CL60 crew climbed the aircraft too high for the aircraft gross weight, got on the back side of the power curve, and with slowing airspeed, had to descend to prevent a stall in ZDV class a airspace.

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Attributes
ACN	604812
Time
Date	200401
Day	Thu
Local Time Of Day	0601 To 1200
Place
Locale Reference	navaid : hlc.vortac
State Reference	KS
Altitude	msl single value : 39000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	Challenger CL600
Operating Under FAR Part	Part 121
Flight Phase	cruise : level cruise : enroute altitude change
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zdv.artcc
Operator	common carrier : air carrier
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 100 flight time total : 15000 flight time type : 1400
ASRS Report	604812
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Experience	flight time last 90 days : 220 flight time total : 3400 flight time type : 2850
ASRS Report	604811
Events
Independent Detector	other flight crewa other flight crewb
Resolutory Action	other
Supplementary
Problem Areas	Chart Or Publication Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Situations
Publication	ACFT FLT MANUAL

Narrative:

Checked manual for ability to climb to FL390. Book said we could make it. Requested FL390, given clearance to climb to FL390 within 3-4 mins. Climbed to altitude at 1200 FPM. At altitude, had slowed below .74 mach and could not get airspeed stabilized. Kept decreasing. When green line approached indicated airspeed, requested descent back to FL350. Told to wait 4 mins and turn left. About 45-60 degrees in turn, airspeed kept dropping and told center we did not want to wait for 4 mins, needed lower now. Got clearance and flew clearance.

Original NASA ASRS Text

Title: CL60 CREW CLBED THE ACFT TOO HIGH FOR THE ACFT GROSS WT, GOT ON THE BACK SIDE OF THE PWR CURVE, AND WITH SLOWING AIRSPD, HAD TO DSND TO PREVENT A STALL IN ZDV CLASS A AIRSPACE.

Narrative: CHKED MANUAL FOR ABILITY TO CLB TO FL390. BOOK SAID WE COULD MAKE IT. REQUESTED FL390, GIVEN CLRNC TO CLB TO FL390 WITHIN 3-4 MINS. CLBED TO ALT AT 1200 FPM. AT ALT, HAD SLOWED BELOW .74 MACH AND COULD NOT GET AIRSPD STABILIZED. KEPT DECREASING. WHEN GREEN LINE APCHED INDICATED AIRSPD, REQUESTED DSCNT BACK TO FL350. TOLD TO WAIT 4 MINS AND TURN L. ABOUT 45-60 DEGS IN TURN, AIRSPD KEPT DROPPING AND TOLD CTR WE DID NOT WANT TO WAIT FOR 4 MINS, NEEDED LOWER NOW. GOT CLRNC AND FLEW CLRNC.

Data retrieved from NASA's ASRS site as of July 2007 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.