AD 60-21-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | Lockheed Aircraft Corporation | 18 | LOCKHEED Model 18 Aircraft |
Unsafe Condition
Excessive temperature stratification at the carburetor air screen during operation with partial carburetor air preheat may cause erroneous cockpit carburetor air temperature gage readings and ice formation on the air screen and carburetor under icing conditions.
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Required Actions
Restrict operation into known icing conditions until modifications per PacAero SB No. 14 are accomplished. Install a placard prohibiting operation into known icing conditions and amend the AFM. Modify the carburetor air preheat system per FAA-approved SB No. 14 to prevent ice formation and ensure safe operation under varying conditions.
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Compliance Time
Effective November 15, 1960
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Affected Aircraft
Lockheed Model 18 Aircraft converted to the 'Learstar' configuration
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Source: Official FAA Source ↗
Retrieved: Apr 8, 2026
Rights: U.S. Government Public Domain
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