# STC ST04787NY

- Type: Supplemental type certificate
- Status: Current, Issued
- Holder: Sterling Helicopter, United States
- Description: Installation of True Blue Power TFC4000 AC-to-AC Converter
- Applied: March 15, 2022
- Status date: December 1, 2022
- Product: Aircraft, Large Airplane
- Certification basis: Part 25
- Data sheets: [TCDS T00015AT](https://openairdocs.org/tcds/T00015AT), [TCDS A12EA](https://openairdocs.org/tcds/A12EA)
- Certificate PDF: https://openairdocs.org/files/sha256/24/24/2424bbeaf369380037c385a40d09ac5cc14bca1c21b282eb4f6a9049bd0023e8
- Approved model list and other attachments: [ST04787NY_AML.pdf](https://openairdocs.org/files/sha256/80/fb/80fbd688d4c298d5dae5bc9cf8f94e3605344aceff2e4ddbaf3576a590aa65ce)
- FAA DRS: https://drs.faa.gov/browse/excelExternalWindow/DRSDOCID196082095620250117155253.0001
- DRS record last changed: December 5, 2025
- Page: https://openairdocs.org/stc/ST04787NY

## ADs that name it (0)

None.

## Approved models (5)

- Gulfstream Aerospace Corporation G-IV ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))
- Gulfstream Aerospace Corporation GIV-X ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))
- Gulfstream Aerospace Corporation GV ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))
- Gulfstream Aerospace Corporation GV-SP ([TCDS A12EA](https://openairdocs.org/tcds/A12EA))
- Gulfstream Aerospace Corporation GVI ([TCDS T00015AT](https://openairdocs.org/tcds/T00015AT))

## 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.

FAA Form 8110-2 (03/21) Page 1 of ___ ST04787NY Sterling Helicopter 1226 River Road Croydon, PA 19021 Title 14 Code of Federal Regulation 25 See attached FAA Approved Model List (AML) for the list of approved airplane models, applicable installation data requirements and specific limitations.

See attached FAA AML

1. Installation of True Blue Power TFC4000 AC-to-AC Converter in accordance with Sterling Helicopter Master Drawing List as listed on FAA approved model list (AML) No. ST04787NY.

2. Maintenance to be performed in accordance with Sterling Helicopter Instructions for Continued Airworthiness as listed on FAA approved model list (AML) No. ST04787NY.

1. The installer must determine whether this design change is compatilbe with previoulsy approved modifications.

2. If the holder agrees to permit another person to use this certificate to alter a product, the holder must give this person written evidence of that permission. (continued to page 3/3) 5/15/22 12/1/22 01/16/2025 Christina M. Underwood Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service 3

3. The FAA approved Airworthiness Limitations Section of the Instructions for Continued Airworthiness referenced in the Description of the Type Design Section of this STC is mandatory.

4. This STC replaces legacy GE Aviation Systems LLC. converter Part Nos. 717220-1, 717220-2, 717220-2R, and Avionics Instruments LLC. converter Part Nos. 1-002-0102-2444, 1-002-0102-2052 and requires that one of these parts be previously installed for the aircraft to be eligible for modification under this STC.

NOTE: If installing on a Gulfstream model GIV, then Gulfstream Aircraft Service Change (ASC) # ASC-482 must be applied. If installing on a Gulfstream model GV, then Gulfstream ASC-191A must be applied. If installing on a Gulfstream model GV-SP(G550), early serial numbers, between serial number 5001 - 5068, excluding 5003, then Gulfstream ASC-102A must be applied.

5. A copy of this certificate and the FAA approved Model List (AML) No. ST04787NY amended January 16, 2025, must be maintained as part of the permanent records for the modified aircraft.

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 bases for the Gulfstream Aerospace Corporation Models GIV, GIV-X, GV, GV-SP and GVI series aircraft modification are as follows:

(a) The Type Certification basis for the models series as shown on the FAA approved model list (AML) No. STC ST04787NY for parts not changed or not affected by the change.

(b) The Type Certification basis for the model series as shown on the FAA approved model list (AML) No. STC ST04787NY for parts changed or affected by the change.

