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MD90 flight crew felt aircraft vibration and heard thump during high level cruise and descent. Postflt inspection found damage to inboard leading edge slat and forward potable water leak.
| Attributes | |
| ACN | 562599 |
| Time | |
| Date | 200210 |
| Day | Tue |
| Local Time Of Day | 1801 To 2400 |
| Place | |
| Locale Reference | airport : pbi.airport |
| State Reference | FL |
| Altitude | msl single value : 27000 |
| Environment | |
| Flight Conditions | VMC |
| Light | Night |
| Aircraft 1 | |
| Controlling Facilities | artcc : zma.artcc |
| Operator | common carrier : air carrier |
| Make Model Name | MD-90 Series (DC-9-90) Undifferentiated or Other Model |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | other |
| Flight Phase | descent : intermediate altitude |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp pilot : flight engineer |
| Experience | flight time last 90 days : 150 flight time total : 10000 flight time type : 3000 |
| ASRS Report | 562599 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Events | |
| Anomaly | aircraft equipment problem : less severe other anomaly other |
| Independent Detector | other flight crewa other flight crewb |
| Resolutory Action | none taken : anomaly accepted none taken : unable |
| Consequence | other |
| Supplementary | |
| Problem Areas | Aircraft |
| Primary Problem | Aircraft |
Narrative:
In cruise at FL330 we noticed a very slight vibration similar to a vibrating nose gear door or out of sync engine. On descent vibration increased slightly as airspeed increased. At approximately 310 KIAS and 27000 ft I decided to slow down to see if the vibration would lesson again. When autoplt mode was changed from mach to IAS there was a slight pitch up. At this time we heard a thump and the vibration stopped. There were no other abnormal indications. Upon ground inspection we found damage to the right wing inboard leading edge slat. There was also a potable water leak on the forward underside of the airplane.
Original NASA ASRS Text
Title: MD90 FLC FELT ACFT VIBRATION AND HEARD THUMP DURING HIGH LEVEL CRUISE AND DSCNT. POSTFLT INSPECTION FOUND DAMAGE TO INBOARD LEADING EDGE SLAT AND FORWARD POTABLE WATER LEAK.
Narrative: IN CRUISE AT FL330 WE NOTICED A VERY SLIGHT VIBRATION SIMILAR TO A VIBRATING NOSE GEAR DOOR OR OUT OF SYNC ENG. ON DSCNT VIBRATION INCREASED SLIGHTLY AS AIRSPD INCREASED. AT APPROX 310 KIAS AND 27000 FT I DECIDED TO SLOW DOWN TO SEE IF THE VIBRATION WOULD LESSON AGAIN. WHEN AUTOPLT MODE WAS CHANGED FROM MACH TO IAS THERE WAS A SLIGHT PITCH UP. AT THIS TIME WE HEARD A THUMP AND THE VIBRATION STOPPED. THERE WERE NO OTHER ABNORMAL INDICATIONS. UPON GND INSPECTION WE FOUND DAMAGE TO THE R WING INBOARD LEADING EDGE SLAT. THERE WAS ALSO A POTABLE WATER LEAK ON THE FORWARD UNDERSIDE OF THE AIRPLANE.
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.