MD80 crew had reported vibration in the cabin attendant.

Attributes
ACN	531647
Time
Date	200112
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : las.airport intersection : 18
State Reference	NV
Altitude	msl bound lower : 500 msl bound upper : 1000
Environment
Light	Dusk
Aircraft 1
Controlling Facilities	tracon : l30.tracon
Operator	common carrier : air carrier
Make Model Name	MD-80 Super 80
Operating Under FAR Part	Part 121
Flight Phase	climbout : initial
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
ASRS Report	531647
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	531648
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : n1 indicators other other : 3
Resolutory Action	none taken : anomaly accepted other
Consequence	other other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

While climbing through 500 ft on the las departure, the captain received a call from the #4 flight attendant. The flight attendant reported a strange vibration from the rear of the plane. We xchecked the engine instruments to find the engine N1/south split 3 to 4 percent and all other indications normal. Disconnected the autothrottles in order to sync the N1/south. Upon syncing the N1/south the captain called the #4 flight attendant. The flight attendant stated the vibration had ceased. We then duplicated the sound by again aligning eprs rather than the N1/south. The flight attendant confirmed the sound while the engines were out of sync and reported its absence while the N1/south were corrected. We continued the flight and completed the book checklist for engine sync unsatisfactory. The remainder of the flight was uneventful.

Original NASA ASRS Text

Title: MD80 CREW HAD RPTED VIBRATION IN THE CAB.

Narrative: WHILE CLBING THROUGH 500 FT ON THE LAS DEP, THE CAPT RECEIVED A CALL FROM THE #4 FLT ATTENDANT. THE FLT ATTENDANT RPTED A STRANGE VIBRATION FROM THE REAR OF THE PLANE. WE XCHECKED THE ENG INSTS TO FIND THE ENG N1/S SPLIT 3 TO 4 PERCENT AND ALL OTHER INDICATIONS NORMAL. DISCONNECTED THE AUTOTHROTTLES IN ORDER TO SYNC THE N1/S. UPON SYNCING THE N1/S THE CAPT CALLED THE #4 FLT ATTENDANT. THE FLT ATTENDANT STATED THE VIBRATION HAD CEASED. WE THEN DUPLICATED THE SOUND BY AGAIN ALIGNING EPRS RATHER THAN THE N1/S. THE FLT ATTENDANT CONFIRMED THE SOUND WHILE THE ENGS WERE OUT OF SYNC AND RPTED ITS ABSENCE WHILE THE N1/S WERE CORRECTED. WE CONTINUED THE FLT AND COMPLETED THE BOOK CHECKLIST FOR ENG SYNC UNSATISFACTORY. THE REMAINDER OF THE FLT WAS UNEVENTFUL.

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.