Citation Flight Notes July 3, 2002 Crew: Le Hardy, Martin, Poellot, Twohy, DeMott Takeoff 175842 181300 Passing through convection 181515 Pitot nose is plugged. Pitot wing may be a little low (IAS data = 140, IAS cockpit = 150) C1 279/56 C2 235/73 182030 In dense cirrus. 182200 Into clear air 182530 On track C1-C2, FL 270. 182730 Light turbulence, in dense cirrus 182840 Pitot nose OK again. 183000 CPI finally has valid background. 183433 Lightning! 183600 Turning 5 nm short of C2. HVPS right buffer only. Will reset. 183740 HVPS hung bit, right hand side only. IAS looks good. Climbing to FL290. 184000 On track northbound, FL 290. TDL frost point = temp +3C. Plates, rosettes, small roundish particles. 184445 Reset HVPS 184700 IAS OK. In cirrus, FL 290, 15 nm from C1. 184900 Data system lock up; rebooting. 185135 Turning 185204 Data system back up. 185230 Below cirrus, @C1. 185700 Still waiting for ATC clearance to higher altitude. 185740 Climbing. HVPS reset, not working well. 190015 Level 310. 33 nm from C2, heading 180. 190110 2DC static fingers on images. CPI showing mixture of habits. 190300 Pitot nose is plugged again,; some possible plugging of CN. 190535 IAS low, then OK. Cirrus less dense at C2. 191100 Climbing to FL330 191215 On track, heading north, climbing. 191450 TDL may have ice contamination. CN plugged. 192245 Climb to FL350. 193813 Reset HVPS. CN=0, CN flow=0, TDL is too warm. TDL flow OK. Exhaust may be plugged. 193900 Some hung bits on 2dc. 194300 We’re reversing course, stuck at FL350. 194840 Still working C1-C2 line. 194940 Out of cloud, 22 nm north of C2. 195045 Advised to go to C1, then spiral down over ground site. 200000 Heading 180 for traffic. Couldn’t get clearance to spiral at western ground site. Trying for CP3 (DHP 260/75). 200230 2dc has some hung bits. Cleared to CP3 for spiral down to 19,000’. Will do at 1000 fpm. 200700 Starting spiral down. Advised after spiral to go to C3 (DHP 255/60) for spiral up, then sample a line from C3 to CP2 (DHP 265/68). 201900 23,800’, descending. Will go to C3, spiral up, then C3-CP2. 202039 -15C, large plates. 202450 19,000’, in aggregates, -10C. 202925 Descending to melt ice plugs on exhaust. 203000 Out of base of cirrus at 18,000’, flows have returned to instruments. 203630 13,000’, temp = +1.2C, in light rain. 203700 Begin spiral up. 203851 14,000’, thicker cirrus west, breaks/thin to the north. 204200 Photo looking northeast, at 17,800. 204509 20,300’, not in cirrus. 204610 Back in cirrus. TDL frost point a little warm. Columns and big plates, pristine. 204950 25,000’, in cirrus, not dense. 205400 FL300, in thin cirrus, no halo. 205540 Cirrus not uniform, good horizontal visibility to the north northeast. 205750 Leveling at FL330. ATC upper limit. 210400 Circling C3. No requests allowed by ATC. 210900 Still circling C3. 211700 Will try to go to C2 for spiral down. 211950 Told by ATC to descend before reaching C2; will return to base. 214245 Land 3.7 hours Mission Summary 1. Stepped up on line C1-C2. FL270, 290, 310, 330, 350. 2. Spiral down at CP3 to FL190. 3. Flew to C3, spiral down to 13,0000’, then spiral up to FL330.