14 C.F.R. § 91.221 Traffic alert and collision avoidance system equipment and use.
Title 14 - Aeronautics and Space
(a) All airspace: U.S.-registered civil aircraft. Any traffic alert and collision avoidance system installed in a U.S.-registered civil aircraft must be approved by the Administrator. (b) Traffic alert and collision avoidance system, operation required. Each person operating an aircraft equipped with an operable traffic alert and collision avoidance system shall have that system on and operating.
Title 14: Aeronautics and Space
PART 91—GENERAL OPERATING AND FLIGHT RULES
Subpart C—Equipment, Instrument, and Certificate Requirements
§ 91.221 Traffic alert and collision avoidance system equipment and use.
