Flight crew of a B737-500 heard a thud on the outside of the first officer cockpit, but noticed no abnormal aircraft control. After landing inspection revealed that it was a bird strike with no damage to the aircraft.

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Attributes
ACN	378631
Time
Date	199708
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : msp
State Reference	MN
Altitude	msl bound lower : 9000 msl bound upper : 9000
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	descent : approach descent other
Route In Use	enroute airway : msp
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time total : 17000 flight time type : 1500
ASRS Report	378631
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 180 flight time total : 8000 flight time type : 450
ASRS Report	378630
Events
Anomaly	inflight encounter other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : anomaly accepted
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

During approach to msp, cockpit crew heard slight tap on r- hand side of aircraft below and aft of first officer side window. Cabin crew heard nothing. Aircraft control was absolutely normal. Normal approach/landing. Suspected possible bird strike. I have experienced 2 previous bird strikes in the B737. In both previous cases, there was no doubt whatsoever that a bird strike had occurred. I inspected the area aft and below first officer's side window and found a small blood streak -- no damage to the aircraft skin was discernible.

Original NASA ASRS Text

Title: FLC OF A B737-500 HEARD A THUD ON THE OUTSIDE OF THE FO COCKPIT, BUT NOTICED NO ABNORMAL ACFT CTL. AFTER LNDG INSPECTION REVEALED THAT IT WAS A BIRD STRIKE WITH NO DAMAGE TO THE ACFT.

Narrative: DURING APCH TO MSP, COCKPIT CREW HEARD SLIGHT TAP ON R- HAND SIDE OF ACFT BELOW AND AFT OF FO SIDE WINDOW. CABIN CREW HEARD NOTHING. ACFT CTL WAS ABSOLUTELY NORMAL. NORMAL APCH/LNDG. SUSPECTED POSSIBLE BIRD STRIKE. I HAVE EXPERIENCED 2 PREVIOUS BIRD STRIKES IN THE B737. IN BOTH PREVIOUS CASES, THERE WAS NO DOUBT WHATSOEVER THAT A BIRD STRIKE HAD OCCURRED. I INSPECTED THE AREA AFT AND BELOW FO'S SIDE WINDOW AND FOUND A SMALL BLOOD STREAK -- NO DAMAGE TO THE ACFT SKIN WAS DISCERNIBLE.

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.