59-26-01: Hub Spiders

FAA order 59-26-01 is an airworthiness directive. The FAA's subject line: Hub Spiders. System: propeller.

What it applies to as the FAA lists it

Kind of product: Propeller
Makes: Hartzell Propeller, Inc.
Models: HC-12X20-1, HC-12X20-2, HC-12X20-3, HC-12X20-4, HC-12X20-5, HC-12X20-6, HC-12X20-7, HC-12X20-8, HC-12X20-9

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 (676 characters)

59-26-01  HARTZELL:  Applies to All HC-12X20 Propellers With Serial Numbers As Indicated Below. These Propellers May Be Installed On Such Aircraft Models As Downer (Republic) RC-3, Grumman G-44, and Navion Series.
 
	Compliance required not later than March 1, 1960.

	To preclude possible failures, remove from service Hartzell hub spiders with Serial Numbers 1 through 4303, 4307 through 4316, 4318, 4319, 4321, 4323, 4324, 4325, 4328, 4329, 4332 through 4336, 4341. After removal, these hub spiders will not be eligible for use in certificated aircraft.
 
	Hub spiders with serial numbers other than those listed may be used as replacements.
 
	This supersedes AD 53-06-02.

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/59-26-01.json · aircraft systems.