Mitsubishi Heavy Industries Ltd. plans to build a second aircraft parts plant in Vietnam by next summer, company officials said Friday.

The new plant will be adjacent to its existing facility in Hanoi and produce components for the Boeing 777 jumbo jet that are currently being made at Nagoya Aerospace Systems Works.

The Nagoya facility will focus on producing components for Boeing Co.'s 787 because the U.S. aircraft giant plans to expand B-787 production.

The plant in Hanoi produces components for the smaller Boeing 737 using 200 Vietnamese employees. The addition of the second plant will boost its Vietnamese payroll to about 300.