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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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B737-400 aircraft cleared descent to FL180 received TCASII RA at FL260, climbed to FL270 and then returned after resolution. Controller apologized for less than legal separation.
| Attributes | |
| ACN | 362892 |
| Time | |
| Date | 199703 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : bal |
| State Reference | MD |
| Altitude | msl bound lower : 26000 msl bound upper : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zny |
| Operator | common carrier : air carrier |
| Make Model Name | B737-400 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | other : unknown |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 180 flight time total : 23000 flight time type : 8000 |
| ASRS Report | 362892 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : commercial |
| Events | |
| Anomaly | non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course flight crew : took evasive action |
| Consequence | Other |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
At FL270 center climbed us to FL180. Descending at approximately FL260 received TCASII warning. Observed TCASII traffic 12 O'clock position low. TCASII went to RA. Followed TCASII command, returned to FL270 and reported problem to ZNY. ATC reclred us to FL270 and apologized. Aircraft passed approximately 2 1/2 to 3 NM to left and 700 ft low to our aircraft. TCASII played a major part in keeping our aircraft separated and at no time was this allowed to become a near miss situation.
Original NASA ASRS Text
Title: B737-400 ACFT CLRED DSCNT TO FL180 RECEIVED TCASII RA AT FL260, CLBED TO FL270 AND THEN RETURNED AFTER RESOLUTION. CTLR APOLOGIZED FOR LESS THAN LEGAL SEPARATION.
Narrative: AT FL270 CTR CLBED US TO FL180. DSNDING AT APPROX FL260 RECEIVED TCASII WARNING. OBSERVED TCASII TFC 12 O'CLOCK POS LOW. TCASII WENT TO RA. FOLLOWED TCASII COMMAND, RETURNED TO FL270 AND RPTED PROB TO ZNY. ATC RECLRED US TO FL270 AND APOLOGIZED. ACFT PASSED APPROX 2 1/2 TO 3 NM TO L AND 700 FT LOW TO OUR ACFT. TCASII PLAYED A MAJOR PART IN KEEPING OUR ACFT SEPARATED AND AT NO TIME WAS THIS ALLOWED TO BECOME A NEAR MISS 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.