A month after the first flight , however , a fault in the rudder controls forced the flight - test program to be grounded : the program was not resumed until February 2010 .
Deliveries were projected to begin by January 2011 .
A month after the first flight , however , a fault in the rudder controls forced the flight - test program to be grounded : the program was not resumed until February 2010 , and deliveries were projected to begin by January 2011 .