The National Transportation Safety Board on Thursday released a preliminary report on the Philadelphia plane crash in January that killed seven people that which found that the plane's cockpit voice recorder never captured audio.

The medical plane was operated by Jet Rescue Air Ambulance and carried the pilot, a copilot, a physician, a paramedic, the patient and the patient's mother. The jet was also equipped with medical equipment.

All six passengers on the plane, and a motorist near the crash site were killed. The crash also injured several others including a 10-year-old boy.

The NTSB's report also laid out a new timeline for the plane, which took off from runway 24 at Northeast Philadelphia Airport at 6:06 p.m. Its destination was the Springfield-Branson National Airport (SGF) in Springfield, Missouri, where it planned to land before continuing to Tijuana, Mexico. 

The flight only lasted one minute, according to flight tracking data, and the plane crashed onto a concrete sidewalk about three miles from the airport, NBC Philadelphia reported.

“The airplane impacted a commercial sign during its descent, and the calculated descent angle based on the height of the observed damage to the sign was about 22°,” the NTSB wrote. “The wreckage was highly fragmented. Wreckage and debris penetrated numerous homes, commercial buildings, and vehicles in the area, resulting in extensive fire and impact damage.”

The plane's crew was in communication with the air traffic control tower at the time of the accident, NTSB reported, and no distress calls were made by the crew prior to the crash.  The plane's black box also did not record audio of the crash, and likely was not recording audio for several years.

"After extensive repair and cleaning, the 30-minute-long tape-based recording medium was auditioned to determine its contents," the report read. "The [black box] did not record the accident flight and during the audition it was determined that the CVR had likely not been recording audio for several years."

The jet was also equipped with an Enhanced Ground Proximity Warning System (EGPWS), which can provide more information on the crash, but it is still being evaluated.

“The EGPWS computer, which may contain flight data in its nonvolatile memory, was shipped to the manufacturer’s facility for evaluation and to determine whether any relevant flight data could be recovered," the NTSB wrote. "At the time of the writing of this report, that evaluation was ongoing."

Misty Severi is a news reporter for Just The News. You can follow her on X for more coverage.