Narrative:

Lda/visual approach to runway 30L stl (medium large transport) was at 2 O'clock level landing runway 30R. Both aircraft were landing. At 800 ft, RA said to monitor vertical speed. Green band was level. I followed the vertical speed and RA was satisfied. I then let vertical speed go back to 600 ft down to get into the slot. Second RA said to climb 2500 FPM. This would have put us high in the slot at 500 ft. The first officer and I determined that the medium large transport landing on runway 30R was the RA. I did not follow the 2500 ft climb, but continued the approach and landed. FAA check rider, not qualified on the medium large transport, said that I should have followed the second RA because I could not be sure the RA was the medium large transport, although that was the blip on our TCASII. At 500 ft the RA dropped out automatically. Tower did not call any traffic. Landing was normal. I feel that the TCASII is a very good tool for the pilot. So far we have not had any training on TCASII in the simulator. About 1/3 of our fleet does not have TCASII. We have the option to turn the TCASII to TA on parallel approachs.

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Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT RECEIVED A TCASII RA DURING SHORT FINAL ON A PARALLEL APCH WITH ANOTHER ACFT AT A SLIGHTLY LOWER ALT.

Narrative: LDA/VISUAL APCH TO RWY 30L STL (MLG) WAS AT 2 O'CLOCK LEVEL LNDG RWY 30R. BOTH ACFT WERE LNDG. AT 800 FT, RA SAID TO MONITOR VERT SPD. GREEN BAND WAS LEVEL. I FOLLOWED THE VERT SPD AND RA WAS SATISFIED. I THEN LET VERT SPD GO BACK TO 600 FT DOWN TO GET INTO THE SLOT. SECOND RA SAID TO CLB 2500 FPM. THIS WOULD HAVE PUT US HIGH IN THE SLOT AT 500 FT. THE FO AND I DETERMINED THAT THE MLG LNDG ON RWY 30R WAS THE RA. I DID NOT FOLLOW THE 2500 FT CLB, BUT CONTINUED THE APCH AND LANDED. FAA CHK RIDER, NOT QUALIFIED ON THE MLG, SAID THAT I SHOULD HAVE FOLLOWED THE SECOND RA BECAUSE I COULD NOT BE SURE THE RA WAS THE MLG, ALTHOUGH THAT WAS THE BLIP ON OUR TCASII. AT 500 FT THE RA DROPPED OUT AUTOMATICALLY. TWR DID NOT CALL ANY TFC. LNDG WAS NORMAL. I FEEL THAT THE TCASII IS A VERY GOOD TOOL FOR THE PLT. SO FAR WE HAVE NOT HAD ANY TRAINING ON TCASII IN THE SIMULATOR. ABOUT 1/3 OF OUR FLEET DOES NOT HAVE TCASII. WE HAVE THE OPTION TO TURN THE TCASII TO TA ON PARALLEL APCHS.

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.