A BE1900 captain experienced inadvertent aircraft movement after engine start with the parking brake...

Narrative:

We were performing a gpu start for the #2 engine using the appropriate checklist. The parking brake was set and I had my feet on the brakes but we had no chocks installed. After I gave the remove gpu signal to the ground crew the aircraft started moving inadvertently forward. It took a fair amount of break pressure to get the aircraft stopped. The event took me somewhat by surprise; as I did not expect the aircraft to start moving at that point; especially given the strong headwind and only one engine running. I'm not sure if the cold temperatures were a factor. Nobody was hurt and no equipment was damaged but for the safety of ground agents such events must be avoided.1. Personally; in the future; I will always make sure that chocks are installed for a gpu start even if it's just for a run-up without passengers. 2. Ground agents; for their own safety; should make sure that chocks are installed for gpu starts. 3. Company should use manuals/bulletins to alert crews of the dangers of starting engines without chocks installed.

Original NASA ASRS Text

Title: A BE1900 Captain experienced inadvertent aircraft movement after engine start with the parking brake set. No chocks were installed but the Captains feet were on the brakes and a fair amount of pressure was required to stop the aircraft.

Narrative: We were performing a GPU start for the #2 engine using the appropriate checklist. The parking brake was set and I had my feet on the brakes but we had no chocks installed. After I gave the remove GPU signal to the ground crew the aircraft started moving inadvertently forward. It took a fair amount of break pressure to get the aircraft stopped. The event took me somewhat by surprise; as I did not expect the aircraft to start moving at that point; especially given the strong headwind and only one engine running. I'm not sure if the cold temperatures were a factor. Nobody was hurt and no equipment was damaged but for the safety of ground agents such events must be avoided.1. Personally; in the future; I will always make sure that chocks are installed for a GPU start even if it's just for a run-up without passengers. 2. Ground agents; for their own safety; should make sure that chocks are installed for GPU starts. 3. Company should use manuals/bulletins to alert crews of the dangers of starting engines without chocks installed.

Data retrieved from NASA's ASRS site as of April 2012 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.

Attributes
ACN	925839
Time
Date	201012
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Make Model Name	Beech 1900
Operating Under FAR Part	Part 135
Flight Phase	Parked
Component
Aircraft Component	Brake System
Person 1
Function	Captain Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

A BE1900 captain experienced inadvertent aircraft movement after engine start with the parking brake set. No chocks were installed but the captains feet were on the brakes and a fair amount of pressure was required to stop the aircraft.