Helicopter pilot Jeremy Clark radioed his position seconds before smashing into an airplane over the Hudson River last month — but the doomed plane’s pilot probably never heard the call, a federal crash prober told Congress yesterday.

Stephen Altman, pilot of a single-engine Piper airplane, “likely” never heard the tour helicopter’s position report because he would have been too busy monitoring air controllers’ instructions, National Transportation Safety Board vice chairman Christopher Hart told a Senate subcommittee.

Though skies were clear on Aug. 8, Altman was being tracked by controllers from Teterboro and Newark at his request.

Listening to both towers and other pilots “would have required the pilot to be actively transmitting and receiving on two different radios at the same time,” said Hart.