On March 27, Daniel Elwell, the acting administrator of the FAA, testified before the Senate Committee on Commerce, Science, and Transportation, saying that on January 21, "Boeing submitted a proposed MCAS software enhancement to the FAA for certification. ... the FAA has tested this enhancement to the 737 MAX flight control system in both the simulator and the aircraft. The testing, which was conducted by FAA flight test engineers and flight test pilots, included aerodynamic stall situations and recovery procedures."[24] After a series of delays, the updated MCAS software was released to the FAA in May 2019.[25][26] On May 16, Boeing announced that the completed software update was awaiting approval from the FAA.[27][28] The flight software underwent 360 hours of testing on 207 flights.[29] Boeing also updated existing crew procedures.[7]