The European Aviation Safety Agency plans to send its own pilots to the U.S. to conduct flight tests of Boeing Co.'s grounded 737 Max jet before it is returned to service, it said Tuesday.

The European regulator is conducting what it calls an "independent" review of the 737 Max before it's returned to service after being grounded for almost six months since the second fatal crash involving a malfunctioning flight-control system.

"EASA intends to conduct its own test flights separate from, but in full coordination with, the FAA," Janet Northcote, an agency spokeswoman, said in an email in response to questions. "The test flights are not scheduled yet, the date will depend on the development schedule of Boeing."