AD 2017-20-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Gulfstream | Aerospace Corporation | Airworthiness Directives; Gulfstream Aerospace Corporation Airplanes |
Unsafe Condition
The type design sealant (AMS 3374 or GMS 4107) applied to the auxiliary power unit (APU) enclosure (firewall) failed to meet the requirement in 14 CFR 25.1191(b)(1) for a firewall to be fireproof, and ignited during fire testing, potentially propagating an uncontained fire to other critical areas of the airplane.
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Required Actions
Revise the airplane flight manual (AFM) to include operating procedures for airplanes with AMS 3374 or GMS 4107 sealant applied to the APU enclosure. Revise the applicability to include additional airplanes.
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Compliance Time
Within 12 months of the effective date (November 6, 2017)
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Affected Aircraft
Gulfstream Aerospace Corporation airplanes, including Model G-IV, GIV-X, GV-SP, and Model GV, with AMS 3374 or GMS 4107 sealant applied to the APU enclosure (firewall).
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Source: Official FAA Source ↗
Retrieved: Apr 6, 2026
Rights: U.S. Government Public Domain
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