A320 captain reports parking brake failure at gate with one engine running.

Attributes
ACN	800818
Time
Date	200808
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	A320
Operating Under FAR Part	Part 121
Flight Phase	ground : parked
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
ASRS Report	800818
Events
Anomaly	aircraft equipment problem : critical conflict : ground less severe other anomaly
Independent Detector	other flight crewa
Resolutory Action	flight crew : regained aircraft control
Consequence	other
Supplementary
Problem Areas	Aircraft
Primary Problem	Aircraft

Narrative:

At gate with 1 engine running; parking brake set; good pressure on triple indicator; the aircraft started to move. Rudder pedal brake pressure was applied and maintained until aircraft chocked and both engines shut down. We started rolling toward terminal. Parking brake system failure. Callback conversation with reporter revealed the following information: the reporter confirmed that the ECAM message 'parking brake on' was displayed when the aircraft rolled. Maintenance action to remedy this fault is not known to the reporter.

Original NASA ASRS Text

Title: A320 CAPT REPORTS PARKING BRAKE FAILURE AT GATE WITH ONE ENGINE RUNNING.

Narrative: AT GATE WITH 1 ENG RUNNING; PARKING BRAKE SET; GOOD PRESSURE ON TRIPLE INDICATOR; THE ACFT STARTED TO MOVE. RUDDER PEDAL BRAKE PRESSURE WAS APPLIED AND MAINTAINED UNTIL ACFT CHOCKED AND BOTH ENGS SHUT DOWN. WE STARTED ROLLING TOWARD TERMINAL. PARKING BRAKE SYS FAILURE. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE REPORTER CONFIRMED THAT THE ECAM MESSAGE 'PARKING BRAKE ON' WAS DISPLAYED WHEN THE ACFT ROLLED. MAINTENANCE ACTION TO REMEDY THIS FAULT IS NOT KNOWN TO THE REPORTER.

Data retrieved from NASA's ASRS site as of May 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.