Advance ‘Marine One’ take-off warnings not received before airprox with Envoy E170

Investigators are examining a loss-of-separation incident involving an Embraer 170 that occurred on August 4th near Washington National airport. Two transmissions from Marine One, advising preparation for take-off, were reportedly not received by air traffic control prior to the event. The US presidential helicopter was preparing for departure when the encounter took place with the regional jet. Concerns regarding radio transmission reliability had been raised days before this specific airprox. This situation highlights potential vulnerabilities in communication protocols surrounding operations of high-value aircraft.