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B737 flight crew leveled off and descended during departure climb in response to a TCASII TA caused by another aircraft level 1000 ft above through which they would be climbing through.
| Attributes | |
| ACN | 515587 |
| Time | |
| Date | 200106 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : slc.airport |
| State Reference | UT |
| Altitude | msl bound lower : 9700 msl bound upper : 13300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | tracon : s46.tracon |
| Operator | Other |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unk |
| Flight Phase | climbout other |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : multi engine pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 220 flight time total : 10000 flight time type : 4500 |
| ASRS Report | 515587 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | aircraft equipment : tcas other flight crewa other flight crewb |
| Consequence | faa : reviewed incident with flight crew |
| Miss Distance | vertical : 700 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The WX conditions at departure time of XA33Z were VFR (VMC) with no clouds and light winds. Our clearance from clearance delivery was radar vector departure, climb and maintain 10000 ft. When cleared for takeoff we were given a 280 degree heading. After liftoff we were handed off to departure control. He gave us a clearance to fly heading 310 degrees, climb and maintain FL230. Climbing through approximately 9700 ft, we received a TA alert from the TCASII. The aircraft in question was at 11000 ft on a 340 degree heading. We could not see this aircraft visually but on TCASII appeared to be right above us. I told the first officer to level at 10000 ft. He descended back down to 10000 ft from 10300 ft. We told ATC of our situation and he gave an explanation of diverging downwind traffic. We never got an RA alert from the TCASII but I believe we could have had a larger problem if we continued to climb. I asked if he could pull the tapes and give us a phone number to contact. I hope a learning situation will come out of this.
Original NASA ASRS Text
Title: B737 FLC LEVELED OFF AND DSNDED DURING DEP CLB IN RESPONSE TO A TCASII TA CAUSED BY ANOTHER ACFT LEVEL 1000 FT ABOVE THROUGH WHICH THEY WOULD BE CLBING THROUGH.
Narrative: THE WX CONDITIONS AT DEP TIME OF XA33Z WERE VFR (VMC) WITH NO CLOUDS AND LIGHT WINDS. OUR CLRNC FROM CLRNC DELIVERY WAS RADAR VECTOR DEP, CLB AND MAINTAIN 10000 FT. WHEN CLRED FOR TKOF WE WERE GIVEN A 280 DEG HDG. AFTER LIFTOFF WE WERE HANDED OFF TO DEP CTL. HE GAVE US A CLRNC TO FLY HDG 310 DEGS, CLB AND MAINTAIN FL230. CLBING THROUGH APPROX 9700 FT, WE RECEIVED A TA ALERT FROM THE TCASII. THE ACFT IN QUESTION WAS AT 11000 FT ON A 340 DEG HDG. WE COULD NOT SEE THIS ACFT VISUALLY BUT ON TCASII APPEARED TO BE RIGHT ABOVE US. I TOLD THE FO TO LEVEL AT 10000 FT. HE DSNDED BACK DOWN TO 10000 FT FROM 10300 FT. WE TOLD ATC OF OUR SIT AND HE GAVE AN EXPLANATION OF DIVERGING DOWNWIND TFC. WE NEVER GOT AN RA ALERT FROM THE TCASII BUT I BELIEVE WE COULD HAVE HAD A LARGER PROB IF WE CONTINUED TO CLB. I ASKED IF HE COULD PULL THE TAPES AND GIVE US A PHONE NUMBER TO CONTACT. I HOPE A LEARNING SIT WILL COME OUT OF THIS.
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.