 |
37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
|
ZMA controller experienced operational error at 5000 ft after approving a direct route with one aircraft that did not provide enough lateral spacing with another aircraft.
| Attributes | |
| ACN | 684870 |
| Time | |
| Date | 200601 |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : fll.airport |
| Altitude | msl single value : 5000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Beech 1900 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent : approach |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zma.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Merlin IV A |
| 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 radar : 15 controller time certified in position1 : 15 |
| ASRS Report | 684870 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | controller : issued alert controller : issued new clearance flight crew : took evasive action |
| Consequence | faa : investigated |
| Supplementary | |
| Problem Areas | ATC Human Performance |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
I was working on sector 41 from XA07Z to XB06Z. Around XA50Z; I issued air carrier X descend clearance to 4000 ft. Air carrier Y checked on my frequency shortly after that level at 5000 ft. Air carrier Y requested direct destination and after evaluating the situation I issued the clearance. Shortly after that; air carrier Y requested lower and I instructed the pilot to stand by; and immediately instructed air carrier X to expedite his descent to 4000 ft to maintain my separation. After that; my next transmission was to turn air carrier Y 30 degrees to the left to maintain lateral and allow for his descent into zbv. About 20 seconds after that; conflict alert went off and I re-evaluated the situation. I noticed that my separation was maintained and I issued xfer of communication to air carrier X and turned air carrier Y back to zbv.
Original NASA ASRS Text
Title: ZMA CTLR EXPERIENCED OPERROR AT 5000 FT AFTER APPROVING A DIRECT RTE WITH ONE ACFT THAT DID NOT PROVIDE ENOUGH LATERAL SPACING WITH ANOTHER ACFT.
Narrative: I WAS WORKING ON SECTOR 41 FROM XA07Z TO XB06Z. AROUND XA50Z; I ISSUED ACR X DSND CLRNC TO 4000 FT. ACR Y CHKED ON MY FREQ SHORTLY AFTER THAT LEVEL AT 5000 FT. ACR Y REQUESTED DIRECT DEST AND AFTER EVALUATING THE SITUATION I ISSUED THE CLRNC. SHORTLY AFTER THAT; ACR Y REQUESTED LOWER AND I INSTRUCTED THE PLT TO STAND BY; AND IMMEDIATELY INSTRUCTED ACR X TO EXPEDITE HIS DSCNT TO 4000 FT TO MAINTAIN MY SEPARATION. AFTER THAT; MY NEXT XMISSION WAS TO TURN ACR Y 30 DEGS TO THE L TO MAINTAIN LATERAL AND ALLOW FOR HIS DSCNT INTO ZBV. ABOUT 20 SECONDS AFTER THAT; CONFLICT ALERT WENT OFF AND I RE-EVALUATED THE SITUATION. I NOTICED THAT MY SEPARATION WAS MAINTAINED AND I ISSUED XFER OF COM TO ACR X AND TURNED ACR Y BACK TO ZBV.
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.