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This document certifies that the change in type design for certain Cessna aircraft models meets the airworthiness requirements of the Civil Air Regulations.
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How to fill out supplemental type certificate

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How to fill out Supplemental Type Certificate

01
Gather necessary documentation such as aircraft specifications and modification details.
02
Create a detailed description of the modifications being made to the aircraft.
03
Prepare the required forms, including the Application for Supplemental Type Certificate (STC).
04
Compile and submit all technical data and engineering reports that support the application.
05
Pay the associated fees required by the aviation authority.
06
Submit the complete application package to the appropriate aviation regulatory body.
07
Respond to any requests for additional information or clarification from the authority.
08
Attend any necessary inspections or evaluations pertaining to the application.

Who needs Supplemental Type Certificate?

01
Aircraft manufacturers looking to modify existing aircraft designs.
02
Modification companies that want to implement changes to aircraft systems or structures.
03
Operators wanting to certify changes that affect the airworthiness of their aircraft.
04
Repair stations seeking to elevate their capabilities to include specialized modifications.
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People Also Ask about

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.
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.
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
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
Any STC is, by definition, a major alteration and also requires a 337 form.
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.
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.
“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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A Supplemental Type Certificate (STC) is an approval granted by aviation regulatory authorities that allows modifications to an existing FAA Type Certificate, indicating that the alterations are compliant with safety and performance standards.
Aircraft owners or operators who wish to make significant modifications to their aircraft, which may affect its airworthiness, are required to file for a Supplemental Type Certificate.
Filling out a Supplemental Type Certificate involves submitting an application to the aviation authority, providing detailed information about the modifications, and including supporting documentation that demonstrates compliance with regulatory standards.
The purpose of a Supplemental Type Certificate is to ensure that any modifications to an aircraft are safe, reliable, and conform to federal aviation regulations, maintaining the airworthiness of the aircraft.
The information reported on a Supplemental Type Certificate includes the details of the aircraft, descriptions of the modifications, engineering data, compliance with applicable airworthiness standards, and the qualifications of the personnel involved in the modifications.
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