55-15-01: Propeller Feathering Lines
FAA order 55-15-01 is an airworthiness directive. The FAA's subject line: Propeller Feathering Lines. System: propeller.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Aero Spacelines, Incorporated
- Models
- 377, 377MG, 377SGT
Dates and paperwork
- Docket
- Unknown
- Status
- Current
- The FAA's document
- Read the order on the FAA's site
The order itself the regulatory text, as published
Show the full text (811 characters)
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.
Source: FAA Dynamic Regulatory System, airworthiness directives. The FAA's document is the authority; the register counts are this site's, from the FAA register of November 6, 2026. Connections as data: /graph/directive/55-15-01.json · aircraft systems.