# STC SH4539NM

- Type: Supplemental type certificate
- Status: Current, Amended
- Holder: Air One Helicopters, Inc, United States
- Description: Establish a nine passenger seat configuration.
- Status date: May 26, 1989
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 1H11](https://openairdocs.org/tcds/1H11)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0EFEEEB7170FAF8D85256CC2005C3246.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH4539NM

## ADs that name it (0)

None.

## Approved models (6)

- Sikorsky Aircraft Corporation S-58BT ([TCDS 1H11](https://openairdocs.org/tcds/1H11))
- Sikorsky Aircraft Corporation S-58DT ([TCDS 1H11](https://openairdocs.org/tcds/1H11))
- Sikorsky Aircraft Corporation S-58ET ([TCDS 1H11](https://openairdocs.org/tcds/1H11))
- Sikorsky Aircraft Corporation S-58FT ([TCDS 1H11](https://openairdocs.org/tcds/1H11))
- Sikorsky Aircraft Corporation S-58HT ([TCDS 1H11](https://openairdocs.org/tcds/1H11))
- Sikorsky Aircraft Corporation S-58JT ([TCDS 1H11](https://openairdocs.org/tcds/1H11))

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