 The wreckage was spread over a 2- to area; some pieces fell into the Colorado River.About $500,000 (1991 value; currently $) worth of diamonds were discovered in the wreckage; they had no role in the crash.The National Transportation Safety Board (NTSB) investigation revealed that screws had been removed from the horizontal stabilizer during maintenance the night before the accident and, following a shift change, the screws had not been replaced.