WASHINGTON, June 14 (Reuters) - Republican Senator Chuck

Grassley said Friday he is launching a new congressional

oversight inquiry into the Federal Aviation Administration and

Boeing ( BA ) after a January mid-air emergency involving a 737

MAX 9.

The probe is the latest in a series of investigations by

lawmakers since the incident. Grassley, who first probed Boeing ( BA )

safety actions in the 1990s, said Boeing ( BA ) and the FAA "must

explain how this happened and what is being done to ensure that

it does not place the lives of Americans at risk again." He

asked the FAA and Boeing ( BA ) to answer a total of 38 questions

"requesting records of safety procedures, regulatory

requirements, corrective actions (and) whistleblower

protections."