An FAA Safety Alert For Operators has been issued for the use of tie wraps and/or collars on circuit breakers. Flightcrews may have difficulty confirming the state of certain circuit breakers believing it has “popped” when it has, in fact, been “collared” with a white tie wrap. The inverse is true for a circuit breaker that might appear to be normal, when it has been collared with a black tie wrap rendering that system inoperative or non-powered. Maintenance personnel should make every effort to use contrasting color tie wraps or circuit breaker collars when deactivating aircraft systems.