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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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B737-300 flight crew has near midair collision with military aircraft. They had received a TCASII RA and were told by center to maintain altitude. They responded to the RA. Had they not done so they would have had only 200 ft separation from the military aircraft. Controller said the aircraft came out of the restr area.
| Attributes | |
| ACN | 374449 |
| Time | |
| Date | 199707 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : san |
| State Reference | CA |
| Altitude | msl bound lower : 16800 msl bound upper : 17500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Military |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 170 flight time total : 8000 flight time type : 4000 |
| ASRS Report | 374449 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | airspace violation : exit conflict : nmac other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 700 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
Narrative:
We were descending from FL210 on the baret 4 arrival to san and given a heading off course to 170 degrees and an altitude of 12000 ft. I saw on TCASII traffic on our left about 9-10 O'clock and it immediately turned to an RA. The controller, ZLA, told us to stop our descent at 17000 ft. TCASII was now telling us to climb. The traffic passed under us at 16800 ft and we were at 17500 ft. The controller said the traffic came out of the restr area. I never visually saw the traffic. I feel the clearance to level at 17000 ft was unsafe because we came too close to the renegade traffic who may or may not have been in contact with the controller at ZLA (128.6). The controller said that he just popped up on his radar screen. Since san is so busy late at night, maybe there needs to be more controllers on duty for the heavy traffic around there. Callback conversation with reporter revealed the following information: reporter states that there has been no follow-up. Reporter did not file a company report. ATC indications of not knowing about the traffic seem strange if it truly was inside the restr area. Reporter did follow TCASII RA to climb and still was quite close to the traffic.
Original NASA ASRS Text
Title: B737-300 FLC HAS NMAC WITH MIL ACFT. THEY HAD RECEIVED A TCASII RA AND WERE TOLD BY CTR TO MAINTAIN ALT. THEY RESPONDED TO THE RA. HAD THEY NOT DONE SO THEY WOULD HAVE HAD ONLY 200 FT SEPARATION FROM THE MIL ACFT. CTLR SAID THE ACFT CAME OUT OF THE RESTR AREA.
Narrative: WE WERE DSNDING FROM FL210 ON THE BARET 4 ARR TO SAN AND GIVEN A HDG OFF COURSE TO 170 DEGS AND AN ALT OF 12000 FT. I SAW ON TCASII TFC ON OUR L ABOUT 9-10 O'CLOCK AND IT IMMEDIATELY TURNED TO AN RA. THE CTLR, ZLA, TOLD US TO STOP OUR DSCNT AT 17000 FT. TCASII WAS NOW TELLING US TO CLB. THE TFC PASSED UNDER US AT 16800 FT AND WE WERE AT 17500 FT. THE CTLR SAID THE TFC CAME OUT OF THE RESTR AREA. I NEVER VISUALLY SAW THE TFC. I FEEL THE CLRNC TO LEVEL AT 17000 FT WAS UNSAFE BECAUSE WE CAME TOO CLOSE TO THE RENEGADE TFC WHO MAY OR MAY NOT HAVE BEEN IN CONTACT WITH THE CTLR AT ZLA (128.6). THE CTLR SAID THAT HE JUST POPPED UP ON HIS RADAR SCREEN. SINCE SAN IS SO BUSY LATE AT NIGHT, MAYBE THERE NEEDS TO BE MORE CTLRS ON DUTY FOR THE HVY TFC AROUND THERE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: RPTR STATES THAT THERE HAS BEEN NO FOLLOW-UP. RPTR DID NOT FILE A COMPANY RPT. ATC INDICATIONS OF NOT KNOWING ABOUT THE TFC SEEM STRANGE IF IT TRULY WAS INSIDE THE RESTR AREA. RPTR DID FOLLOW TCASII RA TO CLB AND STILL WAS QUITE CLOSE TO THE TFC.
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.