# STC SR02748CH

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Mayday Avionics Inc, United States
- Description: Installation of a Honeywell Mark XXII Enhanced Ground Proximity Warning System (EGPWS)
- Applied: September 2, 2009
- Status date: September 2, 2009
- Product: Aircraft, Rotorcraft
- Certification basis: Part 21, Part 29
- Data sheets: [TCDS H1NE](https://openairdocs.org/tcds/H1NE)
- Certificate PDF: https://openairdocs.org/files/sha256/23/64/2364d218d94ef0a4a89f9f9b36da2756c3df4923a4e3db96f9e8306094a3ef34
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/C35315E26CAD2A4686257638006E2805.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR02748CH

## 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.

Part 29 of the Federal Aviation Regulations. (See Sheet 3 for complete certification basis)

Installation of a Honeywell Mark XXII Enhanced Ground Proximity Warning System (EGPWS) in accordance with Mayday Avionics Master Data List, Document No. E08007-3444-L001, Revision A, dated August 10, 2009, or later FAA approved revision.

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

2. FAA Approved Flight Manual Supplement, Mayday Avionics Document No. E08007-3444-B001, Revision –, approved August 14, 2009 or later FAA approved revision is required onboard the modified aircraft.

3. 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.

Mayday Avionics 5500 44th St, SE Grand Rapids, MI 49512 H1NE Make : Sikorsky Model : S-76A, S-76B, S-76C Date of application : May 29, 2008

Date of issuance : September 2, 2009

( Signature) Steven L. Lardinois Manager, Systems and Flight Test Branch Chicago Aircraft Certification Office

( Title)

FAA FORM 8110-2-1(10-69) PAGE 3 of 3 PAGES Number SR02748CH

Date of Issuance: September 2, 2009

Certification Basis (continued)

Based on 14 CFR §§ 21.101 and 21.115, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for the Sikorsky S-76A, S-76B and S-76C helicopters with the installation of the Honeywell Mark XXII Enhanced Ground Proximity Warning System (EGPWS) is as follows:

a. The type certification basis for the Sikorsky S-76A, S-76B and S-76C is shown on TCDS H1NE for parts not changed or not affected by this change.

b. The type certification basis for the parts changed or affected by this change since the reference date of application, May 29, 2008, is based upon Part 29 as amended by Amendment 29-47. Based on 14 CFR §§ 21.101 and 21.115, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be:

Applicable Regulations at the latest amendment 29-0 through 29-47

29.301(a), (b); 29.303; 29.305(a); 29.307(a); 29.561(b)(3), (c); 29.601(a); 29.603(a), (b), (c); 29.605(a); 29.609(a);

29.613(a), (b), (c), (d); 29.619(a), (b); 29.625(a); 29.1301(a), (b), (c), (d); 29.1309(b), (c), (d), (f), (g); 29.1321(g);

29.1322(a), (b), (c), (d); 29.1333(c); 29.1351(a); 29.1353(a), (b); 29.1357(a), (c); 29.1359(c); 29.1431(a), (b);

29.1501(a), (b); 29.1529; 29.1585(a) -----END----

## Every issue (1)

- September 2, 2009: Issued, Current. [certificate](https://openairdocs.org/files/sha256/23/64/2364d218d94ef0a4a89f9f9b36da2756c3df4923a4e3db96f9e8306094a3ef34)

---
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.