Cleared to descend; a lear 31 experienced a TCAS RA with a B737 below them.

Attributes
ACN	834304
Time
Date	200905
Local Time Of Day	1201-1800
Place
Locale Reference	CUH.Airport
State Reference	OK
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Learjet 31
Operating Under FAR Part	Part 91
Flight Phase	Descent
Route In Use	Direct
Flight Plan	IFR
Aircraft 2
Operating Under FAR Part	Part 121
Flight Phase	Cruise
Route In Use	Other Unknown
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP) Flight Crew Flight Instructor Flight Crew Instrument Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 57 Flight Crew Total 10000 Flight Crew Type 1750
Person 2
Function	First Officer
Qualification	Flight Crew Instrument Flight Crew Flight Instructor Flight Crew Air Transport Pilot (ATP) Flight Crew Multiengine
Experience	Flight Crew Last 90 Days 78 Flight Crew Total 3600 Flight Crew Type 1000
Events
Anomaly	Conflict Airborne Conflict
Miss Distance	Horizontal 0 Vertical 500

Narrative:

During cruise at FL410; center issued initial descent clearance to FL360. Pilot not flying accepted clearance and both pilots confirmed. We began a descent at 1000 FPM and almost immediately received a TCAS TA. Pilot not flying reduced the scale of our TCAS display and; seeing traffic below; we reduced our descent rate to 300 FPM. We then almost immediately received a TCAS climb resolution advisory. We immediately disconnected the autopilot and maneuvered in accordance with the TCAS RA. The pilot not flying advised ATC 'TCAS climb'. Upon receiving the 'monitor vertical speed' command we leveled at 41;200 ft and were then cleared back to FL410. The 737 then queried ATC as to what happened. Controller replied; 'I had an airplane on descent'. Prior to switching frequencies we asked if we had; indeed; been cleared to FL360 before. The controller said 'yes'. We hacked the time when controller made these remarks so we could have the tapes pulled if necessary. The first officer then checked on our passengers to make certain there were no injuries during the maneuver.

Original NASA ASRS Text

Title: Cleared to descend; a Lear 31 experienced a TCAS RA with a B737 below them.

Narrative: During cruise at FL410; Center issued initial descent clearance to FL360. Pilot not flying accepted clearance and both pilots confirmed. We began a descent at 1000 FPM and almost immediately received a TCAS TA. Pilot not flying reduced the scale of our TCAS display and; seeing traffic below; we reduced our descent rate to 300 FPM. We then almost immediately received a TCAS climb resolution advisory. We immediately disconnected the autopilot and maneuvered in accordance with the TCAS RA. The pilot not flying advised ATC 'TCAS CLIMB'. Upon receiving the 'MONITOR VERTICAL SPEED' command we leveled at 41;200 FT and were then cleared back to FL410. The 737 then queried ATC as to what happened. Controller replied; 'I had an airplane on descent'. Prior to switching frequencies we asked if we had; indeed; been cleared to FL360 before. The Controller said 'yes'. We hacked the time when Controller made these remarks so we could have the tapes pulled if necessary. The First Officer then checked on our passengers to make certain there were no injuries during the maneuver.

Data retrieved from NASA's ASRS site as of April 2012 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.