B737 flight crew has aircraft roll forward during pushback and contacts pushback tug at koa.

Attributes
ACN	695415
Time
Date	200604
Local Time Of Day	1801 To 2400
Place
Locale Reference	airport : koa.airport
State Reference	HI
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Night
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-200
Operating Under FAR Part	Part 121
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : first officer
Qualification	pilot : commercial
Experience	flight time last 90 days : 150 flight time total : 6000 flight time type : 2200
ASRS Report	695415
Person 2
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
Qualification	pilot : atp
Experience	flight time last 90 days : 180 flight time total : 13000 flight time type : 8000
ASRS Report	695414
Events
Anomaly	ground encounters : vehicle non adherence : company policies
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : anomaly accepted
Supplementary
Problem Areas	Flight Crew Human Performance Company Aircraft Maintenance Human Performance
Primary Problem	Maintenance Human Performance

Narrative:

We pushed back with an experienced crew. We stopped; paused; then pulled forward. This action was repeated several times. We called to the pushback crew to see if everything was ok. They responded that the were having trouble disconnecting the tow bar. There was a pause. In my peripheral view I saw some movement; and when I looked down I noticed the parking brake was not set; nor do I recall the pushback crew ever asking for the brakes to be set. Just then the ground crew called 'brakes.' we heard some movement from the forward galley. We received a call from the flight attendants in the back and we called the forward galley. In the meantime; the ground crew was trying to talk to us on the interphone. It took some time to communicate what had happened. The ground crew told us everything was ok and just drove away. Upon landing at destination; we contacted maintenance and inspected the aircraft. Supplemental information from acn 695414: started both engines during the push back. Some distance from the gate the aircraft was rocked back and forth by the tug in an attempt to disconnect the tow bar. As soon as the tow bar was disconnected the aircraft rolled forward; hitting the tug with the nose cone. The ground crew then asked us to set the parking brake. Ground crew assured us everything was ok.

Original NASA ASRS Text

Title: B737 FLT CREW HAS ACFT ROLL FORWARD DURING PUSHBACK AND CONTACTS PUSHBACK TUG AT KOA.

Narrative: WE PUSHED BACK WITH AN EXPERIENCED CREW. WE STOPPED; PAUSED; THEN PULLED FORWARD. THIS ACTION WAS REPEATED SEVERAL TIMES. WE CALLED TO THE PUSHBACK CREW TO SEE IF EVERYTHING WAS OK. THEY RESPONDED THAT THE WERE HAVING TROUBLE DISCONNECTING THE TOW BAR. THERE WAS A PAUSE. IN MY PERIPHERAL VIEW I SAW SOME MOVEMENT; AND WHEN I LOOKED DOWN I NOTICED THE PARKING BRAKE WAS NOT SET; NOR DO I RECALL THE PUSHBACK CREW EVER ASKING FOR THE BRAKES TO BE SET. JUST THEN THE GND CREW CALLED 'BRAKES.' WE HEARD SOME MOVEMENT FROM THE FORWARD GALLEY. WE RECEIVED A CALL FROM THE FLT ATTENDANTS IN THE BACK AND WE CALLED THE FORWARD GALLEY. IN THE MEANTIME; THE GND CREW WAS TRYING TO TALK TO US ON THE INTERPHONE. IT TOOK SOME TIME TO COMMUNICATE WHAT HAD HAPPENED. THE GND CREW TOLD US EVERYTHING WAS OK AND JUST DROVE AWAY. UPON LNDG AT DEST; WE CONTACTED MAINT AND INSPECTED THE ACFT. SUPPLEMENTAL INFO FROM ACN 695414: STARTED BOTH ENGS DURING THE PUSH BACK. SOME DISTANCE FROM THE GATE THE ACFT WAS ROCKED BACK AND FORTH BY THE TUG IN AN ATTEMPT TO DISCONNECT THE TOW BAR. AS SOON AS THE TOW BAR WAS DISCONNECTED THE ACFT ROLLED FORWARD; HITTING THE TUG WITH THE NOSE CONE. THE GND CREW THEN ASKED US TO SET THE PARKING BRAKE. GND CREW ASSURED US EVERYTHING WAS OK.

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.