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Air carrier medium large transport altitude deviation excursion from clearance altitude in response to TCASII RA. Traffic was in sight.
| Attributes | |
| ACN | 181170 |
| Time | |
| Date | 199106 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : scy airport : dfw |
| State Reference | TX |
| Altitude | msl bound lower : 11000 msl bound upper : 11400 |
| Environment | |
| Flight Conditions | VMC |
| 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 |
| Route In Use | arrival star : star |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 12000 |
| ASRS Report | 181170 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 100 flight time total : 3000 flight time type : 100 |
| ASRS Report | 181584 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe 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 | vertical : 600 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | other |
Narrative:
TCAS aircraft was in level flight with autoplt on. TCAS issued instructions to climb. Climb was initiated as required by standard FAA procedures. TCAS warning was for a departure out of dfw that was reported by ATC to be level 1000' below us. We feel the alert was unnecessary as both aircraft has standard sep for the terminal area. The required altitude deviation placed us in greater danger. Pilot has no option to evaluate a known situation as FAA procedures mandate pilot evasive action. TCAS warnings in terminal areas are excessive. The software needs refining badly before it causes an accident, or the FAA should allow the pilots judgement to override a TCAS warning or command. Supplemental information from acn 181584: warning was for a dfw departure climbing/leveling 1000' below our altitude and was in sight.
Original NASA ASRS Text
Title: ACR MLG ALT DEVIATION EXCURSION FROM CLRNC ALT IN RESPONSE TO TCASII RA. TRAFFIC WAS IN SIGHT.
Narrative: TCAS ACFT WAS IN LEVEL FLT WITH AUTOPLT ON. TCAS ISSUED INSTRUCTIONS TO CLB. CLB WAS INITIATED AS REQUIRED BY STANDARD FAA PROCS. TCAS WARNING WAS FOR A DEP OUT OF DFW THAT WAS RPTED BY ATC TO BE LEVEL 1000' BELOW US. WE FEEL THE ALERT WAS UNNECESSARY AS BOTH ACFT HAS STANDARD SEP FOR THE TERMINAL AREA. THE REQUIRED ALT DEVIATION PLACED US IN GREATER DANGER. PLT HAS NO OPTION TO EVALUATE A KNOWN SITUATION AS FAA PROCS MANDATE PLT EVASIVE ACTION. TCAS WARNINGS IN TERMINAL AREAS ARE EXCESSIVE. THE SOFTWARE NEEDS REFINING BADLY BEFORE IT CAUSES AN ACCIDENT, OR THE FAA SHOULD ALLOW THE PLTS JUDGEMENT TO OVERRIDE A TCAS WARNING OR COMMAND. SUPPLEMENTAL INFO FROM ACN 181584: WARNING WAS FOR A DFW DEP CLBING/LEVELING 1000' BELOW OUR ALT AND WAS IN SIGHT.
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.