These small, typically red, fabric tags are attached to components of aircraft, such as covers, pins, and other safety devices, that must be removed before the aircraft is operational. They serve as a prominent visual reminder to ground crews and pilots performing pre-flight checks. A common example is their use on pitot tube covers, which protect these critical airspeed sensors from debris and insects while the aircraft is on the ground.
Their bright color and clear wording contribute significantly to flight safety by preventing potentially catastrophic oversights. Historically, these tags evolved from simpler flags or streamers, becoming standardized for improved clarity and effectiveness. This standardization plays a vital role in consistent communication across different aircraft types and operational environments, minimizing the risk of human error.
