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LR35 did not adhere to ATC clearance to vacate an altitude above the MD80. Controller tried to recover, but was too late. Lost separation.
| Attributes | |
| ACN | 429083 |
| Time | |
| Date | 199902 |
| Day | Sun |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : zid.artcc |
| State Reference | IN |
| Altitude | msl single value : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | general aviation : corporate |
| Make Model Name | Learjet 35 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | climbout : vacating altitude |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Series (DC-9-80) Undifferentiated or Other Model |
| 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 military : 16 controller radar : 10 controller time certified in position1 : 5 |
| ASRS Report | 429083 |
| Person 2 | |
| Affiliation | company : corporate |
| 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 : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 27000 vertical : 1800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
LR35 sbound climbing to FL390. MD80 wbound FL350. Asked LR35 if he could be above FL370 in less than 3 mins. He replied affirmative. When it looked like he was not going to make it, I asked again. We had different ideas on how much time was left for him to be out of FL370. Issued turn to LR35. Issued turn to MD80 twice, but pilot did not hear clearance.
Original NASA ASRS Text
Title: LR35 DID NOT ADHERE TO ATC CLRNC TO VACATE AN ALT ABOVE THE MD80. CTLR TRIED TO RECOVER, BUT WAS TOO LATE. LOST SEPARATION.
Narrative: LR35 SBOUND CLBING TO FL390. MD80 WBOUND FL350. ASKED LR35 IF HE COULD BE ABOVE FL370 IN LESS THAN 3 MINS. HE REPLIED AFFIRMATIVE. WHEN IT LOOKED LIKE HE WAS NOT GOING TO MAKE IT, I ASKED AGAIN. WE HAD DIFFERENT IDEAS ON HOW MUCH TIME WAS LEFT FOR HIM TO BE OUT OF FL370. ISSUED TURN TO LR35. ISSUED TURN TO MD80 TWICE, BUT PLT DID NOT HEAR CLRNC.
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.