# STC SA337GL-D

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: AiResearch Aviation Co, United States
- Description: Installation of AiResearch TPE331-1-151-K engines.
- Status date: August 27, 1980
- Product: Aircraft, Small Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 2A4](https://openairdocs.org/tcds/2A4)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/694C16D5EA64F73385256CC2000A9777.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA337GL-D

## ADs that name it (0)

None.

## Approved models (1)

- Twin Commander Aircraft Corporation 681 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

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