DC9 flight crew at sbn allowed their aircraft to roll forward while parked at gate.

Attributes
ACN	428992
Time
Date	199902
Day	Sun
Local Time Of Day	1201 To 1800
Place
Locale Reference	airport : sbn.airport
State Reference	IN
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Controlling Facilities	tower : mmcu.tower
Operator	common carrier : air carrier
Make Model Name	DC-9 30
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 150 flight time total : 14000 flight time type : 6000
ASRS Report	428992
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : instrument pilot : multi engine pilot : commercial
Events
Anomaly	non adherence : published procedure other anomaly other
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Supplementary
Problem Areas	Flight Crew Human Performance
Primary Problem	Flight Crew Human Performance
Air Traffic Incident	Pilot Deviation

Narrative:

After parking at gate at sbn with engines shut down and seat belt sign off, I received the chocks in signal from marshaller and released the parking brake. Shortly thereafter, the aircraft began rolling forward. I reapplied the brakes quickly causing an abrupt stop. After an explanatory PA to the passenger, I watched them deplane and did not note any injuries or complaints. As far as I know, no one fell down. The aircraft did not strike any ground equipment or sustain any damage. The chocks were placed behind the wheels allowing forward motion. I failed to note on airport advisory page that brakes must remain on at all times due to slope. I reacted to chocks signal instead of leaving brakes set.

Original NASA ASRS Text

Title: DC9 FLC AT SBN ALLOWED THEIR ACFT TO ROLL FORWARD WHILE PARKED AT GATE.

Narrative: AFTER PARKING AT GATE AT SBN WITH ENGS SHUT DOWN AND SEAT BELT SIGN OFF, I RECEIVED THE CHOCKS IN SIGNAL FROM MARSHALLER AND RELEASED THE PARKING BRAKE. SHORTLY THEREAFTER, THE ACFT BEGAN ROLLING FORWARD. I REAPPLIED THE BRAKES QUICKLY CAUSING AN ABRUPT STOP. AFTER AN EXPLANATORY PA TO THE PAX, I WATCHED THEM DEPLANE AND DID NOT NOTE ANY INJURIES OR COMPLAINTS. AS FAR AS I KNOW, NO ONE FELL DOWN. THE ACFT DID NOT STRIKE ANY GND EQUIP OR SUSTAIN ANY DAMAGE. THE CHOCKS WERE PLACED BEHIND THE WHEELS ALLOWING FORWARD MOTION. I FAILED TO NOTE ON ARPT ADVISORY PAGE THAT BRAKES MUST REMAIN ON AT ALL TIMES DUE TO SLOPE. I REACTED TO CHOCKS SIGNAL INSTEAD OF LEAVING BRAKES SET.

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.