The union representing UPS pilots says the company’s safety culture is broken.

In the wake of the crash of UPS Flight 1354 near Alabama’s Birmingham-Shuttlesworth Airport in August, 2013, the union Wednesday took out a full-page ad in the Wall Street Journal, urging the company to call in a third party and negotiate with the pilots over safety concerns.

At the NTSB’s probable cause hearing on the crash conducted September 9, Investigator Robert Sumwalt pointed to a survey of pilots conducted by their union, The Independent Pilots Association. The survey said 88-percent of the company’s pilots fly tired because they are afraid of the repercussions of calling in sick or fatigued.

“I want you people to listen to what this is telling you,” Sumwalt said emphatically.

“The safety culture at UPS is broken,” said union spokesman Brian Gaudet. “And we want to help change that.”

But Mike Mangeot at UPS told WSB’s Pete Combs the company has already taken steps to address NTSB concerns over the crash of Flight 1354. He questioned the genuineness of the pilots request for third party talks on safety.

“Safety is our utmost priority and should not be confused with contract negotiations,” he said.