A deadly crash has forced UPS Airlines to ground a fleet of planes for inspections and possible repairs that could last through the peak delivery season, the company said Wednesday in an internal memo.

The airline grounded its McDonnell Douglas MD-11 fleet indefinitely as it works to meet Federal Aviation Administration guidelines, said the memo from UPS Airlines president Bill Moore to employees. The process was originally estimated to take weeks but is now expected to take several months.

A fiery MD-11 plane crash on Nov. 4 in Louisville, Kentucky, killed 14 people and injured at least 23 when the left engine detached during takeoff. Cargo carriers grounded their McDonnell Douglas MD-11 fleets shortly after, ahead of a directive from the FAA.

“Regarding the MD-11 fleet, Boeing’s ongoi

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