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Military tanker below assigned altitude had less than standard separation with air carrier X received TCASII TA RA. Evasive action taken.
| Attributes | |
| ACN | 239471 |
| Time | |
| Date | 199304 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : sac |
| State Reference | CA |
| Altitude | msl bound lower : 23000 msl bound upper : 23000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zoa |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Experimental |
| Flight Phase | cruise other |
| Route In Use | enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 220 flight time total : 23000 flight time type : 5000 |
| ASRS Report | 239471 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance non adherence : required legal separation |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 3000 vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
ZOA held air carrier X at FL230 for traffic, expect climb in 4 mins. He was talking simulcast on UHF to 'tanker Y.' about 2 mins later we got a TCASII TA ahead and to the right closing at plus 2000 ft, then decreasing to an RA for us to descend immediately when the target was plus 1000 ft. We had a visual on 2 tanker aircraft. One was above, the lead was about 500 ft lower. We descended 300 ft as the target passed indicating plus 1200 ft. We only had 1 TCASII target. The lead aircraft passed off our right about 500 ft above us since we had gone down 300 ft. We couldn't hear any of their xmissions and center was busy giving them instructions. I advised center of the RA at first, but he didn't have time to respond.
Original NASA ASRS Text
Title: MIL TANKER BELOW ASSIGNED ALT HAD LTSS WITH ACR X RECEIVED TCASII TA RA. EVASIVE ACTION TAKEN.
Narrative: ZOA HELD ACR X AT FL230 FOR TFC, EXPECT CLB IN 4 MINS. HE WAS TALKING SIMULCAST ON UHF TO 'TANKER Y.' ABOUT 2 MINS LATER WE GOT A TCASII TA AHEAD AND TO THE R CLOSING AT PLUS 2000 FT, THEN DECREASING TO AN RA FOR US TO DSND IMMEDIATELY WHEN THE TARGET WAS PLUS 1000 FT. WE HAD A VISUAL ON 2 TANKER ACFT. ONE WAS ABOVE, THE LEAD WAS ABOUT 500 FT LOWER. WE DSNDED 300 FT AS THE TARGET PASSED INDICATING PLUS 1200 FT. WE ONLY HAD 1 TCASII TARGET. THE LEAD ACFT PASSED OFF OUR R ABOUT 500 FT ABOVE US SINCE WE HAD GONE DOWN 300 FT. WE COULDN'T HEAR ANY OF THEIR XMISSIONS AND CTR WAS BUSY GIVING THEM INSTRUCTIONS. I ADVISED CTR OF THE RA AT FIRST, BUT HE DIDN'T HAVE TIME TO RESPOND.
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.