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Apparent loss of separation between B737 and an opposite direction air carrier at the altitude, FL370.
| Attributes | |
| ACN | 393509 |
| Time | |
| Date | 199802 |
| Day | Mon |
| Local Time Of Day | 0001 To 0600 |
| Place | |
| Locale Reference | atc facility : pga |
| State Reference | AZ |
| Altitude | msl bound lower : 35000 msl bound upper : 37000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv artcc : zob |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Navigation In Use | Other |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| 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 : 290 flight time total : 13000 flight time type : 8000 |
| ASRS Report | 393509 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | controller : issued new clearance flight crew : took evasive action other |
| Consequence | Other |
| Miss Distance | horizontal : 18000 vertical : 700 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Assigned FL370 wrong way by ZDV while east of hgo for smoother ride over the rockies. Approaching pga we received a TA of traffic at our altitude 12:30 to 1 O'clock position. We spotted the aircraft's strobes and a few seconds later received an RA to descend. Disconnected the autoplt and autothrottles and began a 1500-2000 FPM descent. At 36600 ft TCASII went to 'monitor vertical speed' and showed level flight as minimum rate of descent. Began to level at 36300 ft, TCASII called 'clear of conflict.' due to frequency congestion we could not tell ZDV of our RA descent until well into the descent. ATC stated 'no conflict' and reassigned us to FL350 for the remainder of the flight.
Original NASA ASRS Text
Title: APPARENT LOSS OF SEPARATION BTWN B737 AND AN OPPOSITE DIRECTION ACR AT THE ALT, FL370.
Narrative: ASSIGNED FL370 WRONG WAY BY ZDV WHILE E OF HGO FOR SMOOTHER RIDE OVER THE ROCKIES. APCHING PGA WE RECEIVED A TA OF TFC AT OUR ALT 12:30 TO 1 O'CLOCK POS. WE SPOTTED THE ACFT'S STROBES AND A FEW SECONDS LATER RECEIVED AN RA TO DSND. DISCONNECTED THE AUTOPLT AND AUTOTHROTTLES AND BEGAN A 1500-2000 FPM DSCNT. AT 36600 FT TCASII WENT TO 'MONITOR VERT SPD' AND SHOWED LEVEL FLT AS MINIMUM RATE OF DSCNT. BEGAN TO LEVEL AT 36300 FT, TCASII CALLED 'CLR OF CONFLICT.' DUE TO FREQ CONGESTION WE COULD NOT TELL ZDV OF OUR RA DSCNT UNTIL WELL INTO THE DSCNT. ATC STATED 'NO CONFLICT' AND REASSIGNED US TO FL350 FOR THE REMAINDER OF THE FLT.
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.