# STC SH4057NM

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Air Comm Corporation, United States
- Description: Installation of bleed air cabin heater and windshield defrost system.
- Applied: September 5, 1989
- Status date: November 24, 2014
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS H1NE](https://openairdocs.org/tcds/H1NE)
- Certificate PDF: https://openairdocs.org/files/sha256/05/09/05094b074d1d6f13a77f4fef81d0b51728f113839a6cd6a268884f0e2e67b63e
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/6D2A7FFEFBA504C686257DF80054F3C2.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SH4057NM

## ADs that name it (0)

None.

## Approved models (3)

- Sikorsky Aircraft Corporation S-76A ([TCDS H1NE](https://openairdocs.org/tcds/H1NE))
- Sikorsky Aircraft Corporation S-76B ([TCDS H1NE](https://openairdocs.org/tcds/H1NE))
- Sikorsky Aircraft Corporation S-76C ([TCDS H1NE](https://openairdocs.org/tcds/H1NE))

## 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.

United States of America Department of Transportation - Federal Aviation Administration Supplemental Type Certificate Number SH4057NM

Date of application: September 5, 1989 Date reissued: November 24, 2014 Date of issuance: October 4, 1989 Date amended: December 22, 1989; December 16, 1994;

December 31, 1997; May 14, 1998

Todd Dixon (Signature) Manager, Denver Aircraft Certification Office Northwest Mountain Region (Title)

+This certificate, issued to Air Comm Corporation 1575 124th Street Westminster, CO 80234 Title 14, Part 29 of the Code of Federal Regulations.

Original ProductType Certificate Number: H1NE Make: Sikorsky Aircraft Model: S-76A, S-76B, S-76C Description of the Type Design Change:

Installation of bleed air cabin heater and windshield defrost system in accordance with Air Comm Corporation Master Drawing List DL- S76H, Rev H; FAA approved December 15, 1994 or later FAA approved revision.

1. FAA Approved Flight Manual Supplement S76H-100, dated December 16, 1994 or later FAA approved revision is required.

2. FAA Approved Flight Manual Supplement, S76H-102, dated December 31, 1997 or later FAA approved revision is required for the S-76C without the windshield defrost system installed.

3. FAA Approved Flight Manual Supplement S76H-104, dated May 14, 1998 or later FAA approved revision is required when the windshield defrost and cockpit heater controls are common and a separate control is provided for cabin heat.

4. Approval includes Model S-76A with the Arriel engine installed in accordance with STC SH568NE

5. Approval of this change in type design applies to the model of aircraft listed above only.

6. Compatibility of this design change with previously approved alterations must be determined by the installer.

7. If the holder agrees to permit another person to use this certificate to alter the product, the holder shall give the other person written evidence of that permission.

8. A copy of this certificate and the appropriate flight manual supplement as listed above must be maintained as part of the permanent record for the altered aircraft.

## Every issue (3)

- November 24, 2014: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/05/09/05094b074d1d6f13a77f4fef81d0b51728f113839a6cd6a268884f0e2e67b63e)
- August 15, 2014: Reissued, Historical. [certificate](https://openairdocs.org/files/sha256/34/50/345002a2e30ee8336168ff9aa45a4c218a58248b3696393a8f3951f383422a65)
- May 14, 1998: Amended, Historical. [certificate](https://openairdocs.org/files/sha256/d8/94/d894130b0fd124941cc11e93064abeaf5ae2ad90ee4c7af5a5e76d6eb97b13fa)

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