ANC92FA116

NTSB accident investigation · De Havilland DHC-2 Mark 1 · Dillingham, AK · July 30, 1992

Accident · FatalField investigationFinal report
Date
July 30, 1992, 11:00 local (19:00 UTC)
Place
Dillingham, AK
Injuries
6 fatal, 1 serious
Damage
Destroyed
Phase of flight
Maneuvering
Aircraft
N67151De Havilland DHC-2 Mark 1
Weather
Visual (VMC) · Day
Status
Completed · report December 16, 1993
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Safety recommendations
Yes
FAA report
19920730028209A
Case key
5646

From the NTSB’s public API. By law, NTSB reports can’t be used as evidence in lawsuits over the accident.

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Probable cause

The pilot's delayed decision in reversing course and his failure to maintain airspeed during the maneuver. Factors related to the accident were: mountainous terrain and a low ceiling.

Sequence of events

NTSB’s coding before 2008: each occurrence and phase of flight, and the causes and factors under it. The codes are defined in NTSB’s coding manual.

Loss of control - in flightManeuvering - turn to reverse direction
Terrain condition - mountainous/hillyFactor
Weather condition - low ceilingFactor
In-flight planning/decision - delayedPilot in commandCause
Physical impairment(hypoglycemia/diet)Pilot in command
Airspeed - not maintainedPilot in commandCause
Stall - inadvertentPilot in command
In flight collision with terrain/waterManeuvering - turn to reverse direction

Analysis

The destination camp is located about 50 mi sw of the departure lodge, and is separated by mountains with some peaks over 4,000 ft asl. The general area weather included low ceilings. The operator stated that shortly before the accident he observed the youth creek weather 'better than 400 feet...', and told the pilot that it appeared good enough to make the flight. The pilot stated that as he flew up youth creek he could see that the pass was closed by low clouds and attempted to reverse direction. The pilot stated he 'made a hard steep turn, and the airplane stalled...' The pilot said the weather was about 800 ft ceiling and visibility of 1 mi. When the pilot was admitted into the hospital immediately following the accident, he was diagnosed as having an insulin dependent diabetic condition. His medical records contain no evidence of, and the pilot denied any knowledge of, any pre-accident diabetic condition.

Aircraft

Registration
N67151
Reported as
De Havilland DHC-2 Mark 1 (DHC-2 MARK)
Category
Airplane
Serial number
900
Airframe hours
7,892
Engine
P&W R-985-AN14B, 450 horsepower, reciprocating
Damage
Destroyed
Fire
On-Ground
Flight
Business · Part 91
Operator
Ronald R. Mcmillian, doing business as Bristol Bay Lodge
Registered owner
Ronald R. Mcmillian
Airworthiness certificate
Standard, Normal
Last inspection
Annual · September 1, 1991 · 125 hours before
Departed
Bristol Bay Ldg, AK
Destination
Togiak River Cp, AK
Flight plan
Company VFR

Matched to the registry by N-number and the event date; the registry’s history has gaps, so older matches can be wrong. Compare the reported make and model.

Flight crew

As NTSB recorded them. NTSB leaves out names.

Role
Pilot
Age
42
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
8,842 total · 550 in this make and model · 120 in the last 90 days · 80 in the last 30 days · 2 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
90° at 4 knots
Visibility
1 statute miles
Lowest ceiling
800 ft overcast
Temperature
50 °F

FAA reports on this event · 1

The FAA’s own accident and incident reports, matched to the aircraft by N-number and date.