AD 92-15-13
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 99 | Airworthiness Directives; Beech Model 99 Series Airplanes |
| aircraft | Textron Aviation Inc. | 99A | Airworthiness Directives; Beech Model 99 Series Airplanes |
| aircraft | Textron Aviation Inc. | 99A (FACH) | Airworthiness Directives; Beech Model 99 Series Airplanes |
| aircraft | Textron Aviation Inc. | A99 | Airworthiness Directives; Beech Model 99 Series Airplanes |
| aircraft | Textron Aviation Inc. | A99A | Airworthiness Directives; Beech Model 99 Series Airplanes |
| aircraft | Textron Aviation Inc. | B99 | Airworthiness Directives; Beech Model 99 Series Airplanes |
| aircraft | Textron Aviation Inc. | C99 | Airworthiness Directives; Beech Model 99 Series Airplanes |
Unsafe Condition
Fatigue failure of the wing front spar lower cap and associated structure, and cracks, loose fasteners, or corrosion in wing structure components, nacelle splice plates, and spar reinforcing straps.
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Required Actions
Inspect specified wing structure components using visual, fluorescent penetrant, and eddy current methods at intervals not exceeding 500 or 1,000 hours time-in-service (TIS). Repair or replace if cracks, loose fasteners, or corrosion are found. Replace structural components upon reaching allowable service life or at intervals not exceeding 10,000 hours TIS. Report findings to FAA and ensure inspections are performed by qualified personnel.
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Compliance Time
Required as indicated, unless already accomplished. Inspections must be done within specified intervals after the effective date (August 24, 1992) or within the last 500/1,000 hours TIS, whichever is later.
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Affected Aircraft
Beech Model 99 series airplanes (serial numbers U-1 through U-49, and U-51 through U-164) with 3,000 hours or more time-in-service, except those with Beech Wing Modification Kit No. 99-4023-1S installed.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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