46-06-01: Front Fin Spar
FAA order 46-06-01 is an airworthiness directive. The FAA's subject line: Front Fin Spar. It names Ryan Aeronautical ST3: about 116 aircraft on the U.S. register today, though an order usually covers particular versions or serial numbers rather than every one. System: airframe structure.
What it applies to as the FAA lists it
- Kind of product
- Aircraft
- Makes
- Ryan Aeronautical Company
- Models
- ST-3KR
- On this site
- Ryan Aeronautical ST3 116 registered
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 (752 characters)
46-06-01 RYAN: (Was Service Note 5 of AD-749-1.) Applies Only to Model ST-3KR Aircraft Serial Numbers 1001 to 2249, Inclusive.
At each periodic inspection examine the front fin spar at its attachment to the fuselage for cracks. If no cracks are found and if spar has been reinforced at the critical section by means of a wood plug pressed into the end of the spar, no further action is mandatory. If cracks are found, the spar should be repaired by cutting the spar member approximately 3 1/4 inches above the lower bend and splicing on, by means of 3/16-inch bolts, a 1 1/8 by 0.058 inch X-4130 spar replacement section.
(Ryan Service Bulletin No. 1044 covers the installation of the wood plug and Ryan drawing SK-1879 covers the splice repair.)
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 October 7, 2026. Connections as data: /graph/directive/46-06-01.json · aircraft systems.