# STC SA666GL

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Eagle Creek Aviation Services, United States
- Description: Engine cycle meter installation.
- Status date: March 9, 1983
- 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/6CF97BC4ED1C55AE85256CC200569FD8.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA666GL

## ADs that name it (0)

None.

## Approved models (6)

- Twin Commander Aircraft Corporation 690 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690B ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 690C ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 695 ([TCDS 2A4](https://openairdocs.org/tcds/2A4))
- Twin Commander Aircraft Corporation 695A ([TCDS 2A4](https://openairdocs.org/tcds/2A4))

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