An EMB145 after pushback and engine start; parking brake set and crew command to disconnect was give...

Attributes
ACN	678340
Time
Date	200511
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Phase	ground : pushback
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	flight crew : captain oversight : pic
ASRS Report	678340
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
ASRS Report	678339
Events
Anomaly	aircraft equipment problem : critical ground encounters : vehicle ground encounters other non adherence : company policies non adherence : far non adherence : published procedure
Independent Detector	other flight crewa other flight crewb other other : 3
Resolutory Action	aircraft : evacuated none taken : detected after the fact
Consequence	other other
Factors
Maintenance	contributing factor : schedule pressure
Supplementary
Problem Areas	Flight Crew Human Performance Company Environmental Factor Aircraft
Primary Problem	Company

Narrative:

Incident occurred on ground after pushback and parking brake set. Parking brake set and disconnect command given. Ground crew acknowledged receipt of disconnect command. A jolt was felt and aircraft nose settled to the ground; accompanied by aural landing gear warning and 1-G disagree EICAS message. Passenger were deplaned through normal cabin door. Disconnect command was given and received by ground crew and I do not know what transpired after that with what they were doing that caused the gear to collapse. It was fairly obvious that the nose had settled more than is normal. Callback conversation with reporter revealed the following information: the reporter stated the pushback had been completed and engines started. The ground crew was advised the parking brake was set and ok to disconnect command was given and received by the crew. The tug moved forward and the nose gear collapsed. The report given immediately after the incident was the tow bar was difficult to disconnect and the tug was going to move slightly to allow disconnect; but the tug driver's foot slipped off the brake and stepped on the accelerator; collapsing the nose gear. The communication between the ground crew and the cockpit was normal in all respects and was not a factor in this incident.

Original NASA ASRS Text

Title: AN EMB145 AFTER PUSHBACK AND ENG START; PARKING BRAKE SET AND CREW COMMAND TO DISCONNECT WAS GIVEN. THE TUG PULLED THE NOSE GEAR; COLLAPSING IT AND INCURRING DAMAGE TO THE NOSE GEAR AND TOW BAR.

Narrative: INCIDENT OCCURRED ON GND AFTER PUSHBACK AND PARKING BRAKE SET. PARKING BRAKE SET AND DISCONNECT COMMAND GIVEN. GND CREW ACKNOWLEDGED RECEIPT OF DISCONNECT COMMAND. A JOLT WAS FELT AND ACFT NOSE SETTLED TO THE GND; ACCOMPANIED BY AURAL LNDG GEAR WARNING AND 1-G DISAGREE EICAS MESSAGE. PAX WERE DEPLANED THROUGH NORMAL CABIN DOOR. DISCONNECT COMMAND WAS GIVEN AND RECEIVED BY GND CREW AND I DO NOT KNOW WHAT TRANSPIRED AFTER THAT WITH WHAT THEY WERE DOING THAT CAUSED THE GEAR TO COLLAPSE. IT WAS FAIRLY OBVIOUS THAT THE NOSE HAD SETTLED MORE THAN IS NORMAL. CALLBACK CONVERSATION WITH RPTR REVEALED THE FOLLOWING INFO: THE RPTR STATED THE PUSHBACK HAD BEEN COMPLETED AND ENGS STARTED. THE GND CREW WAS ADVISED THE PARKING BRAKE WAS SET AND OK TO DISCONNECT COMMAND WAS GIVEN AND RECEIVED BY THE CREW. THE TUG MOVED FORWARD AND THE NOSE GEAR COLLAPSED. THE RPT GIVEN IMMEDIATELY AFTER THE INCIDENT WAS THE TOW BAR WAS DIFFICULT TO DISCONNECT AND THE TUG WAS GOING TO MOVE SLIGHTLY TO ALLOW DISCONNECT; BUT THE TUG DRIVER'S FOOT SLIPPED OFF THE BRAKE AND STEPPED ON THE ACCELERATOR; COLLAPSING THE NOSE GEAR. THE COM BTWN THE GND CREW AND THE COCKPIT WAS NORMAL IN ALL RESPECTS AND WAS NOT A FACTOR IN THIS INCIDENT.

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.

An EMB145 after pushback and engine start; parking brake set and crew command to disconnect was given. The tug pulled the nose gear; collapsing it and incurring damage to the nose gear and tow bar.