Narrative:

Aircraft X, a B737 on approach (ILS) to burbank airport received a TCASII resolution to climb when on a 5 mi final. He later indicated that he received an alert on traffic 500 ft below him. There was no target on the radar. He climbed into aircraft at 4000 ft, aircraft Y a C402. Aircraft X climbed from 3000 ft on the ILS. Targets merged at 4000 ft and 4100 ft. Aircraft X continued climb and came within 500 ft/0 mi of another aircraft, aircraft Z a BE99 on vectors. I issued evasive vectors and climbs to both aircraft. All aircraft were IFR in the clouds. The C402 lost 1000 ft altitude due to wake turbulence from B737. Supplemental information from acn 390696: on final approach to bur runway 8 ILS, IMC at 3000 ft MSL. Just before (1/2 mi) the OM, we got a TCASII TA. Target was '-500 ft' at 12 O'clock position, 1/2 mi. Got a second TA in about 3-5 seconds and then an RA (climb). Target showed '-100 ft' at 12 O'clock position, 1/4 mi. We initiated an aggressive go around. RA/vsi commanded 3000-4000 FPM. We turned right about 20 degrees and climbed to about 4500 ft MSL before leveling off. This put us in conflict with 4000 ft MSL traffic. Socal turned both aircraft to minimize conflict. There was no TA or RA with this other traffic. A telephone conversation with socal 3 days later revealed that there were 3 acrs involved with false targets at the same position, same altitude within a few mins of our aircraft. Supplemental information from acn 390843: as we approached GS intercept and ready to begin our descent we received a TA 500 ft below us from the TCASII. The captain delayed his descent on GS so as not to descend into traffic overhead van nuys/ILS FAF, however, we quickly went from a TCASII TA to an RA. Our TCASII vsi dictated a 3500-4000 FPM rate of climb to avoid traffic and a midair. We leveled off at 4500 ft instead of 4000 ft (missed approach altitude) because of the excessive rate of climb commanded by the TCASII.

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Original NASA ASRS Text

Title: AS A B737 PASSED ABEAM THE BUR ILS RWY 8 FAF, THE PIC RECEIVED TWO TCASII TA'S, THEN A TCASII RA. THE PIC EXECUTED AN EVASIVE 20 DEG R TURN AND A 4000 FPM CLB. THE B737 CAME IN CLOSE PROX TO A C402 AT 4000 FT AND A BE99 AT 5000 FT. THE CTLR DID NOT OBSERVE RADAR TFC ASSOCIATED WITH THE TCASII TA RA. THE B737 PIC CALLED THE FAA 3 DAYS LATER AND STATES THE SUPVR TOLD HIM THE FAA HAD ADDITIONAL INCIDENTS INVOLVING FALSE TARGETS IN THE SAME AREA AND ALT, WITHIN MINS OF HIS TCASII RA.

Narrative: ACFT X, A B737 ON APCH (ILS) TO BURBANK ARPT RECEIVED A TCASII RESOLUTION TO CLB WHEN ON A 5 MI FINAL. HE LATER INDICATED THAT HE RECEIVED AN ALERT ON TFC 500 FT BELOW HIM. THERE WAS NO TARGET ON THE RADAR. HE CLBED INTO ACFT AT 4000 FT, ACFT Y A C402. ACFT X CLBED FROM 3000 FT ON THE ILS. TARGETS MERGED AT 4000 FT AND 4100 FT. ACFT X CONTINUED CLB AND CAME WITHIN 500 FT/0 MI OF ANOTHER ACFT, ACFT Z A BE99 ON VECTORS. I ISSUED EVASIVE VECTORS AND CLBS TO BOTH ACFT. ALL ACFT WERE IFR IN THE CLOUDS. THE C402 LOST 1000 FT ALT DUE TO WAKE TURB FROM B737. SUPPLEMENTAL INFO FROM ACN 390696: ON FINAL APCH TO BUR RWY 8 ILS, IMC AT 3000 FT MSL. JUST BEFORE (1/2 MI) THE OM, WE GOT A TCASII TA. TARGET WAS '-500 FT' AT 12 O'CLOCK POS, 1/2 MI. GOT A SECOND TA IN ABOUT 3-5 SECONDS AND THEN AN RA (CLB). TARGET SHOWED '-100 FT' AT 12 O'CLOCK POS, 1/4 MI. WE INITIATED AN AGGRESSIVE GAR. RA/VSI COMMANDED 3000-4000 FPM. WE TURNED R ABOUT 20 DEGS AND CLBED TO ABOUT 4500 FT MSL BEFORE LEVELING OFF. THIS PUT US IN CONFLICT WITH 4000 FT MSL TFC. SOCAL TURNED BOTH ACFT TO MINIMIZE CONFLICT. THERE WAS NO TA OR RA WITH THIS OTHER TFC. A TELEPHONE CONVERSATION WITH SOCAL 3 DAYS LATER REVEALED THAT THERE WERE 3 ACRS INVOLVED WITH FALSE TARGETS AT THE SAME POS, SAME ALT WITHIN A FEW MINS OF OUR ACFT. SUPPLEMENTAL INFO FROM ACN 390843: AS WE APCHED GS INTERCEPT AND READY TO BEGIN OUR DSCNT WE RECEIVED A TA 500 FT BELOW US FROM THE TCASII. THE CAPT DELAYED HIS DSCNT ON GS SO AS NOT TO DSND INTO TFC OVERHEAD VAN NUYS/ILS FAF, HOWEVER, WE QUICKLY WENT FROM A TCASII TA TO AN RA. OUR TCASII VSI DICTATED A 3500-4000 FPM RATE OF CLB TO AVOID TFC AND A MIDAIR. WE LEVELED OFF AT 4500 FT INSTEAD OF 4000 FT (MISSED APCH ALT) BECAUSE OF THE EXCESSIVE RATE OF CLB COMMANDED BY THE TCASII.

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.