Pilots made a number of complaints to federal authorities about the Boeing 737 MAX 8 plane months prior to Sunday’s Ethiopian Airlines crash that killed 157 people, according to a new report.

The complaints were made by pilots about flights that took place in Oct. and Nov. of 2018 and were input into a federal database, according to The Dallas Morning News.

All of the complaints were about a “safety mechanism,” which was cited in the preliminary investigative report into the Indonesia Lion Air crash in October.

The Lion Air flight — the first of the two crashes involving a MAX 8 in five months — went down on Oct. 29 off the coast of the Asian country, killing all 189 people on board.

The complaints all reference problems on MAX 8 planes with an autopilot system during takeoff, according to the report. A number of the complaints said the plane would suddenly turn nose down soon after lifting off the ground.

“The fact that this airplane requires such jury-rigging to fly is a red flag,” one of the pilots reportedly said in a complaint.

It is “unconscionable” that federal authorities and airlines continue to let pilots fly the planes without explaining how they differ from other flights, the same pilot wrote.

In a statement on Tuesday, the FAA said a review of the planes found no reason to ground all the planes of that model.

“Thus far, our review shows no systemic performance issues and provides no basis to order grounding the aircraft,” the FAA said.