 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ZID associate controller attempts to advise radar controller of pending conflict between a descending and en route air carrier, but comment was not correctly perceived.
| Attributes | |
| ACN | 508498 |
| Time | |
| Date | 200104 |
| Day | Wed |
| Place | |
| State Reference | KY |
| Altitude | msl bound lower : 33000 msl bound upper : 34800 |
| Environment | |
| Flight Conditions | VMC |
| Light | Dusk |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid.artcc tower : isp.tower |
| Operator | common carrier : air carrier |
| Make Model Name | EMB ERJ 145 ER&LR |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : enroute altitude change |
| 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 |
| Route In Use | enroute airway : j42.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : developmental |
| Experience | controller military : 9 controller radar : 10 controller time certified in position1 : 0.583 |
| ASRS Report | 508498 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 26400 vertical : 1800 |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error Intra Facility Coordination Failure |
Narrative:
The MD80 was eastbound on J42 at FL330. The radar controller descended the E145, who was at FL370, to FL330 for descent into pit. When the conflict alert activated, I (radar associate) told the radar controller that the computer doesn't like FL330 for the E145. The radar controller, thinking he gave descent clearance to FL350, but put in a hard altitude of FL330, suppressed the conflict alert. When the conflict alert activated a second time, the E145 was out of FL348 and 4.4 mi behind. The radar controller climbed the E145 to FL350, but it was too late, the separation had already been lost.
Original NASA ASRS Text
Title: ZID ASSOCIATE CTLR ATTEMPTS TO ADVISE RADAR CTLR OF PENDING CONFLICT BTWN A DSNDING AND ENRTE ACR, BUT COMMENT WAS NOT CORRECTLY PERCEIVED.
Narrative: THE MD80 WAS EBOUND ON J42 AT FL330. THE RADAR CTLR DSNDED THE E145, WHO WAS AT FL370, TO FL330 FOR DSCNT INTO PIT. WHEN THE CONFLICT ALERT ACTIVATED, I (RADAR ASSOCIATE) TOLD THE RADAR CTLR THAT THE COMPUTER DOESN'T LIKE FL330 FOR THE E145. THE RADAR CTLR, THINKING HE GAVE DSCNT CLRNC TO FL350, BUT PUT IN A HARD ALT OF FL330, SUPPRESSED THE CONFLICT ALERT. WHEN THE CONFLICT ALERT ACTIVATED A SECOND TIME, THE E145 WAS OUT OF FL348 AND 4.4 MI BEHIND. THE RADAR CTLR CLBED THE E145 TO FL350, BUT IT WAS TOO LATE, THE SEPARATION HAD ALREADY BEEN 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.