Citation Flight Notes
July 9, 2002

Crew:  	Le Hardy, Martin, Poellot, Twohy, DeMott

175517	Takeoff. HVPS hung bit, gaps in particle images

N  DHP 249/014
O  DHP 164/016
East site at midpoint

Climbing out in intermittent light rain.
180120	Base of layer at 12,000'; thin layer.
180255	In cloud. Multiple thin layers. Dendrites. HVPS working except for gaps.
180500	Climbing through 18,000', thin cirrus above.
181000	CN out.
181400	Photo, looking 060.
181530	CN OK now - adjusted flow. Above undercast, scattered cirrus above.
182115	At N, turning, FL240. In clear air.
182650	In turn, waiting for plan from NPOL.
	Plan is to descend at 2000' steps in lower deck.
183000	Descending. 23,500' cloud top (briefly). Miami Center works down to 17,000', approach control below that.
183800	Turning, starting descent.
183933	20,700', descending, into cloud top.
184240	Clouds are layered, thin. FL200.
184535	Turn and descend.
184901	Heading 290, FL180, into cloud. Large crystals. Cloud is very thin. TDL = T + 3C.
185455	N. Turn and descend to 17,000'

Next points will be R - 270/048, and S - 279/066.

185820	Seeing A/D voltage jumps.
185940	Heading 120, 17,000'.
190305	17,000', columns, some capped.
191000	Enroute to west ground site.
191300	Thin mixed phase cloud enroute.
191500	Cloud is thickening. Needles.
1921--	R, 16,500', descending.
192430	Level at 16,000', R to S line. Still in mixed phase cloud, mostly water, -5C. Experiencing periodic voltage fluctuations in all A/D channels.
192645	In turn, descend to 15,000'
192909	Switching pumps from #3 to #2 inverter.
193030	S, back to R. HVPS seems to be working.
193300	Cm size aggregates, still some drops. T = -2.5C
193515	R. Turn and climb to 16,000'.
193900	16,000', heading 290. More water, plates at this altitude.
194415	S, turn and climb.
194730	Level 18,000', heading 110.
195230	Still in cloud. Turn and climb to FL200.
195530	Inflated de-ice boots on aircraft.
195630	R to S, at FL200.
200200	Turna dn climb. CIN, left TAT have ice buildup.
200717	Out of cloud, FL220.
201200	Will climb to FL310 to check cloud structure. Voltage fluctuations have stopped.
201350	Nice 2dc images!
201530	Still in cloud according to FSSP.
201630	(about) FL240, cloud top, overcast above.
201740	S, FL248, turn.
202218	Abeam S, heading 110, 27,800', between layers. Volts OK, TDL values too warm. Climbing to FL310. Higher cirrus is thinner at R.
202718	Turning, 30,200', in clear.
203220	FL310, close to bottom of cirrus.
203425	Photo of left pylon; ice on CIN.
203610	Photo of right pylon.
203645	Lost inverter #3.
203910 	Inverter #3 back.
203930	In cloud, 32,500'
204115	S, in cloud, FL325. Bases lower over S. Heading to R.
204250	FL330, barely in cirrus.
204930	R, FL340. Not seeing 2D images.
205044	In cirrus. Might have water in TDL.
205200	Lost inverter #3 again. Cirrus getting thicker. HVPS hung bit.
205425	Inverter #3 back on.
205510	Inverter #2 down, data system down.
205830	Reset breaker on inverter #2. On track R - S.
210030	Data system back up and recording.
210210	S, FL350, turning, in cloud.
210220	Switching pumps from #2 to #3.
201100	S, FL350
211400	FL360, in cirrus. S - R.
212030	In turn, FL360, returning to western site. In and out of cloud.
212700	ATC will not let us spiral down over site, so RTB. Cirrus bases about 31,500'
214935	Land

3.9 hours

Summary
1. Did descent legs over eastern ground site at 24, 20, 18 and 17,000'. Clouds were layered and thin.
2. Worked a mixed phase cloud over western site at 16, 15, 16, 18, 20, 22,000'. Cloud air was smooth. Picked up ice on some of the probes, had some voltage fluctuations in the data.
3. Climbed to cirrus above western site and did steps at FL310, 330, 340, 350 and 360. Good samples.