# STC SA1927SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: UNC Accessory Service, United States
- Description: Installation of Safeway De-Icer boot P/N 5660 and/or Semsa Lead P/N S.2001 in lieu of Dowty Rotol boots and/or leads on Dowty Rotol propeller model R245/4-40-4.5/13 with blades P/N 6.6000.2301 or model R259/4-40-4.5/17 with blades P/N 6.6000.4300. (440 M ILITARY C-131E D (640)) (240 SERIES 600) (340D)
- Status date: April 26, 1995
- Product: Aircraft, Large Multi-Engine
- Certification basis: Part 21
- Data sheets: [TCDS 6A6](https://openairdocs.org/tcds/6A6), [TCDS A-793](https://openairdocs.org/tcds/A-793)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6C8F48C9B337462D85256CCB0060186F.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA1927SW

## ADs that name it (0)

None.

## Approved models (3)

- Tracor Flight Systems Inc. 240 Series ([TCDS A-793](https://openairdocs.org/tcds/A-793))
- Tracor Flight Systems Inc. 340 ([TCDS 6A6](https://openairdocs.org/tcds/6A6))
- Tracor Flight Systems Inc. 440 Military C-131E ([TCDS 6A6](https://openairdocs.org/tcds/6A6))

---
OpenAirDocs.org is an independent research project of [Contrail Labs](https://contraillabs.com/). It is not affiliated with the FAA or the NTSB. Source documents are U.S. government works in the public domain.