A B757 rolled backward shortly after arriving at the gate and after the captain had released the bra...

Attributes
ACN	331203
Time
Date	199603
Day	Tue
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : clt
State Reference	NC
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	B757 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Navigation In Use	Other Other
Flight Phase	ground : parked ground other : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp pilot : flight engineer
Experience	flight time last 90 days : 190 flight time total : 18755 flight time type : 530
ASRS Report	331203
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : atp
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	Other
Supplementary
Air Traffic Incident	other

Narrative:

Parked at gate in clt, called for parking and securing checklist, first item is parking brake. I released brakes, the aircraft started to roll back. First officer estimated roll back 6- 12 inches before I reset parking brake. I was quite sure I received chocks-in signal from signalman. There was no damage or contact as aircraft was still clear. The mechanic who was to chock the aircraft was not in place and didn't get the chocks in until after I reset the brakes. I usually leave the brakes set for a short while before releasing the brakes. Most of the time the chocks in place signal is both thumbs pointed in, arms and hands moved inward at head level. The correct signal is below the waist. The signalman gave the correct signal which is unusual. About the only thing that will prevent roll backs is to have head outside when releasing the brakes and watching very close (even when you are sure you have been given a chocks in signal). I didn't leave the brakes set for the wind because it was out of the west and we were on the east side of building out of the wind I thought, but it probably did affect the tail.

Original NASA ASRS Text

Title: A B757 ROLLED BACKWARD SHORTLY AFTER ARRIVING AT THE GATE AND AFTER THE CAPT HAD RELEASED THE BRAKES. THE CAPT RPTS THAT HE THOUGHT THAT HE HAD RECEIVED THE CORRECT CHOCKS- IN SIGNAL FROM THE MECH, BUT IN HINDSIGHT REALIZES THAT HE THOUGHT AT THE TIME THAT THIS WAS UNUSUAL. NO INJURIES OR DAMAGE RESULTED.

Narrative: PARKED AT GATE IN CLT, CALLED FOR PARKING AND SECURING CHKLIST, FIRST ITEM IS PARKING BRAKE. I RELEASED BRAKES, THE ACFT STARTED TO ROLL BACK. FO ESTIMATED ROLL BACK 6- 12 INCHES BEFORE I RESET PARKING BRAKE. I WAS QUITE SURE I RECEIVED CHOCKS-IN SIGNAL FROM SIGNALMAN. THERE WAS NO DAMAGE OR CONTACT AS ACFT WAS STILL CLR. THE MECH WHO WAS TO CHOCK THE ACFT WAS NOT IN PLACE AND DIDN'T GET THE CHOCKS IN UNTIL AFTER I RESET THE BRAKES. I USUALLY LEAVE THE BRAKES SET FOR A SHORT WHILE BEFORE RELEASING THE BRAKES. MOST OF THE TIME THE CHOCKS IN PLACE SIGNAL IS BOTH THUMBS POINTED IN, ARMS AND HANDS MOVED INWARD AT HEAD LEVEL. THE CORRECT SIGNAL IS BELOW THE WAIST. THE SIGNALMAN GAVE THE CORRECT SIGNAL WHICH IS UNUSUAL. ABOUT THE ONLY THING THAT WILL PREVENT ROLL BACKS IS TO HAVE HEAD OUTSIDE WHEN RELEASING THE BRAKES AND WATCHING VERY CLOSE (EVEN WHEN YOU ARE SURE YOU HAVE BEEN GIVEN A CHOCKS IN SIGNAL). I DIDN'T LEAVE THE BRAKES SET FOR THE WIND BECAUSE IT WAS OUT OF THE W AND WE WERE ON THE E SIDE OF BUILDING OUT OF THE WIND I THOUGHT, BUT IT PROBABLY DID AFFECT THE TAIL.

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.