An airplane pilot who read back an inaccurate radio frequency a minute before the deadly midair crash over the Hudson River was not corrected by an air traffic controller on a personal call at the time, a safety official said Wednesday.

During testimony before a congressional committee, National Transportation Safety Board Chairwoman Deborah Hersman said the controller at Teterboro Airport gave the pilot the correct frequency for a handoff to controllers at Newark Liberty International Airport on Aug. 8.

But the frequency the pilot read back was out by one digit and the Piper pilot never made contact with controllers at Newark who were trying to warn him about potential conflict aircraft ahead, Hersman told a House Transportation and Infrastructure Committee hearing.

An animated re-creation of the crash released by the NTSB Wednesday shows the pilot of the Piper PA-32 plane was given a frequency of 127.85 to communicate with Newark controllers.

The pilot repeated back a frequency of 127.87, according to the NTSB. The Teterboro controller was on what the FAA has called a "nonbusiness" phone call at the time of the incorrect frequency call out by the pilot.