By Ian Bush

By Ian Bush

PHILADELPHIA (CBS) — A series of errors by the pilots: that’s what federal investigators say is the likely cause of the crash last year in Massachusetts that claimed the lives of seven people, including Philadelphia Inquirer co-owner and philanthropist Lewis Katz.

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It’s supposed to be routine for pilots. “Before every takeoff, for whatever airplane you’re flying, a flight control check should be done,” says the NTSB’s Robert Sumwalt.

Sumwalt says those in the cockpit of the Gulfstream business jet failed to do so in all but 2 of their previous 175 flights. Had they before this trip, Sumwalt says they would have realized a wind gust locking system was still on.

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“From my perspective, it’s just plain and simple a case of pilots intentionally disregarding procedures,” Sumwalt said.

As lawyers involved in lawsuits over the crash now get their hands on the wreckage, the plane manufacturer — at the behest of the NTSB — is fixing that locking mechanism so pilots wouldn’t be able to attempt takeoff if it’s left on.

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Still, Sumwalt laments that the Federal Aviation Administration won’t be able to mandate that fix for up to a year.