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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier is asked to continue a 1500 FPM climb rate through FL250 due to traffic at FL240. The pilot indicated his climb rate would remain at 1500 FPM, but shortly thereafter, it began to drop off causing a conflict with the other air carrier at FL240. The controller claims that computer data information indicated that the pilot was never close to that climb rate.
| Attributes | |
| ACN | 361609 |
| Time | |
| Date | 199702 |
| Day | Thu |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : rod |
| State Reference | OH |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 8 |
| ASRS Report | 361609 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | altitude deviation : undershoot conflict : airborne less severe non adherence : clearance non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 24600 vertical : 700 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Operational Error Pilot Deviation |
Narrative:
Air carrier X departed cle J29 to iah. Air carrier X checked in out of 18900 ft climbing to FL280. Air carrier Y was nebound at FL240. We noticed they were traffic for each other. We asked air carrier X's rate of climb, he responded 1500 FPM. We assigned 1500 FPM through FL250. He said up at FL250, but his rate of climb was 1200 FPM for 40 seconds then dropped to 600 FPM. Turns were issued but separation was lost. After the operational error I asked the pilot if he maintained 1500 FPM to FL250, he said yes. But darc showed he was never close to 1500 FPM.
Original NASA ASRS Text
Title: AN ACR IS ASKED TO CONTINUE A 1500 FPM CLB RATE THROUGH FL250 DUE TO TFC AT FL240. THE PLT INDICATED HIS CLB RATE WOULD REMAIN AT 1500 FPM, BUT SHORTLY THEREAFTER, IT BEGAN TO DROP OFF CAUSING A CONFLICT WITH THE OTHER ACR AT FL240. THE CTLR CLAIMS THAT COMPUTER DATA INFO INDICATED THAT THE PLT WAS NEVER CLOSE TO THAT CLB RATE.
Narrative: ACR X DEPARTED CLE J29 TO IAH. ACR X CHKED IN OUT OF 18900 FT CLBING TO FL280. ACR Y WAS NEBOUND AT FL240. WE NOTICED THEY WERE TFC FOR EACH OTHER. WE ASKED ACR X'S RATE OF CLB, HE RESPONDED 1500 FPM. WE ASSIGNED 1500 FPM THROUGH FL250. HE SAID UP AT FL250, BUT HIS RATE OF CLB WAS 1200 FPM FOR 40 SECONDS THEN DROPPED TO 600 FPM. TURNS WERE ISSUED BUT SEPARATION WAS LOST. AFTER THE OPERROR I ASKED THE PLT IF HE MAINTAINED 1500 FPM TO FL250, HE SAID YES. BUT DARC SHOWED HE WAS NEVER CLOSE TO 1500 FPM.
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.