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While the NTSB has called the electrical failures “a significant safety risk” on takeoffs and landings in low visibility, long gaps between when a safety recommendation is issued and when airlines must carry it out are not uncommon, an investigator in the Flight 731 probe said.

“I would love for it to be done immediately as a safety protocol, but that can’t happen,” said Scott Warren, team leader of an NTSB group that investigates electrical and hydraulic failures. “That puts a huge burden on the operators to ground the planes every time a safety recommendation is made. So you have to evaluate whether it makes sense to wait a month, two months, four months, or more.”