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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A holding A320 flight crew received a TCASII RA descend command, due to an overhead descending B747. ATC advised not to descend due to a B727 holding 1000 ft beneath. When the A320 TCASII reported the B747 still in descent 600 ft above, the A320 flight crew took evasive turn action. The A320 TCASII showed the B747 descent altitude arrested 500 ft above.
| Attributes | |
| ACN | 391515 |
| Time | |
| Date | 199801 |
| Day | Fri |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : rmg |
| State Reference | GA |
| Altitude | msl bound lower : 20000 msl bound upper : 20000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : ztl tower : mdw |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B747 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 240 flight time total : 15000 flight time type : 6000 |
| ASRS Report | 391515 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : clearance non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 500 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Was holding at FL200 at rme VORTAC. Had a B727 holding directly below, in sight at FL190. Had a TCASII RA commanding a descent. Target showed above 1000 ft. Advised ZTL we had a TCASII RA to descend. He advised to maintain altitude because B727 directly below. TCASII RA showing +800 ft and descending. At +600 ft, we made a right turn back into the holding pattern. Established in turn, I noticed a B747 approximately 500 ft directly above and advised center.
Original NASA ASRS Text
Title: A HOLDING A320 FLC RECEIVED A TCASII RA DSND COMMAND, DUE TO AN OVERHEAD DSNDING B747. ATC ADVISED NOT TO DSND DUE TO A B727 HOLDING 1000 FT BENEATH. WHEN THE A320 TCASII RPTED THE B747 STILL IN DSCNT 600 FT ABOVE, THE A320 FLC TOOK EVASIVE TURN ACTION. THE A320 TCASII SHOWED THE B747 DSCNT ALT ARRESTED 500 FT ABOVE.
Narrative: WAS HOLDING AT FL200 AT RME VORTAC. HAD A B727 HOLDING DIRECTLY BELOW, IN SIGHT AT FL190. HAD A TCASII RA COMMANDING A DSCNT. TARGET SHOWED ABOVE 1000 FT. ADVISED ZTL WE HAD A TCASII RA TO DSND. HE ADVISED TO MAINTAIN ALT BECAUSE B727 DIRECTLY BELOW. TCASII RA SHOWING +800 FT AND DSNDING. AT +600 FT, WE MADE A R TURN BACK INTO THE HOLDING PATTERN. ESTABLISHED IN TURN, I NOTICED A B747 APPROX 500 FT DIRECTLY ABOVE AND ADVISED CTR.
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.