The Federal Motor Carrier Safety Administration (FMCSA), in conjunction with the Pipeline and Hazardous Materials Safety Administration (PHMSA), is issuing this safety advisory to provide notice of emergency discharge control equipment connected to and installed on cargo tank motor vehicles, which when improperly installed, do not operate correctly and can result in total loss of power to the cargo tank motor vehicle. This revised safety advisory updates and replaces the
previous advisory of the same title that was originally issued on November 25, 2015. Investigations conducted by PHMSA and the Railroad Commission of Texas identified cargo tanks in metered service transporting liquefied compressed gas to have improperly installed emergency discharge control equipment. Use of the improperly installed devices has resulted in unintentional shut down of the motor vehicle while in motion, resulting in loss of motive power, steering and braking functions.