AD 55-15-04
Applicability
| Type | Manufacturer | Model | Details |
|---|---|---|---|
| aircraft | The Boeing Company | DC-6 | Airworthiness Directives; DOUGLAS All DC-6 Series Airplanes |
| aircraft | The Boeing Company | DC-6A | Airworthiness Directives; DOUGLAS All DC-6 Series Airplanes |
| aircraft | The Boeing Company | DC-6B | Airworthiness Directives; DOUGLAS All DC-6 Series Airplanes |
Unsafe Condition
Propeller feathering lines forward of the firewall may fail due to fire exposure, compromising the integrity of the propeller feathering system.
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 with fireproof/fire resistant hose assemblies (Aeroquip P/N 304004-10-17 1/2, Resistoflex SSFR-3800-10, or Aeroquip 309009-10S). Remove existing 304 sleeves from the feathering pump supply line and install Douglas P/N 3500614-1 fireproof cover. Alternative acceptable assemblies include Aeroquip 601000 with 304 full sleeves or Aeroquip 680-16S with 304 short sleeves.
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.
AI-generated summary from the source AD text. Verify against the official source before acting.
Affected Aircraft
Douglas DC-6, DC-6A, DC-6B series airplanes below fuselage No. 487 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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