B777-200 captain became aware the aircraft had rolled after the parking brake was set.

Attributes
ACN	540456
Time
Date	200203
Day	Sat
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mdw.tower
Operator	common carrier : air carrier
Make Model Name	B777 Undifferentiated or Other Model
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
ASRS Report	540456
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : less severe non adherence : company policies non adherence : far non adherence : published procedure
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact other
Consequence	other
Supplementary
Problem Areas	Company Flight Crew Human Performance Maintenance Human Performance Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

After completion of parking checklist, I was out of my captain's seat putting on my coat and gathering my suitcase when I felt the aircraft move slightly -- as if the caterers had bumped the aircraft. Shortly, I heard a loud click and looked down to see that the parking brake had released itself. By the time that I was in the seat trying to figure out what had happened, maintenance came on and said that the aircraft had rolled backwards and had to be doublechocked. Their theory was that the cargo had been removed causing the parking brake to kick off. This didn't sound right to me, so I called the chief pilot when I came home and asked his opinion. He also felt it was an odd occurrence and that I should submit a report to let the flight department know that this had happened and maybe there might be a problem with the parking brake assembly and should be monitored on this particular aircraft. I wanted to write the occurrence in the aircraft logbook, but maintenance said that they were aware of the problem and that they were in a hurry to get the airplane ready for an out of country flight. I wish now that I had gone ahead and written it up so that the next captain would be aware of the problem in case it should happen to him or future capts on this ship.

Original NASA ASRS Text

Title: B777-200 CAPT BECAME AWARE THE ACFT HAD ROLLED AFTER THE PARKING BRAKE WAS SET.

Narrative: AFTER COMPLETION OF PARKING CHKLIST, I WAS OUT OF MY CAPT'S SEAT PUTTING ON MY COAT AND GATHERING MY SUITCASE WHEN I FELT THE ACFT MOVE SLIGHTLY -- AS IF THE CATERERS HAD BUMPED THE ACFT. SHORTLY, I HEARD A LOUD CLICK AND LOOKED DOWN TO SEE THAT THE PARKING BRAKE HAD RELEASED ITSELF. BY THE TIME THAT I WAS IN THE SEAT TRYING TO FIGURE OUT WHAT HAD HAPPENED, MAINT CAME ON AND SAID THAT THE ACFT HAD ROLLED BACKWARDS AND HAD TO BE DOUBLECHOCKED. THEIR THEORY WAS THAT THE CARGO HAD BEEN REMOVED CAUSING THE PARKING BRAKE TO KICK OFF. THIS DIDN'T SOUND RIGHT TO ME, SO I CALLED THE CHIEF PLT WHEN I CAME HOME AND ASKED HIS OPINION. HE ALSO FELT IT WAS AN ODD OCCURRENCE AND THAT I SHOULD SUBMIT A RPT TO LET THE FLT DEPT KNOW THAT THIS HAD HAPPENED AND MAYBE THERE MIGHT BE A PROB WITH THE PARKING BRAKE ASSEMBLY AND SHOULD BE MONITORED ON THIS PARTICULAR ACFT. I WANTED TO WRITE THE OCCURRENCE IN THE ACFT LOGBOOK, BUT MAINT SAID THAT THEY WERE AWARE OF THE PROB AND THAT THEY WERE IN A HURRY TO GET THE AIRPLANE READY FOR AN OUT OF COUNTRY FLT. I WISH NOW THAT I HAD GONE AHEAD AND WRITTEN IT UP SO THAT THE NEXT CAPT WOULD BE AWARE OF THE PROB IN CASE IT SHOULD HAPPEN TO HIM OR FUTURE CAPTS ON THIS SHIP.

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.