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4. INSTRUMENTATION Instrumentation aboard the aircraft was a standard package to which additional instruments maybe added or removed to meet specific research objectives (Wellman et at, 1989). Table 1 is a summary of the data recorded for LOREP 1993. Pressure, temperature, dew point, and solar radiation sensors are on the exterior of the aircraft; the liquid water content sensor and cloud particle probes are under the wings. Cabin pressure is measured by a pressure transducer mounted in the data system rack. A dual system exists in case of a transducer failure. The de-iced inlet system of aluminum tubes, located on top of the fuselage, conducted a continuous flow of sample air, by way of Teflon tubing, through the pressurized cabin of the aircraft. The tubing exited a port at the rear of the cabin. The instruments sampled air, which had been delivered by a transfer pump, through a manifold. The excess air was exhausted either into the cabin or through a port at the rear of the plane. See Figure 2 (page 9) for the aircraft configuration. Table I. Data recorded for LOREP 1993 aboard the NOAA King Air Measurement Units Accuracy Time lllIMMSS Temperature 0 C Dew point 0 C Static Pressure mb Dynamic Pressure mb Cabin Pressure mb Solar radiation W m-2 Particle size /im Loran Latitude deg Loran Longitude deg GPS Latitude deg GPS Longitude deg Heading deg True Air Speed m S.l Wind direction deg Wind speed m S.l Liquid Water Content g m-3 SF 6 pptv Cloud particles 11m :f:0.5 second :f:0.250C plus 0.5% of the temperature in oC. :f:0.250C at +50 oC; :f:1.0 oC at -75 oC <:1:0.3% FS :f:0.4% FS :f:0.75% FS :f:5 . 0% :f:10% or 2.um :f:190 m :f:190 m :f:25 m (Spherical Error Probability) :f:25 m (Spherical Error Probability) :f:2 deg :f:5% :f:15% :f:15% :f:20% :f:15% * FS is full scale * The cloud particle probe logs images of particles that pass through a laser beam. Accuracy and precision of image size are based on a image pixel resolution of 25 11m. The accuracies listed in Table 1 for temperature, dew point, pressure, and solar radiation are 7