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37000 Feet | Browse and search NASA's Aviation Safety Reporting System |
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A cpr flight crew in an light transport descend below their assigned altitude when the autoplt failed to level off and the flight crew was distraction by a traffic call from the controller. Altitude alerter notification.
| Attributes | |
| ACN | 371151 |
| Time | |
| Date | 199706 |
| Day | Sat |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | atc facility : jfn |
| State Reference | OH |
| Altitude | msl bound lower : 12000 msl bound upper : 13000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob |
| Operator | general aviation : corporate |
| Make Model Name | Light Transport, Low Wing, 2 Turbojet Eng |
| Navigation In Use | Other |
| Flight Phase | descent other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 85 flight time total : 13000 flight time type : 1200 |
| ASRS Report | 371151 |
| Person 2 | |
| Affiliation | Other |
| Function | flight crew : first officer |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 150 flight time total : 8600 flight time type : 12 |
| ASRS Report | 371560 |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance non adherence : far |
| Independent Detector | other controllera 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:
While descending to 13000 ft northeast of ziter intersection, ATC called traffic at 2 O'clock, level 12000 ft. Both crew members were looking for the traffic when the altitude alerter advised us that the altitude pre-select had failed to stop the descent at 13000 ft. PF quickly uncoupled and corrected before center called and asked for altitude verification. The electronic gadgets don't always work and at least this time it failed when we were counting on it. Better vigilance called for.
Original NASA ASRS Text
Title: A CPR FLC IN AN LTT DSND BELOW THEIR ASSIGNED ALT WHEN THE AUTOPLT FAILED TO LEVEL OFF AND THE FLC WAS DISTR BY A TFC CALL FROM THE CTLR. ALT ALERTER NOTIFICATION.
Narrative: WHILE DSNDING TO 13000 FT NE OF ZITER INTXN, ATC CALLED TFC AT 2 O'CLOCK, LEVEL 12000 FT. BOTH CREW MEMBERS WERE LOOKING FOR THE TFC WHEN THE ALT ALERTER ADVISED US THAT THE ALT PRE-SELECT HAD FAILED TO STOP THE DSCNT AT 13000 FT. PF QUICKLY UNCOUPLED AND CORRECTED BEFORE CTR CALLED AND ASKED FOR ALT VERIFICATION. THE ELECTRONIC GADGETS DON'T ALWAYS WORK AND AT LEAST THIS TIME IT FAILED WHEN WE WERE COUNTING ON IT. BETTER VIGILANCE CALLED FOR.
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.