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http://www.aviationweek.com/Article.asp ... 590796.xmlAirTanker is not due to take on the refueling role in its entirety for another year, in May 2014, although clearances to begin air-to-air refueling had been expected much earlier.
However, military certification authorities had been unhappy with the flight characteristics of the Cobham-designed High Speed-Variable Drag Drogue originally fitted to the hoses of the Voyager.
These were changed back to the standard Sergeant-Fletcher-designed drogue currently fitted to the VC-10 and Tristars as well as to tankers from other countries.
plus part two at
http://www.aviationweek.com/Article.asp ... 96.xml&p=2