Flight crew of CL65 releases brake after chocks in signal is given. Aircraft rolls back 4-6 ft.

Attributes
ACN	330233
Time
Date	199603
Day	Mon
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : yul
State Reference	PQ
Altitude	agl bound lower : 0 agl bound upper : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	Challenger CL604
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
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 : 10800 flight time type : 1800
ASRS Report	330233
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial pilot : instrument
Experience	flight time last 90 days : 260 flight time total : 5180
ASRS Report	330622
Events
Anomaly	conflict : nmac conflict : airborne less severe other spatial deviation
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact none taken : insufficient time
Consequence	other
Supplementary
Air Traffic Incident	other

Narrative:

CL65 aircraft was parked at gate X, cyul. Aircraft was only chocked with one chock in front of nose gear. Signal was given for chocks in and I released the parking brake. Approximately 3-5 mins later the aircraft rolled back 4-6 ft striking a baggage cart and a bag loader. Damage was to the left wing inboard flap hinge fairings and stripped paint on the trailing edge of the left winglet. The aircraft was improperly chocked allowing it to roll on the ramp. Confusion on the apparent hand signals for the chocking of the aircraft. All checklists were completed properly to include the terminating checklist which calls for release of parking brake. Supplemental information from acn 330622: apparent confusion on the hand signal for chocks in place may have contributed to this incident.

Original NASA ASRS Text

Title: FLC OF CL65 RELEASES BRAKE AFTER CHOCKS IN SIGNAL IS GIVEN. ACFT ROLLS BACK 4-6 FT.

Narrative: CL65 ACFT WAS PARKED AT GATE X, CYUL. ACFT WAS ONLY CHOCKED WITH ONE CHOCK IN FRONT OF NOSE GEAR. SIGNAL WAS GIVEN FOR CHOCKS IN AND I RELEASED THE PARKING BRAKE. APPROX 3-5 MINS LATER THE ACFT ROLLED BACK 4-6 FT STRIKING A BAGGAGE CART AND A BAG LOADER. DAMAGE WAS TO THE L WING INBOARD FLAP HINGE FAIRINGS AND STRIPPED PAINT ON THE TRAILING EDGE OF THE L WINGLET. THE ACFT WAS IMPROPERLY CHOCKED ALLOWING IT TO ROLL ON THE RAMP. CONFUSION ON THE APPARENT HAND SIGNALS FOR THE CHOCKING OF THE ACFT. ALL CHKLISTS WERE COMPLETED PROPERLY TO INCLUDE THE TERMINATING CHKLIST WHICH CALLS FOR RELEASE OF PARKING BRAKE. SUPPLEMENTAL INFO FROM ACN 330622: APPARENT CONFUSION ON THE HAND SIGNAL FOR CHOCKS IN PLACE MAY HAVE CONTRIBUTED TO THIS INCIDENT.

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.