WA WA - Floatplane crash into Puget Sound off Whidbey Island --9 passengers missing, 1 body recoverd in Mutiny Bay

The flight was destined for Renton WA. It's a fabulous place to live or visit for R&R with stunning views of Mt Rainier. Maybe one of the occupants owned property here.
^^rsbm

Actually, there are two popular seaplane landing/depart zones -- South Lake Washington which is located in Renton, WA - about 15 minutes from Seattle's Sea-Tac Airport, downtown Bellevue and downtown Seattle, and Lake Union located in downtown Seattle.

Destination Renton, WA is the South Lake Washington landing zone and where Northwest Seaplane company's terminal is located (not the lakefront property of a passenger).

South Lake Washington Seaplane dock, Renton, WA

 

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^^rsbm

Actually, there are two popular seaplane landing/depart zones -- South Lake Washington which is located in Renton, WA - about 15 minutes from Seattle's Sea-Tac Airport, downtown Bellevue and downtown Seattle, and Lake Union located in downtown Seattle.

Destination Renton, WA is the South Lake Washington landing zone and where Northwest Seaplane company's terminal is located (not the lakefront property of a passenger).

South Lake Washington Seaplane dock, Renton, WA


I am a bit confused and request clarification, please. TIA

I did not indicate anyone aboard may have owned lakefront property. I suppose that you know whether or not the floatplane occupants were planning to stay at a B&B or hotel in Renton or perhaps they were simply taking a guided tour of the area on the day of the tragedy or perhaps that the occupants were taking a seaplane to Renton but would travel into downtown Seattle from there?

Are you implying there are two lakes: Washington and South Washington or one that's divided by a bridge?

South Lake Washington Restoration Project
The shores of Lake Washington are a vital nursery for young salmon. However, most of the shoreline has been altered with piers and other overwater structures, bank armoring, and reduced native vegetation. At the south end of the lake the Washington State Department of Natural Resources (DNR) manages approximately three acres of filled shorelands. The property is located adjacent to the Renton Boeing plant South Lake Washington Restoration Project | WA - DNR

Screenshot 2022-09-07 8.15.02 AM.png
A view of the shoreline at Gene Coulon Park in Renton, Washington.
 
I am a bit confused and request clarification, please. TIA

I did not indicate anyone aboard may have owned lakefront property. I suppose that you know whether or not the floatplane occupants were planning to stay at a B&B or hotel in Renton or perhaps they were simply taking a guided tour of the area on the day of the tragedy or perhaps that the occupants were taking a seaplane to Renton but would travel into downtown Seattle from there?

Are you implying there are two lakes: Washington and South Washington or one that's divided by a bridge?



View attachment 364803
A view of the shoreline at Gene Coulon Park in Renton, Washington.

I'm sorry my post was not clear.

I was responding specifically to OP citing that the flight was destined for Renton WA, a fabulous place to live or visit and that maybe one of the passengers (occupants) owned property here.

If I misunderstood what I read as suggesting that perhaps one of the passengers owned property on the south shore -- making Renton the charter destination where the plane would land, then please, please, ignore my post.

And not implying there are two lakes, just adding clarity that one lake borders five very different cities, each located in King County.

Lake Washington is the largest lake in King County (and the second largest natural lake in Washington State). It borders the cities of Seattle on the west, Bellevue and Kirkland on the east, Renton on the south, and Kenmore on the north.

The passengers were all collected in Friday Harbor and were bound to Renton where they were expected to land in the waters of South Lake Washington in about 39 minutes. Reportedly, they were in the air for about 18 minutes when the plane disappeared from radar, and went down in Mutiny Bay (Whidbey Island, WA).

Clearly, I have no idea of the final destination of any of the ten passengers. I'm just shattered that they didn't reach wherever their final destination.
 
SEPT 7, 2022

The waters can be 100' to 300'. They do not have a dive team qualified to dive those depths.

Why it's a challenge to find the crashed floatplane


SEPT 8, 2022


SEPT 9, 2022

Body of floatplane crash victim identified as 29-year-old Gabby Hanna

The plane, flying from Friday Harbor to Renton Municipal Airport in a scheduled commercial commuter flight, crashed in Mutiny Bay on Sept. 4.

