Aircraft proving and validation tests

This regulation requires Part 135 operators to conduct proving and validation tests before using certain aircraft or authorizations in commercial service.

Proving tests require at least 25 hours of FAA-approved flights for:

• Non-turbojet aircraft requiring two pilots under VFR
• Any turbojet aircraft

These tests must include five hours at night (if operating at night), five instrument approaches (if operating IFR), and visits to a representative sample of airports the operator will use. No passengers are allowed except those necessary for testing or FAA observers, though pilot training may be conducted simultaneously.

Validation tests demonstrate the operator can safely conduct specific operations like adding new aircraft types, flying outside U.S. airspace, or obtaining special authorizations (Class II navigation, special performance operations). The FAA may accept demonstrations without actual flights if the operator can prove competence otherwise.

Both test types can be conducted together when appropriate, and the FAA may authorize deviations when full compliance isn't necessary.

*This is a plain-English summary for study only. The official 14 CFR text on this page is controlling — always read the current regulation and consult a CFI.*