# STC SH593EA

- Type: Supplemental type certificate
- Status: Current, Surrendered
- Holder: Garrett Aviation Services, United States
- Description: Installation of Sperry C14A gyrosyn compass system.Descriptive data pertaining to this design change are considered inadequate for duplication in other products.  This approval is limited to only the installation made in Sikorsky, S61N, Serial No 61424.
- Applied: January 11, 1968
- Status date: December 14, 2005
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21
- Data sheets: [TCDS 1H15](https://openairdocs.org/tcds/1H15)
- Certificate PDF: https://openairdocs.org/files/sha256/15/ce/15ce6a4cc6512b4a7d7811c21051c346ac9634cae9c86fe737c1ff08c112af57
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/D9F05CD76FC7E1C6862570F1006A96B7.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH593EA

## ADs that name it (0)

None.

## Approved models (1)

- Sikorsky Aircraft Corporation S-61N ([TCDS 1H15](https://openairdocs.org/tcds/1H15))

## 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.

FAA Form 8110-2(10-68) Page 1 of 1 “Reissued on October 21, 2005 to supersede the original STC which has been lost or misplaced.”

Number SH593EA This certificate issued to Garrett Aviation Services, LLC Long Island MacArthur Airport 2221 Smithtown Avenue Ronkonkoma, NY 11779

Part 7/29 of the Civil Air/Federal Aviation Regulations.

Original Product -- Type Certificate Number : 1N15 Make : Sikorsky

Model : S61N Helicopter

Installation of a Sperry C14A Gyrosyn Compass System in accordance with AiResearch Drawing No. 536-S61-1000.

Descriptive data pertaining to this design change are considered inadequate for duplication in other products. This approval is limited to only the installation made in Sikorsky, S61N, Serial No 61424. This STC does not permit manufacturing of parts for multiple installations.

Date of application : January 11, 1968

Date of issuance : March 4, 1968 Date reissued : October 21, 2005, November 7, 2005

( Signature) Anthony Socias Manager New York Aircraft Certification Office

(Title)

## Every issue (3)

- December 14, 2005: Surrendered, Current. [certificate](https://openairdocs.org/files/sha256/15/ce/15ce6a4cc6512b4a7d7811c21051c346ac9634cae9c86fe737c1ff08c112af57)
- November 7, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/15/ce/15ce6a4cc6512b4a7d7811c21051c346ac9634cae9c86fe737c1ff08c112af57)
- October 21, 2005: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/41/d3/41d3913ccb3569541b246d0ef88de0f4a44ae4dd6b6e19d28b09bda79ec0d2c8)

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