A boeing 757 flight crew struck a bird on climb out from ord.

Attributes
ACN	438214
Time
Date	199905
Day	Wed
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : ord.airport
State Reference	IL
Altitude	msl single value : 4000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : c90.tracon
Operator	common carrier : air carrier
Make Model Name	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	climbout : intermediate altitude
Route In Use	departure : on vectors
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : multi engine pilot : commercial pilot : cfi
Experience	flight time last 90 days : 225 flight time total : 14000 flight time type : 3000
ASRS Report	438214
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument pilot : multi engine
Events
Anomaly	aircraft equipment problem : critical inflight encounter : birds
Independent Detector	other flight crewa other flight crewb
Resolutory Action	flight crew : diverted to another airport
Consequence	other
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

On climb out passing 4000 ft, we saw a large bird pass by the left side of the aircraft. Immediately noticed a hum or vibration and the vibration indicator 1.7 on the left engine while the right remained near zero. As we climbed the indication rose to a peak of 2.7. A flight attendant called shortly and reported a strange noise at the left mid-cabin door. We contacted dispatch and maintenance and elected to return to ord. Landing and rollout were normal. Indications in the cockpit were at near zero vibration and a visual inspection by the fire department showed no obvious damage. Visual inspection at the gate revealed damage to 3 engine blades (fan) about 6 inches along the blade and 3 inches deep.

Original NASA ASRS Text

Title: A BOEING 757 FLC STRUCK A BIRD ON CLBOUT FROM ORD.

Narrative: ON CLBOUT PASSING 4000 FT, WE SAW A LARGE BIRD PASS BY THE L SIDE OF THE ACFT. IMMEDIATELY NOTICED A HUM OR VIBRATION AND THE VIBRATION INDICATOR 1.7 ON THE L ENG WHILE THE R REMAINED NEAR ZERO. AS WE CLBED THE INDICATION ROSE TO A PEAK OF 2.7. A FLT ATTENDANT CALLED SHORTLY AND RPTED A STRANGE NOISE AT THE L MID-CABIN DOOR. WE CONTACTED DISPATCH AND MAINT AND ELECTED TO RETURN TO ORD. LNDG AND ROLLOUT WERE NORMAL. INDICATIONS IN THE COCKPIT WERE AT NEAR ZERO VIBRATION AND A VISUAL INSPECTION BY THE FIRE DEPT SHOWED NO OBVIOUS DAMAGE. VISUAL INSPECTION AT THE GATE REVEALED DAMAGE TO 3 ENG BLADES (FAN) ABOUT 6 INCHES ALONG THE BLADE AND 3 INCHES DEEP.

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.