A B737 was parked at a location the crew was not accustomed to and after parking rolled back because...

Attributes
ACN	1158574
Time
Date	201403
Local Time Of Day	0001-0600
Place
Locale Reference	ZZZ.Airport
State Reference	US
Aircraft 1
Make Model Name	B737 Undifferentiated or Other Model
Operating Under FAR Part	Part 121
Flight Phase	Other Park post-arrival
Flight Plan	IFR
Person 1
Function	Pilot Flying Captain
Qualification	Flight Crew Air Transport Pilot (ATP)
Experience	Flight Crew Last 90 Days 480 Flight Crew Type 6000
Person 2
Function	Pilot Not Flying First Officer
Experience	Flight Crew Last 90 Days 180 Flight Crew Total 14600 Flight Crew Type 5000
Events
Anomaly	Deviation - Procedural Published Material / Policy Flight Deck / Cabin / Aircraft Event Illness Inflight Event / Encounter Loss Of Aircraft Control

Narrative:

Follow me truck guided aircraft to a different ramp location than the one normally used perhaps because of heavy rain. I stopped aircraft and released the parking brake after I received the overhead chocks in hand signal. Completed the parking check and from the corner of my eye noticed the ground marshaller waving his arms and jumping. It took a second or two and I noticed the aircraft rolling backwards. I applied the brakes and the aircraft stopped. No passengers were affected however; the forward flight attendants reported that flight attendant in the aft galley had hurt his knee due to the unexpected sudden stop. I asked him if he required any assistance and he declined. We were told by the ground handling personnel that the ramp is uneven in the area that we were parked in. The flights continued with an outbound delay due to customer service issues with a different pilot crew and same in-flight crew.

Original NASA ASRS Text

Title: A B737 was parked at a location the crew was not accustomed to and after parking rolled back because of an uneven ramp. When the brakes were finally set to stop the aircraft an after flight attendant suffered a knee injury.

Narrative: Follow Me Truck guided aircraft to a different ramp location than the one normally used perhaps because of heavy rain. I stopped aircraft and released the parking brake after I received the overhead chocks in hand signal. Completed the parking check and from the corner of my eye noticed the ground Marshaller waving his arms and jumping. It took a second or two and I noticed the aircraft rolling backwards. I applied the brakes and the aircraft stopped. No passengers were affected however; the forward flight attendants reported that flight attendant in the aft galley had hurt his knee due to the unexpected sudden stop. I asked him if he required any assistance and he declined. We were told by the ground handling personnel that the ramp is uneven in the area that we were parked in. The flights continued with an outbound delay due to customer service issues with a different pilot crew and same in-flight crew.

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.