An EMB145 on landing had a left main tire blow causing the aircraft to veer left and depart the runway. Caused by incorrect hydraulic brake line connections.

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Attributes
ACN	695594
Time
Date	200604
Local Time Of Day	0601 To 1200
Place
Locale Reference	airport : zzz.airport
State Reference	US
Altitude	agl single value : 0
Aircraft 1
Operator	common carrier : air carrier
Make Model Name	EMB ERJ 145 ER&LR
Operating Under FAR Part	Part 121
Flight Plan	IFR
Person 1
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : powerplant technician : airframe
ASRS Report	695594
Person 2
Affiliation	company : air carrier
Function	maintenance : technician
Qualification	technician : airframe technician : powerplant
ASRS Report	695595
Events
Anomaly	aircraft equipment problem : critical maintenance problem : improper documentation maintenance problem : improper maintenance non adherence : far non adherence : published procedure
Independent Detector	other other : 3
Resolutory Action	none taken : detected after the fact
Consequence	other
Factors
Maintenance	contributing factor : work cards contributing factor : manuals performance deficiency : testing performance deficiency : inspection performance deficiency : scheduled maintenance performance deficiency : logbook entry performance deficiency : installation performance deficiency : non compliance with legal requirements
Supplementary
Problem Areas	Maintenance Human Performance Chart Or Publication Aircraft
Primary Problem	Maintenance Human Performance

Narrative:

Aircraft below a tire on landing due possibly to maintenance action performed by myself. Crossed hydraulic lines were determined to have caused the aircraft to blow a tire due to locked brakes causing the plane to exit the runway. My part in the maintenance activity prior to the incident included signing for the installation of the wheel speed transducers and the brakes which were never removed for the initial task of gear removal. I verified the proper installation of these components on the l-hand gear and these components were determined to be properly installed. Due to the length of time between the incident and the actual maintenance and the number of legs flown without incident; it is possible that some form of undocumented maintenance could also be suspect. Due to the inconsistent nature of the braking failures it also seems that possibly some other factor including system defects may have also contributed.

Original NASA ASRS Text

Title: AN EMB145 ON LNDG HAD A L MAIN TIRE BLOW CAUSING THE ACFT TO VEER L AND DEPART THE RWY. CAUSED BY INCORRECT HYD BRAKE LINE CONNECTIONS.

Narrative: ACFT BELOW A TIRE ON LNDG DUE POSSIBLY TO MAINT ACTION PERFORMED BY MYSELF. CROSSED HYD LINES WERE DETERMINED TO HAVE CAUSED THE ACFT TO BLOW A TIRE DUE TO LOCKED BRAKES CAUSING THE PLANE TO EXIT THE RWY. MY PART IN THE MAINT ACTIVITY PRIOR TO THE INCIDENT INCLUDED SIGNING FOR THE INSTALLATION OF THE WHEEL SPD TRANSDUCERS AND THE BRAKES WHICH WERE NEVER REMOVED FOR THE INITIAL TASK OF GEAR REMOVAL. I VERIFIED THE PROPER INSTALLATION OF THESE COMPONENTS ON THE L-HAND GEAR AND THESE COMPONENTS WERE DETERMINED TO BE PROPERLY INSTALLED. DUE TO THE LENGTH OF TIME BTWN THE INCIDENT AND THE ACTUAL MAINT AND THE NUMBER OF LEGS FLOWN WITHOUT INCIDENT; IT IS POSSIBLE THAT SOME FORM OF UNDOCUMENTED MAINT COULD ALSO BE SUSPECT. DUE TO THE INCONSISTENT NATURE OF THE BRAKING FAILURES IT ALSO SEEMS THAT POSSIBLY SOME OTHER FACTOR INCLUDING SYS DEFECTS MAY HAVE ALSO CONTRIBUTED.

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.