# STC SA2726SW

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Sierra Industries, Inc, United States
- Description: Installation of 6-pole rotary squat switches.
- Applied: December 5, 1977
- Status date: December 1, 1999
- Product: Aircraft, Small Airplane
- Certification basis: Part 21
- Data sheets: [TCDS A5CE](https://openairdocs.org/tcds/A5CE), [TCDS A10CE](https://openairdocs.org/tcds/A10CE)
- Certificate PDF: https://openairdocs.org/files/sha256/3c/22/3c2266d685cb2d75f3db6cbc0c5355573339623dc4547510b7cf31f29fa64dff
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6BB31F8323A9807385256CC20008C815.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SA2726SW

## ADs that name it (0)

None.

## Approved models (17)

- Learjet Inc. 23 ([TCDS A5CE](https://openairdocs.org/tcds/A5CE))
- Learjet Inc. 24 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24B ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24B-A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24C ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24D ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24D-A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24E ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24F ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 24F-A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25 ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25A ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25B ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25C ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25D ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))
- Learjet Inc. 25F ([TCDS A10CE](https://openairdocs.org/tcds/A10CE))

## What the certificate says

Read from the PDF's text layer, without the form's printed wording; the layout is lost and the order can differ. The PDF is the record.

•Hmtrii $tatr» ©f oi tRzanspartntian - ^fc&cral jAfcialum JMmrims Ira turn Certificate SA2726SW Sierra Industries, Inc. , a Texas Corporation Garner Field Road Uvalde, TX 78801 Federal Aviation Civil Air/ A10CE, A5CE ,,, ... ..... '-,.,, Learjet Corp.

23, 24, 24A, 24B, 24B-A, 24C, 24D, 24D-A, 24E, 24F, 24F-A, 25, 25A, 25B, 25C, 25D, 25F Installation of 6 pole rotary squat switches according to Drawing 380001, Rev.

B, dated 2/6/78, or later FAA approved revision.

Compatibility of this modification with other previously approved modifications must be determined by the installer.

ttswt 6fa> daSa, or ir of 4r£e .- December 05, 1977 .• March 07, 1978 December 1, 1999 (Signature) Michele M. Owsley, Manager Airplane Certification Office, Southwest Region (Title) Any alteration of cfili crrtiftcatir is punlshabje ty a fine of not exceeding Sl,0t>0, or laprlionrasnt not MceedJn? 3 years, or botn.

FAA Forit 8110-2110-68) P«g* 1 of jncw with FAfl 21.47.

TRANSFER ENDORSEMENT Transfer the ownership of Supplemental Type Certificate Number to (Name of transferee) (Address of transferee) (Number and street) (City, State, and ZIP code} from (Name of grantor)(Print or type) (Address of grantor) (Number & street) (City, State, and ZIP code) Extent of Authority (if licensing agreement):

Signature of grantor (In

## Every issue (1)

- December 1, 1999: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/3c/22/3c2266d685cb2d75f3db6cbc0c5355573339623dc4547510b7cf31f29fa64dff)

---
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.