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Altitude deviation altitude excursion leads to a potential conflict with a third aircraft after evasive action climb was initiated by TCASII RA.
| Attributes | |
| ACN | 235526 |
| Time | |
| Date | 199303 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : lgb |
| State Reference | CA |
| Altitude | msl bound lower : 4000 msl bound upper : 4800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : sna |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other descent : approach |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Small Aircraft |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors |
| Flight Plan | VFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 8500 flight time type : 3200 |
| ASRS Report | 235526 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : cfi |
| Experience | flight time last 90 days : 100 flight time total : 8300 flight time type : 100 |
| ASRS Report | 235525 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Just after leveling at 4000 ft MSL with coast approach vectoring us, I received a TCASII RA to climb. While I initiated an immediate climb, the copilot informed coast approach of our TCASII RA commanded climb deviation. At 4800 ft MSL clear of conflict was heard. As I started to initiate a descent and copilot informed coast approach, we received another TCASII RA to descend just as coast approach cleared us to 1600 ft MSL. I initiated a rapid descent to 1600 ft MSL. The traffic we received the initial climb RA on was VFR, 500 ft below us. The traffic we received the descend RA on was 1000 ft above us. In this case, if we had done nothing we would have never had an actual conflict with the traffic 500 ft below us and never caused a conflict with the traffic 1000 ft above us. However, since we never had a visual on either aircraft, we were forced to comply with the TCASII RA. After landing, coast approach informed me that they were going to file a TCASII induced altitude deviation on this event.
Original NASA ASRS Text
Title: ALTDEV ALT EXCURSION LEADS TO A POTENTIAL CONFLICT WITH A THIRD ACFT AFTER EVASIVE ACTION CLB WAS INITIATED BY TCASII RA.
Narrative: JUST AFTER LEVELING AT 4000 FT MSL WITH COAST APCH VECTORING US, I RECEIVED A TCASII RA TO CLB. WHILE I INITIATED AN IMMEDIATE CLB, THE COPLT INFORMED COAST APCH OF OUR TCASII RA COMMANDED CLB DEV. AT 4800 FT MSL CLR OF CONFLICT WAS HEARD. AS I STARTED TO INITIATE A DSCNT AND COPLT INFORMED COAST APCH, WE RECEIVED ANOTHER TCASII RA TO DSND JUST AS COAST APCH CLRED US TO 1600 FT MSL. I INITIATED A RAPID DSCNT TO 1600 FT MSL. THE TFC WE RECEIVED THE INITIAL CLB RA ON WAS VFR, 500 FT BELOW US. THE TFC WE RECEIVED THE DSND RA ON WAS 1000 FT ABOVE US. IN THIS CASE, IF WE HAD DONE NOTHING WE WOULD HAVE NEVER HAD AN ACTUAL CONFLICT WITH THE TFC 500 FT BELOW US AND NEVER CAUSED A CONFLICT WITH THE TFC 1000 FT ABOVE US. HOWEVER, SINCE WE NEVER HAD A VISUAL ON EITHER ACFT, WE WERE FORCED TO COMPLY WITH THE TCASII RA. AFTER LNDG, COAST APCH INFORMED ME THAT THEY WERE GOING TO FILE A TCASII INDUCED ALTDEV ON THIS EVENT.
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.