AD 80-07-06
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Textron Aviation Inc. | 76 | Airworthiness Directives; Beech Model 76 and Model 77 Series Airplanes |
| aircraft | Textron Aviation Inc. | 77 | Airworthiness Directives; Beech Model 76 and Model 77 Series Airplanes |
Unsafe Condition
A possible unbalanced rudder condition that could induce flutter due to trapped water in the rudder and rudder trim tab (if installed).
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Required Actions
Fabricate and install a temporary placard instructing pilots to check for trapped water before each flight. Within 25 hours time-in-service, drill new drain holes and seal gaps in the rudder and trim tab per Beechcraft Service Instructions No. 1116. Remove placard after completing the drainage modifications.
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Compliance Time
Prior to further flight (for placard installation) and within the next 25 hours time-in-service (for drainage modifications).
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Affected Aircraft
Beech Model 76 (serial numbers ME-1 through ME-252, ME-254, ME-256 through ME-261, ME-263 through ME-267, ME-269 through ME-274, ME-279, ME-283, ME-284, ME-286, ME-288 through ME-295, ME-297, ME-299, ME-300, ME-302 through ME-307, ME-309, ME-311 through ME-313, ME-315, and ME-316) and Model 77 (serial numbers WA-1 through WA-76).
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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