 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
Flight crew of an large transport air carrier aircraft descended below assigned altitude in response to a TCASII RA.
| Attributes | |
| ACN | 248378 |
| Time | |
| Date | 199308 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : tay |
| State Reference | FL |
| Altitude | msl bound lower : 28200 msl bound upper : 29000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| 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 | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| 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 : 200 flight time total : 8000 flight time type : 3000 |
| ASRS Report | 248378 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 210 flight time total : 8000 flight time type : 210 |
| ASRS Report | 249171 |
| 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 : took evasive action flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Miss Distance | vertical : 2300 |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
In level flight at FL290 in cruise we received a TCASII RA to descend. We followed TCASII commands and descended to FL282. While at FL282, an light transport jet crossed overhead (by 2300 ft per TCASII). This would put the light transport at FL305 according to TCASII. We advised ATC of our RA and altitude and climbed back to FL290 after the traffic cleared. ATC was unaware of any traffic conflict. The flight concluded uneventfully.
Original NASA ASRS Text
Title: FLC OF AN LGT ACR ACFT DSNDED BELOW ASSIGNED ALT IN RESPONSE TO A TCASII RA.
Narrative: IN LEVEL FLT AT FL290 IN CRUISE WE RECEIVED A TCASII RA TO DSND. WE FOLLOWED TCASII COMMANDS AND DSNDED TO FL282. WHILE AT FL282, AN LTT JET CROSSED OVERHEAD (BY 2300 FT PER TCASII). THIS WOULD PUT THE LTT AT FL305 ACCORDING TO TCASII. WE ADVISED ATC OF OUR RA AND ALT AND CLBED BACK TO FL290 AFTER THE TFC CLRED. ATC WAS UNAWARE OF ANY TFC CONFLICT. THE FLT CONCLUDED UNEVENTFULLY.
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.