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Enroute controller experienced a near loss of separation when traffic did not climb at the expected rate during an opposite direction event; the reporter indicated pilots should alert ATC regarding slow climbs.
| Attributes | |
| ACN | 954927 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 1201-1800 |
| Place | |
| Locale Reference | ZZZ.ARTCC |
| State Reference | US |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Climb |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Traffic Management |
| Qualification | Air Traffic Control Fully Certified |
| Events | |
| Anomaly | ATC Issue All Types Conflict Airborne Conflict |
Narrative:
Air carrier X; level at FL350; requested FL370. [There was] opposite direction traffic 30 miles away at FL360. Climb was issued; but aircraft did not climb as expected. Conflict alert activated with aircraft more than a minute away and mode C readout of FL363. I told air carrier X to expedite climb and report level at FL370. I thought aircraft could have climbed faster than he did. I ultimately got air carrier X to verify he was level just seconds before separation was lost. I felt aircraft did not perform a standard rate of climb and recommend that pilots inform ATC when doing less than a standard rate of climb.
Original NASA ASRS Text
Title: Enroute Controller experienced a near loss of separation when traffic did not climb at the expected rate during an opposite direction event; the reporter indicated pilots should alert ATC regarding slow climbs.
Narrative: Air Carrier X; level at FL350; requested FL370. [There was] opposite direction traffic 30 miles away at FL360. Climb was issued; but aircraft did not climb as expected. Conflict alert activated with aircraft more than a minute away and mode C readout of FL363. I told Air Carrier X to expedite climb and report level at FL370. I thought aircraft could have climbed faster than he did. I ultimately got Air Carrier X to verify he was level just seconds before separation was lost. I felt aircraft did not perform a standard rate of climb and recommend that pilots inform ATC when doing less than a standard rate of climb.
Data retrieved from NASA's ASRS site as of April 2012 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.