Boeing is under renewed investigation after a whistleblower alleged the company concealed defective parts from regulators, potentially installing them in 737 Max planes. 

CNN shared that according to a quality assurance employee at Boeing's Renton, Washington plant, the company moved nonconforming parts out of sight and falsified records to evade Federal Aviation Administration (FAA) detection.

In response to these allegations, Boeing stated that it received the report from Congressional investigators and is currently reviewing the claims. The company emphasized its commitment to safety, encouraging employees to report concerns. 

However, CEO Dave Calhoun is expected to face intense scrutiny during his first congressional hearing, where he plans to apologize for recent safety lapses while addressing these new allegations.

READ MORE: Boeing Banned From Producing More 737 MAX Due to Safety Concerns

Boeing's US Senate Investigations

Ahead of the upcoming testimony of Calhoun in the sante, the US subcommittee on investigations, chaired by Senator Richard Blumenthal, will examine Boeing's safety culture. 

ABC News reported that Blumenthal's prepared remarks accusing Calhoun of prioritizing profits over safety, retaliating against employees who raised concerns.

In addition to CNN's new watchdog report, he noted that his committee had heard from a dozen whistleblowers. According to VCPost, there were allegations that Boeing and Airbus used counterfeit titanium in their planes, compromising the structural integration of their products.

Adding to Boeing's legal challenges, the FAA has also mandated safety improvements before allowing normal production to resume, which has impacted airlines and raised passenger fares. 

Boeing remains banned from producing more 737 Max, but further updates are anticipated after Calhoun's senate hearing.

READ NEXT: Boeing and Airbus Allegedly Used 'Counterfeit' Titanium, FAA Investigation Reveals