# AD 46-06-01: Front Fin Spar

- Type: Airworthiness directive
- Status: Current
- Products: Ryan Aeronautical ST-3KR
- Superseded by: Nothing supersedes this AD
- Product type: Aircraft, Small airplane
- Registered aircraft: 117 may be affected, by airframe or engine model (OpenAirDocs)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/75F05B849B20A24D86256A54006DDF7D.0001
- DRS record last changed: May 30, 2024
- Page: https://openairdocs.org/ad/46-06-01

## The airworthiness directive

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.)

## Affected data sheets (1) (OpenAirDocs)

The type certificate data sheets whose models the AD names.

- [TCDS A-749](https://openairdocs.org/tcds/A-749): Ryan Aeronautical Company; names 1 of 1 models: ST-3KR

## Registered aircraft it may apply to (OpenAirDocs)

Matched by airframe and engine model; the AD's applicability may narrow it by serial number, part number or equipment.

- Aircraft: 117 (117 by airframe model, 0 by engine model)
- Makers: Ryan Aeronautical 117

Models with the most aircraft:

- [Ryan Aeronautical ST3KR](https://openairdocs.org/model/ryan-aeronautical-st3kr): 117 aircraft (airframe model)

All 1 models: https://openairdocs.org/ad/46-06-01/models.md
Every aircraft: https://openairdocs.org/ad/46-06-01/aircraft.md

Its text cites no advisory circulars or STCs.

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