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Standard separation was lost between an aircraft climbing to FL250 and an aircraft climbing to FL260.
| Attributes | |
| ACN | 157716 |
| Time | |
| Date | 199009 |
| Day | Mon |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : mkg |
| State Reference | MI |
| Altitude | msl bound lower : 24000 msl bound upper : 25000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zau |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 1 |
| ASRS Report | 157716 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment other atc equipment : unspecified |
| Resolutory Action | none taken : anomaly accepted |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22800 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
The aircraft involved was climbing to FL250 after coordination had been accomplished with several sectors that the aircraft's route affected. The receiving sector approved the aircraft climbing to FL250, then shortly thereafter showed my sector possible traffic for the aircraft involved. This aircraft was also climbing and was the same type aircraft (same carrier). At this time the aircraft that was traffic for my aircraft was 4000' higher than mine and cleared to FL260. My thinking at the time was that the aircraft was no factor and there was no conflict. However, once the aircraft climbing to FL260 left FL250, the aircraft's rate of climb reduced greatly. The aircraft climbing to FL250 was now about to go through FL240 and shortly thereafter sep was lost.
Original NASA ASRS Text
Title: STANDARD SEPARATION WAS LOST BETWEEN AN ACFT CLIMBING TO FL250 AND AN ACFT CLIMBING TO FL260.
Narrative: THE ACFT INVOLVED WAS CLBING TO FL250 AFTER COORD HAD BEEN ACCOMPLISHED WITH SEVERAL SECTORS THAT THE ACFT'S RTE AFFECTED. THE RECEIVING SECTOR APPROVED THE ACFT CLBING TO FL250, THEN SHORTLY THEREAFTER SHOWED MY SECTOR POSSIBLE TFC FOR THE ACFT INVOLVED. THIS ACFT WAS ALSO CLBING AND WAS THE SAME TYPE ACFT (SAME CARRIER). AT THIS TIME THE ACFT THAT WAS TFC FOR MY ACFT WAS 4000' HIGHER THAN MINE AND CLRED TO FL260. MY THINKING AT THE TIME WAS THAT THE ACFT WAS NO FACTOR AND THERE WAS NO CONFLICT. HOWEVER, ONCE THE ACFT CLBING TO FL260 LEFT FL250, THE ACFT'S RATE OF CLB REDUCED GREATLY. THE ACFT CLBING TO FL250 WAS NOW ABOUT TO GO THROUGH FL240 AND SHORTLY THEREAFTER SEP WAS LOST.
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.