AD 84-20-08
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Gulfstream Aerospace Corporation | G-159 | Airworthiness Directives; GULFSTREAM AEROSPACE CORPORATION Model G-159 Airplanes |
Unsafe Condition
Corrosion or failure of the forward and aft engine mount assemblies, specifically Vickers Drawing Number 81037, Sheet 29, and Gulfstream Aerospace Drawing Numbers 159W10432-1 (L/H) and 159W10432-3 (R/H).
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Inspect the forward and aft engine mounts within 200 hours time in service or four months after the AD's effective date, whichever is sooner. Depending on corrosion findings, replace corroded tubes before further flight or categorize corrosion severity and perform corresponding actions (e.g., treat, reinspect, or replace within specified intervals). For Category B mounts, replace before 7500 landings plus 25 landings. Category A mounts must undergo ultrasonic/visual inspections to qualify for extended life limits up to 20,000 landings with periodic re-inspections.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Within 200 hours time in service or four months after the effective date of this AD, whichever is sooner.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Gulfstream Aerospace Corporation Model G-159 airplanes certificated in all categories.
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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