When deactivating a system for flight, what method is used instead of a warning tag?

When deactivating a system for flight, what method is used instead of a warning tag?

• A. Circuit breaker collar
• B. Circuit breaker switch
• C. Manual isolation valve
• D. Flight control disable switch

Answer: (A)

When a system is deactivated for flight, you want a method that clearly shows the system is isolated and cannot be re-energized during flight. The circuit breaker collar provides a tamper-evident, aircraft-integrated indication that the circuit is OFF, attached to the breaker itself so the status is always visible and cannot be easily overridden in flight. This makes the deactivation permanent for the duration of the flight and reduces reliance on warning tags that could be lost, damaged, or ignored mid-ops. The collar stays with the breaker and allows quick verification by crew or maintenance staff, reinforcing a safe operating state. Other options don’t fit as well: a circuit breaker switch alone could be reset unintentionally; a manual isolation valve is for fluid lines, not electrical systems; a flight control disable switch targets specific control surfaces rather than serving as a general deactivation method for a system.

When a system is deactivated for flight, you want a method that clearly shows the system is isolated and cannot be re-energized during flight. The circuit breaker collar provides a tamper-evident, aircraft-integrated indication that the circuit is OFF, attached to the breaker itself so the status is always visible and cannot be easily overridden in flight. This makes the deactivation permanent for the duration of the flight and reduces reliance on warning tags that could be lost, damaged, or ignored mid-ops. The collar stays with the breaker and allows quick verification by crew or maintenance staff, reinforcing a safe operating state. Other options don’t fit as well: a circuit breaker switch alone could be reset unintentionally; a manual isolation valve is for fluid lines, not electrical systems; a flight control disable switch targets specific control surfaces rather than serving as a general deactivation method for a system.