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This certificate certifies that the change in the type design for specific aircraft models meets airworthiness requirements as per FAA regulations.
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How to fill out supplemental type certificate

How to fill out Supplemental Type Certificate
01
Gather the necessary documents and information about the aircraft modification.
02
Complete the application form for the Supplemental Type Certificate (STC).
03
Prepare supporting documentation, including engineering data and analysis.
04
Compile a description of the modification and any changes to the aircraft's performance.
05
Submit the application and documentation to the appropriate regulatory authority.
06
Respond to any requests for additional information or clarification from the regulatory authority.
07
Receive the STC approval and ensure compliance with the specified conditions.
Who needs Supplemental Type Certificate?
01
Aircraft manufacturers seeking certification for modified designs.
02
Businesses or individuals implementing significant changes to an aircraft.
03
Maintenance organizations performing alterations requiring regulatory approval.
04
Any entity needing to prove aircraft modifications meet safety and airworthiness standards.
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People Also Ask about
What is the difference between a supplemental type certificate and a 337?
An STC is an approval for a major alteration and major alterations requires a 337. If an item is a minor alteration it does not require an STC and a log book entry will do it.
How to get an STC approved?
An STC applicant submits a certification plan to the FAA that details the proposed alteration to a type-certified product and how that alteration will comply with the applicable FAA regulations and guidance material. The FAA reviews the certification plan and issues an STC project number if the plan is accepted.
What is considered a major repair in the FAA?
FAR 1 defines a Major repair as a repair that if improperly done, might appreciably affect weight, balance, structural strength, performance, powerplant operation, flight characteristics, or other qualities affecting airworthiness; or that is not done ing to accepted practices or cannot be done by elementary
What is considered a major alteration?
FAR 1 defines a major alteration as an alteration not listed in the aircraft, aircraft engine, or propeller specifications that might appreciably affect weight, balance, structural strength, performance, power plant operation, flight characteristics, or other qualities affecting airworthiness or that is not done
Is an STC always a major alteration?
Any STC is, by definition, a major alteration and also requires a 337 form.
What is a supplemental type certificate?
A supplemental type certificate ( STC ) is a type certificate ( TC ) issued when an applicant has received FAA approval to modify an aeronautical product from its original design.
What is the difference between TC and STC?
A supplemental type certificate ( STC ) is a type certificate ( TC ) issued when an applicant has received FAA approval to modify an aeronautical product from its original design.
Is an STC a major alteration?
“A Supplemental Type Certificate is an approval for a major alteration to a type certified product, i.e., an aircraft,” explained Ken Farsi, Managing Partner and President of Aerospace Design & Compliance, LLC and an FAA ODA.
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What is Supplemental Type Certificate?
A Supplemental Type Certificate (STC) is an approval granted by the aviation authority that allows for a modification to be made to an already certified aircraft or aircraft component.
Who is required to file Supplemental Type Certificate?
Any person or organization that intends to make a modification to a previously certified aircraft or aircraft component must file for a Supplemental Type Certificate.
How to fill out Supplemental Type Certificate?
To fill out a Supplemental Type Certificate application, you must provide detailed information about the modification, compliance data with regulations, and technical data demonstrating that the modification is safe and effective.
What is the purpose of Supplemental Type Certificate?
The purpose of a Supplemental Type Certificate is to ensure that any modifications to an aircraft or its components meet safety and regulatory standards after the original type certification.
What information must be reported on Supplemental Type Certificate?
The information that must be reported includes the aircraft or component details, descriptions of the proposed modifications, engineering data, safety analyses, and compliance with applicable regulations.
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