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Air carrier was mistakingly issued a descent that conflicted with another aircraft.
| Attributes | |
| ACN | 110168 |
| Time | |
| Date | 198905 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : pmd |
| State Reference | CA |
| Altitude | msl bound lower : 20000 msl bound upper : 22000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zla |
| Operator | common carrier : air carrier |
| Make Model Name | Medium Large Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Route In Use | arrival other |
| Flight Plan | IFR |
| Aircraft 2 | |
| Operator | common carrier : air carrier |
| Make Model Name | Large Transport, Low Wing, 3 Turbojet Eng |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 5000 flight time type : 400 |
| ASRS Report | 110168 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 9900 flight time type : 900 |
| ASRS Report | 110171 |
| Events | |
| Anomaly | altitude deviation : overshoot conflict : airborne less severe non adherence : required legal separation non adherence : published procedure |
| Independent Detector | atc equipment other atc equipment : unspecified other controllera |
| Resolutory Action | controller : issued new clearance |
| Consequence | faa : investigated |
| Miss Distance | horizontal : 22800 vertical : 0 |
| Supplementary | |
| Primary Problem | ATC Human Performance |
| Air Traffic Incident | Operational Error |
Narrative:
On descent to our destination, ont, cajon 6 arrival, we were told by ZLA to expect crossing pmd at FL230. Prior to pmd were cleared to descend to FL220. Just as we leveled at FL220, were cleared to expedite down to FL200. We acknowledged. Descending through FL205 the controller asked our altitude and stated that we were only cleared to FL220. There was a conflict of 3.8 mi. The one overriding factor in this event was controller overload. The controller was trying to talk to too many people at one time and not waiting for responses. Also, there was confusion about a military aircraft on UHF that the controller was handling.
Original NASA ASRS Text
Title: ACR WAS MISTAKINGLY ISSUED A DESCENT THAT CONFLICTED WITH ANOTHER ACFT.
Narrative: ON DSCNT TO OUR DEST, ONT, CAJON 6 ARR, WE WERE TOLD BY ZLA TO EXPECT XING PMD AT FL230. PRIOR TO PMD WERE CLRED TO DSND TO FL220. JUST AS WE LEVELED AT FL220, WERE CLRED TO EXPEDITE DOWN TO FL200. WE ACKNOWLEDGED. DSNDING THROUGH FL205 THE CTLR ASKED OUR ALT AND STATED THAT WE WERE ONLY CLRED TO FL220. THERE WAS A CONFLICT OF 3.8 MI. THE ONE OVERRIDING FACTOR IN THIS EVENT WAS CTLR OVERLOAD. THE CTLR WAS TRYING TO TALK TO TOO MANY PEOPLE AT ONE TIME AND NOT WAITING FOR RESPONSES. ALSO, THERE WAS CONFUSION ABOUT A MIL ACFT ON UHF THAT THE CTLR WAS HANDLING.
Data retrieved from NASA's ASRS site as of August 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.