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ARTCC controller showed that the DC9 descended from assigned altitude when aircraft was still climbing.
| Attributes | |
| ACN | 442720 |
| Time | |
| Date | 199907 |
| Day | Thu |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : rod.vortac |
| State Reference | OH |
| Altitude | msl bound lower : 34720 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : enroute altitude change |
| Route In Use | enroute airway : j149.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Route In Use | enroute airway : j149.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 145 flight time total : 16000 flight time type : 1900 |
| ASRS Report | 442720 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : multi engine pilot : instrument pilot : commercial |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : radar aircraft equipment : tcas other controllera other flight crewa other flight crewb |
| Resolutory Action | controller : issued advisory flight crew : returned to assigned airspace |
| Miss Distance | vertical : 1700 |
| Supplementary | |
| Problem Areas | ATC Human Performance Flight Crew Human Performance Aircraft |
| Primary Problem | Ambiguous |
Narrative:
Assigned to climb to FL350 using maximum available climb rate due heavy weight. We were climbing at 200 FPM. When we were at FL347.2 ARTCC said they had us level at FL350. They pointed out traffic beneath us at FL330. TCASII showed traffic 1700 ft below (consistent with our altitude FL347.2). ARTCC later reported we had descended from FL350 to FL347. Not true -- we were climbing the entire time. I believe ARTCC radar showed us in error at FL35O, then corrected down to FL347 showing a false descent.
Original NASA ASRS Text
Title: ARTCC CTLR SHOWED THAT THE DC9 DSNDED FROM ASSIGNED ALT WHEN ACFT WAS STILL CLBING.
Narrative: ASSIGNED TO CLB TO FL350 USING MAX AVAILABLE CLB RATE DUE HVY WT. WE WERE CLBING AT 200 FPM. WHEN WE WERE AT FL347.2 ARTCC SAID THEY HAD US LEVEL AT FL350. THEY POINTED OUT TFC BENEATH US AT FL330. TCASII SHOWED TFC 1700 FT BELOW (CONSISTENT WITH OUR ALT FL347.2). ARTCC LATER RPTED WE HAD DSNDED FROM FL350 TO FL347. NOT TRUE -- WE WERE CLBING THE ENTIRE TIME. I BELIEVE ARTCC RADAR SHOWED US IN ERROR AT FL35O, THEN CORRECTED DOWN TO FL347 SHOWING A FALSE DSCNT.
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.