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A pilot in an small transport finds that he cannot trim the pitch of the aircraft and he suspects that the trim jack screw was iced up.
| Attributes | |
| ACN | 385985 |
| Time | |
| Date | 199711 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | atc facility : jax |
| State Reference | FL |
| Altitude | msl bound lower : 32800 msl bound upper : 33200 |
| Environment | |
| Flight Conditions | VMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx |
| Operator | general aviation : personal |
| Make Model Name | Any Unknown or Unlisted Aircraft Manufacturer |
| Operating Under FAR Part | Part 91 |
| Flight Phase | cruise other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | Other |
| Function | flight crew : single pilot |
| Qualification | pilot : private pilot : instrument |
| Experience | flight time last 90 days : 31 flight time total : 3204 flight time type : 31 |
| ASRS Report | 385985 |
| Person 2 | |
| Affiliation | government : faa |
| Function | controller : radar |
| Qualification | controller : radar |
| Events | |
| Anomaly | aircraft equipment problem : critical altitude deviation : excursion from assigned altitude non adherence : far non adherence : clearance other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : unspecified other flight crewa |
| Resolutory Action | flight crew : declared emergency none taken : detected after the fact |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
Narrative:
Upon leveling off at FL330, found altitude hold increasingly erratic and eventually non functional. Finally had to hand fly aircraft to destination. Found it difficult to hold aircraft to altdevs up to +/-200 ft from FL330 level. Determined that 'trim' was frozen (presumably due to contamination of water or moisture). Unable to properly trim, even manually. Will be corrected by simply lubricating with fresh lubricant, I believe.
Original NASA ASRS Text
Title: A PLT IN AN SMT FINDS THAT HE CANNOT TRIM THE PITCH OF THE ACFT AND HE SUSPECTS THAT THE TRIM JACK SCREW WAS ICED UP.
Narrative: UPON LEVELING OFF AT FL330, FOUND ALT HOLD INCREASINGLY ERRATIC AND EVENTUALLY NON FUNCTIONAL. FINALLY HAD TO HAND FLY ACFT TO DEST. FOUND IT DIFFICULT TO HOLD ACFT TO ALTDEVS UP TO +/-200 FT FROM FL330 LEVEL. DETERMINED THAT 'TRIM' WAS FROZEN (PRESUMABLY DUE TO CONTAMINATION OF WATER OR MOISTURE). UNABLE TO PROPERLY TRIM, EVEN MANUALLY. WILL BE CORRECTED BY SIMPLY LUBRICATING WITH FRESH LUBRICANT, I BELIEVE.
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.