In a new public relations setback for Boeing, a quality engineer alleged shortcuts to increase production led to potentially serious structural flaws on its 787s and 777s.

A Boeing quality engineer went public Tuesday with damaging allegations that the jet-maker took manufacturing shortcuts to increase production rates that leave potentially serious structural flaws on its 787 and 777 widebody planes.

The Boeing engineer, Sam Salehpour, alleged that almost 1,000 787s and about 400 777s currently flying are at risk of premature fatigue damage and structural failure.