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ARTCC controller incorrectly allowed an MD80 to level off at FL310 at the same time a carj was slowly descending out of FL298 for FL290.
| Attributes | |
| ACN | 460020 |
| Time | |
| Date | 200001 |
| Day | Wed |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | navaid : vhp.vor |
| State Reference | IN |
| Altitude | msl single value : 31000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| 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 : enroute altitude change |
| Route In Use | enroute : on vectors |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zid.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Experience | controller military : 4 controller radar : 6 controller time certified in position1 : 10 |
| ASRS Report | 460020 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller limited radar : 1 controller non radar : 1 controller radar : 5 controller time certified in position1 : 5 |
| ASRS Report | 460019 |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera other controllerb |
| Resolutory Action | controller : issued advisory |
| Miss Distance | horizontal : 8000 vertical : 1200 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Air carrier Z off vpz was apprequed climbing to FL350. Aircraft was observed on a southerly heading. Air carrier Z was then observed on a southeast heading toward air carrier X at FL350. I called ZAU to get air carrier Z turned, and they said they knew nothing about him. I then called air carrier Z and he responded. I turned him to a northeast heading and turned air carrier X left 20 degrees. I then heard ind sector controller say to descend the air carrier X. I thought I heard him say FL310, but he said FL330. Air carrier X was descending fast and aircraft at FL310 (air carrier Y) in ind sector airspace was being descended to FL290. Air carrier Y was out of FL310 before air carrier X left FL330. Due to descent rates of both aircraft separation was lost. Supplemental information from acn 460019: my d-side took a point out on air carrier Z climbing sbound to FL410. A couple mins later, I observed air carrier Z turning eastbound in confliction with air carrier X wbound landing stl at FL350. I manually coordinated with sector 99 (wabash) to descend air carrier X to FL330 to help them out. Then I descended air carrier Y from FL310 to FL290 landing stl wbound planning on descending air carrier X to FL310 eventually. A few mins later, separation was lost between air carrier Y and air carrier X. I didn't observe air carrier X leave FL330 until he called on at FL310 and air carrier Y was out of FL298. I thought that wabash applied a rule when I observed the 1200 ft.
Original NASA ASRS Text
Title: ARTCC CTLR INCORRECTLY ALLOWED AN MD80 TO LEVEL OFF AT FL310 AT THE SAME TIME A CARJ WAS SLOWLY DSNDING OUT OF FL298 FOR FL290.
Narrative: ACR Z OFF VPZ WAS APPREQUED CLBING TO FL350. ACFT WAS OBSERVED ON A SOUTHERLY HDG. ACR Z WAS THEN OBSERVED ON A SE HDG TOWARD ACR X AT FL350. I CALLED ZAU TO GET ACR Z TURNED, AND THEY SAID THEY KNEW NOTHING ABOUT HIM. I THEN CALLED ACR Z AND HE RESPONDED. I TURNED HIM TO A NE HDG AND TURNED ACR X L 20 DEGS. I THEN HEARD IND SECTOR CTLR SAY TO DSND THE ACR X. I THOUGHT I HEARD HIM SAY FL310, BUT HE SAID FL330. ACR X WAS DSNDING FAST AND ACFT AT FL310 (ACR Y) IN IND SECTOR AIRSPACE WAS BEING DSNDED TO FL290. ACR Y WAS OUT OF FL310 BEFORE ACR X LEFT FL330. DUE TO DSCNT RATES OF BOTH ACFT SEPARATION WAS LOST. SUPPLEMENTAL INFO FROM ACN 460019: MY D-SIDE TOOK A POINT OUT ON ACR Z CLBING SBOUND TO FL410. A COUPLE MINS LATER, I OBSERVED ACR Z TURNING EBOUND IN CONFLICTION WITH ACR X WBOUND LNDG STL AT FL350. I MANUALLY COORDINATED WITH SECTOR 99 (WABASH) TO DSND ACR X TO FL330 TO HELP THEM OUT. THEN I DSNDED ACR Y FROM FL310 TO FL290 LNDG STL WBOUND PLANNING ON DSNDING ACR X TO FL310 EVENTUALLY. A FEW MINS LATER, SEPARATION WAS LOST BTWN ACR Y AND ACR X. I DIDN'T OBSERVE ACR X LEAVE FL330 UNTIL HE CALLED ON AT FL310 AND ACR Y WAS OUT OF FL298. I THOUGHT THAT WABASH APPLIED A RULE WHEN I OBSERVED THE 1200 FT.
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.