AD 57-23-01
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 18 | LOCKHEED Model 18 Aircraft |
Unsafe Condition
Excessive air temperature and associated fire hazards in the vacuum system discharge line.
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Required Actions
Install a fusible plug in the vacuum pump discharge port with specified fittings and materials, or employ an oil separator equivalent to Genisco No. 40081 with a pressure relief valve. Modifications must ensure the plug does not damage other components if blown out.
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Compliance Time
at next engine overhaul but not later than July 15, 1958
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Affected Aircraft
Lockheed Model 18 Aircraft equipped with vacuum systems.
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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