TCASII was operating while medium large transport aircraft was on short final for an ILS landing at ont. TCASII RA caused flight crew of medium large transport to miss approach and go around. Small transport jet one fourth mi behind landing on parallel runway.

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Attributes
ACN	198744
Time
Date	199201
Day	Fri
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ont
State Reference	CA
Altitude	msl bound lower : 700 msl bound upper : 700
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : ont
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	descent : approach descent other landing : go around
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 16000 flight time type : 2000
ASRS Report	198744
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : atp pilot : instrument
Events
Anomaly	conflict : airborne less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

We were doing the ILS 26R approach at ont in visual conditions. An small transport jet was close behind us on the approach to 26R. At 700 ft AGL or less we got a TA followed quickly by an RA with the command to climb. I executed a missed approach. We returned for landing 5-10 mins later with no further problem. I called the tower on the landline and they said that the small transport jet was 1/4-1/2 mi behind us. Possibly the TCASII should be turned off when doing parallel approachs to runways that are very close.

Original NASA ASRS Text

Title: TCASII WAS OPERATING WHILE MLG ACFT WAS ON SHORT FINAL FOR AN ILS LNDG AT ONT. TCASII RA CAUSED FLC OF MLG TO MISS APCH AND GAR. SMT JET ONE FOURTH MI BEHIND LNDG ON PARALLEL RWY.

Narrative: WE WERE DOING THE ILS 26R APCH AT ONT IN VISUAL CONDITIONS. AN SMT JET WAS CLOSE BEHIND US ON THE APCH TO 26R. AT 700 FT AGL OR LESS WE GOT A TA FOLLOWED QUICKLY BY AN RA WITH THE COMMAND TO CLB. I EXECUTED A MISSED APCH. WE RETURNED FOR LNDG 5-10 MINS LATER WITH NO FURTHER PROBLEM. I CALLED THE TWR ON THE LANDLINE AND THEY SAID THAT THE SMT JET WAS 1/4-1/2 MI BEHIND US. POSSIBLY THE TCASII SHOULD BE TURNED OFF WHEN DOING PARALLEL APCHS TO RWYS THAT ARE VERY CLOSE.

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.