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Reporter descended air carrier #1 from FL270 to FL180 with air carrier #2 at FL260. Air carrier #1 received TCASII RA at FL265 and climbed back up. Operational error.
| Attributes | |
| ACN | 362771 |
| Time | |
| Date | 199703 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : psb |
| State Reference | PA |
| Altitude | msl bound lower : 26500 msl bound upper : 26500 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Experience | controller military : 3 controller non radar : 1 controller radar : 6 |
| ASRS Report | 362771 |
| 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 other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Miss Distance | horizontal : 12000 vertical : 500 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft #1 cruising FL270 2 mi north psb VOR sbound. Aircraft #2 cruising FL260 5 mi east psb VOR wbound. I issued descent to aircraft #1 to descend to FL180, not realizing conflict. Aircraft #1 began descent. At FL265 he advised TCASII RA climbing back up. My actions caused error due to my lack of vigilance. TCASII saved a more serious situation.
Original NASA ASRS Text
Title: RPTR DSNDED ACR #1 FROM FL270 TO FL180 WITH ACR #2 AT FL260. ACR #1 RECEIVED TCASII RA AT FL265 AND CLBED BACK UP. OPERROR.
Narrative: ACFT #1 CRUISING FL270 2 MI N PSB VOR SBOUND. ACFT #2 CRUISING FL260 5 MI E PSB VOR WBOUND. I ISSUED DSCNT TO ACFT #1 TO DSND TO FL180, NOT REALIZING CONFLICT. ACFT #1 BEGAN DSCNT. AT FL265 HE ADVISED TCASII RA CLBING BACK UP. MY ACTIONS CAUSED ERROR DUE TO MY LACK OF VIGILANCE. TCASII SAVED A MORE SERIOUS SIT.
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.