AD 79-23-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 77 | Airworthiness Directives; BEECH Model 77 Airplanes |
Unsafe Condition
Stripped threads or damage to NAS1112-11 or -15 wing main spar to fuselage carry-thru structure attachment bolts or Part Number 108-120010-5 internal nut plates could compromise structural integrity of wing attachment.
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Required Actions
Remove and inspect four NAS1112-11/-15 bolts and internal nut plates for stripped threads or damage. Replace damaged bolts or nut plates with new components. Modify, apply zinc chromate primer, and install correct AN960-1216 washers with Part Number 108-120013-1 radius washers. Ensure safety wire holes in bolt heads meet specified dimensions if using locally sourced bolts.
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Compliance Time
Prior to the next flight
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Affected Aircraft
BEECH Model 77 airplanes with serial numbers WA-1 through WA-39, WA-41, WA-42, and WA-44 through WA-46
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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