47-50-13: Hub

FAA order 47-50-13 is an airworthiness directive. The FAA's subject line: Hub. System: propeller.

What it applies to as the FAA lists it

Kind of product: Propeller
Makes: Tarver Propellers, LLC
Models: F200

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 (831 characters)

47-50-13 DOWNER (BELLANCA and UNIVERSAL (Stinson):  Applies Only to Aircraft Equipped With Koppers Model Aeromatic F200 Propellers.
 
	Compliance required no later than the next 25-hour propeller lubrication and at 25 hours of operation thereafter.
 
	Inspect propeller hub as follows:
 
	Remove balancing band from both ends of hub barrel after index marking each to facilitate proper reassembly.  Examine the other surfaces of the hub completely for indications of line cracks or fractures.  The areas of primary concern are (1) those beneath the balancing bands, (2) the weld joint where hub barrel and mounting tube meet, and (3) the weld joint where mounting tube and mounting flange meet.
 
	Defective hubs should be removed from service.
 
	(Koppers Service Bulletin No. 12, dated October 9, 1947, covers this same subject.)

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/47-50-13.json · aircraft systems.