First officer did n't completely load radio frequency , NTSB says . The NTSB said the FAA had no standard procedures to indicate that an aircraft had not made radio contact when electronic radar handoffs of planes occurred from one sector to the next . ` Comment: NTSB also blames air traffic controllers for not realizing problem earlier .
First officer did n't completely load radio frequency , NTSB says . Comment: NTSB also blames air traffic controllers for not realizing problem earlier .