PARIS—Almost five months after an Air France jetliner crashed in the Atlantic Ocean, the airline is warning its pilots to follow safety procedures more closely and to stop criticizing the carrier. But its pilots are bristling at what they perceive as a rebuke, saying that management is blaming them for its failure to maintain safety.

In a memo sent to all cockpit crew last week, the unit of Air France-KLM SA said a review of recent safety incidents showed that some of them occurred because pilots had disregarded basic procedures.

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