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NTSB Report
September 4, 2022 · Dehavilland DHC-3 · N725TH
Freeland, WA
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
September 4, 2022
Injury Outcomes
10 injuries (10 fatalities)
Location
Freeland, WA
Aircraft
Dehavilland DHC-3 (1967)
Tail Number
N725TH
Operator
West Isle Air
Injuries
Fatal
Aircraft Damage
Destroyed
NTSB Number
DCA22MA193
HISTORY OF FLIGHTOn September 4, 2022, about 1509 Pacific daylight time, a float-equipped de Havilland DHC-3 (Otter), N725TH, was destroyed when it impacted the water in Mutiny Bay, near Freeland, Washington, and sank. The pilot and nine passengers were fatally injured. The airplane was owned by Northwest Seaplanes, Inc., and operated as a Title 14 Code of Federal Regulations (CFR) Part 135 scheduled passenger flight by West Isle Air dba Friday Harbor Seaplanes. The flight originated at Friday Harbor Seaplane Base (W33), Friday Harbor, Washington, with an intended destination of Will Rogers Wiley Post Memorial Seaplane Base (W36), Renton, Washington. Visual meteorological conditions prevailed at the time of the accident.
NTSB Probable Cause
The in-flight unthreading of the clamp nut from the horizontal stabilizer trim actuator barrel due to a missing lock ring, which resulted in the horizontal stabilizer moving to an extreme trailing-edge-down position rendering the airplane’s pitch uncontrollable.
Full Narrative
HISTORY OF FLIGHTOn September 4, 2022, about 1509 Pacific daylight time, a float-equipped de Havilland DHC-3 (Otter), N725TH, was destroyed when it impacted the water in Mutiny Bay, near Freeland, Washington, and sank. The pilot and nine passengers were fatally injured. The airplane was owned by Northwest Seaplanes, Inc., and operated as a Title 14 Code of Federal Regulations (CFR) Part 135 scheduled passenger flight by West Isle Air dba Friday Harbor Seaplanes. The flight originated at Friday Harbor Seaplane Base (W33), Friday Harbor, Washington, with an intended destination of Will Rogers Wiley Post Memorial Seaplane Base (W36), Renton, Washington. Visual meteorological conditions prevailed at the time of the accident.
Flight
Event TypeAccident
Event Time15:09 PDT
Nearest Airport0nm
Flight Plan FiledCvfr
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftDehavilland DHC-3
Tail NumberN725TH
Aircraft CategoryAir
DamageDestroyed
OperatorWest Isle Air
Operating RulePart 135
Engines1
Engine TypeTurboprop
Engine DetailsGeneral Electric · H80-200 · Turboprop · 777
Seats11
People & Injuries
Injury Summary10 injuries (10 fatalities)
Fatal10
Serious0
Minor0
Uninjured0
Total10
Crew 1Age 43 · Second Class · Fatal
Conditions
ConditionsVMC
LightDaylight
Wind310° @ 10 kt
Visibility10 sm
CeilingBroken clouds 9000 ft
Temperature / Dew Point68 F / 57 F
Altimeter30.02 inHg
Observation Time15:15
Weather SourceWFAC