StacksVerified U.S. regulatory reference

14 CFR §91.221

Verified against eCFR.gov as of June 20, 2026View official text on eCFR.gov ↗
  1. (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.
  2. (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.