A320 flight crew has aircraft roll forward after stopping at gate to deplane.

Attributes
ACN	694832
Time
Date	200604
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : phx.airport
State Reference	AZ
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
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
Experience	flight time last 90 days : 180 flight time total : 11000 flight time type : 750
ASRS Report	694832
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	conflict : ground less severe non adherence : company policies non adherence : published procedure
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other
Supplementary
Problem Areas	Flight Crew Human Performance Airport Aircraft
Primary Problem	Flight Crew Human Performance

Narrative:

After a very long and tiring duty day (airplane swap and a long situation) and over 7 hours of flying we arrived in phx. Our gate was changed and even with my 10-8 and 10-9 charts out; it was difficult taxiing with the construction. As I maneuvered the aircraft toward the gate; the instructions from the marshaller were not the most precise instructions (confusion as to which lead-in line to use; unusual guidance signals; and a very abrupt signal to stop. I found out later he was new). In my opinion; the gate area was poorly lit. I stopped the aircraft at the gate when the marshaller signaled me; and thought I set the parking brake. I went about my postflt duties while waiting for the ground power to be plugged in. The first officer suddenly said; 'we're moving' as I also noticed the aircraft was rolling forward. I stepped on the toe brakes; reset parking brake and doublechked the yellow pressure gauge -- it operated normally. I talked to ground personnel who reported no injuries to anyone and no damage to act. I spoke to the customer service representative; to confirm that no one; and nothing was hurt or damaged. Since I truly thought I set the parking brake; I thought it was one of the 'airbus electronic glitches' that caused the aircraft to roll.

Original NASA ASRS Text

Title: A320 FLT CREW HAS ACFT ROLL FORWARD AFTER STOPPING AT GATE TO DEPLANE.

Narrative: AFTER A VERY LONG AND TIRING DUTY DAY (AIRPLANE SWAP AND A LONG SIT) AND OVER 7 HRS OF FLYING WE ARRIVED IN PHX. OUR GATE WAS CHANGED AND EVEN WITH MY 10-8 AND 10-9 CHARTS OUT; IT WAS DIFFICULT TAXIING WITH THE CONSTRUCTION. AS I MANEUVERED THE ACFT TOWARD THE GATE; THE INSTRUCTIONS FROM THE MARSHALLER WERE NOT THE MOST PRECISE INSTRUCTIONS (CONFUSION AS TO WHICH LEAD-IN LINE TO USE; UNUSUAL GUIDANCE SIGNALS; AND A VERY ABRUPT SIGNAL TO STOP. I FOUND OUT LATER HE WAS NEW). IN MY OPINION; THE GATE AREA WAS POORLY LIT. I STOPPED THE ACFT AT THE GATE WHEN THE MARSHALLER SIGNALED ME; AND THOUGHT I SET THE PARKING BRAKE. I WENT ABOUT MY POSTFLT DUTIES WHILE WAITING FOR THE GND PWR TO BE PLUGGED IN. THE FO SUDDENLY SAID; 'WE'RE MOVING' AS I ALSO NOTICED THE ACFT WAS ROLLING FORWARD. I STEPPED ON THE TOE BRAKES; RESET PARKING BRAKE AND DOUBLECHKED THE YELLOW PRESSURE GAUGE -- IT OPERATED NORMALLY. I TALKED TO GND PERSONNEL WHO RPTED NO INJURIES TO ANYONE AND NO DAMAGE TO ACT. I SPOKE TO THE CUSTOMER SVC REPRESENTATIVE; TO CONFIRM THAT NO ONE; AND NOTHING WAS HURT OR DAMAGED. SINCE I TRULY THOUGHT I SET THE PARKING BRAKE; I THOUGHT IT WAS ONE OF THE 'AIRBUS ELECTRONIC GLITCHES' THAT CAUSED THE ACFT TO ROLL.

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.