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An S80 returns to phl when the PIC has difficulty in maintaining aircraft control. There had been a loud vibration from under the aircraft, near the nosewheel area.
| Attributes | |
| ACN | 407251 |
| Time | |
| Date | 199806 |
| Day | Sun |
| Local Time Of Day | 0601 To 1200 |
| Place | |
| Locale Reference | airport : phl |
| State Reference | PA |
| Altitude | msl bound lower : 2000 msl bound upper : 2000 |
| Environment | |
| Light | Daylight |
| Aircraft 1 | |
| Controlling Facilities | tower : phl tower : dfw |
| Operator | common carrier : air carrier |
| Make Model Name | MD-80 Super 80 |
| Operating Under FAR Part | Part 121 |
| Navigation In Use | Other |
| Flight Phase | climbout : initial other other |
| Flight Plan | IFR |
| Person 1 | |
| Affiliation | company : air carrier |
| Function | flight crew : captain oversight : pic |
| Qualification | pilot : atp |
| ASRS Report | 407251 |
| Person 2 | |
| Affiliation | company : air carrier |
| Function | flight crew : first officer |
| Qualification | pilot : commercial pilot : instrument |
| Events | |
| Anomaly | aircraft equipment problem : critical other anomaly other anomaly other |
| Independent Detector | other flight crewa |
| Resolutory Action | flight crew : declared emergency other |
| Consequence | Other |
| Supplementary | |
| Primary Problem | Aircraft |
| Air Traffic Incident | other |
Narrative:
Just after takeoff from phl, there was a loud vibration coming from under the nosewheel area of the cockpit. We climbed to 2000 ft and requested a return for landing. As I increased airspeed, the aircraft increasingly became unstable in the roll mode. We declared an emergency. The aircraft was unstable throughout the approach and landing. The landing was overweight but within table guidelines. Rollout and taxi back were normal. The crash/rescue vehicles did not notice any abnormalities during their area inspection.
Original NASA ASRS Text
Title: AN S80 RETURNS TO PHL WHEN THE PIC HAS DIFFICULTY IN MAINTAINING ACFT CTL. THERE HAD BEEN A LOUD VIBRATION FROM UNDER THE ACFT, NEAR THE NOSEWHEEL AREA.
Narrative: JUST AFTER TKOF FROM PHL, THERE WAS A LOUD VIBRATION COMING FROM UNDER THE NOSEWHEEL AREA OF THE COCKPIT. WE CLBED TO 2000 FT AND REQUESTED A RETURN FOR LNDG. AS I INCREASED AIRSPD, THE ACFT INCREASINGLY BECAME UNSTABLE IN THE ROLL MODE. WE DECLARED AN EMER. THE ACFT WAS UNSTABLE THROUGHOUT THE APCH AND LNDG. THE LNDG WAS OVERWT BUT WITHIN TABLE GUIDELINES. ROLLOUT AND TAXI BACK WERE NORMAL. THE CRASH/RESCUE VEHICLES DID NOT NOTICE ANY ABNORMALITIES DURING THEIR AREA INSPECTION.
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.