# STC SA641AL

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Center Clinton C, United States
- Description: Fabricate front wing spar butt attachment repair fitting.
- Status date: July 10, 1978
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1A2](https://openairdocs.org/tcds/1A2)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DFEA3A073F4135C385256CC200569F50.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA641AL

## ADs that name it (0)

None.

## Approved models (11)

- The New Piper Aircraft Inc. PA-18 ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18-\"125\" (Army L-21A) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18-\"135\" (Army L-21B) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18-\"150\" ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18A ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18A-\"135\" ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18A-\"150\" ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18AS-\"125\" ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18AS-\"135\" ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18AS-\"150\" ([TCDS 1A2](https://openairdocs.org/tcds/1A2))
- The New Piper Aircraft Inc. PA-18\"105\" (Special) ([TCDS 1A2](https://openairdocs.org/tcds/1A2))

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