 
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Aviation Safety dot Net # 20220904-1

Flight Aware TrackLog:

.
 
Update 9/12/2022. NTSB has located the wreckage of the DHC-3 Turbine Otter that crashed off Whidbey Island, Washington on September 4. NTSB coordinated with the National Oceanic and Atmospheric Administration (NOAA) and the University of Washington’s Applied Physics Laboratory to use side scan sonar, multibeam sonar, and 3D instruments to locate the wreckage. The University of Washington’s vessel scanned the area identified from the NOAA multibeam data. Using all available data, investigators concluded the targets they identified were from the aircraft.

Due to the depth of the water (approximately 190 feet) and the current (3-5 knots), the most suitable tool for recovery is a work class remotely operated vehicle (ROV). NTSB continues to be in communication with federal agencies and local companies to obtain a work class ROV.
1663038566040.png
 
Interesting, one theory among pilot forums is structural failure, specifically with the elevator trim tab; apparently there have been other crashes from such a failure.

Cliff Mass, a professor at UW hosts a weather blog. He posted on the crash, noting a wind shift at 3:08 that might have played a part. The post gives more details.

Was this some kind of “perfect storm” incident? It may be quite a while until we know.

Another interesting fact, according to a local attorney:

Brodkowitz is focused on the structural integrity of the de Havilland DHC-3 Otter.

She said the 1963 plane’s history shows a conversion from a piston to a turbine engine,, which is commonly done to give the plane more speed and faster lift.

To compensate for a change in the center of gravity, the plane’s nose was extended.

“The structure of the airplane changes in the front, a firewall forward, not a lot of structural changes in the rest of it; and then you put this superfast engine in it and then there are problems,” Brodkowitz said.

Brodkowitz said engine conversions have led to structural fatigue and crashes in the past.

(Read the comments)
 
From MsMarple's link to KIRO 7 news in Post 31

WA - Floatplane crash into Puget Sound off Whidbey Island --9 passengers missing, 1 body recoverd in Mutiny Bay

"... the 1963 de Havilland DHC-3 Otter’s history shows a conversion from a piston to a turbine engine, which is commonly done to give the plane more speed and faster lift.
plane’s history shows a conversion from a piston to a turbine engine, which is commonly done to give the plane more speed and faster lift.

To compensate for a change in the center of gravity, the plane’s nose was extended."

-------- So very dreadful for those onboard the flight ----------

" done to give the plane more speed and faster lift "

I believe the error may possibly trace back to the mechanical engineers of this plane.
Many ME are pressured into developing methods for increasing speed but safety should always come first and foremost. MHOO But, wait. Maybe the weather had a major impact:

From the 2nd link regarding the weather conditions:

"Flying south they had the northerly winds behind them. Then they hit the convergence zone line. Moving from northerly to southerly winds could explain their rapid loss of speed. Although their ground speed would decline, their airspeed could increase, causing more lift. Did that contribute to their increasing elevation at the end?

Not only did the wind reverse suddenly, but there would have been considerable turbulence due to the strong vertical wind shear associated with the convergence/windshift line."


This float plane crashed carrying 10 people, including the pilot.

From de Havilland Canada DHC-3 Otter - Wikipedia

(There's an alarming Accident section.)

Screenshot 2022-09-14 11.29.50 AM.png
 

9/16/22

The NTSB released a preliminary report on Friday describing details of the flight and plane, but stopping short of naming any potential cause of the crash, in which a seasoned pilot and nine passengers were killed in a sudden, puzzling plummet into Puget Sound. The plane had undergone a 100-hour inspection — a routine examination done every 100 flight hours — just three days before the incident.

[..]

The NTSB announced Friday that it had secured the required work-class remote operated vehicles to begin recovering wreckage located over 150 feet below the surface last weekend. Those recovery efforts are set to begin on Sept. 26, more than three weeks after the crash.

[..]

