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Flight crew of a widebody transport air carrier aircraft descended below assigned departure altitude in response to a TCASII RA.
| Attributes | |
| ACN | 255546 |
| Time | |
| Date | 199310 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : aus |
| State Reference | TX |
| Altitude | msl bound lower : 3700 msl bound upper : 4000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : aus |
| Operator | common carrier : air carrier |
| Make Model Name | Widebody, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Small Aircraft |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 17000 flight time type : 1000 |
| ASRS Report | 255546 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : atp pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : nmac non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | horizontal : 1000 vertical : 200 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During departure under radar control, leveled off at 4000 ft MSL, assigned altitude. Numerous VFR light aircraft 12 O'clock low. Closing fast on one, the TCASII triggered a TA followed quickly by an RA 'monitor vertical speed' warning. First officer panicked and instead of holding altitude as advised, performed an inappropriate evasive action and descended toward the target. Captain quickly recovered aircraft with minimal altitude loss. Lost 300 ft, bottomed out at 3700 ft MSL. Observed target aircraft visually pass 200 ft below and approximately 1000 ft right of aircraft. Recovered to 4000 ft and continued departure. Recommend more training of airline pilots regarding TCASII maneuvering and evasive action so as to be more understanding of proper avoidance actions.
Original NASA ASRS Text
Title: FLC OF A WDB ACR ACFT DSNDED BELOW ASSIGNED DEP ALT IN RESPONSE TO A TCASII RA.
Narrative: DURING DEP UNDER RADAR CTL, LEVELED OFF AT 4000 FT MSL, ASSIGNED ALT. NUMEROUS VFR LIGHT ACFT 12 O'CLOCK LOW. CLOSING FAST ON ONE, THE TCASII TRIGGERED A TA FOLLOWED QUICKLY BY AN RA 'MONITOR VERT SPD' WARNING. FO PANICKED AND INSTEAD OF HOLDING ALT AS ADVISED, PERFORMED AN INAPPROPRIATE EVASIVE ACTION AND DSNDED TOWARD THE TARGET. CAPT QUICKLY RECOVERED ACFT WITH MINIMAL ALT LOSS. LOST 300 FT, BOTTOMED OUT AT 3700 FT MSL. OBSERVED TARGET ACFT VISUALLY PASS 200 FT BELOW AND APPROX 1000 FT R OF ACFT. RECOVERED TO 4000 FT AND CONTINUED DEP. RECOMMEND MORE TRAINING OF AIRLINE PLTS REGARDING TCASII MANEUVERING AND EVASIVE ACTION SO AS TO BE MORE UNDERSTANDING OF PROPER AVOIDANCE ACTIONS.
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.