AD 48-26-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 649-79 | LOCKHEED Models 649 and 749 Series Aircraft |
| aircraft | Lockheed Aircraft Corporation | 749-79 | LOCKHEED Models 649 and 749 Series Aircraft |
Unsafe Condition
Failures under certain operating conditions due to engine speed operation outside specified ranges.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Install two placards in the cockpit (temporary by July 8, 1948, and permanent by August 1, 1948), mark all tachometers with specified bands and radial lines by August 1, 1948.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
Compliance required by July 7, 1948, and August 1, 1948.
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Affected Aircraft
Lockheed Models 649 and 749 Series Aircraft equipped with Curtiss C632S-A14/850-4C2-0 Propellers.
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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