A special variant of the S901, designated the S1010 PPA, was developed specifically for use in the U-2R aircraft in the mid-1960s. This special projects full pressure suit was equipped with integrated subsystems including parachute harness, automatic flotation, redundant pressure control and breathing system, thermal protection. Custom fitted or in 12 standard sizes. Various models used in the U-2R.

• Sears, William J, A Historical Review of Partial and Full Pressure Suits, . Accessed at: http://webpages.charter.net/mcelwain/PSUITS-Chronology.htm.