AD 49-41-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 649, 749, and 749A Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 649, 749, and 749A Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749A-79 | LOCKHEED Models 649, 749, and 749A Aircraft |
Unsafe Condition
Curtiss C632S-A Propeller Hub may develop cracks in the rear outboard portions of the hub barrels due to excessive stresses from over-speed or over-weight operations.
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Required Actions
Adjust propeller operating limits to 2,050-2,375 r.p.m., limit gross weight to 102,000 pounds maximum, inspect hubs with over 1,500 hours for cracks every 10-20 hours, retire hubs over 2,000 hours by November 30, 1949, and use magnetic inspections when equipment is available.
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Compliance Time
by October 11, 1949
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Affected Aircraft
Lockheed Models 649, 749, and 749A aircraft equipped with Curtiss Model C632S-A Propellers and Wright Model 749C18BD-1 Engines.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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