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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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An air carrier large transport flight crew allows the aircraft to descend through their cleared to altitude while looking for traffic. The traffic alert was from their TCASII, not ATC. ATC did not note the altitude deviation.
| Attributes | |
| ACN | 394790 |
| Time | |
| Date | 199802 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : fqf airport : den |
| State Reference | CO |
| Altitude | msl bound lower : 10600 msl bound upper : 11000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tracon : den |
| Operator | common carrier : air carrier |
| Make Model Name | Commercial Fixed Wing |
| Operating Under FAR Part | Part 121 |
| Flight Phase | cruise other descent other |
| Route In Use | arrival other enroute airway : den |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : flight engineer pilot : instrument pilot : atp pilot : commercial |
| Experience | flight time last 90 days : 150 flight time total : 3500 flight time type : 500 |
| ASRS Report | 394790 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer pilot : cfi |
| Experience | flight time last 90 days : 190 flight time total : 11000 flight time type : 450 |
| ASRS Report | 393585 |
| Events | |
| Anomaly | altitude deviation : overshoot non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : returned to intended course or assigned course |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Flight Crew Human Performance |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Descending from 12000 ft to 11000 ft we received a traffic alert advisory on TCASII. The target did not have an altitude readout. While we were focused on finding the traffic we descended past our altitude. When the altitude alert sounded the focus was drawn back inside. We'd descended to 10600 ft before correcting back to our assigned altitude of 11000 ft. No conflict was evident and nothing was said by denver approach.
Original NASA ASRS Text
Title: AN ACR LGT FLC ALLOWS THE ACFT TO DSND THROUGH THEIR CLRED TO ALT WHILE LOOKING FOR TFC. THE TFC ALERT WAS FROM THEIR TCASII, NOT ATC. ATC DID NOT NOTE THE ALTDEV.
Narrative: DSNDING FROM 12000 FT TO 11000 FT WE RECEIVED A TFC ALERT ADVISORY ON TCASII. THE TARGET DID NOT HAVE AN ALT READOUT. WHILE WE WERE FOCUSED ON FINDING THE TFC WE DSNDED PAST OUR ALT. WHEN THE ALT ALERT SOUNDED THE FOCUS WAS DRAWN BACK INSIDE. WE'D DSNDED TO 10600 FT BEFORE CORRECTING BACK TO OUR ASSIGNED ALT OF 11000 FT. NO CONFLICT WAS EVIDENT AND NOTHING WAS SAID BY DENVER APCH.
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.