An air carrier mdt jet takes off after pushback with the nose gear pin still installed. Ground agent had displayed a gear pin that was assumed to be from the departure aircraft but was not.

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Attributes
ACN	410590
Time
Date	199808
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg
State Reference	OH
Altitude	agl bound lower : 0 agl bound upper : 200
Environment
Flight Conditions	Mixed
Light	Daylight
Aircraft 1
Controlling Facilities	tracon : cvg tower : cvg
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 : takeoff climbout : initial ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : cfi pilot : atp
Experience	flight time last 90 days : 150 flight time total : 17000 flight time type : 4500
ASRS Report	410590
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Events
Anomaly	aircraft equipment problem : critical non adherence : published procedure other anomaly other
Independent Detector	aircraft equipment other aircraft equipment : unspecified other flight crewa
Resolutory Action	other
Consequence	Other
Supplementary
Air Traffic Incident	Pilot Deviation other

Narrative:

Nose gear failed to retract after takeoff. After consulting QRH we returned to departure airport. Nose pin was found to be still installed in nose gear. Aircraft was pushed back in heavy rain with additional baggage loaded prior to departing the gate. It later was discovered that an agent had showed us a gear pin from another tug. Apparently it was thought we were pushed without nose pin installed.

Original NASA ASRS Text

Title: AN ACR MDT JET TAKES OFF AFTER PUSHBACK WITH THE NOSE GEAR PIN STILL INSTALLED. GND AGENT HAD DISPLAYED A GEAR PIN THAT WAS ASSUMED TO BE FROM THE DEP ACFT BUT WAS NOT.

Narrative: NOSE GEAR FAILED TO RETRACT AFTER TKOF. AFTER CONSULTING QRH WE RETURNED TO DEP ARPT. NOSE PIN WAS FOUND TO BE STILL INSTALLED IN NOSE GEAR. ACFT WAS PUSHED BACK IN HVY RAIN WITH ADDITIONAL BAGGAGE LOADED PRIOR TO DEPARTING THE GATE. IT LATER WAS DISCOVERED THAT AN AGENT HAD SHOWED US A GEAR PIN FROM ANOTHER TUG. APPARENTLY IT WAS THOUGHT WE WERE PUSHED WITHOUT NOSE PIN INSTALLED.

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.