Air carrier rolls back into tug. Damaged.

Attributes
ACN	193367
Time
Date	199110
Day	Tue
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
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 : captain oversight : pic
Qualification	pilot : instrument pilot : commercial pilot : atp pilot : cfi
Experience	flight time last 90 days : 190 flight time total : 17000 flight time type : 12000
ASRS Report	193367
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp pilot : commercial pilot : instrument
Events
Anomaly	conflict : ground critical other anomaly other
Independent Detector	other flight crewa
Resolutory Action	none taken : unable
Consequence	other
Supplementary
Air Traffic Incident	other

Narrative:

Parked at gate in dtw, aircraft rolled back into tug damaging right aileron. Bad communication between cockpit and ground via nonstandard hand signals. Cockpit thought chocks were in place and were not. Signals should be precise and standard.

Original NASA ASRS Text

Title: ACR ROLLS BACK INTO TUG. DAMAGED.

Narrative: PARKED AT GATE IN DTW, ACFT ROLLED BACK INTO TUG DAMAGING R AILERON. BAD COM BTWN COCKPIT AND GND VIA NONSTANDARD HAND SIGNALS. COCKPIT THOUGHT CHOCKS WERE IN PLACE AND WERE NOT. SIGNALS SHOULD BE PRECISE AND STANDARD.

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.