A 320 flight crew reported the aircraft slid backwards and impacted a baggage cart while parked at t...

Attributes
ACN	575755
Time
Date	200303
Day	Tue
Local Time Of Day	0001 To 0600
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Weather Elements	Ice
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Navigation In Use	other
Flight Phase	ground : parked
Flight Plan	IFR
Aircraft 2
Make Model Name	Any Unknown or Unlisted Aircraft Manufacturer
Flight Phase	ground : taxi
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	575755
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	ground encounters : vehicle non adherence : company policies non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Aircraft
Primary Problem	Company

Narrative:

Aircraft that landed before us reported braking action poor, so we selected autobrakes medium. Taxi-in brake temperatures were rising past 500 degrees C, so I had first officer call ahead to let maintenance know we would need to chock aircraft and release the parking brake. Maintenance said they would pass the word. After parking, I tried to use hand signals to maintenance man to be sure we were chocked, but he did not understand. So, I opened the window and verbally asked if we were chocked, he said yes and walked away. I released the parking brake and checked that we were not moving. At about that same time, the external power light finally came on, but we had already started the APU, so I told the first officer to leave the APU pwring the aircraft. While our attention was on the power, the aircraft started sliding backward. We both saw the jetway move forward, and then realized we were moving. I stopped the aircraft with foot brakes and reset the parking brake. We had moved about 3 ft. The baggage loader was against the aircraft and punctured a hole in the side. I looked at the nosewheel and saw where the skid marks indicated that the chocks were slid those 3 ft.

Original NASA ASRS Text

Title: A 320 FLC RPTED THE ACFT SLID BACKWARDS AND IMPACTED A BAGGAGE CART WHILE PARKED AT THE GATE.

Narrative: ACFT THAT LANDED BEFORE US RPTED BRAKING ACTION POOR, SO WE SELECTED AUTOBRAKES MEDIUM. TAXI-IN BRAKE TEMPS WERE RISING PAST 500 DEGS C, SO I HAD FO CALL AHEAD TO LET MAINT KNOW WE WOULD NEED TO CHOCK ACFT AND RELEASE THE PARKING BRAKE. MAINT SAID THEY WOULD PASS THE WORD. AFTER PARKING, I TRIED TO USE HAND SIGNALS TO MAINT MAN TO BE SURE WE WERE CHOCKED, BUT HE DID NOT UNDERSTAND. SO, I OPENED THE WINDOW AND VERBALLY ASKED IF WE WERE CHOCKED, HE SAID YES AND WALKED AWAY. I RELEASED THE PARKING BRAKE AND CHKED THAT WE WERE NOT MOVING. AT ABOUT THAT SAME TIME, THE EXTERNAL PWR LIGHT FINALLY CAME ON, BUT WE HAD ALREADY STARTED THE APU, SO I TOLD THE FO TO LEAVE THE APU PWRING THE ACFT. WHILE OUR ATTN WAS ON THE PWR, THE ACFT STARTED SLIDING BACKWARD. WE BOTH SAW THE JETWAY MOVE FORWARD, AND THEN REALIZED WE WERE MOVING. I STOPPED THE ACFT WITH FOOT BRAKES AND RESET THE PARKING BRAKE. WE HAD MOVED ABOUT 3 FT. THE BAGGAGE LOADER WAS AGAINST THE ACFT AND PUNCTURED A HOLE IN THE SIDE. I LOOKED AT THE NOSEWHEEL AND SAW WHERE THE SKID MARKS INDICATED THAT THE CHOCKS WERE SLID THOSE 3 FT.

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.

A 320 flight crew reported the aircraft slid backwards and impacted a baggage cart while parked at the gate.