AD 90-12-07
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
Loss of wing attachment integrity due to undetected wing-attach bolt stress corrosion.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace steel wing-attach bolts and nuts with Inconel bolts and nuts per Beech Structural Inspection and Repair Manual P/N 98-39006. Visually inspect newly installed Inconel nuts for cracks per Mandatory Service Bulletin 2248 and replace cracked nuts with Part No. 81790-144. Allow flight under FAR 21.197 to reach compliance location.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
within the next 12 calendar months after the effective date of this AD, unless already accomplished
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Beech Model 99 Series (all serial numbers) airplanes certificated in any category
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
This site is not affiliated with or endorsed by the FAA. Always verify with official sources.