The Ketchikan crash on August 6, 2010 remains a pivotal moment for air safety in Southeast Alaska. This accident involving a DeHavilland DHC-3 Otter changed procedures for water landing responses and reshaped how operators manage risk in mountainous coastal terrain.
Below is a detailed breakdown of the event, its context, and the lasting impact on regional aviation policy and operations.
| Date | Aircraft | Route | Occupants | Outcome |
|---|---|---|---|---|
| August 6, 2010 | DeHavilland DHC-3 Otter | Ketchikan to Metlakatla | 9 (2 crew, 7 passengers) | 2 fatalities, 7 injured |
| Impact location | Mountainous island region | Terrain | Weather | Daylight VFR |
| Initial climb | Engine power loss | Pilot response | Terrain strike | Survivors extracted |
Flight Path and Climb Performance
Departure Procedures
The aircraft departed Ketchikan Harbor Seaplane Base bound for Metlakatla Seaplane Base. During initial climb, witnesses reported the Otter seemed to struggle gaining altitude over the ridge line.
Terrain and Elevation Challenges
Rising terrain near Humphrey Island and adjacent islands created a dense visual environment with limited maneuvering room. The climb gradient required to clear ridgelines was likely underestimated given the aircraft performance and weight conditions.
Engine Failure and Pilot Response
Power Loss Event
During the climb, the single engine lost power, possibly due to fuel mixture issues or carburetor icing in damp conditions. The pilot declared an emergency and initiated a turn back toward the water.
Forced Landing Decision
With insufficient height to return to the departure strip, the crew aimed for a narrow strip of shoreline. The forced landing on uneven terrain resulted in a violent impact that caused severe structural damage and separated the fuselage.
Search and Rescue Coordination
Alert and Mobilization
Local authorities and the U.S. Coast Guard were notified immediately. Air and sea units converged on the crash site despite challenging nearshore conditions and limited visibility in places due to sea spray and mist.
Medical Response and Evacuation
Survivors with critical injuries were stabilized at the scene and then transported by helicopter to regional medical centers. Two occupants succumbed to trauma at the site, highlighting the severity of the terrain impact.
Investigation Findings and Safety Recommendations
Probable Cause Analysis
The National Transportation Safety Board identified a partial loss of engine power during climb as the main factor. Contributing elements included the pilot’s delayed decision to divert to water and the inadequate terrain clearance margin in the chosen flight path.
Regulatory Changes
Following the incident, regulators encouraged operators in Southeast Alaska to adopt stricter altitude margin rules and enhanced terrain awareness training. Operators now commonly require simulated water landing drills and more detailed route risk assessments.
Key Takeaways and Recommendations
- Always calculate a conservative climb gradient that accounts for terrain clearance and aircraft performance margins.
- Conduct pre-flight risk assessments that include alternative landing sites such as water or flat terrain.
- Practice water landing procedures regularly to maintain crew proficiency and confidence during emergencies.
- Use real-time weather updates and avoid marginal VFR conditions in complex coastal topography.
- Coordinate closely with air traffic services and rescue organizations to minimize response delays.
FAQ
Reader questions
What happened during the Ketchikan crash on August 6, 2010?
A DeHavilland DHC-3 Otter lost engine power during initial climb, struck mountainous terrain near Humphrey Island, and broke apart, resulting in two fatalities and seven injuries.
How many people were on board and what were the injuries?
There were 9 occupants; 2 passengers died at the scene and 7 others sustained various injuries, with several requiring medical evacuation.
What terrain and weather factors contributed to the accident? The aircraft attempted to clear rising island terrain on a daylight visual flight rules plan, but the climb gradient was insufficient to clear ridgelines, compounded by a dense nearshore environment. What changes were made to regional aviation safety procedures after the crash?
Regulators and operators implemented stricter minimum altitude rules over mountainous water, more comprehensive route risk analysis, and mandatory water landing simulation training for pilots.