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Aileron servo indicator on a DC9-30 indicates an out of trim condition which later was found to be associated with an accumulation of ice in the wheel well, binding the aileron control cables. Precautionary diversion to mke, wi.
| Attributes | |
| ACN | 546569 |
| Time | |
| Date | 200205 |
| Day | Mon |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | navaid : crl.vortac |
| State Reference | MI |
| Altitude | msl single value : 33000 |
| Environment | |
| Flight Conditions | VMC |
| Weather Elements | other |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | artcc : zob.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | DC-9 30 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | 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 : 13000 flight time type : 8000 |
| ASRS Report | 546569 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other |
| Independent Detector | aircraft equipment other aircraft equipment : aileron servo ind other flight crewa |
| Resolutory Action | flight crew : overrode automation flight crew : landed as precaution flight crew : diverted to another airport |
| Consequence | other other Other |
| Supplementary | |
| Problem Areas | Flight Crew Human Performance Airport Aircraft Weather |
| Primary Problem | Aircraft |
Narrative:
During cruise, noticed aileron servo indicator showed full deflection. Control wheel and all other indications looked normal. Disconnected autoplt. Airplane started a slow roll to the left. Applied right aileron force to stop roll. Noticed control wheel force moderate to heavy to the right. Exerted moderate force and felt a 'pop' in the wheel. We were able to control flight with ailerons, but could feel a 'binding' in the wheel. SELCAL'ed dispatch and maintenance. Decided to divert to mke. Uneventful landing and postflt inspection. Discovered ice in wheel well area and around pulley assemblies.
Original NASA ASRS Text
Title: AILERON SERVO INDICATOR ON A DC9-30 INDICATES AN OUT OF TRIM CONDITION WHICH LATER WAS FOUND TO BE ASSOCIATED WITH AN ACCUMULATION OF ICE IN THE WHEEL WELL, BINDING THE AILERON CTL CABLES. PRECAUTIONARY DIVERSION TO MKE, WI.
Narrative: DURING CRUISE, NOTICED AILERON SERVO INDICATOR SHOWED FULL DEFLECTION. CTL WHEEL AND ALL OTHER INDICATIONS LOOKED NORMAL. DISCONNECTED AUTOPLT. AIRPLANE STARTED A SLOW ROLL TO THE L. APPLIED R AILERON FORCE TO STOP ROLL. NOTICED CTL WHEEL FORCE MODERATE TO HVY TO THE R. EXERTED MODERATE FORCE AND FELT A 'POP' IN THE WHEEL. WE WERE ABLE TO CTL FLT WITH AILERONS, BUT COULD FEEL A 'BINDING' IN THE WHEEL. SELCAL'ED DISPATCH AND MAINT. DECIDED TO DIVERT TO MKE. UNEVENTFUL LNDG AND POSTFLT INSPECTION. DISCOVERED ICE IN WHEEL WELL AREA AND AROUND PULLEY ASSEMBLIES.
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.