Return land mandated by engine vibration in a F-100.

Attributes
ACN	300054
Time
Date	199503
Day	Sat
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dfw
State Reference	TX
Altitude	msl bound lower : 12000 msl bound upper : 12000
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dfw tower : ewr
Operator	common carrier : air carrier
Make Model Name	Fokker 100
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : intermediate altitude other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	300054
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	aircraft equipment problem : critical
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

Climbing through 12000 ft I selected maximum control on trust- rating panel to speed the climb through chop. Seconds later we got an engine #2 vibration high EICAS message. Engine 2 N2 vibration indicated top of scale with vibration apparent in the seat. We selected alternate per checklist with no change then retarded the throttle. Up to this time all other engine indications were well within normal. Vibration decreased with reduced throttle. Returned to dfw with dispatch and tul technician concurrence. Landing at dfw was overweight gross weight 89.7 pounds touchdown less than 100 FPM smooth. Emergency was declared for return -- engine was left at idle but ran normally until touchdown.

Original NASA ASRS Text

Title: RETURN LAND MANDATED BY ENG VIBRATION IN A F-100.

Narrative: CLBING THROUGH 12000 FT I SELECTED MAX CTL ON TRUST- RATING PANEL TO SPD THE CLB THROUGH CHOP. SECONDS LATER WE GOT AN ENG #2 VIBRATION HIGH EICAS MESSAGE. ENG 2 N2 VIBRATION INDICATED TOP OF SCALE WITH VIBRATION APPARENT IN THE SEAT. WE SELECTED ALTERNATE PER CHKLIST WITH NO CHANGE THEN RETARDED THE THROTTLE. UP TO THIS TIME ALL OTHER ENG INDICATIONS WERE WELL WITHIN NORMAL. VIBRATION DECREASED WITH REDUCED THROTTLE. RETURNED TO DFW WITH DISPATCH AND TUL TECHNICIAN CONCURRENCE. LNDG AT DFW WAS OVERWT GROSS WT 89.7 LBS TOUCHDOWN LESS THAN 100 FPM SMOOTH. EMER WAS DECLARED FOR RETURN -- ENG WAS LEFT AT IDLE BUT RAN NORMALLY UNTIL TOUCHDOWN.

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.