NTSB Identification: LAX95IA086.
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Scheduled 14 CFR operation of AMERICA WEST AIRLINES, INC.
Incident occurred Monday, January 23, 1995 in ALBUQUERQUE, NM
Probable Cause Approval Date: 06/29/1995
Aircraft: BOEING 737-300, registration: N155AW
Injuries: 37 Uninjured.
NTSB investigators used data provided by various sources and may not have traveled in support of this investigation to prepare this aircraft incident report.
THIS AIRCRAFT WAS INVOLVED IN FOUR MOMENTARY UNCOMMANDED ROLLS TO THE RIGHT DURING ROTATION. IN EACH INSTANCE, THE PILOT WAS ABLE TO QUICKLY CORRECT THE SITUATION AND CONTINUE THE FLIGHT WITHOUT FURTHER PROBLEMS. NUMEROUS ATTEMPTS BY MAINTENANCE PERSONNEL TO IDENTIFY THE PROBLEM AND TO RESOLVE THE ISSUE WERE UNSUCCESSFUL. AFTER THE FOURTH INCIDENT, THE LEFT MAIN LANDING GEAR STRUT WAS FOUND TO HAVE BEEN OVERSERVICED WITH NITROGEN. THIS ADDITIONAL PRESSURE TO THE STRUT WOULD SUDDENLY LIFT THE LEFT WING DURING ROTATION WHEN THE WEIGHT OF THE AIRCRAFT ON THE LANDING GEAR IS REDUCED, THUS GIVING THE PILOTS A ROLLING SENSATION TO THE RIGHT. THE STRUT WAS RESERVICED WITH OIL AND NITROGEN AND THE AIRCRAFT HAS BEEN RETURNED TO SERVICE WITH NO MORE OCCURRENCES. THE UPPER WING SURFACE PANEL SUPPORT ROD BROKE DUE TO HIGH-CYCLE FATIGUE AND WAS NOT CONSIDERED A FACTOR IN THESE INSTANCES.
The National Transportation Safety Board determines the probable cause(s) of this incident to be: maintenance personnel inadvertently overservicing the left main landing gear strut with nitrogen that, during rotation with the aircraft weight on the strut reduced, gave the pilots a rolling sensation to the right. Full narrative available
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