CE560 first officer; while in the cabin briefing the passengers; hears the captain yell 'brakes' fro...

Narrative:

The passengers were onboard and seated. I was in the process of checking identification's and briefing the weather. The cabin door was open when the PIC called to me from outside the aircraft. His words were '[my name;] brakes.' thinking he wanted me to check that the brakes were set; I stopped the briefing and went forward to check the parking brake handle. The brakes were not set; so I climbed into the left seat to set them. As I did this; I noticed the aircraft moving forward. I applied brakes in positive manner and the aircraft stopped. I explained to the passengers the reason for the action. I don't remember anything they may have said; and I went on with the safety briefing. Set the brakes as early in the preflight stage of the flight as possible. Insure the brakes are set prior to removing the chocks. Insure one pilot is in the cockpit prior to pulling the chocks.

Original NASA ASRS Text

Title: CE560 First Officer; while in the cabin briefing the passengers; hears the Captain yell 'brakes' from outside the aircraft. Moving to the cockpit; the aircraft is noted to be moving and the parking brake is set.

Narrative: The passengers were onboard and seated. I was in the process of checking ID's and briefing the weather. The cabin door was open when the PIC called to me from outside the aircraft. His words were '[my name;] brakes.' Thinking he wanted me to check that the brakes were set; I stopped the briefing and went forward to check the parking brake handle. The brakes were not set; so I climbed into the left seat to set them. As I did this; I noticed the aircraft moving forward. I applied brakes in positive manner and the aircraft stopped. I explained to the passengers the reason for the action. I don't remember anything they may have said; and I went on with the safety briefing. Set the brakes as early in the preflight stage of the flight as possible. Insure the brakes are set prior to removing the chocks. Insure one pilot is in the cockpit prior to pulling the chocks.

Data retrieved from NASA's ASRS site 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	1172178
Time
Date	201405
Local Time Of Day	1201-1800
Place
Locale Reference	ZZZ.Airport
State Reference	US
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Make Model Name	Citation Excel (C560XL)
Operating Under FAR Part	Part 125
Flight Phase	Parked
Component
Aircraft Component	Parking Brake
Person 1
Function	First Officer Pilot Flying
Qualification	Flight Crew Air Transport Pilot (ATP)
Events
Anomaly	Deviation - Procedural Published Material / Policy Ground Event / Encounter Other / Unknown

CE560 first officer; while in the cabin briefing the passengers; hears the captain yell 'brakes' from outside the aircraft. Moving to the cockpit; the aircraft is noted to be moving and the parking brake is set.