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<br />Page 27 <br /> <br />to 9100 ft, 10,000 ft, and 11,000 ft. Higher altitudes will <br />usually be prohibited because of the high density of air <br />traffic into and out of Phoenix. The heading direction will <br />be parallel to the wind direction at 9100 ft. A pop-up <br />sounding may be made to altitudes above 11,000 ft if FAA <br />approval can be obtained. The crest-line pass will be <br />approximately along the 45 n.mi. DME arc from the 175 to the <br />205 deg. radial, entering from either end. The approach to <br />this region will be from Happy Jack to the pivot point at <br />11,000 ft foll owed by a spi ral descent to 9100 ft to the <br />downwind side of the pivot point. A return to the Happy Jack <br />region may be made at 9600 ft. <br /> <br />The aircraft may be requested to perform the series of altitude <br />steps over either region, depending on cloud availability. The <br />aircraft may be requested to stay with one of the regions, work <br />two series of steps in one and then one in the other, work one <br />series in each and then shift to a T&D study with SF6, or any <br />other pattern speci fi ed by the Bureau ai rcraft sci enti st. A <br />series of altitude steps may be terminated whenever the <br />aircraft climbs above significant clouds and it may then <br />descend for the crest-line pass. <br />