e iol wal (FLATHEAD) v Project 5.4 = In-Flight Participation of a B-57B~ lstlt. Harold M, Wells, Jr. Objective The objective of this test was to measure the effects of a nuclear detonation on an in-flight B-57B aircraft weapon system, Instrumentation Out of 220 channels being recorded, 9 data channels were lost for var~ ious reasons, They have been repaired, or replaced by spares. Aircraft Position in Space The JB~57B was flying at an absolute altitude of 25,630 feet, on @ 119° T heading in a 10° nose right position at H #0. Horizontal range to ground zero at H # O was 13,466 feet (aircraft traveling at 800 ft/sec). Aircraft position at time of shock arrival (H # 42.28 sec) was 44,659 feet beyond ground zero, Heading same as H £Q, altitude 25,930 feet, speed 758 ft/sec. Results Thermal: <S. Total thermal energy measured was horizontal receiver, i mp normal to a (60% £10% of allowable limit.) Gust: Total gust load at time of shock arrival was 50% £ 10% of allowable limit for the B~575, Overpressure: |