The reporter experienced vibration and roll control problems.

Attributes
ACN	318999
Time
Date	199510
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	atc facility : zdc airport : phl airport : gso
State Reference	DC
Altitude	msl bound lower : 27000 msl bound upper : 27000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	artcc : zdc
Operator	common carrier : air carrier
Make Model Name	B737-300
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude cruise other descent other
Route In Use	enroute other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 35000 flight time type : 2000
ASRS Report	318999
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	aircraft equipment problem : critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency flight crew : overcame equipment problem
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

On climb out from phl experienced vibration along with excessive aileron and rudder trim setting requirement to maintain straight and level flight. En route and at top of descent, had first officer make a visual cabin inspection of trailing edge, leading edge, spoilers and engines, finding nothing abnormal. Checked aircraft per QRH (quick reference handbook) and gso maintenance and did a check of yaw damper, hydraulic pump and system, autoplt, etc, finding nothing to correct our aircraft vibration or roll problem. Required 4 degree right rudder trim, and from 2 degree left through 4 degree right aileron trim to maintain wings level. Vibration continued until approximately 200 KTS on final approach gso. Rolled emergency equipment gso, requested ATC radar vector for straight in approach with a 25 mi straight in approach to runway 23 gso. Elected 15 degree flap landing after excessive yaw bump on flap extension 2 degrees. Landing uneventful. Callback conversation with reporter revealed the following information: the reporter stated he was flying a boeing B737-300. He did not consider turning off the yaw damper because the yaw damper index was centered. There were no passenger or flight attendant complaints. There was no icing. After landing and filling out the paperwork and debriefing the chief pilot he was given another airplane to complete his trip. He never was told what was found to be wrong with the airplane.

Original NASA ASRS Text

Title: THE RPTR EXPERIENCED VIBRATION AND ROLL CTL PROBS.

Narrative: ON CLB OUT FROM PHL EXPERIENCED VIBRATION ALONG WITH EXCESSIVE AILERON AND RUDDER TRIM SETTING REQUIREMENT TO MAINTAIN STRAIGHT AND LEVEL FLT. ENRTE AND AT TOP OF DSCNT, HAD FO MAKE A VISUAL CABIN INSPECTION OF TRAILING EDGE, LEADING EDGE, SPOILERS AND ENGS, FINDING NOTHING ABNORMAL. CHKED ACFT PER QRH (QUICK REF HANDBOOK) AND GSO MAINT AND DID A CHK OF YAW DAMPER, HYDRAULIC PUMP AND SYS, AUTOPLT, ETC, FINDING NOTHING TO CORRECT OUR ACFT VIBRATION OR ROLL PROB. REQUIRED 4 DEG R RUDDER TRIM, AND FROM 2 DEG L THROUGH 4 DEG R AILERON TRIM TO MAINTAIN WINGS LEVEL. VIBRATION CONTINUED UNTIL APPROX 200 KTS ON FINAL APCH GSO. ROLLED EMER EQUIP GSO, REQUESTED ATC RADAR VECTOR FOR STRAIGHT IN APCH WITH A 25 MI STRAIGHT IN APCH TO RWY 23 GSO. ELECTED 15 DEG FLAP LNDG AFTER EXCESSIVE YAW BUMP ON FLAP EXTENSION 2 DEGS. LNDG UNEVENTFUL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED HE WAS FLYING A BOEING B737-300. HE DID NOT CONSIDER TURNING OFF THE YAW DAMPER BECAUSE THE YAW DAMPER INDEX WAS CTRED. THERE WERE NO PAX OR FLT ATTENDANT COMPLAINTS. THERE WAS NO ICING. AFTER LNDG AND FILLING OUT THE PAPERWORK AND DEBRIEFING THE CHIEF PLT HE WAS GIVEN ANOTHER AIRPLANE TO COMPLETE HIS TRIP. HE NEVER WAS TOLD WHAT WAS FOUND TO BE WRONG WITH 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.