The FAA does not certify, unsurprisingly, the U-2 as it is not a civil aircraft.
http://www.airweb.faa.gov/Regulatory_and_Guidance_Library/rgMakeModel.nsf/MainFr...You 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° bank.
Dead-stick ApproachHigh key point is 3000ft, 100 kn, turn into down wind leg with flaps at 25° and gear down reaching 1500ft and low key point and at 800ft turn into finals.Then extend airbrakes. Cross the threshold at 80 kn and pop the chute. The wings need to be kept level as they fly down to 10 kn.
Max. cross wind for landing is 15 kn except in emergency.
To land in 90° 32 kn gusts, fly with down wind wing low to generate a yaw moment into the wind.
Threshold speed was a function of the weight and flap deflection. It is min of 1.12 Vstall. VT+30kn is the pattern entry speed, VT+20 kn is the down wind speed, VT+10 kn at start of finals to be bleed off down the final approach.
Landing run is well over 2400 ft.
I wonder if anyone reads this

Ian