AD 59-06-02
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS All Model DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS All Model DC-7 Series Aircraft |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS All Model DC-7 Series Aircraft |
Unsafe Condition
The orifice check valve could malfunction due to contaminants in the hydraulic fluid (approximately 0.003-inch diameter), preventing full extension of the main landing gear.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Remove existing orifice check valve assemblies (P/N 4498423-503 or 4498423-5503) from each main landing gear actuating cylinder and replace with new assemblies (P/N 2230565-5-093 or P/N 4481262-5-093).
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
by first block overhaul after receipt of parts but not later than December 1, 1959
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Affected Aircraft
Douglas DC-7, DC-7B, DC-7C aircraft
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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