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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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ARTCC radar controller, unable to establish radio contact with cpr jet in an unauthorized descent, issues an urgent avoidance maneuver to air carrier X with a turn off course.
| Attributes | |
| ACN | 360641 |
| Time | |
| Date | 199702 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : den |
| State Reference | CO |
| Altitude | msl bound lower : 35000 msl bound upper : 36300 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zdv tower : pvd |
| Operator | common carrier : air carrier |
| Make Model Name | B737 Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other |
| Route In Use | enroute : on vectors enroute other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | general aviation : corporate |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : commercial pilot : flight engineer pilot : instrument pilot : atp |
| Experience | flight time last 90 days : 75 flight time total : 15000 flight time type : 2000 |
| ASRS Report | 360641 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : required legal separation non adherence : clearance non adherence : far other anomaly other |
| Independent Detector | other controllera |
| Resolutory Action | controller : issued new clearance other |
| Consequence | Other |
| Miss Distance | horizontal : 5000 vertical : 1300 |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
At FL350, north of den, we received a call from ZDV controller to turn right (north) 40 degrees. Apparently, an executive jet had started a descent from FL370 that would have conflicted with us at FL350. TCASII was operational at the time and his lowest altitude observed was FL363 and several mi south and would have passed off our left by a wide margin. Unfortunately, the controller's first call to us was blocked and he was very anxious when he did get our attention. I thought he was mad at us for not answering his first call. This report is only intended to set the facts correct as I saw them.
Original NASA ASRS Text
Title: ARTCC RADAR CTLR, UNABLE TO ESTABLISH RADIO CONTACT WITH CPR JET IN AN UNAUTH DSCNT, ISSUES AN URGENT AVOIDANCE MANEUVER TO ACR X WITH A TURN OFF COURSE.
Narrative: AT FL350, N OF DEN, WE RECEIVED A CALL FROM ZDV CTLR TO TURN R (N) 40 DEGS. APPARENTLY, AN EXECUTIVE JET HAD STARTED A DSCNT FROM FL370 THAT WOULD HAVE CONFLICTED WITH US AT FL350. TCASII WAS OPERATIONAL AT THE TIME AND HIS LOWEST ALT OBSERVED WAS FL363 AND SEVERAL MI S AND WOULD HAVE PASSED OFF OUR L BY A WIDE MARGIN. UNFORTUNATELY, THE CTLR'S FIRST CALL TO US WAS BLOCKED AND HE WAS VERY ANXIOUS WHEN HE DID GET OUR ATTN. I THOUGHT HE WAS MAD AT US FOR NOT ANSWERING HIS FIRST CALL. THIS RPT IS ONLY INTENDED TO SET THE FACTS CORRECT AS I SAW THEM.
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.