Britain has asked the United States for continued logistics support services for its fleet of eight Royal Air Force C-17 transport aircraft.

The sale provision of the services would come under a proposed U.S. Foreign Military Sales contract with a value of $400 million.

The proposed deal was reported to the U.S. Congress by the U.S. Defense Security Cooperation Agency, which said the package of services had the approval of the U.S. State Department.

The proposed logistical support deal would include contract labor for sustainment engineering, on-site communications support services, quality assurance, support equipment repair, supply chain management, spares replenishment, maintenance, back shop support, centralized maintenance support/associated services, and additional spare and repair parts, publications and technical documentation.

The prime contractor for work under the award would be Boeing.

Britain's current logistic services contract for the C-17 expires in September.