# STC SA550AL

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Ronald E Sullivan, United States
- Description: Installation of modified landing gear (PA-18 type) with main gear legs lengthened 6 inches.
- Status date: April 30, 1975
- Product: Aircraft, Single-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-780](https://openairdocs.org/tcds/A-780)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/F1E0907454385BC485256CC20012299A.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA550AL

## ADs that name it (0)

None.

## Approved models (1)

- The New Piper Aircraft Inc. PA-12 Series ([TCDS A-780](https://openairdocs.org/tcds/A-780))

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