NEW : Pratt & Whitney says it 's ` ` involved fully with investigating . '' David and David 's wife , Joy , died in the plane crash Sunday in Nigeria . His family alleges the plane and its engines were defective . Before the crash , the company had issued a statement saying both engines had failed .
NEW : Pratt & Whitney says it 's `` cooperating fully with investigating authorities '' David Chukwunonso Allison 's wife , Joy , died in the plane crash Sunday in Nigeria . His lawsuit alleges the plane and its engines were defective . Before the crash , the pilot had issued a mayday saying both engines had failed .