According to Reuters, the FAA issued a new safety directive Thursday for all 737 Max airplanes and other 737 variants to address a problem with decreased fire suppression capabilities.

The heart of the issue is the planes may have faulty electronic flow control of the air conditioning packs that exhaust air into the cargo from other areas. The directive prohibits operators from transporting cargo in the aircraft's belly unless the cargo is nonflammable and noncombustible.

The airworthiness directive impacts 2,204 planes worldwide and 633 registered in the US. 

The Max has had its fair share of problems since returning to the skies with American Airways in late December and other airlines in early 2021.