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Flight crew of an large transport aircraft descended below assigned high cruise altitude in response to a TCASII RA.
| Attributes | |
| ACN | 248463 |
| Time | |
| Date | 199308 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : mei |
| State Reference | MS |
| Altitude | msl bound lower : 26200 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zme |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial pilot : cfi pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 5200 flight time type : 2200 |
| ASRS Report | 248463 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 1800 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Northbound on the airway to mei VOR and we got an RA from an aircraft descending towards us at 12 O'clock. We were level at FL270 and he was cleared to FL280. Our TCASII didn't know he would level off so it gave us a descend command. We responded by descending to 26200 ft when we got the monitor vertical speed warning. We saw the other aircraft fly past and then returned to FL270. We advised center and they said they had no conflict with our deviation from assigned altitude.
Original NASA ASRS Text
Title: FLC OF AN LGT ACFT DSNDED BELOW ASSIGNED HIGH CRUISE ALT IN RESPONSE TO A TCASII RA.
Narrative: NBOUND ON THE AIRWAY TO MEI VOR AND WE GOT AN RA FROM AN ACFT DSNDING TOWARDS US AT 12 O'CLOCK. WE WERE LEVEL AT FL270 AND HE WAS CLRED TO FL280. OUR TCASII DIDN'T KNOW HE WOULD LEVEL OFF SO IT GAVE US A DSND COMMAND. WE RESPONDED BY DSNDING TO 26200 FT WHEN WE GOT THE MONITOR VERT SPD WARNING. WE SAW THE OTHER ACFT FLY PAST AND THEN RETURNED TO FL270. WE ADVISED CTR AND THEY SAID THEY HAD NO CONFLICT WITH OUR DEV FROM ASSIGNED ALT.
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.