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NTSB Report
March 18, 1983 · Fairchild Hiller FH-1100 · N26631
Longview, WA
Overview
Report Status
Preliminary report
Event Type
Accident
Date
March 18, 1983
Injury Outcomes
1 injury (1 serious injury)
Location
Longview, WA
Aircraft
Fairchild Hiller FH-1100
Tail Number
N26631
Injuries
Serious
Aircraft Damage
Destroyed
NTSB Number
SEA83FA065
SEVERAL PERSONS SAW THE HELICOPTER FLYING AT A CRUISING ALTITUDE OF ABOUT 200 TO 300 FT, THEN ENTER A LOOP TYPE OF MANEUVER. THEY LOST SIGHT OF THE HELICOPTER NEAR THE BOTTOM OF THE MANEUVER BEFORE IT CRASHED. THE PLT RECEIVED SERIOUS HEAD INJURIES & COULD NOT RECALL WHAT HAD HAPPENED. AN EXAM OF THE AIRFRAME REVEALED THAT THE TRANSMISSION & MAIN ROTOR HUB ASSY HAD REMAINED PARTIALLY ATTACHED TO THE AIRFRAME THRU THE LEFT & RIGHT LONGITUDINAL TRANSMISSION STRUTS. BOTH THE LEFT & RIGHT VERTICAL AS WELL AS BOTH LEFT & RIGHT LATERAL TRANSMISSION STRUTS HAD SEPARATED NEAR THEIR ATTACH POINTS. A METALLURGICAL EXAM OF THESE PARTS REVEALED THAT FITTING ASSEMBLY, PN 24-61022-6 HAD FAILED AT A FATIGUE CRACK. ADDITIONALLY, CORROSION WAS FOUND WITHIN THE LEFT VERTICAL & LATERAL (ADJUSTABLE) TRANSMISSION STRUTS. PREIMPACT CONTINUITY OF THE CYCLIC PITCH CONTROL WAS VERIFIED.
Full Narrative
SEVERAL PERSONS SAW THE HELICOPTER FLYING AT A CRUISING ALTITUDE OF ABOUT 200 TO 300 FT, THEN ENTER A LOOP TYPE OF MANEUVER. THEY LOST SIGHT OF THE HELICOPTER NEAR THE BOTTOM OF THE MANEUVER BEFORE IT CRASHED. THE PLT RECEIVED SERIOUS HEAD INJURIES & COULD NOT RECALL WHAT HAD HAPPENED. AN EXAM OF THE AIRFRAME REVEALED THAT THE TRANSMISSION & MAIN ROTOR HUB ASSY HAD REMAINED PARTIALLY ATTACHED TO THE AIRFRAME THRU THE LEFT & RIGHT LONGITUDINAL TRANSMISSION STRUTS. BOTH THE LEFT & RIGHT VERTICAL AS WELL AS BOTH LEFT & RIGHT LATERAL TRANSMISSION STRUTS HAD SEPARATED NEAR THEIR ATTACH POINTS. A METALLURGICAL EXAM OF THESE PARTS REVEALED THAT FITTING ASSEMBLY, PN 24-61022-6 HAD FAILED AT A FATIGUE CRACK. ADDITIONALLY, CORROSION WAS FOUND WITHIN THE LEFT VERTICAL & LATERAL (ADJUSTABLE) TRANSMISSION STRUTS. PREIMPACT CONTINUITY OF THE CYCLIC PITCH CONTROL WAS VERIFIED.
Flight
Event TypeAccident
Event Time15:10 PST
Nearest Airport0nm N
Runway0
Flight Plan FiledNone
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftFairchild Hiller FH-1100
Tail NumberN26631
Aircraft CategoryHeli
DamageDestroyed
Operating RulePart 91
Engines1
Engine TypeTurboshaft
Engine DetailsAllison · 250-C18B · Turboshaft · 317
Seats5
People & Injuries
Injury Summary1 injury (1 serious injury)
Fatal0
Serious1
Minor0
Uninjured0
Total1
Crew 1Age 69 · Second Class
Conditions
ConditionsVMC
LightDaylight
Wind350° @ 4 kt
Visibility55 sm
CeilingNone
Temperature / Dew Point63 F / 28 C
Altimeter29.00 inHg
Observation Time22:53
Weather SourceWFAC