------------------------------------------------------------------END---------------------------------------------------------------- 3 3

### ST04787NY_AML.pdf

FAA APPROVED MODEL LIST (AML) No. ST04787NY Sterling Helicopter FOR Installation of True Blue Power AC to AC Converter Original Issue Date: December 1, 2022

**REQUIRED DOCUMENTATION**

**ITEM**

**AIRCRAFT MAKE**

**AIRCRAFT MODEL**

**TCDS**

**CERTIFICATION BASIS**

**INSTALLATION INSTRUCTIONS**

**NUMBER/DATE**

**INSTRUCTIONS FOR**

**CONTINUED**

**AIRWORTHINESS**

**NUMBER/DATE AML**

**AMENDMENT DATE**

Gulfstream Aerospace Corporation

**GIV-X (G450)**

A12EA

*

Installation of True Blue Power TFC4000 AC-to-AC Converter in accordance with Sterling Helicopter Master Drawing List, Document No. ST- 22-505-02, Rev. B, dated November 14, 2024 or later FAA approved revision

Maintenance to be performed in accordance with Sterling Helicopter Instructions for Continued Airworthiness, Document No. ST-22- 505-04, Rev. A, dated November 15, 2024 or later FAA approved revision.

January 16, 2025

Gulfstream Aerospace Corporation

GV-SP (G550)

A12EA

*

January 16, 2025

Gulfstream Aerospace Corporation

**GVI (G650/G650ER)**

T00015AT

**

January 16, 2025

Gulfstream Aerospace Corporation

**GIV (G4)**

A12EA

*

January 16, 2025

Gulfstream Aerospace Corporation

GV (G5)

A12EA

*

January 16, 2025

1. Certification Basis for aircraft model with *:

a. 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 Gulfstream Aerospace Corporation Models GIV, GV-SP, GIV, GV series aircraft modification are as follows:

i. The type certification basis for the Gulfstream Aerospace Corporation Models GIV, GV-SP, GIV, GV is shown on TCDS A12EA.

ii. Regulations at amendment 25-0 through 25-144:

25.301 [Amdt. 25-23], 25.303 [Amdt. 25-23], 25.305 [Amdt.25-86], 25.1301 [Amdt. 25-0],

25.1307(c) [Amdt. 25-72], 25.1309(a) [Amdt. 25-41], 25.1351(a)(1)(2) [Amdt. 25-72], 25.1529 [Amdt. 25-54], 25.1353(a)(d)(1)(2)(3) [Amdt. 25-113], 25.1357(a)(b)(c) [Amdt. 25-0], 25 Appx.

H 25.1 [Amdt. 25-54], 25 Appx. H 25.2 [Amdt. 25-54], 25 Appx. H 25.3 [Amdt. 25-54], 25 Appx.

H 25.4 [Amdt. 25-54}

Equivalent Levels of Safety (ELOS):

ELOS Memorandum No. TC8700AT-T-S-9, Rev. 1, Equipment, Systems, and Installation Requirements: Use of ARAC Recommendations, in lieu of 14 CFR 25.1301(b)(c) and 25.1309(a).

2. Certification Basis for aircraft model with *:

a. 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 Gulfstream Aerospace Corporation Models GVI series aircraft modification are as follows:

i. The type certification basis for the Gulfstream Aerospace Corporation Models GVI is shown on TCDS T00015AT.

ii. Regulations at amendment 25-0 through 25-144:

25.301 [Amdt. 25-23], 25.303 [Amdt. 25-23], 25.305 [Amdt.25-86], 25.1301 [Amdt. 25-0],

25.1307(c) [Amdt. 25-72], 25.1309(a) [Amdt. 25-41], 25.1351(a)(1)(2) [Amdt. 25-72], 25.1529 [Amdt. 25-54], 25.1353(a)(d)(1)(2)(3) [Amdt. 25-113], 25.1357(a)(b)(c) [Amdt. 25-0], 25 Appx.

H 25.1 [Amdt. 25-54], 25 Appx. H 25.2 [Amdt. 25-54], 25 Appx. H 25.3 [Amdt. 25-54], 25 Appx.

H 25.4 [Amdt. 25-54}

Equivalent Levels of Safety (ELOS):

ELOS Memorandum No. TC8700AT-T-S-9, Rev. 1, Equipment, Systems, and Installation Requirements: Use of ARAC Recommendations, in lieu of 14 CFR 25.1301(b)(c) and 25.1309(a).

FAA Approved:

Christina Underwood Manager, East Certification Branch Compliance & Airworthiness Division Aircraft Certification Service

## Every issue (2)

- December 1, 2022: Issued, Current. [certificate](https://openairdocs.org/files/sha256/24/24/2424bbeaf369380037c385a40d09ac5cc14bca1c21b282eb4f6a9049bd0023e8), [ST04787NY_AML.pdf](https://openairdocs.org/files/sha256/80/fb/80fbd688d4c298d5dae5bc9cf8f94e3605344aceff2e4ddbaf3576a590aa65ce)
- December 1, 2022: Issued, Historical. [certificate](https://openairdocs.org/files/sha256/79/ae/79aee038bc086d1f2dafaaf811eb631ee363c42916816933bfbf044617f7d03b)

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