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NTSB Report
January 23, 1989 · Fairchild SA-227-AC · N386PH
Seattle, WA
Overview
Report Status
Probable Cause
Event Type
Incident
Date
January 23, 1989
Injury Outcomes
No injuries (14 uninjured)
Location
Seattle, WA
Aircraft
Fairchild SA-227-AC
Tail Number
N386PH
Operator
Horizon Air
Injuries
None
Aircraft Damage
Minor
NTSB Number
SEA89IA042
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.
NTSB Probable Cause
INOPERATIVE NOSEWHEEL STEERING DUE TO IMPROPER MAINTENANCE. CONTRIBUTING TO THE INCIDENT WAS THE LACK OF ADEQUATE MAINTENANCE INFORMATION AVAILABLE IN THE AIRCRAFT MANUALS.
Full Narrative
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.
Flight
Event TypeIncident
Event Time13:44 PST
Nearest AirportSEATAC (0nm N)
Runway16
Runway Length11900 ft
Runway Width150 ft
Flight Plan FiledIFR
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftFairchild SA-227-AC
Tail NumberN386PH
Aircraft CategoryAir
DamageMinor
OperatorHorizon Air
Operating RulePart 135
Engines2
Engine TypeTurboprop
Engine DetailsGarrett · TPE-331 · Turboprop · 1000 | Garrett · TPE-331 · Turboprop · 1000
Seats20
People & Injuries
Injury SummaryNo injuries (14 uninjured)
Fatal0
Serious0
Minor0
Uninjured14
Total14
Crew 1Age 32 · First Class
Conditions
ConditionsVMC
LightDaylight
Wind160° @ 7 kt
Visibility15 sm
CeilingNone
Temperature / Dew Point37 C / 30 C
Altimeter30.00 inHg
Observation Time21:51
Weather SourceWFAC