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While climbing after takeoff; a B737-300's TCAS aural alert commanded 'descend' but the ivsi commanded a rapid climb while the descend arc was red.
| Attributes | |
| ACN | 883550 |
| Time | |
| Date | 201004 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.Airport |
| State Reference | US |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Route In Use | Vectors |
| Flight Plan | IFR |
| Component | |
| Aircraft Component | Traffic Collision Avoidance System (TCAS) |
| Person 1 | |
| Function | Captain Pilot Not Flying |
| Experience | Flight Crew Last 90 Days 132 |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Experience | Flight Crew Last 90 Days 184 |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Conflict Airborne Conflict |
Narrative:
During climbout leaving 4;500'; we were cleared to 15;000' and turned to a heading of 180 degrees. We were asked to expedite through 7;000' for traffic. I had traffic in sight during the turn. As we climbed; we received a TCAS alert; 'descend; descend.' both the captain's and first officer's ivsi showed a green arc between 3500 and 4000 climb and all red below the 3;500 climb mark. Since we were climbing at a rapid rate; we continued our climb with an increased rate complying with the ivsi and ATC instructions. After we were clear of the conflict; I asked the first officer if he saw what I did on the ivsi and he said he did. This was a very confusing situation and I'm grateful I had the traffic in sight. I felt we complied; but had confusion between the 'descend' TCAS alert and the climb indicated on the ivsi. This could have been avoided if we had leveled off and waited until we cleared traffic.
Original NASA ASRS Text
Title: While climbing after takeoff; a B737-300's TCAS aural alert commanded 'Descend' but the IVSI commanded a rapid climb while the descend arc was red.
Narrative: During climbout leaving 4;500'; we were cleared to 15;000' and turned to a heading of 180 degrees. We were asked to expedite through 7;000' for traffic. I had traffic in sight during the turn. As we climbed; we received a TCAS alert; 'Descend; descend.' Both the Captain's and First Officer's IVSI showed a green arc between 3500 and 4000 CLIMB and all red below the 3;500 climb mark. Since we were climbing at a rapid rate; we continued our climb with an increased rate complying with the IVSI and ATC instructions. After we were clear of the conflict; I asked the First Officer if he saw what I did on the IVSI and he said he did. This was a very confusing situation and I'm grateful I had the traffic in sight. I felt we complied; but had confusion between the 'Descend' TCAS alert and the climb indicated on the IVSI. This could have been avoided if we had leveled off and waited until we cleared traffic.
Data retrieved from NASA's ASRS site as of April 2012 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.