The aircraft was not chocked and it rolled into ground equipment causing damage.

Attributes
ACN	466185
Time
Date	200003
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : grr.airport
State Reference	MI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB 314 Super Tucano
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 240 flight time total : 14000 flight time type : 650
ASRS Report	466185
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : multi engine pilot : instrument pilot : commercial
Events
Anomaly	ground encounters : vehicle non adherence : published procedure
Independent Detector	other other : 3
Resolutory Action	none taken : detected after the fact
Consequence	other other
Supplementary
Problem Areas	Flight Crew Human Performance Company
Primary Problem	Company

Narrative:

Aircraft drifted back hitting belt loader. Brake not properly set. Ramp agent had not chocked the aircraft before offloading bags. Aircraft drifted back and put a puncture hole next to access panel. Damage area measured approximately 1 1/2 inches by 2 inches in diameter. I was notified after passenger and bags were off the aircraft that we had drifted back and damage occurred to aircraft. Noted damage in aircraft log. Notified maintenance of what had happened and of write-ups in logbook. Corrective action. Absolutely make sure that brakes are set. Never assume that the aircraft is checked.

Original NASA ASRS Text

Title: THE ACFT WAS NOT CHOCKED AND IT ROLLED INTO GND EQUIP CAUSING DAMAGE.

Narrative: ACFT DRIFTED BACK HITTING BELT LOADER. BRAKE NOT PROPERLY SET. RAMP AGENT HAD NOT CHOCKED THE ACFT BEFORE OFFLOADING BAGS. ACFT DRIFTED BACK AND PUT A PUNCTURE HOLE NEXT TO ACCESS PANEL. DAMAGE AREA MEASURED APPROX 1 1/2 INCHES BY 2 INCHES IN DIAMETER. I WAS NOTIFIED AFTER PAX AND BAGS WERE OFF THE ACFT THAT WE HAD DRIFTED BACK AND DAMAGE OCCURRED TO ACFT. NOTED DAMAGE IN ACFT LOG. NOTIFIED MAINT OF WHAT HAD HAPPENED AND OF WRITE-UPS IN LOGBOOK. CORRECTIVE ACTION. ABSOLUTELY MAKE SURE THAT BRAKES ARE SET. NEVER ASSUME THAT THE ACFT IS CHKED.

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.