Md-80 taxied over obstruction while parking at gate; causing it to roll backwards.

Attributes
ACN	742738
Time
Date	200706
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : atl.airport
State Reference	GA
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	MD-80 Series (DC-9-80) Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	ground : taxi
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	742738
Events
Anomaly	ground encounters other non adherence : company policies
Independent Detector	other flight crewa
Resolutory Action	none taken : detected after the fact
Supplementary
Problem Areas	Company
Primary Problem	Company

Narrative:

I was approaching gate about 5 ft from stopping with single engine taxi at 1.1 EPR with good momentum. Suddenly the airplane stopped; bounced; and started rolling backwards. There were no obstacles inside the lines as I turned into the gate and there was no rut; upslope; or ridge on the ramp when I walked outside and looked. In my opinion the only thing that could do this is someone throwing a chock under my wheel while I was still moving. This created a very dangerous situation. People inside the airplane could have been hurt. People outside the airplane could have been hurt. The aircraft could have been damaged in a tail tip.

Original NASA ASRS Text

Title: MD-80 TAXIED OVER OBSTRUCTION WHILE PARKING AT GATE; CAUSING IT TO ROLL BACKWARDS.

Narrative: I WAS APCHING GATE ABOUT 5 FT FROM STOPPING WITH SINGLE ENG TAXI AT 1.1 EPR WITH GOOD MOMENTUM. SUDDENLY THE AIRPLANE STOPPED; BOUNCED; AND STARTED ROLLING BACKWARDS. THERE WERE NO OBSTACLES INSIDE THE LINES AS I TURNED INTO THE GATE AND THERE WAS NO RUT; UPSLOPE; OR RIDGE ON THE RAMP WHEN I WALKED OUTSIDE AND LOOKED. IN MY OPINION THE ONLY THING THAT COULD DO THIS IS SOMEONE THROWING A CHOCK UNDER MY WHEEL WHILE I WAS STILL MOVING. THIS CREATED A VERY DANGEROUS SITUATION. PEOPLE INSIDE THE AIRPLANE COULD HAVE BEEN HURT. PEOPLE OUTSIDE THE AIRPLANE COULD HAVE BEEN HURT. THE ACFT COULD HAVE BEEN DAMAGED IN A TAIL TIP.

Data retrieved from NASA's ASRS site as of January 2009 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.