AD 98-04-36
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Gulfstream Aerospace Corporation | G-159 | Airworthiness Directives; Gulfstream Model G-159 Series Airplanes |
Unsafe Condition
Operating the airplane in severe icing conditions outside the certification envelope specified in Appendix C of part 25 presents an unsafe condition due to inadequate flight crew information for recognizing and exiting such conditions.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Revise the Airplane Flight Manual (AFM) Limitations Section to prohibit flight in severe icing conditions (as determined by visual cues like ice accumulation on engine nacelles), limit or prohibit use of flight control devices, and provide recognition cues and exit procedures. Revise Normal Procedures Section to limit flap use and prohibit autopilot when ice forms aft of protected wing surfaces or unusual trim conditions occur.
AI-generated summary from the source AD text. Verify against the official source before acting.
Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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