<< >> NASA ASRS Report 627447, August 2004

A B737-500 during pushbac the tug lost steering and brae control causing the airplane to swerve to the left. Incurred damage to the nose gear.

Attributes
ACN	627447
Time
Date	200408
Day	Mon
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : den.airport
State Reference	CO
Altitude	agl single value : 0
Environment
Flight Conditions	VMC
Light	Daylight
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	B737-500
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
Experience	flight time last 90 days : 230 flight time total : 14580 flight time type : 4650
ASRS Report	627447
Person 2
Affiliation	company : air carrier
Function	flight crew : first officer
Events
Anomaly	aircraft equipment problem : critical ground encounters : vehicle ground encounters other
Independent Detector	other flight crewa other flight crewb
Resolutory Action	none taken : detected after the fact
Consequence	other other other
Supplementary
Problem Areas	Environmental Factor
Primary Problem	Environmental Factor

Narrative:

During pushbac the tow tractor lost steering and braing control resulting in an uncontrollable moderate swerve to airplane left. The tow tractor driver advised me that control was lost and to apply aircraft braes. Braes were applied and the airplane and tractor came to a complete stop. The aircraft nose landing gear sustained damage due to torsion forces resulting from the forced separation and breaage of the towbar. Pushbac procedures were not a factor. WX was not a factor. Pushbac conduct/speed was not a factor. No injuries.

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Original NASA ASRS Text

Title: A B737-500 DURING PUSHBAC THE TUG LOST STEERING AND BRAE CTL CAUSING THE AIRPLANE TO SWERVE TO THE L. INCURRED DAMAGE TO THE NOSE GEAR.

Narrative: DURING PUSHBAC THE TOW TRACTOR LOST STEERING AND BRAING CTL RESULTING IN AN UNCONTROLLABLE MODERATE SWERVE TO AIRPLANE L. THE TOW TRACTOR DRIVER ADVISED ME THAT CTL WAS LOST AND TO APPLY ACFT BRAES. BRAES WERE APPLIED AND THE AIRPLANE AND TRACTOR CAME TO A COMPLETE STOP. THE ACFT NOSE LNDG GEAR SUSTAINED DAMAGE DUE TO TORSION FORCES RESULTING FROM THE FORCED SEPARATION AND BREAAGE OF THE TOWBAR. PUSHBAC PROCS WERE NOT A FACTOR. WX WAS NOT A FACTOR. PUSHBAC CONDUCT/SPD WAS NOT A FACTOR. NO INJURIES.

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.