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Potential conflict occurs when an md-88 flight crew overshoots their altitude in descent when mishandling their FMC 60 mi east of aus, tx.
| Attributes | |
| ACN | 520890 |
| Time | |
| Date | 200108 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : aus.airport |
| State Reference | TX |
| Altitude | msl bound lower : 19000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Flight Phase | descent : intermediate altitude descent : approach |
| Route In Use | arrival : on vectors arrival star : biter 3 enroute : direct |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : multi engine pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 135 flight time total : 9897 flight time type : 5804 |
| ASRS Report | 520890 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance non adherence : required legal separation |
| Resolutory Action | controller : issued advisory flight crew : became reoriented flight crew : returned to assigned altitude other |
| Miss Distance | horizontal : 30000 vertical : 200 |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
On descent into kaus on the biter 3 arrival, we were given clearance to FL200. Passing FL220 we were cleared direct to kaus. I updated route to direct FAF thus dropping the VNAV descent path. I selected indicated airspeed, not noticing that the aircraft was already in the altitude capture mode. Altitude warning came on passing FL197.5. As I stopped the descent, center called traffic at 10 mi at FL190. Our altitude touched FL190 as I corrected back to FL200. When other aircraft came on our TCASII, they were 300 degrees below off to the left. I was back level at FL200 prior to traffic passing 2-3 mi off left side. We got TA. No RA in this event. The rest of the descent into kaus was normal. Prevention of this occurrence is always in monitoring the FMA as you touch any vertical navigation controls.
Original NASA ASRS Text
Title: POTENTIAL CONFLICT OCCURS WHEN AN MD-88 FLT CREW OVERSHOOTS THEIR ALT IN DSCNT WHEN MISHANDLING THEIR FMC 60 MI E OF AUS, TX.
Narrative: ON DSCNT INTO KAUS ON THE BITER 3 ARR, WE WERE GIVEN CLRNC TO FL200. PASSING FL220 WE WERE CLRED DIRECT TO KAUS. I UPDATED RTE TO DIRECT FAF THUS DROPPING THE VNAV DSCNT PATH. I SELECTED INDICATED AIRSPD, NOT NOTICING THAT THE ACFT WAS ALREADY IN THE ALT CAPTURE MODE. ALT WARNING CAME ON PASSING FL197.5. AS I STOPPED THE DSCNT, CTR CALLED TFC AT 10 MI AT FL190. OUR ALT TOUCHED FL190 AS I CORRECTED BACK TO FL200. WHEN OTHER ACFT CAME ON OUR TCASII, THEY WERE 300 DEGS BELOW OFF TO THE L. I WAS BACK LEVEL AT FL200 PRIOR TO TFC PASSING 2-3 MI OFF L SIDE. WE GOT TA. NO RA IN THIS EVENT. THE REST OF THE DSCNT INTO KAUS WAS NORMAL. PREVENTION OF THIS OCCURRENCE IS ALWAYS IN MONITORING THE FMA AS YOU TOUCH ANY VERTICAL NAV CTLS.
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.