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TCASII RA commanding level off was interpreted as a false warning by PIC on initial climb from departure airport.
| Attributes | |
| ACN | 200554 |
| Time | |
| Date | 199201 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : lit |
| State Reference | AR |
| Altitude | agl bound lower : 300 agl bound upper : 300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | tracon : lit tower : lit |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : takeoff climbout : initial |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 7800 flight time type : 1900 |
| ASRS Report | 200554 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | aircraft equipment problem : less severe non adherence : published procedure other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
On takeoff the TCASII system announced 'reduce climb' and the ivsi command arc indicated a level off was required. The TCASII display on the radar indicator showed a red target dead center with a '00' displayed. Crew could not identify a visual target. And aircraft remained at the takeoff altitude with a high 2000 FPM rate of climb. Departure control was questioned regarding other targets in area. Only aircraft within 30-40 mi was holding short of 4L for flow control release to dfw. A TCASII alert particularly a RA is very distracting at this stage of flight and in black air no less. Spurious TA's have occurred at dfw/katl in past but a RA with commanded level off could precipitate an accident. 'Clear of conflict' was not announced for 1-1 1/2 mins and the ivsi commanded a level off the entire time. Aircraft less than 30 days since delivery from maintenance depot.
Original NASA ASRS Text
Title: TCASII RA COMMANDING LEVEL OFF WAS INTERPRETED AS A FALSE WARNING BY PIC ON INITIAL CLB FROM DEP ARPT.
Narrative: ON TKOF THE TCASII SYS ANNOUNCED 'REDUCE CLB' AND THE IVSI COMMAND ARC INDICATED A LEVEL OFF WAS REQUIRED. THE TCASII DISPLAY ON THE RADAR INDICATOR SHOWED A RED TARGET DEAD CTR WITH A '00' DISPLAYED. CREW COULD NOT IDENT A VISUAL TARGET. AND ACFT REMAINED AT THE TKOF ALT WITH A HIGH 2000 FPM RATE OF CLB. DEP CTL WAS QUESTIONED REGARDING OTHER TARGETS IN AREA. ONLY ACFT WITHIN 30-40 MI WAS HOLDING SHORT OF 4L FOR FLOW CTL RELEASE TO DFW. A TCASII ALERT PARTICULARLY A RA IS VERY DISTRACTING AT THIS STAGE OF FLT AND IN BLACK AIR NO LESS. SPURIOUS TA'S HAVE OCCURRED AT DFW/KATL IN PAST BUT A RA WITH COMMANDED LEVEL OFF COULD PRECIPITATE AN ACCIDENT. 'CLR OF CONFLICT' WAS NOT ANNOUNCED FOR 1-1 1/2 MINS AND THE IVSI COMMANDED A LEVEL OFF THE ENTIRE TIME. ACFT LESS THAN 30 DAYS SINCE DELIVERY FROM MAINT DEPOT.
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.