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TCAS resolution advisory causes air carrier large transport on approach at lax to deviate from assigned altitude.
| Attributes | |
| ACN | 177164 |
| Time | |
| Date | 199104 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : lax |
| State Reference | CA |
| Altitude | msl bound lower : 2500 msl bound upper : 2750 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : lax tracon : tpa |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other descent : approach descent other |
| Route In Use | approach : visual |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 13000 |
| ASRS Report | 177164 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Navigational Facility |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On base to final turn at lax runway 24R from smf to lax, our TCAS gave us an RA and instructed us to climb. We immediately started a climb and instructed approach control that we had a TCAS alert. Our assigned altitude was 2500' and we climbed to about 2750'. The controller advised us that he had VFR traffic that was not a factor and we returned immediately to 2500'. TCAS advised that alert was resolved almost as soon as climb was started. We received several other TCAS alerts during that approach from parallel traffic on runway 25. We ignored those because we had the traffic in sight. We landed with no further incidents. Supplemental information from acn 177173: traffic on TCAS showed to be less than 580' below. First officer began immediate climb while captain notified ATC. VFR traffic was not visually observed during this time.
Original NASA ASRS Text
Title: TCAS RESOLUTION ADVISORY CAUSES ACR LGT ON APCH AT LAX TO DEVIATE FROM ASSIGNED ALT.
Narrative: ON BASE TO FINAL TURN AT LAX RWY 24R FROM SMF TO LAX, OUR TCAS GAVE US AN RA AND INSTRUCTED US TO CLB. WE IMMEDIATELY STARTED A CLB AND INSTRUCTED APCH CTL THAT WE HAD A TCAS ALERT. OUR ASSIGNED ALT WAS 2500' AND WE CLBED TO ABOUT 2750'. THE CTLR ADVISED US THAT HE HAD VFR TFC THAT WAS NOT A FACTOR AND WE RETURNED IMMEDIATELY TO 2500'. TCAS ADVISED THAT ALERT WAS RESOLVED ALMOST AS SOON AS CLB WAS STARTED. WE RECEIVED SEVERAL OTHER TCAS ALERTS DURING THAT APCH FROM PARALLEL TFC ON RWY 25. WE IGNORED THOSE BECAUSE WE HAD THE TFC IN SIGHT. WE LANDED WITH NO FURTHER INCIDENTS. SUPPLEMENTAL INFO FROM ACN 177173: TFC ON TCAS SHOWED TO BE LESS THAN 580' BELOW. F/O BEGAN IMMEDIATE CLB WHILE CAPT NOTIFIED ATC. VFR TFC WAS NOT VISUALLY OBSERVED DURING THIS TIME.
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.