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An L1011-100 descends out of its assigned altitude, the crew believing that they were given a descent clearance by ATC. ATC controller stops the flight around FL320 for opposite direction traffic at FL310.
| Attributes | |
| ACN | 428078 |
| Time | |
| Date | 199902 |
| Day | Fri |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : cap.vortac |
| State Reference | IL |
| Altitude | msl bound lower : 31000 msl bound upper : 33000 |
| Environment | |
| Flight Conditions | Mixed |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | L-1011 Tri-Star All Series |
| Operating Under FAR Part | Part 125 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level descent : intermediate altitude |
| Route In Use | enroute airway : ns.airway |
| Flight Plan | IFR |
| Aircraft 2 | |
| Controlling Facilities | artcc : zkc.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other vortac |
| Flight Phase | cruise : level descent : intermediate altitude |
| Route In Use | enroute airway : ns.airway |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : second officer |
| Qualification | pilot : instrument pilot : flight engineer pilot : commercial |
| ASRS Report | 728078 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : flight engineer pilot : atp |
| Experience | flight time last 90 days : 225 flight time total : 15000 flight time type : 1100 |
| ASRS Report | 428077 |
| Events | |
| Anomaly | altitude deviation : excursion from assigned altitude conflict : airborne less severe non adherence : clearance |
| Independent Detector | atc equipment other atc equipment : mode c other controllera |
| Resolutory Action | controller : issued alert controller : separated traffic |
| Miss Distance | horizontal : 0 vertical : 1000 |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Directed by ATC to descend (positive control area). During descent, ATC called and questioned altitude and clearance. Directed us to stop descent due to conflicting traffic. Cleared to descend after clear of traffic. Supplemental information from acn 428077: traffic passed under flight.
Original NASA ASRS Text
Title: AN L1011-100 DSNDS OUT OF ITS ASSIGNED ALT, THE CREW BELIEVING THAT THEY WERE GIVEN A DSCNT CLRNC BY ATC. ATC CTLR STOPS THE FLT AROUND FL320 FOR OPPOSITE DIRECTION TFC AT FL310.
Narrative: DIRECTED BY ATC TO DSND (PCA). DURING DSCNT, ATC CALLED AND QUESTIONED ALT AND CLRNC. DIRECTED US TO STOP DSCNT DUE TO CONFLICTING TFC. CLRED TO DSND AFTER CLR OF TFC. SUPPLEMENTAL INFO FROM ACN 428077: TFC PASSED UNDER 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.