# STC SR04056CH

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Mayday Avionics Inc, United States
- Description: Installation of L-3 Communications Avionics Systems Trilogy  Electronic Standby Instrument (Model ESI-2000)
- Applied: January 30, 2014
- Status date: February 16, 2016
- Product: Aircraft, Rotorcraft
- Certification basis: Part 14, Part 21, Part 29
- Data sheets: [TCDS H10EU](https://openairdocs.org/tcds/H10EU)
- Certificate PDF: https://openairdocs.org/files/sha256/22/4f/224fa46dc45c4b7b98c55714aeee367acc43faf75fae1cd1e7658c406ade6b8a
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/50D5CFC55566B7E086257F8B006ACB92.0001
- DRS record last changed: December 6, 2025
- Page: https://openairdocs.org/stc/SR04056CH

## ADs that name it (0)

None.

## Approved models (4)

- Airbus Helicopters AS-365N2 ([TCDS H10EU](https://openairdocs.org/tcds/H10EU))
- Airbus Helicopters AS-365N3 ([TCDS H10EU](https://openairdocs.org/tcds/H10EU))
- Airbus Helicopters SA-365N ([TCDS H10EU](https://openairdocs.org/tcds/H10EU))
- Airbus Helicopters SA-365N1 ([TCDS H10EU](https://openairdocs.org/tcds/H10EU))

## 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 Page 3 for complete certification basis)

Installation of L-3 Communications Avionics Systems Trilogy™ Electronic Standby Instrument (Model ESI-2000) in accordance with Mayday Avionics Master Drawing List Document No. DB1312026, Revision C, dated December 22, 2015, 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 that person written evidence of that permission.

3. FAA approved Flight Manual Supplement, Mayday Avionics Doc. No. DB1312029, Revision IR, approved February 16, 2016, or later FAA approved revision, is required on board the modified rotorcraft.

Mayday Avionics 5500 44th St. SE Grand Rapids, MI 49512 H10EU Make : Airbus Helicopters Model: SA-365N, SA-365N1, AS-365N2, AS-365N3

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

(Title) Date of application: January 30, 2014

Date of issuance: February 16, 2016

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

Number SR04056CH Date of issuance: February 16, 2016

Certification Basis:

Based on 14 CFR §§21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8l10.48, the certification basis for the Sikorsky S-76A/B/C/D rotorcraft is as follows:

a. The type certification basis for the Airbus Helicopters SA-365N, SA-365N1, AS-365N2, AS-365N3 rotorcraft is shown on TCDS H10EU for parts not changed or not affected by this change.

b. The certification basis for the parts changed or affected by this change since the reference date of application, January 30, 2014, is based on TCDS HI0EU and §§ 14 CFR Part 29.

Based on 14 CFR §§ 21.115 and 21.l0l, and the FAA policy for significant changes in FAA Order 8ll0.48, the certification basis for the baseline modification was determined to be TCDS H10EU.

- END -

## Every issue (1)

- February 16, 2016: Issued, Current. [certificate](https://openairdocs.org/files/sha256/22/4f/224fa46dc45c4b7b98c55714aeee367acc43faf75fae1cd1e7658c406ade6b8a)

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