A modified Lockheed 10 Electra, this was the first succesful pressurized cabin A/C. Its fuselage was heavily modified from the Lockheed 10 Electra. The US Army won the Collier Trophy for it.
Pilots called it "Can't See 35" because of limited visibility from cockpit. All components except cylindrical fuselage were from Electra. Fuselage had pressure bulkhead installed just ahead of main cabin entrance door and could withstand 10 psi pressure differential. Flight deck fitted with standard Lockheed 10 equipment. In cabin area, flight test and recording instruments including manometers and manifold pressure gauges installed at test engineer's console on left side of cabin. Emergency oxygen tanks and manifold installed on right side. Windows of Electra eliminated. Tests provided Air Corps and aviation industry with useful experience in cabin pressurization and turbosuperchargers. At conclusion of tests, XC-35 set aside for preservation and later became part of Park Ridge collection. Through grant from Lockheed Aircraft Company, XC-35 partially restored by Atlantic Aviation Company of Allentown PA. Interesting aside developed when one of several exposes on Amelia Earhart insisted XC-35 was aircraft she was flying when she disappeared. When book was published, Museum received call from Lockheed asking what aircraft was being restored. Since only one XC-35 built, was no problem to explain its then current location and restoration contract.