Boeing will build six new CH-47F heavy-lift helicopters and remanufacture 22 more for the US Army in Fiscal 2014 under a contract announced on 26 December worth $618 million.

The contract signed with the Army Contracting Command includes funds for long-lead items to remanufacture 13 more Chinooks to the F-model standard in Fiscal 2015.

Boeing is in the second year of a five-year agreement to build 155 CH-47F helicopters.

The programme includes building new CH-47Fs, and replacing the fuselages and rotor systems of CH-47Ds and remanufacturing them to F-model standard.

The CH-47F adds a digital cockpit and a new airframe with reduced vibration. Honeywell is delivering more powerful T55-GA-714A turbofshaft engines for the CH-47F helicopters.

The army plans to continue operating the tandem-rotor Chinook until 2038.

Boeing builds the CH-47F in Philadelphia, Pennsylvania.