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While on a vector to intercept the localizer for the final approach course, an air carrier flight crew took evasive action after they received a TCASII RA for traffic approaching them at the same altitude. The approach controller had no indication or knowledge of the traffic.
| Attributes | |
| ACN | 332840 |
| Time | |
| Date | 199604 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : las |
| State Reference | NV |
| Altitude | msl bound lower : 10000 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : las |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 7200 flight time type : 150 |
| ASRS Report | 332840 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : flight engineer |
| Experience | flight time last 90 days : 100 flight time total : 10000 flight time type : 600 |
| ASRS Report | 332994 |
| Events | |
| Anomaly | conflict : nmac other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
While intercepting the runway 25R localizer our aircraft was cleared from 11000 ft to 10000 ft. While leveling at 10000 ft we received a TCASII RA of traffic at approximately the 10:30 position headed toward our aircraft at 10200 ft. The RA, vsi, and aural called for a climb, so we initiated a climb immediately back to 11000 ft while I advised approach control we were climbing in response to a TCASII RA. The traffic went directly under our aircraft on the TCASII screen but was never spotted visually by cockpit crew. Approach control had no indication or knowledge of traffic before or after we advised them of the TCASII RA. Once the traffic was clear on the TCASII we descended back to 10000 ft. Supplemental information from acn 332994: while disconnecting the autoplt and commencing an immediate climb we saw a conflicting aircraft on our screen and at our altitude (10000 ft), go rapidly by us. Our speed was 250 KTS and the other plane must have been about as fast to account for the speed that the traffic RA went by.
Original NASA ASRS Text
Title: WHILE ON A VECTOR TO INTERCEPT THE LOC FOR THE FINAL APCH COURSE, AN ACR FLC TOOK EVASIVE ACTION AFTER THEY RECEIVED A TCASII RA FOR TFC APCHING THEM AT THE SAME ALT. THE APCH CTLR HAD NO INDICATION OR KNOWLEDGE OF THE TFC.
Narrative: WHILE INTERCEPTING THE RWY 25R LOC OUR ACFT WAS CLRED FROM 11000 FT TO 10000 FT. WHILE LEVELING AT 10000 FT WE RECEIVED A TCASII RA OF TFC AT APPROX THE 10:30 POS HEADED TOWARD OUR ACFT AT 10200 FT. THE RA, VSI, AND AURAL CALLED FOR A CLB, SO WE INITIATED A CLB IMMEDIATELY BACK TO 11000 FT WHILE I ADVISED APCH CTL WE WERE CLBING IN RESPONSE TO A TCASII RA. THE TFC WENT DIRECTLY UNDER OUR ACFT ON THE TCASII SCREEN BUT WAS NEVER SPOTTED VISUALLY BY COCKPIT CREW. APCH CTL HAD NO INDICATION OR KNOWLEDGE OF TFC BEFORE OR AFTER WE ADVISED THEM OF THE TCASII RA. ONCE THE TFC WAS CLR ON THE TCASII WE DSNDED BACK TO 10000 FT. SUPPLEMENTAL INFO FROM ACN 332994: WHILE DISCONNECTING THE AUTOPLT AND COMMENCING AN IMMEDIATE CLB WE SAW A CONFLICTING ACFT ON OUR SCREEN AND AT OUR ALT (10000 FT), GO RAPIDLY BY US. OUR SPD WAS 250 KTS AND THE OTHER PLANE MUST HAVE BEEN ABOUT AS FAST TO ACCOUNT FOR THE SPD THAT THE TFC RA WENT BY.
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.