Aircraft hits tug after pushback.

Attributes
ACN	447076
Time
Date	199908
Day	Thu
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : cvg.airport
State Reference	OH
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Regional Jet CL65, Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : cfi pilot : atp
Experience	flight time last 90 days : 230 flight time total : 3350 flight time type : 1500
ASRS Report	447076
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : multi engine pilot : atp
Events
Anomaly	aircraft equipment problem : less severe conflict : ground critical ground encounters : vehicle
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : insufficient time
Consequence	other other
Supplementary
Problem Areas	Aircraft Flight Crew Human Performance
Primary Problem	Aircraft

Narrative:

During pushback, we followed appropriate company checklists. As first officer, I was monitoring the engine parameters. At the conclusion of pushback, the ramp agent and captain exchanged parking brake set signals. The aircraft was stationary and then began to roll. We both applied the brakes, but only after contact had been made with tug and slight gear door damage occurred. I am not sure why this series of events took place, it appeared the parking brake was inoperative.

Original NASA ASRS Text

Title: ACFT HITS TUG AFTER PUSHBACK.

Narrative: DURING PUSHBACK, WE FOLLOWED APPROPRIATE COMPANY CHKLISTS. AS FO, I WAS MONITORING THE ENG PARAMETERS. AT THE CONCLUSION OF PUSHBACK, THE RAMP AGENT AND CAPT EXCHANGED PARKING BRAKE SET SIGNALS. THE ACFT WAS STATIONARY AND THEN BEGAN TO ROLL. WE BOTH APPLIED THE BRAKES, BUT ONLY AFTER CONTACT HAD BEEN MADE WITH TUG AND SLIGHT GEAR DOOR DAMAGE OCCURRED. I AM NOT SURE WHY THIS SERIES OF EVENTS TOOK PLACE, IT APPEARED THE PARKING BRAKE WAS INOP.

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.