An air carrier large transport had an airspeed violation.

Attributes
ACN	311650
Time
Date	199507
Day	Sat
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dca
State Reference	DC
Altitude	msl bound lower : 5000 msl bound upper : 5000
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : dca
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	climbout : initial cruise other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : flight engineer pilot : instrument pilot : commercial
Experience	flight time total : 6500
ASRS Report	311650
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer pilot : cfi pilot : commercial pilot : instrument
Experience	flight time last 90 days : 150 flight time total : 9000 flight time type : 700
ASRS Report	311772
Events
Anomaly	aircraft equipment problem : less severe non adherence : far other anomaly other anomaly other
Independent Detector	other flight crewa
Resolutory Action	aircraft : equipment problem dissipated none taken : anomaly accepted
Consequence	Other
Supplementary
Primary Problem	Aircraft
Air Traffic Incident	Pilot Deviation

Narrative:

During takeoff, power was retarded to level off at 5000 ft. A thump was heard in the belly of the plane, all engine instruments were normal. Airspeed approached 280 KTS momentarily. We think the thump was a cargo shift.

Original NASA ASRS Text

Title: AN ACR LGT HAD AN AIRSPD VIOLATION.

Narrative: DURING TKOF, PWR WAS RETARDED TO LEVEL OFF AT 5000 FT. A THUMP WAS HEARD IN THE BELLY OF THE PLANE, ALL ENG INSTS WERE NORMAL. AIRSPD APCHED 280 KTS MOMENTARILY. WE THINK THE THUMP WAS A CARGO SHIFT.

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.