The Federal Aviation Administration (FAA) said on Friday it was seeking to fine Boeing Co $5.4 million, alleging it failed to prevent the installation of defective parts on 737 MAX airplanes, Reuters reported. The FAA alleged Boeing "failed to adequately oversee its suppliers to ensure they complied with the company's quality assurance system, ... Boeing knowingly submitted aircraft for final FAA airworthiness certification after determining that the parts could not be used due to a failed strength test." The FAA proposed a $3.9 million civil penalty against Boeing for the same issue in December involving 133 737 NG airplanes, which is the prior generation of the 737. The 737 MAX has been grounded since March after two fatal crashes killed 346 people. Boeing's safety record on a number of issues have come under scrutiny from lawmakers and the FAA. The parts issue is completely unrelated to the crashes, Boeing said.