AD 92-04-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dassault Aviation | Mystere-Falcon 900 | Airworthiness Directives; DASSAULT AVIATION Model Mystere Falcon 900 Series Airplanes |
Unsafe Condition
Stiffness of the center engine power control and/or flight controls (elevator and rudder), and reduced controllability of the airplane due to clogging of the drain stub system.
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Required Actions
Verify drain stub heating operation and check air flow from drain stub every 7 days or less. Modify drain stub restrictor and install protective screens on drainage holes. Perform periodic checks and inspections every 300 hours or 6 months, followed by collector drain modifications within 12 months.
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Compliance Time
Within 30 days after the effective date (March 16, 1992), and thereafter at intervals not to exceed 7 days; modifications within 90 days; checks every 300 hours time-in-service or 6 months; collector drain modification within 12 months.
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Affected Aircraft
Dassault Aviation Model Mystere Falcon 900 series airplanes, certificated in any category.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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