(Cebu City Philippines)
What is an aircraft alteration, and who can perform the alteration?
An aircraft alteration is usually done to improve upon a current aircraft design or performance standard. Alterations are also performed to install equipment on an aircraft for special purpose operations such as photography, crop spraying, etc.
There are minor alterations and major alterations. Follow this link to see a decision chart on how to determine what a major and minor alterations is:www.aviation-safety-bureau.com/aircraft-alteration.html
All alterations have to be performed in accordance with FAA approved data. Major alterations are usually approved by a Supplemental Type Certificate (STC).
Certificated mechanics, repair stations, and air carriers are allowed to perform aircraft alterations as long as they use FAA approved data.