Medium large transport has TCASII RA which, if followed, would put them in the path of climbing traf...

Attributes
ACN	235836
Time
Date	199303
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : sna
State Reference	CA
Altitude	msl bound lower : 24000 msl bound upper : 25000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zla
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	climbout : intermediate altitude
Flight Plan	IFR
Aircraft 2
Operator	other
Make Model Name	Military Trainer
Flight Phase	climbout : intermediate altitude
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 : 7300 flight time type : 500
ASRS Report	235836
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	other

Narrative:

We were cleared to FL330. There was traffic displayed level at FL230. ATC advised him that he would get higher, reference us. As we climbed through FL250, center cleared the traffic from FL230 to climb to FL240. His rapid climb from FL230 to FL240 caused our TCASII to provide an RA commanding a 1000-2000 FPM descent. The RA remained until the traffic passed beneath us, and off our left side. If we had complied with the RA, we would have descended into the conflicting traffic, rather than away from the intruder. Fortunately, we recognized what was happening, and did not follow the TCASII RA command. There would seem to be marginal benefit for the traffic to climb 1000 ft considering the fact that they would have been clear (and was clear) of us within a min or 2. If the controller had waited until we were diverging, the RA would not have occurred. It would appear that, if we had not seen the TCASII screen and figured out what the problem was, the TCASII would have reduced the separation rather than enhanced. We were lucky to have had good WX, and happened to have been watching the TCASII. This could have been a bad situation if we were IMC and had followed the RA.

Original NASA ASRS Text

Title: MLG HAS TCASII RA WHICH, IF FOLLOWED, WOULD PUT THEM IN THE PATH OF CLBING TFC.

Narrative: WE WERE CLRED TO FL330. THERE WAS TFC DISPLAYED LEVEL AT FL230. ATC ADVISED HIM THAT HE WOULD GET HIGHER, REF US. AS WE CLBED THROUGH FL250, CTR CLRED THE TFC FROM FL230 TO CLB TO FL240. HIS RAPID CLB FROM FL230 TO FL240 CAUSED OUR TCASII TO PROVIDE AN RA COMMANDING A 1000-2000 FPM DSCNT. THE RA REMAINED UNTIL THE TFC PASSED BENEATH US, AND OFF OUR L SIDE. IF WE HAD COMPLIED WITH THE RA, WE WOULD HAVE DSNDED INTO THE CONFLICTING TFC, RATHER THAN AWAY FROM THE INTRUDER. FORTUNATELY, WE RECOGNIZED WHAT WAS HAPPENING, AND DID NOT FOLLOW THE TCASII RA COMMAND. THERE WOULD SEEM TO BE MARGINAL BENEFIT FOR THE TFC TO CLB 1000 FT CONSIDERING THE FACT THAT THEY WOULD HAVE BEEN CLR (AND WAS CLR) OF US WITHIN A MIN OR 2. IF THE CTLR HAD WAITED UNTIL WE WERE DIVERGING, THE RA WOULD NOT HAVE OCCURRED. IT WOULD APPEAR THAT, IF WE HAD NOT SEEN THE TCASII SCREEN AND FIGURED OUT WHAT THE PROB WAS, THE TCASII WOULD HAVE REDUCED THE SEPARATION RATHER THAN ENHANCED. WE WERE LUCKY TO HAVE HAD GOOD WX, AND HAPPENED TO HAVE BEEN WATCHING THE TCASII. THIS COULD HAVE BEEN A BAD SIT IF WE WERE IMC AND HAD FOLLOWED THE RA.

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.

Medium large transport has TCASII RA which, if followed, would put them in the path of climbing traffic.