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Flight crew of medium large transport at FL330 had TCASII RA, descended 500 ft to clear RA. Center said only traffic was military flight of 2 at FL280 then later said they had a squawk from 1 of the military at 33500.
| Attributes | |
| ACN | 189952 |
| Time | |
| Date | 199109 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : atl |
| State Reference | GA |
| Altitude | msl bound lower : 32500 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other Other |
| Flight Phase | cruise other |
| Route In Use | enroute airway : ztl |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | other |
| Make Model Name | Military Trainer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 12000 flight time type : 2500 |
| ASRS Report | 189952 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : commercial pilot : instrument |
| 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 |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Cruise flight 33000. Autoplt engaged. TCASII operating. TCASII gave TA alert with red diamond indication on scope. Altitude of target showed +500 ft. Immediately followed by RA commanding 'descend'. Disconnected autoplt per company procedures and descended at 1000 FPM to approximately 32500 as commanded by TCASII. Instructed ATC of our actions immediately. Not able to locate traffic threat visually. Atl center said only traffic in area we described was military flight of 2 at FL280. Then said appeared 1 military aircraft's altitude reporting showed 33500.
Original NASA ASRS Text
Title: FLC OF MLG AT FL330 HAD TCASII RA, DSNDED 500 FT TO CLR RA. CENTER SAID ONLY TFC WAS MIL FLT OF 2 AT FL280 THEN LATER SAID THEY HAD A SQUAWK FROM 1 OF THE MIL AT 33500.
Narrative: CRUISE FLT 33000. AUTOPLT ENGAGED. TCASII OPERATING. TCASII GAVE TA ALERT WITH RED DIAMOND INDICATION ON SCOPE. ALT OF TARGET SHOWED +500 FT. IMMEDIATELY FOLLOWED BY RA COMMANDING 'DSND'. DISCONNECTED AUTOPLT PER COMPANY PROCS AND DSNDED AT 1000 FPM TO APPROX 32500 AS COMMANDED BY TCASII. INSTRUCTED ATC OF OUR ACTIONS IMMEDIATELY. NOT ABLE TO LOCATE TFC THREAT VISUALLY. ATL CENTER SAID ONLY TFC IN AREA WE DESCRIBED WAS MIL FLT OF 2 AT FL280. THEN SAID APPEARED 1 MIL ACFT'S ALT RPTING SHOWED 33500.
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.