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<br />VIII. EXPERIMENTAL PROCEDURE <br /> <br />.., <br /> <br />The procedures for conducting the experiment involve all components <br />of the instrumentation and equi pment capab i1 ity (see section XI1), <br />but the two instrumented aircraft and the radar provide the measure- <br />ments used in the statistical evaluation. This sect'ion outlines the <br />ai rcraft operating proce'dures and the response v ari ab 1 es measured by <br />the aircraft and the MilE~s City radar. Additional information is <br />found in the Operations Plan (appendix C). <br /> <br />A. Pretreatment Pass <br /> <br />The King Air cloud physics aircraft will penetrate a visually deter- <br />mined candidate cloud at or near the -8 oC level or, if this is not <br />feasible because cloud tops are too low, within about 300 m below the <br />cloud top (nearest whole thousand feet to facilitate traffic control). <br />The Lear-jet will, at thE! same time, estimate cloud-top altitude. <br />During these maneuvers, the measurements required to determine whether <br />the cloud satisfies the experimental unit declaration criteria (see <br />section VII and table 5) will be made. <br /> <br />B. Treatment Pass <br /> <br />If the experimental unit declaration criteria (as observed by the <br />primary or backup measul"ement system) are sati sfi ed for one of the <br />acceptable cloud classes and if all of the instruments required to <br />measure the primary res!ponse variables and the final test statistics <br />are operable,* a treatmlent pass will be initiated by the Learjet at <br />300 m (1000 ft) above the King Air pretreatment-pass altitude. The <br />randomization envelope ':ontaining the instructions as to which hopper <br />will be operated (see section X and appendix D describing the double <br />randomization procedure) will not be opened until the Learjet begins <br />its approach for the cloud treatment pass. The Learjet scientist can <br />disqualify the candidate cloud anytime prior to the opening of the <br />randomization envelope if (a) he has an aircraft malfunction or (b) <br />the Learjet cannot line up for the treatment pass within 2 minutes <br />after the cloud is tentatively accepted according to the experimental <br />unit declaration criteria. However, once the randomization envelope <br /> <br />,. <br /> <br />* If any of these requir"ed instruments is known to be malfunctioning <br />prior to mission launch or prior to the treatment pass (i.e., prior <br />to opening the randomiz:Cltion envelopes), no randomized experiment <br />will be performed. <br /> <br />17 <br />