# STC SA657WE

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Qualitron Aero Inc, United States
- Description: AiResearch GTP30-54 auxiliary turbine power unit for ground operation only.
- Status date: January 1, 1960
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS A-814](https://openairdocs.org/tcds/A-814)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/5BB15411E9C5036C862570D20057CF31.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA657WE

## ADs that name it (0)

None.

## Approved models (3)

- Vickers-Armstrongs (Aircraft Limited) Viscount 744 ([TCDS A-814](https://openairdocs.org/tcds/A-814))
- Vickers-Armstrongs (Aircraft Limited) Viscount 745 ([TCDS A-814](https://openairdocs.org/tcds/A-814))
- Vickers-Armstrongs (Aircraft Limited) Viscount 745D ([TCDS A-814](https://openairdocs.org/tcds/A-814))

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