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TCASII RA alerts crew to passing overhead traffic after descent expedite is initiated at ARTCC radar controller's request. Potential conflict noted.
| Attributes | |
| ACN | 215833 |
| Time | |
| Date | 199207 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 21700 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other arrival star : star |
| Flight Plan | IFR |
| Aircraft 2 | |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 200 flight time total : 15000 flight time type : 1200 |
| ASRS Report | 215833 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance none taken : detected after the fact |
| Consequence | Other |
| Miss Distance | horizontal : 800 vertical : 300 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
| Situations | |
| ATC Facility | procedure or policy : unspecified |
Narrative:
At approximately PM33Z air carrier X was at FL220 about 18 NM northwest drako intersection after heading 070 degrees to intercept den 313 degree radial inbound. The aircraft was being flown on autoplt and the computer had just intercepted the den 313 degree radial inbound at 50 NM. Intercept confirmed accurate on raw data. At PM33Z, den center called for us to descend to FL190 and expedite out of FL210. Just as descent was started (approximately 300 ft down) air carrier X received a momentary TCASII alert/resolution directly overhead at 300 ft. No time for evasive action. Normal approach landing. Either controller workload too heavy or conflicting aircraft out of position.
Original NASA ASRS Text
Title: TCASII RA ALERTS CREW TO PASSING OVERHEAD TFC AFTER DSCNT EXPEDITE IS INITIATED AT ARTCC RADAR CTLR'S REQUEST. POTENTIAL CONFLICT NOTED.
Narrative: AT APPROX PM33Z ACR X WAS AT FL220 ABOUT 18 NM NW DRAKO INTXN AFTER HDG 070 DEGS TO INTERCEPT DEN 313 DEG RADIAL INBOUND. THE ACFT WAS BEING FLOWN ON AUTOPLT AND THE COMPUTER HAD JUST INTERCEPTED THE DEN 313 DEG RADIAL INBOUND AT 50 NM. INTERCEPT CONFIRMED ACCURATE ON RAW DATA. AT PM33Z, DEN CTR CALLED FOR US TO DSND TO FL190 AND EXPEDITE OUT OF FL210. JUST AS DSCNT WAS STARTED (APPROX 300 FT DOWN) ACR X RECEIVED A MOMENTARY TCASII ALERT/RESOLUTION DIRECTLY OVERHEAD AT 300 FT. NO TIME FOR EVASIVE ACTION. NORMAL APCH LNDG. EITHER CTLR WORKLOAD TOO HVY OR CONFLICTING ACFT OUT OF POS.
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.