O n Thursday, March 6th, the National Transportation Safety Board (NTSB) released its preliminary report about the Learjet 55 aircraft that crashed in Philadelphia, Pennsylvania.

Investigators have not yet determined what caused the Learjet 55 to nosedive seconds after takeoff on Jan. 31. The crash killed 7 people and injured 24 others.

That and the whole flight data recorder are important to find out what went wrong so it can be prevented in the future.”

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The preliminary report on the Philadelphia jet crash found the cockpit voice recorder likely hadn't recorded audio for several years.

In its investigation of a deadly Philidelphia crash, the NTSB has said that the CVR failed to record the flight and had likely not been logging audio for years.

PHILADELPHIA (WPVI) -- The National Transportation Safety Board has released its preliminary report into the Northeast Philadelphia plane crash on Jan. 31 that left seven people dead.

Authorities have released their preliminary report about the Philadelphia plane crash that killed seven people in January.

The NTSB said the CVR had likely not been recording audio for several years. The investigation is still ongoing, but the preliminary report reveals new details.

Jeff Guzzetti, a former NTSB investigator, said that the lack of a functional voice recorder would make investigating the nature and cause of the crash much more difficult — and was a violation of FAA rules for foreign air carriers.