B737-400 had a bird strike departing sfo.

Attributes
ACN	627644
Time
Date	200408
Day	Fri
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : sfo.airport
State Reference	CA
Environment
Flight Conditions	VMC
Aircraft 1
Controlling Facilities	tower : sfo.tower
Operator	common carrier : air carrier
Make Model Name	B737-400
Operating Under FAR Part	Part 121
Flight Phase	climbout : takeoff
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	627644
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical inflight encounter : birds
Independent Detector	aircraft equipment other aircraft equipment : engine vibration monitor other flight crewa other flight crewb
Resolutory Action	controller : issued new clearance controller : provided flight assist flight crew : declared emergency flight crew : diverted to another airport flight crew : landed in emergency condition other
Consequence	other other
Supplementary
Problem Areas	Aircraft Environmental Factor
Primary Problem	Environmental Factor

Narrative:

On takeoff at liftoff we had a noticeable vibration. We looked at the engine parameters and noticed that engine #2 was indicating a vibration in excess of 4.5 units. We declared an emergency and returned to the field. All appropriate checklists were concluded before landing. Upon arrival at gate we were informed by maintenance that engine #2 had a large bird strike.

Original NASA ASRS Text

Title: B737-400 HAD A BIRD STRIKE DEPARTING SFO.

Narrative: ON TKOF AT LIFTOFF WE HAD A NOTICEABLE VIBRATION. WE LOOKED AT THE ENG PARAMETERS AND NOTICED THAT ENG #2 WAS INDICATING A VIBRATION IN EXCESS OF 4.5 UNITS. WE DECLARED AN EMER AND RETURNED TO THE FIELD. ALL APPROPRIATE CHKLISTS WERE CONCLUDED BEFORE LNDG. UPON ARR AT GATE WE WERE INFORMED BY MAINT THAT ENG #2 HAD A LARGE BIRD STRIKE.

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.