# STC SR09477RC

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Keystone Helicopter Corp., United States
- Description: Installation of Electronic Standby Instrument System (ESIS) for the Sikorski Model S-92 helicopter.
- Applied: June 4, 2009
- Status date: June 4, 2009
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS R00024BO](https://openairdocs.org/tcds/R00024BO)
- Certificate PDF: https://openairdocs.org/files/sha256/15/6a/156a4d1d0f316b065ea4a0e975b85cf7eb8134b2834acdd1ecce728a91e81d4a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/0321B797B2469C1786257670005DA4CE.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR09477RC

## ADs that name it (0)

None.

## Approved models (1)

- Sikorsky Aircraft Corporation S-92A ([TCDS R00024BO](https://openairdocs.org/tcds/R00024BO))

## 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.

Number SR09477RC This certificate issued to

Part 29 of the Regulations.

Description of Type Design Change: Installation of Electronic Standby Instrument System (ESIS) for the Sikorski Model S-92 helicopter, in accordance with Heritage Aviation Ltd.

Master Drawing List, Drawing Number SOO-14001, Revision IR, dated November 6, 2006 or later FAA approved revision. Rotorcraft Flight Manual Supplement dated January 19, 2007 or later FAA approved revision is required. Instructions for Continued Airworthiness, Heritage Aviation Ltd. Document Number SO4-74000, accepted June 7, 2006, or later accepted revision is required.

Compatibility of this design change with previously approved modifications must be determined by the installer. If the holder agrees to permit another person to use this certificate to alter a product, the holder shall give the other person written evidence of that permission.

Keystone Helicopter Corporation 110 E. Stewart Huston Drive Coatesville, PA 19320 R00024BO Make : Sikorsky Aircraft Corporation Model : S-92A

Date of application : November 21, 2005

Date of issuance : January 18, 2007

Date reissued : June 04, 2009

( Signature) Lance T. Gant, Manager Rotorcraft Certification Office Southwest Region

( Title)

FAA Form 8110-2-1(10-69) Page 2 of 2

## Every issue (1)

- June 4, 2009: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/15/6a/156a4d1d0f316b065ea4a0e975b85cf7eb8134b2834acdd1ecce728a91e81d4a)

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