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Flight crew of a B737-400 avoids conflict with another air carrier by taking timely avoidance action in descent and thereby preventing a TA RA from being generated via TCASII.
| Attributes | |
| ACN | 420188 |
| Time | |
| Date | 199811 |
| Day | Wed |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : smo |
| State Reference | CA |
| Altitude | msl bound lower : 9700 msl bound upper : 9700 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 121 |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 250 flight time total : 12750 flight time type : 4550 |
| ASRS Report | 420188 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | other |
Narrative:
On sadde 6 arrival runway 24R lax, socal 124.5 told us to descend to 7000 ft. We were at 12000 ft at 250 KTS around sadde. After turn inbound to bayst, socal called traffic at 2 O'clock position restr below us, air carrier Y at 9000 ft. We were descending through 10000 ft, had the traffic on TCASII at 10000 ft. I directed first officer to stop descent. We were cleared to 7000 ft, we stopped at 9700 ft. Air carrier Y passed directly under us. No TCASII RA nor traffic! No comment by socal. We also said nothing. After air carrier Y was clear, we continued to 7000 ft. Socal messed up -- we caught it! No harm done, no foul.
Original NASA ASRS Text
Title: FLC OF A B737-400 AVOIDS CONFLICT WITH ANOTHER ACR BY TAKING TIMELY AVOIDANCE ACTION IN DSCNT AND THEREBY PREVENTING A TA RA FROM BEING GENERATED VIA TCASII.
Narrative: ON SADDE 6 ARR RWY 24R LAX, SOCAL 124.5 TOLD US TO DSND TO 7000 FT. WE WERE AT 12000 FT AT 250 KTS AROUND SADDE. AFTER TURN INBOUND TO BAYST, SOCAL CALLED TFC AT 2 O'CLOCK POS RESTR BELOW US, ACR Y AT 9000 FT. WE WERE DSNDING THROUGH 10000 FT, HAD THE TFC ON TCASII AT 10000 FT. I DIRECTED FO TO STOP DSCNT. WE WERE CLRED TO 7000 FT, WE STOPPED AT 9700 FT. ACR Y PASSED DIRECTLY UNDER US. NO TCASII RA NOR TFC! NO COMMENT BY SOCAL. WE ALSO SAID NOTHING. AFTER ACR Y WAS CLR, WE CONTINUED TO 7000 FT. SOCAL MESSED UP -- WE CAUGHT IT! NO HARM DONE, NO FOUL.
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.