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Air carrier has TCASII target descending at same rate direction 2 one-half mi ahead. TCASII then fails. Missed assigned altitude, climb back up.
| Attributes | |
| ACN | 212096 |
| Time | |
| Date | 199206 |
| Day | Sun |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : phl |
| State Reference | PA |
| Altitude | msl bound lower : 6000 msl bound upper : 6000 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | tracon : phl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 15000 flight time type : 5000 |
| ASRS Report | 212096 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | other controllera other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During approach into philly I was cleared to descend to 6000 ft. I had a TCASII target at my altitude descending exactly with me 2 1/2 mi in front. While watching TCASII target the TCASII went from the advisory to 'TCASII processor failed' as the target got closer. Over concentration made me miss my descent altitude by 400 ft. At 5600 ft, philly control told me to maintain 6000 ft and 190 KTS. I then complied with the clearance. Some of the contributing factors were TCASII advisory. Over concentration on TCASII by myself and first officer. TCASII failure during an alert message. Less than 3 mi separation of aircraft in haze and clouds according to the last TCASII message.
Original NASA ASRS Text
Title: ACR HAS TCASII TARGET DSNDING AT SAME RATE DIRECTION 2 ONE-HALF MI AHEAD. TCASII THEN FAILS. MISSED ASSIGNED ALT, CLB BACK UP.
Narrative: DURING APCH INTO PHILLY I WAS CLRED TO DSND TO 6000 FT. I HAD A TCASII TARGET AT MY ALT DSNDING EXACTLY WITH ME 2 1/2 MI IN FRONT. WHILE WATCHING TCASII TARGET THE TCASII WENT FROM THE ADVISORY TO 'TCASII PROCESSOR FAILED' AS THE TARGET GOT CLOSER. OVER CONCENTRATION MADE ME MISS MY DSCNT ALT BY 400 FT. AT 5600 FT, PHILLY CTL TOLD ME TO MAINTAIN 6000 FT AND 190 KTS. I THEN COMPLIED WITH THE CLRNC. SOME OF THE CONTRIBUTING FACTORS WERE TCASII ADVISORY. OVER CONCENTRATION ON TCASII BY MYSELF AND FO. TCASII FAILURE DURING AN ALERT MESSAGE. LESS THAN 3 MI SEPARATION OF ACFT IN HAZE AND CLOUDS ACCORDING TO THE LAST TCASII MESSAGE.
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.