AD 2011-13-07
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Dassault | Aviation Model FALCON 7X | Airworthiness Directives; Dassault Aviation Model FALCON 7X Airplanes |
| aircraft | Aviat | Various | Airworthiness Directives; Dassault Aviation Model FALCON 7X Airplanes |
Unsafe Condition
Several occurrences of untimely radio-altimeter lock-up have been reported, where the failed radio-altimeter indicated a negative distance to the ground despite the aircraft was flying at medium or high altitude. A locked radio-altimeter 1 leads to untimely inhibition of warnings that could be displayed along with certain abnormal conditions while the avionic system switches into landing mode during altitude cruise.
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Required Actions
For airplanes without modification M0566 or Dassault Service Bulletin Falcon 7X-100: Within 14 days after January 28, 2010, revise the Limitations Section of the Dassault Falcon 7X Airplane Flight Manual (AFM) to include instructions for powering off radio-altimeter 1 in case of lock-up and prohibiting dispatch with any radio-altimeter inoperative. For airplanes with M0566 or Falcon 7X-100: Within 14 days after the effective date of this AD, revise the AFM to include instructions for reverting to the correct radio-altimeter output in case of lock-up.
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Compliance Time
Within 14 days after the applicable date (either January 28, 2010, or the effective date of this AD, July 27, 2011)
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Affected Aircraft
Dassault Aviation Model FALCON 7X airplanes, certificated in any category, all serial numbers.
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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