On March 11, the National Transportation Safety Board issued a Safety Alert to warn pilots of low-flying aircraft about the dangers associated with unmarked towers built to record weather observations. Many Meteorological Evaluation Towers (METs) fall just below the 200-foot Federal Aviation Administration threshold for obstruction markings and can be difficult to see from the air. That's a dangerous proposition for aircraft conducting low-flight operations, including aerial applicators, emergency medical helicopters, law enforcement and other low-level activities. NAAA applauds the NTSB's actions and in particular its suggestion that the FAA institute mandatory application and marking requirements for METs under 200 feet.
