# STC SR04422CH

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: National Aircraft Service Inc, United States
- Description: Installation of NASI NTEC36TM Cooling System in accordance with Master Data List (MDL) as listed on AML No. SR04422CH, or later FAA approved revision.
- Applied: February 1, 2018
- Status date: August 27, 2019
- Product: Aircraft
- Certification basis: Part 21, Part 23, Part 29
- Data sheets: [TCDS H2NE](https://openairdocs.org/tcds/H2NE), [TCDS H3NE](https://openairdocs.org/tcds/H3NE), [TCDS H4NE](https://openairdocs.org/tcds/H4NE), [TCDS H5NE](https://openairdocs.org/tcds/H5NE)
- Certificate PDF: https://openairdocs.org/files/sha256/af/28/af28cc3d8f080b738a6cc9f667460bffb8659e41b09f85f3ffef5a9be36ba0e6
- Approved model list and other attachments: [SR04422CH AML.pdf](https://openairdocs.org/files/sha256/8f/98/8f98800c7465d82411cbceb0c55b73238c4b49f765b6d698ba07688a8cd6a4c5)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DD2ACA4A61A7340D8625846A006EA6B1.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR04422CH

## ADs that name it (0)

None.

## Approved models (5)

- Sikorsky Aircraft Corporation S-70 ([TCDS H2NE](https://openairdocs.org/tcds/H2NE))
- Sikorsky Aircraft Corporation S-70A ([TCDS H5NE](https://openairdocs.org/tcds/H5NE))
- Sikorsky Aircraft Corporation S-70C ([TCDS H3NE](https://openairdocs.org/tcds/H3NE))
- Sikorsky Aircraft Corporation S-70C(M) ([TCDS H4NE](https://openairdocs.org/tcds/H4NE))
- Sikorsky Aircraft Corporation S-70C(M1) ([TCDS H4NE](https://openairdocs.org/tcds/H4NE))

## 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.

Part 23 of the Federal Aviation Regulations.

Original Product--Type Certificate Number *

Installation of NASI NTEC36TM Cooling System in accordance with Master Data List (MDL) as listed on AML No. SR04422CH, or later FAA approved revision.

1) The installer must determine whether this design change is compatible with previously approved modifications.

2) If the holder agrees to permit another person to use this certificate to alter a product, the holder must give the other person written evidence of that permission.

3) Rotorcraft Flight Manual Supplement (RFMS) as listed on AML number SR04422CH, or later FAA approved revision, is required on board the modified aircraft.

4) A copy of this Certificate and FAA Approved Model List (AML) No. SR04422CH, issued August 27, 2019, or later FAA approved revision, must be maintained as part of the permanent records for the modified aircraft

National Aircraft Service, Inc. (NASI) 9133 Tecumseh Clinton Hwy Tecumseh, MI 49286 * See attached Federal Aviation Administration (FAA) Approved Model List (AML) number SR04422CH for list of approved rotorcraft models and applicable airworthiness regulations.

(Signature) Steven L. Lardinois Manager, Systems Section Chicago ACO Branch

(Title)

Date of application: February 1, 2018

Date of issuance: August 27, 2019

### SR04422CH AML.pdf

Federal Aviation Administration (FAA) Approved Model List (AML) Number SR04422CH National Aircraft Service, Inc. (NASI)

FOR

Installation of NASI NTEC36TM Cooling System

Issue Date: August 27, 2019 Page 1 of 1 ITEM AIRCRAFT MAKE AIRCRAFT MODEL TCDS NO. CERTIFICATION BASIS FOR ALTERATION FAA APPROVED AIRPLANE FLIGHT MANUAL SUPPLEMENT FAA APPROVED MASTER DATA LIST AML AMENDMENT DATE Number/Rev* Date Approved Number/Rev* Date

1.

Sikorsky Aircraft Corporation S-70 (UH-60A, UH-60L) H2NE 14 CFR Part 29 thru Amendment 55 NT31RFMS, NC 12-21-2018 NT-MDL31, NC 2-27-2019 8-27-2019

2.

Sikorsky Aircraft Corporation S-70A H5NE 14 CFR Part 29 thru Amendment 55 NT31RFMS, NC 12-21-2018 NT-MDL31, NC 2-27-2019 8-27-2019

3. Sikorsky Aircraft Corporation S-70C H3NE 14 CFR Part 29 thru Amendment 55 NT31RFMS, NC 12-21-2018 NT-MDL31, NC 2-27-2019 8-27-2019

4. Sikorsky Aircraft Corporation S-70C(M1), S-70C(M) H4NE 14 CFR Part 29 thru Amendment 55 NT31RFMS, NC 12-21-2018 NT-MDL31, NC 2-27-2019 8-27-2019 *Or later FAA-Approved Revision

FAA Approved:

Steven L. Lardinois Manager, Systems Section Chicago ACO Branch

Date Issued: August 27, 2019

## Every issue (1)

- August 27, 2019: Issued, Current. [certificate](https://openairdocs.org/files/sha256/af/28/af28cc3d8f080b738a6cc9f667460bffb8659e41b09f85f3ffef5a9be36ba0e6), [SR04422CH AML.pdf](https://openairdocs.org/files/sha256/8f/98/8f98800c7465d82411cbceb0c55b73238c4b49f765b6d698ba07688a8cd6a4c5)

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