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ZID controller experienced operational error at FL310 when misjudging the timeframe needed by one aircraft to climb clear of another aircraft.
| Attributes | |
| ACN | 644551 |
| Time | |
| Date | 200501 |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : ffo.airport |
| State Reference | OH |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : intermediate altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | B737-300 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 4 controller radar : 2 flight time total : 110 |
| ASRS Report | 644551 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : supervisor |
| Qualification | pilot : instrument |
| Experience | controller radar : 24 controller supervisory : 16 flight time total : 600 |
| ASRS Report | 644550 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb other other : 3 |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 24000 vertical : 1500 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft X sbound at FL290; air carrier Y wbound at FL310. I asked aircraft X to report leaving FL330; and maintain FL350. He said roger; but failed to climb in time. I failed to use the appropriate time clearance. I disagree with the current form of the time clearance. It is long; bulky; and virtually unusable in busy sits when you need it the most. Supplemental information from acn 644550: controller asked aircraft #1 if he could be out of FL330 in 90 seconds. Aircraft #1 replied 'roger.' controller cleared aircraft #1 to FL350. Conflict alert activated and controller was asked what he was doing. Controller replied 'pilot said he would be out of FL330.' I told controller to turn both aircraft. Vectors were too late to effect separation.
Original NASA ASRS Text
Title: ZID CTLR EXPERIENCED OPERROR AT FL310 WHEN MISJUDGING THE TIMEFRAME NEEDED BY ONE ACFT TO CLB CLR OF ANOTHER ACFT.
Narrative: ACFT X SBOUND AT FL290; ACR Y WBOUND AT FL310. I ASKED ACFT X TO RPT LEAVING FL330; AND MAINTAIN FL350. HE SAID ROGER; BUT FAILED TO CLB IN TIME. I FAILED TO USE THE APPROPRIATE TIME CLRNC. I DISAGREE WITH THE CURRENT FORM OF THE TIME CLRNC. IT IS LONG; BULKY; AND VIRTUALLY UNUSABLE IN BUSY SITS WHEN YOU NEED IT THE MOST. SUPPLEMENTAL INFO FROM ACN 644550: CTLR ASKED ACFT #1 IF HE COULD BE OUT OF FL330 IN 90 SECONDS. ACFT #1 REPLIED 'ROGER.' CTLR CLRED ACFT #1 TO FL350. CONFLICT ALERT ACTIVATED AND CTLR WAS ASKED WHAT HE WAS DOING. CTLR REPLIED 'PLT SAID HE WOULD BE OUT OF FL330.' I TOLD CTLR TO TURN BOTH ACFT. VECTORS WERE TOO LATE TO EFFECT SEPARATION.
Data retrieved from NASA's ASRS site as of January 2009 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.