AD 48-27-03
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 649 and 749 Series Airplanes |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 649 and 749 Series Airplanes |
Unsafe Condition
Propeller hub threaded portions may not withstand excessive stresses due to insufficient shotpeening, leading to potential failure under certain operating conditions.
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Required Actions
Propeller hubs must be returned to Curtiss-Wright Corp. for shotpeening of the threaded portion. Hubs not peened before specific operating hours must be temporarily withdrawn or permanently removed from service. All hubs must be peened by February 1, 1949.
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Compliance Time
Compliance required by August 1, 1948, and February 1, 1949.
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Affected Aircraft
Lockheed Models 649 and 749 Series Airplanes equipped with Curtiss C632S-A/850-4C2-0 propellers.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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