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This document certifies that the change in the type design for a specific aircraft model 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 all necessary documents relating to the aircraft modifications.
02
Start the application process by filling out the STC application form.
03
Provide detailed drawings and specifications of the proposed modifications.
04
Include information on the aircraft type and model being modified.
05
Submit test results and data that demonstrate compliance with safety and performance standards.
06
Pay any associated fees required for processing the STC application.
07
Wait for FAA review and request any additional information if needed.
08
Once approved, receive the STC documentation and ensure it is properly filed.
Who needs Supplemental Type Certificate?
01
Aircraft manufacturers seeking to modify an existing design.
02
Repair stations performing alterations to aircraft.
03
Owners or operators planning to modify their aircraft for special purposes.
04
Design and engineering firms working on aircraft modifications.
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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 a type of approval issued by aviation regulatory authorities that allows for changes to be made to an existing type design of an aircraft, engine, or propeller.
Who is required to file Supplemental Type Certificate?
The person or organization that makes the changes or modifications to an aircraft, engine, or propeller is required to file for a Supplemental Type Certificate.
How to fill out Supplemental Type Certificate?
To fill out a Supplemental Type Certificate, applicants must provide detailed descriptions of modifications, engineering data, compliance with safety regulations, and supporting documentation as required by the regulatory authority.
What is the purpose of Supplemental Type Certificate?
The purpose of a Supplemental Type Certificate is to ensure that modifications to an aircraft meet safety standards and regulatory requirements, confirming the continued airworthiness after the changes.
What information must be reported on Supplemental Type Certificate?
Information that must be reported includes the description of the modification, relevant engineering data, a statement of compliance with airworthiness standards, and any safety assessments that were conducted.
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