Improper chock placement. Ramp operation aircraft parking procedure.

Attributes
ACN	295197
Time
Date	199501
Day	Fri
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : dtw
State Reference	MI
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Controlling Facilities	artcc : zny
Operator	common carrier : air carrier
Make Model Name	Commercial Fixed Wing
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 200 flight time total : 20000 flight time type : 2000
ASRS Report	295197
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : commercial
Events
Anomaly	non adherence other other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control other
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Taxiing in to the gate at dtw. At gate, a visual signal given by ramp marshaller of 'chocks in' observed by captain and first officer. Brakes released. Aircraft slowly started rolling backwards. Aircraft stopped by reapplying brakes. No one injured and aircraft made no contact with anything. 'There were no chocks at all.' a new marshaller arrived approximately 2 mins later with chocks and installed them. Aircraft was safely deplaned.

Original NASA ASRS Text

Title: IMPROPER CHOCK PLACEMENT. RAMP OP ACFT PARKING PROC.

Narrative: TAXIING IN TO THE GATE AT DTW. AT GATE, A VISUAL SIGNAL GIVEN BY RAMP MARSHALLER OF 'CHOCKS IN' OBSERVED BY CAPT AND FO. BRAKES RELEASED. ACFT SLOWLY STARTED ROLLING BACKWARDS. ACFT STOPPED BY REAPPLYING BRAKES. NO ONE INJURED AND ACFT MADE NO CONTACT WITH ANYTHING. 'THERE WERE NO CHOCKS AT ALL.' A NEW MARSHALLER ARRIVED APPROX 2 MINS LATER WITH CHOCKS AND INSTALLED THEM. ACFT WAS SAFELY DEPLANED.

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.