Unapproved aircraft parts are aircraft parts not approved by civil aviation authorities for installation on type certified aircraft. For example, the Federal Aviation Administration (FAA) defines a "standard part" as a part produced in accordance with government regulations, and it defines an "approved part" as a "standard part" that is in accordance with a specific set of criteria and specifications.
Unapproved aircraft parts are aircraft parts not approved by civil aviation authorities for installation on type certified aircraft. For example, the Federal Aviation Administration (FAA) defines a "standard part" as a part produced in accordance with government regulations, and it defines an "approved part" as a "standard part" that is in accordance with a specific set of criteria and specifications.
Source: Wikipedia "Unapproved aircraft part" · CC BY-SA 4.0
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