Flight crew of an medium large transport air carrier aircraft declared an emergency and returned to land after hearing a loud vibration after takeoff.

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Attributes
ACN	258889
Time
Date	199312
Day	Mon
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : mco
State Reference	FL
Altitude	agl bound lower : 0 agl bound upper : 500
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	tower : mco
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Navigation In Use	Other
Flight Phase	climbout : takeoff climbout : initial other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : flight engineer pilot : cfi pilot : atp
Experience	flight time last 90 days : 200 flight time total : 15000 flight time type : 3000
ASRS Report	258889
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : less severe other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : declared emergency other
Consequence	Other
Supplementary
Primary Problem	Aircraft

Narrative:

After takeoff and landing gear retraction, a very loud and violent vibration existed in the airframe. I elected to return to the airport. I declared an emergency. A normal landing was accomplished. After stopping aircraft, maintenance personnel examined aircraft and found left front nose gear door unlatched.

Original NASA ASRS Text

Title: FLC OF AN MLG ACR ACFT DECLARED AN EMER AND RETURNED TO LAND AFTER HEARING A LOUD VIBRATION AFTER TKOF.

Narrative: AFTER TKOF AND LNDG GEAR RETRACTION, A VERY LOUD AND VIOLENT VIBRATION EXISTED IN THE AIRFRAME. I ELECTED TO RETURN TO THE ARPT. I DECLARED AN EMER. A NORMAL LNDG WAS ACCOMPLISHED. AFTER STOPPING ACFT, MAINT PERSONNEL EXAMINED ACFT AND FOUND L FRONT NOSE GEAR DOOR UNLATCHED.

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.