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An MD88 climbs 300 ft above its assigned altitude when the #1 dfgc is unable to retrim the aircraft 100 mi ssw of atl, GA.
| Attributes | |
| ACN | 495820 |
| Time | |
| Date | 200012 |
| Day | Fri |
| Local Time Of Day | 1201 To 1800 |
| Place | |
| Locale Reference | airport : atl.airport |
| State Reference | GA |
| Altitude | msl bound lower : 27000 msl bound upper : 27300 |
| Environment | |
| Flight Conditions | IMC |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zjx.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-88 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | climbout : intermediate altitude cruise : level |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| Experience | flight time last 90 days : 180 flight time total : 8000 flight time type : 1400 |
| ASRS Report | 495820 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : instrument pilot : multi engine pilot : commercial |
| Events | |
| Anomaly | aircraft equipment problem : less severe altitude deviation : overshoot non adherence : clearance other anomaly |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : regained aircraft control flight crew : returned to assigned altitude |
| Consequence | other other |
| Supplementary | |
| Problem Areas | Aircraft Flight Crew Human Performance |
| Primary Problem | Aircraft |
| Air Traffic Incident | Pilot Deviation |
Narrative:
Climbing out of atl to FL270 with VNAV engaged, aircraft started to level at FL270. VNAV capture then VNAV level was annunciated. The aircraft paused at FL270 then started a rapid climb with VNAV level still annunciated. The autoplt was disengaged immediately along with the autothrottles. The aircraft was grossly out of trim (nose up) with trim light on. Approximately maximum altitude attained was FL273 before the climb was arrested. We switched to #2 dfgc and the remainder of the flight was uneventful. The aircraft was written up.
Original NASA ASRS Text
Title: AN MD88 CLBS 300 FT ABOVE ITS ASSIGNED ALT WHEN THE #1 DFGC IS UNABLE TO RETRIM THE ACFT 100 MI SSW OF ATL, GA.
Narrative: CLBING OUT OF ATL TO FL270 WITH VNAV ENGAGED, ACFT STARTED TO LEVEL AT FL270. VNAV CAPTURE THEN VNAV LEVEL WAS ANNUNCIATED. THE ACFT PAUSED AT FL270 THEN STARTED A RAPID CLB WITH VNAV LEVEL STILL ANNUNCIATED. THE AUTOPLT WAS DISENGAGED IMMEDIATELY ALONG WITH THE AUTOTHROTTLES. THE ACFT WAS GROSSLY OUT OF TRIM (NOSE UP) WITH TRIM LIGHT ON. APPROX MAX ALT ATTAINED WAS FL273 BEFORE THE CLB WAS ARRESTED. WE SWITCHED TO #2 DFGC AND THE REMAINDER OF THE FLT WAS UNEVENTFUL. THE ACFT WAS WRITTEN UP.
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.