WINGTIP TANK SAMPLING SYSTEM LOADING SLOT VENT VALVE AIR FLOW JET FUEL AIR Scop SS FILTER PAPER SAMPLING PROBE BULKHEAD TON CHAMBER SAMPLING PANEL ARC-3 RADIO GAS SAMPLE SYSTEM F-5 AUTO PILOT = JET FUEL ARA-8 DF CABIN PRESSURI ZATION FILTER PARTICLE SAMPLER Figure 23. F-84G sampler aircraft, CASTLE. general requirements that were later formalized by the IVY/CAST tific Director and approved by the laboratory. A new emphasis Scienn high- altitude sampling was specified by the sampling project manager such mis- sions required an aircraft capable of operating at or about 55,@00 feet (16.76 km) for at least one-half hour (Reference 29, p. 95). was made in August 1953 to use the same 15 A (one was lost during aircraft that were used in IVY and two featherweight B-36 aircr All the F-84G aircraft were rewired, fitted with new electr ecision VY) F-84G t. ics, in- cluding a new type gamma intensity rate meter, and ten were equi ped with a new gas-sampling device called a "double-squeegee." The remai ing five 135 eee