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Flight crew of medium large transport at FL280 had TCAS RA, descend. Flight crew descended aircraft to 27500' until TCAS satisfied, then returned to FL280. ATC advised of reason for altitude deviation.
| Attributes | |
| ACN | 170813 |
| Time | |
| Date | 199102 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : ss0 |
| State Reference | AZ |
| Altitude | msl bound lower : 27500 msl bound upper : 28000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zab |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other |
| Route In Use | enroute airway : zab |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : instrument pilot : flight engineer pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 18000 flight time type : 2500 |
| ASRS Report | 170813 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 7500 flight time type : 1600 |
| ASRS Report | 170445 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | faa : reviewed incident with flight crew |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
During level cruise at FL280, TCAS detected oncoming traffic at 11 O'clock in a descent to FL290. A traffic alert was received with the command 'traffic,' followed shortly by a RA and the command 'descend.' aircraft began a descent to FL275 and ATC was advised of a RA and of descent. Aircraft immediately climbed back to FL280. ATC called and questioned our altitude deviation.
Original NASA ASRS Text
Title: FLT CREW OF MLG AT FL280 HAD TCAS RA, DESCEND. FLT CREW DESCENDED ACFT TO 27500' UNTIL TCAS SATISFIED, THEN RETURNED TO FL280. ATC ADVISED OF REASON FOR ALT DEVIATION.
Narrative: DURING LEVEL CRUISE AT FL280, TCAS DETECTED ONCOMING TFC AT 11 O'CLOCK IN A DSNT TO FL290. A TFC ALERT WAS RECEIVED WITH THE COMMAND 'TFC,' FOLLOWED SHORTLY BY A RA AND THE COMMAND 'DSND.' ACFT BEGAN A DSNT TO FL275 AND ATC WAS ADVISED OF A RA AND OF DSNT. ACFT IMMEDIATELY CLBED BACK TO FL280. ATC CALLED AND QUESTIONED OUR ALT DEVIATION.
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.