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FAA
Federal Aviation Administration Department of Transportation
Aviation Safety
AIRWORTHINESS DIRECTIVE
Generated by Aircraft-logs.com — March 22, 2026

AD 55-15-01 ACTIVE

Propeller Feathering Lines
Key Information
AD Number 55-15-01 Status Active
Effective Date Not specified Issue Date Not specified
Docket Number Unknown Amendment N/A
Product Type ["Aircraft"] Product Subtype ["Large Airplane"]
CFR Part --- - Part 39 CFR Section N/A
Citation This information is not available.
Applicability
Manufacturer(s) Aero Spacelines, Incorporated
Model(s) 377 377MG 377SGT
Regulatory Text

55-15-01 BOEING: Applies to All Boeing 377 Series Aircraft with Hamilton Standard Propellers.
Compliance required by first scheduled engine change after November 1, 1955, but not later than November 1, 1956.
To increase the fire resistance integrity of the propeller feathering system against damage by a powerplant fire, all flexible hose components of propeller feathering lines forward of the firewall in zone 2 must be replaced with lines and fittings which will meet current fire resistance requirements. The following hose assemblies are considered acceptable for this applications:
(a) Aeroquip 680-10S hose assemblies with Aeroquip 304 protective sleeves over end fittings (Aeroquip assembly P/N 304000).
(b) Resistoflex SSFR-3800-10 hose assemblies.
(c) Aeroquip 309009-10S hose assemblies.

AD 55-15-01 — Propeller Feathering Lines
Printed from Aircraft-logs.com — 03/22/2026