ANC96LA111

NTSB accident investigation · McDonnell Douglas MD369D · Healy, AK · August 4, 1996

Accident · Minor injuriesLimited investigationFinal report
Date
August 4, 1996, 10:30 local (18:30 UTC)
Place
Healy, AK
Injuries
4 minor, 5 uninjured
Phase of flight
Enroute
Aircraft
N58269McDonnell Douglas MD369DN5246ECessna 185
Weather
Visual (VMC) · Day
Status
Completed · report May 23, 1997
Report
Approved by Office Director
NTSB office
Alaska Regional Office
Case key
2867

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

On this page

Probable cause

The inadequate visual outlook by the pilots of both aircraft, and their failure to see and avoid the other aircraft. A factor associated with the accident was sunglare affecting the helicopter pilot's vision.

The inadequate visual outlook by the pilots of both aircraft, and their failure to see and avoid the other aircraft. A factor associated with the accident was sunglare affecting the helicopter pilot's vision.

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.

Midair collisionCruise
Light condition - sunglareFactor
Visual lookout - inadequatePilot in commandCause
Visual lookout - inadequatePilot of other aircraftCause
Midair collisionCruise
Light condition - sunglareFactor
Visual lookout - inadequatePilot in commandCause
Visual lookout - inadequatePilot of other aircraftCause

Analysis

The McDonnell Douglas MD-369 helicopter, N58269, was flying in an easterly direction about 400 feet msl. The pilot said he was looking for potential landing sites which would allow the passengers/geologists to explore nearby rock formations. The pilot looked up and saw an airplane head-on an instant before impact. The helicopter's tailrotor drive shaft was severed in the impact, and the helicopter soon begin to spin. The pilot was able to make a partially controlled emergency landing in brushy terrain. The helicopter pilot said prior to impact with the airplane, his forward vision was partially restricted due to sun glare. The Cessna 185, N5246E, was flying in a westerly direction. The pilot said he saw the helicopter when it was slightly below, and directly in front of him. He said he just had a moment to pull back on the control wheel and try to turn left. He felt an impact, and later discovered the helicopter's tailrotor had damaged the airplane's lower fuselage, and knocked the tailwheel off. He was able to continue to his destination and made an uneventful landing.

The McDonnell Douglas MD-369 helicopter, N58269, was flying in an easterly direction about 400 feet msl. The pilot said he was looking for potential landing sites which would allow the passengers/geologists to explore nearby rock formations. The pilot looked up and saw an airplane head-on an instant before impact. The helicopter's tailrotor drive shaft was severed in the impact, and the helicopter soon begin to spin. The pilot was able to make a partially controlled emergency landing in brushy terrain. The helicopter pilot said prior to impact with the airplane, his forward vision was partially restricted due to sun glare. The Cessna 185, N5246E, was flying in a westerly direction. The pilot said he saw the helicopter when it was slightly below, and directly in front of him. He said he just had a moment to pull back on the control wheel and try to turn left. He felt an impact, and later discovered the helicopter's tailrotor had damaged the airplane's lower fuselage, and knocked the tailwheel off. He was able to continue to his destination and made an uneventful landing.

Factual narrative

See narrative for ANC96LA111A.

On August 4, 1996, about 103 Alaska daylight time, a McDonnel Douglas MD369D helicopter, N58269, operated by Tundra Copters, and a wheel equipped Cessna 185 airplane, N5246E, owned and operated by Talkeetna Air Taxi, collided in midair in the vicinity of the Vanert Glacier, located about 28 miles southeast of Healy, Alaska. The commercial certificated pilot and four passengers aboard the Cessna were not injured. The commercial certificated pilot of the helicopter and the three passengers aboard reported minor injuries. Both aircraft were being operated under 14 CFR Part 135 as on-demand air taxi flights in visual meteorological conditions. The helicopter was carrying three geologists employed by a mining company, and the airplane was carrying four Italian Nationalist tourists.

