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NTSB Report
September 18, 2015 · Helio H 395 Undesignat · N910SP
Bethel, AK
Overview
Report Status
Final with probable cause
Event Type
Accident
Date
September 18, 2015
Injury Outcomes
No injuries (4 uninjured)
Location
Bethel, AK
Aircraft
Helio H 395 Undesignat (1964)
Tail Number
N910SP
Operator
Renfro S Alaskan Adventures
Injuries
None
Aircraft Damage
Substantial
NTSB Number
GAA15CA268
The pilot of the float-equipped airplane stated that after takeoff from a lake, about 30-50 feet above the treetops, the airplane encountered a downdraft and descended uncontrolled into trees and terrain. The nearest weather reporting station was 7 NM to the north, and reported that the wind was 350 degrees true at 17 knots, with gusts to 23. The airplane sustained substantial damage to the wings and the elevator. The pilot reported that there were no mechanical failures or anomalies prior to or during the flight that would have prevented normal operation.
NTSB Probable Cause
The pilot's failure to maintain a positive climb rate during takeoff initial climb, resulting in an uncontrolled descent and collision with trees and terrain.
Full Narrative
The pilot of the float-equipped airplane stated that after takeoff from a lake, about 30-50 feet above the treetops, the airplane encountered a downdraft and descended uncontrolled into trees and terrain. The nearest weather reporting station was 7 NM to the north, and reported that the wind was 350 degrees true at 17 knots, with gusts to 23. The airplane sustained substantial damage to the wings and the elevator. The pilot reported that there were no mechanical failures or anomalies prior to or during the flight that would have prevented normal operation.
Flight
Event TypeAccident
Event Time15:40 AKDT
Nearest Airport0nm
RunwayNA
Runway Length2100 ft
Runway Width2100 ft
Flight Plan FiledCvfr
Flight Plan ActivatedYes
Aircraft FireNo
Aircraft ExplosionNo
Aircraft
AircraftHelio H 395 Undesignat
Tail NumberN910SP
Aircraft CategoryAir
DamageSubstantial
OperatorRenfro S Alaskan Adventures
Operating RulePart 135
Engines1
Engine TypeReciprocating
Engine DetailsLycoming · GO-480-G1D6 · Reciprocating · 295
Seats4
People & Injuries
Injury SummaryNo injuries (4 uninjured)
Fatal0
Serious0
Minor0
Uninjured4
Total4
Crew 1Age 31 · First Class · None
Crew 2None
Crew 3None
Crew 4None
Conditions
ConditionsVMC
LightDaylight
Wind350° @ 17 kt, gusting 23 kt
Visibility10 sm
CeilingOvercast 2900 ft
Temperature / Dew Point39 C / 28 C
Altimeter29.64 inHg
Observation Time23:56
Weather SourceWFAC