AD 47-10-23
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 49-46 | LOCKHEED Model 49 |
Unsafe Condition
Brass nuts (AC364-B524) installed on bolts through bathtub fittings at wing Station 80 may corrode and fail, leading to loss of wing structure integrity.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install AC364-524 steel nuts in place of any AC364-B524 brass nuts on bolts through bathtub fittings at wing Station 80. Check and replace all 170 nuts per airplane as necessary.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required immediately.
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Affected Aircraft
Lockheed Aircraft Corporation Model 49 serial numbers 1975, 1976, and 2021 through 2059.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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