# STC SR04585NY

- Type: Supplemental type certificate
- Status: Current, Reissued
- Holder: Whelen Aerospace Technologies, United States
- Description: Replacement of Vertical and Horizontal Stabilizer Lights with LED Position/Anti-collision Lights
- Applied: January 2, 2020
- Status date: September 23, 2025
- Product: Aircraft, Rotorcraft
- Certification basis: Part 29
- Data sheets: [TCDS R00002RD](https://openairdocs.org/tcds/R00002RD)
- Certificate PDF: https://openairdocs.org/files/sha256/b0/12/b0125d33a2f94a27a18f0783d75100bff1084348559b87f7b23cb1e5ba8e8262
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID197526370720251209184954.0001
- DRS record last changed: December 19, 2025
- Page: https://openairdocs.org/stc/SR04585NY

## ADs that name it (0)

None.

## Approved models (1)

- Leonardo S.p.a. AW139 ([TCDS R00002RD](https://openairdocs.org/tcds/R00002RD))

## 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.

SR04585NY Whelen Aerospace Technologies 51 Winthrop Road Chester, CT 06412 29 Title 14 Code of Regulations R00002RD Leonardo S.p.a AW139

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

(Limitations and Conditions continued on page 3 of 3) 01/02/2020 09/23/2025 02/10/2021 Michael Linegang Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3

1. Replacement of Vertical and Horizontal Stabilizer Lights with LED Position/Anti-collision Lights in accordance with Sterling Helicopter Master Drawing List, Document No. ST-19-500-003, Rev. A, dated January 18, 2021.

(Description of Type Design Change continued on Page 3 of 3)

SR04585NY 09/23/2025 3

SR04585NY 09/23/2025 Description of Type Design Change continued:

2. Maintenance to be performed in accordance with Sterling Helicopter Instructions for Continued Airworthiness, Document No. ST-19-500-008, Rev. IR, dated January 7, 2021.

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.

Certification Basis:

Based on 14 CFR 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the FAA certification basis for the Leonardo S.p.a AW139 series aircraft modification is as follows:

a. The type certification basis for the series Leonardo S.p.a AW139 aircraft is shown on TCDS R00002RD for parts not changed or not affected by the change.

b. The certification basis for parts changed or affected by the change since the reference date of application January 2, 2020, is based upon part 29 as amended by Amendment 29-45 and part 36 as amended by Amendment 36-25. Based on 14 CFR §§ 21.115 and 21.101, and the FAA policy for significant changes in FAA Order 8110.48, the certification basis for this modification was determined to be: Regulations at amendment 29-0 through 29-45: 29.301, 29.303, 29.305(a)(b)(1), 29.307(a),

29.337, 29.601(a), 29.603, 29.605(a), 29.609(a), 29.613, 29.619, 29.625, 29.773(a)(2), 29.1301,

29.1309(a)(b)(c)(d), 29.1351(a)(1), 29.1385, 29.1387, 29.1389, 29.1391, 29.1393, 29.1395, 29.1397,

29.1401, 29.1431, 29.1529.

------------------------------------------------------END-------------------------------------------------- 3 3 Add Page

## Every issue (2)

- September 23, 2025: Reissued, Current. [certificate](https://openairdocs.org/files/sha256/b0/12/b0125d33a2f94a27a18f0783d75100bff1084348559b87f7b23cb1e5ba8e8262)
- February 10, 2021: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/69/6a/696a822ba50e1c061be16662be1d2c7d9e04e4904bb73fb7cc780c8fd507b2d9)

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