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Air carrier medium large transport altitude deviation overshot during descent claiming TCASII distraction and traffic watch were factors.
| Attributes | |
| ACN | 197727 |
| Time | |
| Date | 199112 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 2600 msl bound upper : 3000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other descent other |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 197727 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : required legal separation non adherence : clearance |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 0 vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
We were being vectored for approach to runway 36L T dfw and descending to 3000 MSL. Our heading was 120 degrees. About 4000 ft approach gave us a traffic call 11:30 at 2300 ft (I believe that was the altitude). About that time we got a TCASII traffic call and we saw the blip on the TCASII 1000 ft below us. About that time approach gave us a turn to 020 to intercept. Simultaneously we broke out of the clouds and saw the traffic pass under us. Moments later approach gave us the approach clearance with the instructions to maintain 3000 till established. That's when I realized the autoplt had failed to capture the altitude and we had descended to 2600 ft. Normally I am very aware of our altitude and watch carefully to make sure the autoplt is armed and captures the leveloff altitude, but with the confusion of the traffic call, TCASII, and wondering what ATC had in mind with the large turn to final, then the approach clearance I missed the autoplt not leveling off.
Original NASA ASRS Text
Title: ACR MLG ALTDEV OVERSHOT DURING DSCNT CLAIMING TCASII DISTR AND TFC WATCH WERE FACTORS.
Narrative: WE WERE BEING VECTORED FOR APCH TO RWY 36L T DFW AND DSNDING TO 3000 MSL. OUR HDG WAS 120 DEGS. ABOUT 4000 FT APCH GAVE US A TFC CALL 11:30 AT 2300 FT (I BELIEVE THAT WAS THE ALT). ABOUT THAT TIME WE GOT A TCASII TFC CALL AND WE SAW THE BLIP ON THE TCASII 1000 FT BELOW US. ABOUT THAT TIME APCH GAVE US A TURN TO 020 TO INTERCEPT. SIMULTANEOUSLY WE BROKE OUT OF THE CLOUDS AND SAW THE TFC PASS UNDER US. MOMENTS LATER APCH GAVE US THE APCH CLRNC WITH THE INSTRUCTIONS TO MAINTAIN 3000 TILL ESTABLISHED. THAT'S WHEN I REALIZED THE AUTOPLT HAD FAILED TO CAPTURE THE ALT AND WE HAD DSNDED TO 2600 FT. NORMALLY I AM VERY AWARE OF OUR ALT AND WATCH CAREFULLY TO MAKE SURE THE AUTOPLT IS ARMED AND CAPTURES THE LEVELOFF ALT, BUT WITH THE CONFUSION OF THE TFC CALL, TCASII, AND WONDERING WHAT ATC HAD IN MIND WITH THE LARGE TURN TO FINAL, THEN THE APCH CLRNC I MISSED THE AUTOPLT NOT LEVELING OFF.
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.