The FAA does not certify, unsurprisingly, the U-2 as it is not a civil aircraft.
http://www.airweb.faa.gov/Regulatory_an ... enFrameSetYou need the USAF TO...-1 but how to get it!
Read some books on the U-2 from your nearest library. Apparently it was difficult and probably used spoilers and may be a chute?
Update:
from Chris Pocock,"Dragon Lady: The History of the U-2 Spyplane", ISBN 0 906 893 841
Descent procedure:
Do not reduce rpm except very slowly otherwise the engine will flame out. Do not let the airspeed increase otherwise the tail will come off.
Lower the gear; open the bleed valves as the throttle is reduced to the required power to avoid compressor surge and flameout.
Deploy wing and fuselage drag devices.
The nose gradually pitched down to maintain MN as the AP is in M hold mode.
At lower altitude reduce power to increase rate of descent.
Roll-out from turns requires as much as 30