Flight crew of medium large transport had TCASII RA. Climbed to clear the RA.

Attributes
ACN	194123
Time
Date	199111
Day	Mon
Local Time Of Day	1201 To 1800
Place
Locale Reference	atc facility : fak
State Reference	VA
Altitude	msl bound lower : 23000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc artcc : zla
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude descent other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : instrument pilot : flight engineer pilot : atp pilot : cfi pilot : commercial
Experience	flight time last 90 days : 200 flight time total : 16000 flight time type : 2500
ASRS Report	194123
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : flight engineer pilot : instrument
Experience	flight time last 90 days : 100 flight time total : 2500 flight time type : 700
ASRS Report	194128
Events
Anomaly	other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : took evasive action
Consequence	Other
Miss Distance	vertical : 1500
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

We were descending through FL240 to FL230 and turning right to go direct to the flat rock VOR when we got an RA on our TCASII. It called for an immediate climb. I climbed back up to FL250 where we got the 'clear of conflict' message. We notified ATC immediately and then descended back down to FL230, the altitude we were cleared to descend to. There was an large transport directly below us. I suspect that large transport was climbing to FL220 while we were descending to FL230. We were descending about 1500 FPM, and if they were climbing at that rate, that could have triggered the RA. This is just a possibility because I don't know what altitude the large transport was at.

Original NASA ASRS Text

Title: FLC OF MLG HAD TCASII RA. CLBED TO CLR THE RA.

Narrative: WE WERE DSNDING THROUGH FL240 TO FL230 AND TURNING R TO GO DIRECT TO THE FLAT ROCK VOR WHEN WE GOT AN RA ON OUR TCASII. IT CALLED FOR AN IMMEDIATE CLB. I CLBED BACK UP TO FL250 WHERE WE GOT THE 'CLR OF CONFLICT' MESSAGE. WE NOTIFIED ATC IMMEDIATELY AND THEN DSNDED BACK DOWN TO FL230, THE ALT WE WERE CLRED TO DSND TO. THERE WAS AN LGT DIRECTLY BELOW US. I SUSPECT THAT LGT WAS CLBING TO FL220 WHILE WE WERE DSNDING TO FL230. WE WERE DSNDING ABOUT 1500 FPM, AND IF THEY WERE CLBING AT THAT RATE, THAT COULD HAVE TRIGGERED THE RA. THIS IS JUST A POSSIBILITY BECAUSE I DON'T KNOW WHAT ALT THE LGT WAS AT.

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.