Telephone interviews between the NTSB investigator-in-charge and the pilots of the two aircraft on August 4 disclosed the following information. The helicopter pilot stated he was looking for a landing area to allow his passengers to do mining surveys. He said he was flying in an easterly direction, and the sun was partially in his eyes. He was flying the helicopter approximately 400 feet above the ground, looking down to find a landing site. When he looked up and forward through the cockpit bubble, he saw the Cessna's main landing gear head on and an estimated 20 feet away. He said he felt an impact, and then severe vibration. The vibration was so severe he was unable to read any of the instruments in the cockpit. He elected not to make any pitch or power changes because the helicopter was still flying, and he was concerned that any control inputs might further decay aircraft control. He allowed the helicopter to descend towards a sloped area, and when about 50 feet above the ground, he applied power to stop the descent. When the power was applied, the helicopter begin to spin quickly to the right. The pilot said although the tail rotor drive shaft had been severed, probably upon impact, he was able to maintain some lateral control and minimize lateral drift until the helicopter impacted slightly sloping, brush covered terrain. The pilot and three passengers were able to exit the helicopter on their own.

The airplane pilot said he was flying in a westerly direction, when he saw a helicopter "all of a sudden" and when it was very close. He thought the helicopter was about his altitude and nearly head on. He said he just had time to pull back and turn the control yoke to the left prior to hearing and feeling an impact somewhere in the tail section. He called for another airplane that was flying in the same general vicinity to come and look his airplane over. The pilot of the other airplane reported the accident airplane was missing a tailwheel. The pilot of the accident airplane elected to fly to his base of operations at Talkeetna, Alaska, where he landed without incident.

The Cessna airplane was examined after the accident by a Federal Aviation Administration (FAA) Inspector. He reported it appeared the tail rotor of the helicopter collided with bottom of the Cessna's fuselage in front of the tailwheel, and continued aft, striking and removing the tailwheel.

Aircraft · 2

Registration
N58269
Reported as
McDonnell Douglas MD369D
Category
Helicopter
Serial number
0421D
Airframe hours
4,310
Engine
Allison A250C20B, 420 horsepower, turbo shaft
Damage
No damage
Flight
Part 135
Operator
Tundra Copters, Inc.
Registered owner
P.B. Fasteners
Airworthiness certificate
Standard, Normal
Last inspection
100 hour · July 31, 1996 · 3 hours before
Departed
HRR
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.

Registration
N5246E
Reported as
Cessna 185
Category
Airplane
Serial number
18503943
Airframe hours
5,675
Engine
Continental IO-520, 300 horsepower, reciprocating
Damage
Substantial damage
Flight
Part 135
Registered owner
Talkeetna Air Taxi, Inc.
Airworthiness certificate
Standard, Normal; Standard, Utility
Last inspection
AAIP · July 26, 1996 · 103 hours before
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 · 2

As NTSB recorded them. NTSB leaves out names.

Role
Pilot, aircraft N58269
Age
51
Certificate
Commercial
Medical
Class 2, Valid Medical--w/ waivers/lim
Seat
Left
Flight hours
9,000 total · 1,500 in this make and model · 9,000 as pilot in command · 93 in the last 90 days · 46 in the last 30 days · 2 in the last 24 hours
Role
Pilot, aircraft N5246E
Age
29
Certificate
Commercial
Airplane ratings
Single-engine land, Multi-engine land, Single-engine sea
Instrument ratings
Airplane
Medical
Class 2, Valid Medical--no waivers/lim.
Seat
Left
Flight hours
3,400 total · 2,300 in this make and model · 3,400 as pilot in command · 275 in the last 90 days · 100 in the last 30 days · 3 in the last 24 hours

Weather

Conditions
Visual (VMC) · Day
Wind
Calm
Visibility
40 statute miles
Lowest ceiling
None
Temperature
50 °F

FAA reports on this event · 2

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