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ZDV recognizes and reacts with insufficient time to resolve an approved, wrong altitude for direction of flight, altitude conflict.
| Attributes | |
| ACN | 538455 |
| Time | |
| Date | 200202 |
| Day | Sat |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : hbu.vortac |
| State Reference | CO |
| Altitude | msl bound lower : 33000 msl bound upper : 35000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zdv.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | A320 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| ASRS Report | 538455 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Events | |
| Anomaly | conflict : airborne less severe non adherence : published procedure non adherence : required legal separation |
| Independent Detector | atc equipment : conflict alert other controllera |
| Resolutory Action | none taken : insufficient time |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 15000 vertical : 1900 |
| Supplementary | |
| Problem Areas | ATC Human Performance Environmental Factor |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
Aircraft Y (MD80) was eastbound (den arrival) at FL350 (wrong altitude for direction of flight). The altitude was requested due to traffic, his original altitude was FL370. Aft X (A320) was nebound at FL330. I thought aircraft X was the reason aircraft Y was descended to FL350. I thought aircraft X was at FL370. I held wbound traffic at FL350 for aircraft Y and descended aircraft Y to FL330, thinking aircraft X was at FL370. (I never talked to aircraft X.) I saw my mistake and told aircraft Y to maintain FL350, however, separation was lost.
Original NASA ASRS Text
Title: ZDV RECOGNIZES AND REACTS WITH INSUFFICIENT TIME TO RESOLVE AN APPROVED, WRONG ALT FOR DIRECTION OF FLT, ALT CONFLICT.
Narrative: ACFT Y (MD80) WAS EBOUND (DEN ARR) AT FL350 (WRONG ALT FOR DIRECTION OF FLT). THE ALT WAS REQUESTED DUE TO TFC, HIS ORIGINAL ALT WAS FL370. AFT X (A320) WAS NEBOUND AT FL330. I THOUGHT ACFT X WAS THE REASON ACFT Y WAS DSNDED TO FL350. I THOUGHT ACFT X WAS AT FL370. I HELD WBOUND TFC AT FL350 FOR ACFT Y AND DSNDED ACFT Y TO FL330, THINKING ACFT X WAS AT FL370. (I NEVER TALKED TO ACFT X.) I SAW MY MISTAKE AND TOLD ACFT Y TO MAINTAIN FL350, HOWEVER, SEPARATION WAS LOST.
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.