Md11 crash. UPS said in a Nov. Boeing warned of the defect in 2011 but allowed use. In the UP...

Md11 crash.  UPS said in a Nov.  Boeing warned of the defect in 2011 but allowed use.  In the UP...Md11 crash.  UPS said in a Nov.  Boeing warned of the defect in 2011 but allowed use.  In the UP...