AD 55-15-05
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-7 | Airworthiness Directives; DOUGLAS All DC-7 Aircraft |
| aircraft | The Boeing Company | DC-7B | Airworthiness Directives; DOUGLAS All DC-7 Aircraft |
| aircraft | The Boeing Company | DC-7C | Airworthiness Directives; DOUGLAS All DC-7 Aircraft |
Unsafe Condition
Propeller feathering lines forward of the firewall in zone 2 may fail due to fire exposure, compromising the integrity of the propeller feathering system during a powerplant fire.
AI-generated summary from the source AD text. Verify against the official source before acting.
Required Actions
Replace existing propeller feathering lines forward of the firewall in zone 2 with fireproof/fire resistant lines and hose assemblies per Aeroquip Drawings 304005-10S-46 and Douglas P/N 3500614-2. Install Aeroquip 304 protective sleeves or acceptable alternatives as specified.
AI-generated summary from the source AD text. Verify against the official source before acting.
Compliance Time
By first scheduled engine change after November 1, 1955, but not later than November 1, 1956.
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Affected Aircraft
Douglas DC-7, DC-7B, DC-7C aircraft with serial numbers below 486 equipped with Hamilton Standard 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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