There have been two Boeing 737 MAX 8 crashes in the past year: the Lion Air crash in Indonesia back in October and the Ethiopian Airlines crash over the past weekend.
There were no survivors in either crash.
The United Kingdom, China, Singapore, Australia, Indonesia have all grounded the jets.
"The UK Civil Aviation Authority has been closely monitoring the situation, however, as we do not currently have sufficient information from the flight data recorder we have, as a precautionary measure, issued instructions to stop any commercial passenger flights from any operator arriving, departing or overflying UK airspace," the CAA said Tuesday.
The FAA issued an extended safety warning -- known as a "continued airworthiness notification"-- to international operators of the MAX 8 late Monday, with U.S. Transportation Secretary Elaine Chao adding that if it "identifies an issue that affects safety" it will "take immediate and appropriate" action.
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