STC ST04444AT

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to the design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is th e property of the STC holder.

FAA Form 8110-2 (5/14) Page 1 of 3

Number: ST04444AT

This certificate issued to: Quiet Technology Aerospace 2100 N 29th Terrace Hollywood, FL 33020

Part 25 of the Federal Aviation Regulations.

Original Product – Type Certificate Number: A61NM Make: Gulfstream Aerospace LP Model: Gulfstream G280

Replacement of the inner aluminum barrel of the engine inlet cowl with a Quiet Technology Aerospace inlet barrel of carbon graphite sandwich construction in accordance with Quiet Technology Aerospace document “Bombardier Challenger 300/350 and Gulfstream G280 Inlet Cowl Inner Barrel Replacement Master Drawing List,” Report No. QTA 6301, Rev. A, dated January 4, 2019, and “Bombardier Challenger 300/350 and Gulfstream G280 Inlet Cowl Inner Barrel Replacement Assemble Procedure,” Report No. QTA 6305, Rev. A, dated July 6, 2018, or later FAA approved revisions.

The following Quiet Technology Aerospace documents are required with this installation: “Gulfstream G280 Inlet Cowl Inner Barrel Replacement Instructions for Continued Airworthiness,” QTA Ref. No. QTA G6283, Revision IR, dated February 25, 2019 and “Structural Repair Manual for the Gulfstream G280 Modified Nose Cowl Part Number CH3-NC-6300,” Report No.

QTA-6284, Rev. IR, dated April 6, 2018, or later FAA approved revisions. This modification has been determined by the FAA to be no acoustical change per 14 CFR §21.93(b).

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

(Limitations and Conditions continued on Page 3 of 3)

Date of Application: July 13, 2018 Date Reissued:

Date of Issuance: March 13, 2019 Date Amended:

Signature

Title Christina M. Underwood, Manager Atlanta Aircraft Certification Office Branch

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to t he design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is th e property of the STC holder.

FAA Form 8110-2 (5/14) Page 2 of 3

Transfer the ownership of Supplemental Type Certificate Number: ST04444AT

To (Name and address of transferee)

From (Name and address of grantor)

United States of America Department of Transportation Federal Aviation Administration Supplemental Type Certificate (Continuation Sheet) Number: ST04444AT

Possession of this Su pplemental Type Certificate (STC) document by persons other than the STC holder does not constitute rights to t he design data nor to alter an aircraft, aircraft engine, or propeller. The STC’s supporting documentation (drawings, instructions, specifications, flight manual supplements, etc.) is th e property of the STC holder.

FAA Form 8110-2 (5/14) Page 3 of 3

Date of Issuance: March 13, 2019 Date Amended:

2. A copy of this certificate must be maintained as part of the permanent records for 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.

Certification Basis:

Based on 14 CFR § 21.115 and § 21.101, and the FAA policy for changes that are not significant in FAA Order 8110.48, the certification basis for this modification are as follows:

a. The type certification basis for the Gulfstream Aerospace LP model Gulfstream G280 aircraft is shown on TCDS No.

A61NM for parts not changed or not affected by the change.

b. The type certification basis for the Gulfstream Aerospace LP model Gulfstream G280 aircraft is shown on TCDS No.

A61NM for parts changed or affected by the change.

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