FK100 flight crew responds to TCASII RA while level at FL240.

Attributes
ACN	440085
Time
Date	199906
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : stl.airport
State Reference	MO
Altitude	msl bound lower : 22500 msl bound upper : 24000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zkc.artcc
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Flight Phase	cruise : level
Flight Plan	IFR
Aircraft 2
Controlling Facilities	artcc : zkc.artcc
Operator	general aviation : corporate
Make Model Name	Gulfstream III
Operating Under FAR Part	Part 91
Flight Phase	cruise : enroute altitude change
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
ASRS Report	440084
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	440085
Events
Anomaly	altitude deviation : excursion from assigned altitude conflict : airborne critical non adherence : clearance
Independent Detector	aircraft equipment : tcas other controllera other flight crewa other flight crewb
Resolutory Action	flight crew : returned to original clearance
Supplementary
Problem Areas	ATC Human Performance Aircraft Flight Crew Human Performance
Primary Problem	ATC Human Performance
Air Traffic Incident	Operational Error

Narrative:

Approximately 28 NM northeast of stl, we got a TA while level at FL240. We had opposite direction traffic at 12 O'clock, 10 mi, 800 ft below and climbing. I called center about the traffic but don't know if they received the transmission. When the intruder was at about 5 mi we got a monitor vertical speed RA. At approximately 3 mi we got a descend RA and descended at about 2500 RPM. Center gave us a turn just as we saw the bizjet go by our right wing at about 1/4 mi. He appeared to be in a left turn away from us and slightly above us. We lost about 2000 ft during the maneuver then corrected back and informed center. I thought the descend RA came a little late and caused us to do a fairly hard pushover. However, I was certainly grateful for the TCASII. It did its job well. The first officer was flying and did an excellent job without hesitation in a time critical situation.

Original NASA ASRS Text

Title: FK100 FLC RESPONDS TO TCASII RA WHILE LEVEL AT FL240.

Narrative: APPROX 28 NM NE OF STL, WE GOT A TA WHILE LEVEL AT FL240. WE HAD OPPOSITE DIRECTION TFC AT 12 O'CLOCK, 10 MI, 800 FT BELOW AND CLBING. I CALLED CTR ABOUT THE TFC BUT DON'T KNOW IF THEY RECEIVED THE XMISSION. WHEN THE INTRUDER WAS AT ABOUT 5 MI WE GOT A MONITOR VERT SPD RA. AT APPROX 3 MI WE GOT A DSND RA AND DSNDED AT ABOUT 2500 RPM. CTR GAVE US A TURN JUST AS WE SAW THE BIZJET GO BY OUR R WING AT ABOUT 1/4 MI. HE APPEARED TO BE IN A L TURN AWAY FROM US AND SLIGHTLY ABOVE US. WE LOST ABOUT 2000 FT DURING THE MANEUVER THEN CORRECTED BACK AND INFORMED CTR. I THOUGHT THE DSND RA CAME A LITTLE LATE AND CAUSED US TO DO A FAIRLY HARD PUSHOVER. HOWEVER, I WAS CERTAINLY GRATEFUL FOR THE TCASII. IT DID ITS JOB WELL. THE FO WAS FLYING AND DID AN EXCELLENT JOB WITHOUT HESITATION IN A TIME CRITICAL SIT.

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.