NTSB Identification: SEA89IA042.
The docket is stored on NTSB microfiche number 38808.
Scheduled 14 CFR
Incident occurred Monday, January 23, 1989 in SEATTLE, WA
Probable Cause Approval Date: 08/26/1992
Aircraft: FAIRCHILD SA-227-AC, registration: N386PH
Injuries: 14 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.

WHILE ON TAKEOFF ROLL, THE CPT TURNED THE ELECTRIC NOSE WHEEL STEERING OFF. THE FIRST OFFICER, FLYING THE ACFT, ANNOUNCED AN UNCOMMANDED RIGHT YAW. THE CPT TOOK THE CONTROLS BUT WAS NOT ABLE TO BRING THE ACFT TO A HALT BEFORE DEPARTING THE SIDE OF THE RUNWAY. POST MISHAP TESTS REVEALED A MALFUNCTION OF THE NOSE WHEEL STEERING DUE TO IMPROPER REPLACEMENT OF VALVES IN THE HYDRAULIC STEERING ACTUATOR UNIT.

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

INOPERATIVE NOSEWHEEL STEERING DUE TO IMPROPER MAINTENANCE. CONTRIBUTING TO THE INCIDENT WAS THE LACK OF ADEQUATE MAINTENANCE INFORMATION AVAILABLE IN THE AIRCRAFT MANUALS.

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