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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier B727 flight crew were level at FL230 when they received an 'RA' from an aircraft that was supposed to be at FL240. Their TCASII read zero altitude differential.
| Attributes | |
| ACN | 383680 |
| Time | |
| Date | 199710 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : vwv |
| State Reference | OH |
| Altitude | msl bound lower : 23000 msl bound upper : 24000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude cruise other cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | other : unknown |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time type : 180 |
| ASRS Report | 383680 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera other flight crewa |
| Resolutory Action | flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | vertical : 1000 |
| Supplementary | |
| Air Traffic Incident | other |
Narrative:
We were level at FL230 and told another aircraft was to descend to FL240. When he passed we would get higher. The TCASII gave a descent and showed the aircraft at '0' ft differential in red. We reported this to ATC and the reply came back that he was at FL240 or to cross at FL240.
Original NASA ASRS Text
Title: AN ACR B727 FLC WERE LEVEL AT FL230 WHEN THEY RECEIVED AN 'RA' FROM AN ACFT THAT WAS SUPPOSED TO BE AT FL240. THEIR TCASII READ ZERO ALT DIFFERENTIAL.
Narrative: WE WERE LEVEL AT FL230 AND TOLD ANOTHER ACFT WAS TO DSND TO FL240. WHEN HE PASSED WE WOULD GET HIGHER. THE TCASII GAVE A DSCNT AND SHOWED THE ACFT AT '0' FT DIFFERENTIAL IN RED. WE RPTED THIS TO ATC AND THE REPLY CAME BACK THAT HE WAS AT FL240 OR TO CROSS AT FL240.
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.