NTSB Identification: FTW83LA109.
The docket is stored on NTSB microfiche number 21832.
Accident occurred Friday, February 11, 1983 in HOUSTON, TX
Aircraft: SWEARINGEN SA-26T, registration: N111PT
Injuries: 1 Uninjured.

NTSB investigators may not have traveled in support of this investigation and used data provided by various sources to prepare this aircraft accident report.

THE PLT REPORTED THAT AFTER THE NOSEWHEEL TOUCHED DOWN, IT BEGAN A VIOLENT & UNCONTROLLABLE OSCILLATION, THEN LOCKED APRX 25 DEG TO THE LEFT. THE ACFT VEERED OFF THE LEFT SIDE OF THE RUNWAY, CROSSED AN AREA OF SOFT GROUND AND ANGLED ACROSS A TAXIWAY. AFTER CROSSING THE TAXIWAY, IT ENTERED ANOTHER AREA OF SOFT DIRT WHERE THE NOSE GEAR SEPARATED. AFTER COMING TO REST, THE PROPELLERS DUG HOLES IN THE SOFT GROUND BEFORE THE ENGINES WERE SHUT DOWN. AN INVESTIGATION REVEALED THE TIRES LEFT BLACK SCRUB MARKS (800 FT LONG) BEFORE THE ACFT DEPARTED THE RUNWAY. LOW AIR PRESSURE WAS FOUND IN THE NOSE GEAR STRUT AND SHIMMY DAMPER. ACCORDING TO A REPRESENTATIVE FROM THE MANUFACTURER, THIS LOW PRESSURE COULD CAUSE THE NOSE GEAR TO SHIMMY. PROPELLER STRIKE MARKS IN THE FIRST AREA OF SOFT GROUND INDICATED THE GROUND SPEED WAS 82 KTS WHERE THEY FIRST CONTACTED THE GROUND.

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,NOSE GEAR ASSEMBLY..VIBRATION

The National Transportation Safety Board determines the probable cause(s) of this accident to be:

LANDING GEAR,NOSE GEAR ASSEMBLY..JAMMED


Contributing Factors

PLANNED APPROACH..IMPROPER..PILOT IN COMMAND


Contributing Factors

TERRAIN CONDITION..SOFT


Contributing Factors

LANDING GEAR,NOSE GEAR..OVERLOAD


Contributing Factors

AIRSPEED..EXCESSIVE..PILOT IN COMMAND


Contributing Factors

LANDING GEAR,NOSE GEAR ASSEMBLY..PRESSURE TOO LOW


Contributing Factors

DIRECTIONAL CONTROL..NOT MAINTAINED..PILOT IN COMMAND


Contributing Factors

GROUND LOOP/SWERVE..UNCONTROLLED..PILOT IN COMMAND

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