# STC SE81WE

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Aerostar Aircraft Corporation, United States
- Description: Installation of two Rajay turbo- chargers, Model 325EF80, P/N 0330-1 and -2, and 9 lb. +- 1 lb. sonic nozzle on Lycoming engine Model IO-540-S1A5.
- Status date: April 11, 1978
- Product: Engine
- Certification basis: Part 21
- Data sheets: [TCDS 1E4](https://openairdocs.org/tcds/1E4)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C3939FF7E5DB435085256CC2005C2D55.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SE81WE

## ADs that name it (1)

- [AD 2002-19-03](https://openairdocs.org/ad/2002-19-03): Crankshaft · Lycoming Engines IO-540-A1A5, IO-540-AA1A5, IO-540-AA1B5 and 81 more. Effective Sep 20, 2002. Named in the applicability

## Approved models (1)

- Textron Lycoming AVCO Corporation IO-540-S1A5 ([TCDS 1E4](https://openairdocs.org/tcds/1E4))

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