectionType":"part","heading":"AIRWORTHINESS DIRECTIVE","content":"# AIRWORTHINESS DIRECTIVE\n\n![](image.002.png)\n\n![](image.002.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 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.","sortOrder":0},{"sectionNumber":"AD/AMD 50/19 Speed Limitation - Arthur \"","sectionType":"part","heading":"AD/AMD 50/19 Speed Limitation - Arthur \"Q\" Feel Unit Failure 2/2000","content":"# AD/AMD 50/19 Speed Limitation \\- Arthur \"Q\" Feel Unit Failure 2/2000\n\nDM\n\nApplicability: Models MF50, F900EX and MF 900.\n\nRequirement: If the control feel in pitch feels lighter than usual, reduce airspeed to 260KIAS or MI\n\n0.76 maximum.\n\nNote: DGAC AD 1999-464-029(B) refers.\n\nCompliance: Insert a copy of this Directive into the appropriate Section of the Aircraft Flight Manual (AFM) before further flight after the effective date of this Directive.\n\nThis Directive may be removed from the AFM following receipt, and incorporation into the AFM of whichever of the following documents is appropriate:\n\nMF900 Airplane Flight Manual DTM20102/20103. \\- Temporary change No. 80, MF900 Airplane Flight Manual FM900C - Temporary Change No. 4,\n\nF900EX Airplane Flight Manual DTM 561 - Temporary Change No. 46, MF50 Airplane Flight Manual DTM803/813 \\- Temporary Change No. 50, or MF50 Airplane Flight Manual FM813EX - Temporary Change No. 49.\n\nThis Airworthiness Directive becomes effective on 12 January 2000.\n\nBackground: A Mystere Falcon 900 recently experienced difficulties during descent arising from severe pitch oscillation. Although the root cause has yet to be established, the DGAC considers the pitch oscillation severity would have been reduced by limiting the airspeed when the pitch feel caution light illuminated.\n\nThe system is similar across several Falcon models hence the necessity for this Directive on all models.\n\n![](image.003.png)  \n\nEugene Paul Holzapfel\n\nDelegate of the Civil Aviation Safety Authority 6 January 2000\n\n![](image.002.png)  \n\nThe above AD is notified in the Commonwealth of Australia Gazette on 12 January 2000.","sortOrder":1}],"analysis":{"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"},"kimi_summary":{"content_quality":"ok","complexity_score":2,"scope_assessment":{"changed":false,"description":"This AD remains tightly scoped to its original purpose: addressing a specific flight control anomaly in specific Dassault Falcon aircraft. The directive targets exactly the models identified as having similar systems to the incident aircraft, with no expansion beyond this safety-critical interim measure."},"complexity_factors":["Single, clearly defined applicability (three specific aircraft models)","One straightforward operational requirement with a simple conditional trigger ('if control feels light, then slow down')","Minimal cross-referencing (only one reference to a French DGAC directive)","No defined terms section or interpretation provisions","Simple compliance mechanism (insert paper in manual, remove when manufacturer update arrives)","Short document (approximately 250 words of substantive text)"],"plain_english_summary":"This Airworthiness Directive covers certain Dassault Falcon business jets (MF50, F900EX, MF900) and requires pilots to immediately reduce speed to 260 kt or Mach 0.76 (whichever is lower) if the control stick feels unusually light in pitch. It’s an interim safety measure after a severe pitch-oscillation event; operators must insert the procedure into the Aircraft Flight Manual until manufacturer flight‑manual updates are issued and installed."},"flash_summary":{"complexity_score":3,"scope_assessment":{"changed":false,"description":"No. The Directive applies to the models listed and matches the stated intent that similar Q-feel systems across Falcon models justify the action (Applicability; Background). It does not broaden scope beyond those identified aircraft or add additional operational constraints beyond the single speed limitation and AFM insertion."},"complexity_factors":["Limited applicability: only Models MF50, F900EX and MF900 are named (Applicability).","Single conditional operational requirement: reduce speed if pitch feel is lighter than usual (Requirement).","Compliance mechanism is administrative: insert this Directive into the AFM before further flight (Compliance).","Temporary nature: Directive may be removed once specific temporary AFM changes are incorporated (Compliance).","Cross-reference to DGAC AD and reliance on incident background for rationale (Note; Background).","Clear effective date and signature, limiting regulatory uncertainty (Effective date; Delegate signature)."],"plain_english_summary":"This Airworthiness Directive requires operators of Falcon models MF50, F900EX and MF900 to reduce airspeed to 260 KIAS or Mach 0.76 when the pitch control feel is lighter than normal, and to insert the Directive into the Aircraft Flight Manual before the next flight. The limitation can be removed from the AFM once specified temporary AFM changes are incorporated.\n\nThe measure is presented as a response to a recent severe pitch oscillation; its stated aim is to reduce oscillation severity when the pitch-feel caution light illuminates."}},"importantCases":[],"_links":{"self":"/api/acts/ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure","history":"/api/acts/ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure/history","analysis":"/api/acts/ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure/analysis","conflicts":"/api/acts/ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure/conflicts","importantCases":"/api/acts/ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure/important-cases","documents":"/api/acts/ad-amd-50-19-speed-limitation-arthur-q-feel-unit-failure/documents"}}