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A trainee ARTCC radar controller inadvertently issued a descent to a B767 to FL240 with an IFR BE36 at FL250 resulting in loss of separation. The instructor controller states that with 4 controllers plugged in, no one caught the mistake.
| Attributes | |
| ACN | 403285 |
| Time | |
| Date | 199805 |
| Day | Wed |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | atc facility : hnb |
| State Reference | IN |
| Altitude | msl bound lower : 25000 msl bound upper : 26000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zid |
| Operator | common carrier : air carrier |
| Make Model Name | B767 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : personal |
| Make Model Name | Bonanza 36 |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller radar : 10 |
| ASRS Report | 403285 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 6000 vertical : 900 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
While radar training, an altitude was issued (FL240) to the B767. The radar tracker was on a landline and did not hear the clearance. Several mins passed with FL260 (not FL240) in the data block. The traffic, a BE36, was at FL250 and called to the B767. The radar trainee said 'I'll have lower clearing that traffic.' the B767 said 'roger' but did not take any action to stop the controller's error, such as questioning the clearance. Separation lost was 1 mi and 900 ft. We had 4 controllers plugged in and no one caught this. More awareness needed from everyone involved.
Original NASA ASRS Text
Title: A TRAINEE ARTCC RADAR CTLR INADVERTENTLY ISSUED A DSCNT TO A B767 TO FL240 WITH AN IFR BE36 AT FL250 RESULTING IN LOSS OF SEPARATION. THE INSTRUCTOR CTLR STATES THAT WITH 4 CTLRS PLUGGED IN, NO ONE CAUGHT THE MISTAKE.
Narrative: WHILE RADAR TRAINING, AN ALT WAS ISSUED (FL240) TO THE B767. THE RADAR TRACKER WAS ON A LANDLINE AND DID NOT HEAR THE CLRNC. SEVERAL MINS PASSED WITH FL260 (NOT FL240) IN THE DATA BLOCK. THE TFC, A BE36, WAS AT FL250 AND CALLED TO THE B767. THE RADAR TRAINEE SAID 'I'LL HAVE LOWER CLRING THAT TFC.' THE B767 SAID 'ROGER' BUT DID NOT TAKE ANY ACTION TO STOP THE CTLR'S ERROR, SUCH AS QUESTIONING THE CLRNC. SEPARATION LOST WAS 1 MI AND 900 FT. WE HAD 4 CTLRS PLUGGED IN AND NO ONE CAUGHT THIS. MORE AWARENESS NEEDED FROM EVERYONE INVOLVED.
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.