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A BE99 on slow descent passed through assigned altitude due to captain's altimeter failure. Altimeter stuck at 4100 ft previously reported.
| Attributes | |
| ACN | 635899 |
| Time | |
| Date | 200411 |
| Day | Tue |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : zzz.airport |
| State Reference | US |
| Altitude | msl bound lower : 3760 msl bound upper : 4100 |
| Environment | |
| Flight Conditions | Marginal |
| Light | Dawn |
| Aircraft 1 | |
| Controlling Facilities | artcc : zzz.artcc |
| Operator | common carrier : air taxi |
| Make Model Name | Airliner 99 |
| Operating Under FAR Part | Part 135 |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air taxi |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : cfi pilot : commercial pilot : instrument pilot : multi engine |
| Experience | flight time last 90 days : 80 flight time total : 12100 flight time type : 4000 |
| ASRS Report | 635899 |
| Person 2 | |
| Affiliation | company : air taxi |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure |
| Independent Detector | aircraft equipment other aircraft equipment : fo altimeter other flight crewa other flight crewb |
| Resolutory Action | controller : provided flight assist flight crew : overcame equipment problem flight crew : returned to assigned altitude |
| Consequence | other |
| Factors | |
| Maintenance | performance deficiency : repair performance deficiency : testing |
| Supplementary | |
| Problem Areas | Chart Or Publication Aircraft Maintenance Human Performance |
| Primary Problem | Maintenance Human Performance |
Narrative:
Cleared to descend from 6000 ft to 4000 ft. Initiated slow descent. Captain altimeter read 4100 ft when I noticed copilot's altimeter indicated 3760 ft. I pulled up, and was climbing as ATC queried my assigned altitude. The primary altimeter had stuck on 4100 ft. This altimeter had done the same thing on a flight on oct/wed/04 or oct/thu/04 and had been reported to maintenance by me, after which I was assured the lines and instrument had been 'blown out.' I have reported this incident to maintenance this date (nov/tue/04).
Original NASA ASRS Text
Title: A BE99 ON SLOW DSCNT PASSED THROUGH ASSIGNED ALT DUE TO CAPT'S ALTIMETER FAILURE. ALTIMETER STUCK AT 4100 FT PREVIOUSLY RPTED.
Narrative: CLRED TO DSND FROM 6000 FT TO 4000 FT. INITIATED SLOW DSCNT. CAPT ALTIMETER READ 4100 FT WHEN I NOTICED COPLT'S ALTIMETER INDICATED 3760 FT. I PULLED UP, AND WAS CLBING AS ATC QUERIED MY ASSIGNED ALT. THE PRIMARY ALTIMETER HAD STUCK ON 4100 FT. THIS ALTIMETER HAD DONE THE SAME THING ON A FLT ON OCT/WED/04 OR OCT/THU/04 AND HAD BEEN RPTED TO MAINT BY ME, AFTER WHICH I WAS ASSURED THE LINES AND INST HAD BEEN 'BLOWN OUT.' I HAVE RPTED THIS INCIDENT TO MAINT THIS DATE (NOV/TUE/04).
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.