Brakes released when advised chocks in place. Aircraft rolled back struck tug.

Attributes
ACN	193101
Time
Date	199110
Day	Tue
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : dtw
State Reference	MI
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Medium Large Transport, Low Wing, 2 Turbojet Eng
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : instrument pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 7000 flight time type : 3000
ASRS Report	193101
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa other other : unspecified
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	other

Narrative:

After aircraft parked at gate, ground personnel gave signal that chocks were in behind wheels. Captain released parking brake and aircraft rolled back after 3 ft and hit tug. Ramp was dry. Right aileron tab damaged.

Original NASA ASRS Text

Title: BRAKES RELEASED WHEN ADVISED CHOCKS IN PLACE. ACFT ROLLED BACK STRUCK TUG.

Narrative: AFTER ACFT PARKED AT GATE, GND PERSONNEL GAVE SIGNAL THAT CHOCKS WERE IN BEHIND WHEELS. CAPT RELEASED PARKING BRAKE AND ACFT ROLLED BACK AFTER 3 FT AND HIT TUG. RAMP WAS DRY. R AILERON TAB DAMAGED.

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.