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<br />- 32 - <br /> <br />The mounting configuration must also consider, of course, structu~al soundness <br />and influence on flight characteristics. The fact that the aircraft will be used <br />in possibly severe icing conditions must also be taken into account. <br /> <br />The complexity of maintenance and calibration procedures varies greatly from <br />instrument to instrument. It is important to emphasize that, with few exceptions, <br />cloud physics measurements from aircraft are difficult to make. Instruments in- <br />variably require continuous attention to ensure valid and accurate data. A major <br />problem is the lack of reference standards for many of the measurements. Another <br />difficult requirement for many instruments is that valid calibrations can be obtained <br />only at full aircraft velocities, that is, either in actual flight, or in wind <br />tunnels. <br /> <br />e <br /> <br />Data systems are vital parts of any instrumented aircraft. Modern technology <br />offers a wide range of options for data handling, storage, and retrieva~. The <br />selection of a particular approach must consider many factors, so that generalizations <br />are difficult to make. The references cited earlier contain some guidelines in this <br />regard. The essential point, briefly, is that the data system must be compatible <br />I <br />with the sensor complement of the aircraft in accuracy, resolution and data rate, it <br />must enable the aircraft crew to monitor the sensor outputs during flight, and it . <br />must lead to some convenient and fast data reduction system. <br />