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A B737-300 suffered a close encounter with a light aircraft while on approach to ont. TCAS and ATC gave conflicting resolution advisories and the flight crew appropriately follows those from TCAS. The vertical separation was approximated at 200 feet but no horizontal estimate was provided.
| Attributes | |
| ACN | 1056554 |
| Time | |
| Date | 201212 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ONT.Airport |
| State Reference | CA |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Initial Approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Operating Under FAR Part | Part 91 |
| Person 1 | |
| Function | First Officer |
| Experience | Flight Crew Last 90 Days 168 |
| Person 2 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict Deviation - Procedural Clearance |
| Miss Distance | Vertical 200 |
Narrative:
Eight out on localizer 26R in ont at 6;000 MSL we received a TCAS TA followed by a TCAS RA. First RA; monitor V/south. Then descend. Descend pegged at 2;000 FPM down. ATC had just pointed out traffic. He told us to climb 300 feet which we complied with. We then received the two ras which we complied with although ATC gave contrary directions to climb. We told ATC we were following the TCAS RA. The other aircraft was a low wing GA aircraft. I saw 200 feet altitude difference. We picked up the aircraft as it passed above us. After the event ended we were cleared to s-turn as needed to land 26R in ont. Rest of flight was uneventful.
Original NASA ASRS Text
Title: A B737-300 suffered a close encounter with a light aircraft while on approach to ONT. TCAS and ATC gave conflicting resolution advisories and the flight crew appropriately follows those from TCAS. The vertical separation was approximated at 200 feet but no horizontal estimate was provided.
Narrative: Eight out on Localizer 26R in ONT at 6;000 MSL we received a TCAS TA followed by a TCAS RA. First RA; monitor V/S. Then descend. Descend pegged at 2;000 FPM down. ATC had just pointed out traffic. He told us to climb 300 feet which we complied with. We then received the two RAs which we complied with although ATC gave contrary directions to climb. We told ATC we were following the TCAS RA. The other aircraft was a low wing GA aircraft. I saw 200 feet altitude difference. We picked up the aircraft as it passed above us. After the event ended we were cleared to S-turn as needed to land 26R in ONT. Rest of flight was uneventful.
Data retrieved from NASA's ASRS site as of July 2013 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.