In Friday’s report, based largely on witness reports due to a lack of physical evidence, the NTSB noted “substantial” impact to the plane took place after a “near-vertical” nose dive into Puget Sound, just off Whidbey Island.

In the report, 911 calls and interviews after the crash, witnesses described the airplane as spinning on the way down and one reported hearing engine noise without any “pitch change” during the descent.

The plane most recently received 100-hour inspections on Aug. 16 and Sept. 1. During the September inspection, a left-hand rudder retract cable was replaced. In August, the horizontal stabilizer hinge bolts, a right-hand engine igniter and a left-hand float locker latch were replaced, according to the report.

In both August and September, inspections were completed of the control column lower assembly and elevator control tab, as required by Federal Aviation Administration Airworthiness Directives. The t [article cut here]

5 pg NTSB report at the link.
 

...one [witness] reported hearing engine noise without any “pitch change” during the descent

[Cont from @Seattle1 link above]

Seaplane in Mutiny Bay crash was recently serviced, did not have flight recorder​

Sep. 16, 2022 at 2:23 pm Updated Sep. 16, 2022 at 8:28 pm

Hundreds of hours of inspections...

In August and September, inspections were completed of the control column lower assembly and elevator control tabs <>.

The FAA established an airworthiness directive for the elevator control tabs — small hinge mechanisms that contribute to the plane’s elevator system, which helps a pilot control the plane’s pitch, or the vertical movement of the nose — in 2004, after reports that the control rod to the elevator servo-tab system could detach from the elevator servo tab, causing the servo tab to “flutter” on DHC-3 Turbine Otter floatplanes with a turbine engine installed, like the one in the Mutiny Bay crash.

The fluttering servo tab has been linked to multiple DHC-3 crashes.

According to NTSB, the plane had a King 560 Enhanced Ground Proximity Warning System installed, which tracks limited parametric flight data, but was not “crash-protected.” It <> “nor was it required to be equipped” with a flight data recorder or cockpit voice recorder...
 
Wrap your heads around this one:

The Clallam County Sheriff’s Office suspects that human remains found washed ashore at Dungeness Spit are from a seaplane crash near Whidbey Island on Sept. 4.

Two people walking the beach on Friday found the female human torso on the seaward side of the spit, according to Sgt. John Keegan.

Officials suspect the body may be from a seaplane that crashed into the Strait of Juan de Fuca off Whidbey Island as it was en route to Island County, killing 10.
...
Deputies arrived at the Dungeness National Wildlife Refuge at about noon Friday, activated the Emergency Operations Center and contacted NTSB and FAA to see if the remains were possibly those of a victim of the crash, Keegan said.

The torso includes an intact hand, from which it may be possible to get fingerprints, he said. DNA from families of those who were killed in the seaplane crash might be obtained, once the names of the dead are released.
That's quite a journey but apparently there's a strong enough current to make it possible. Dungeness Spit is located in Sequim WA (Pronounced "Skwim). Ugh, if it is then at some point it floated past my town. Something really creepy about that.

 
Regarding the remains found on Dungeness Spit:

Deputy Coroner Supervisor Nathan Millett said Friday that fingerprints from the female torso are now with state authorities and will be run through the Automated Fingerprint Identification System (AFIS).

He expects results next week.
...
Officials suspect the body may be from a seaplane that crashed into the Strait of Juan de Fuca off Whidbey Island as it was en route to Island County on Sept. 4. Ten people were killed.

But there is no clear indication the remains belong to one of those who died in the plane crash, Detective Sgt. Eric Munger has said.

No foul play is suspected.

Thursday the effort to identify the dead woman was put on hold because of an officer-involved shooting in Sequim that morning.
 
The NTSB report file:///C:/Users/User/Downloads/Report_DCA22MA193_105855_10_1_2022%2012_41_50%20PM%20(1).pdf has some good information regarding the speed of the airplane before it went down (which contradicts some info reported by the media taken from flight tracking software which isn't always accurate). The airplane's last ground altitude/ speed, after a gradual slowing, was 700 feet/55 knots, which is pretty much the stall speed for the Beaver (there can be some variances due to flap configuration, weight, density altitude, etc, but it's close.) Outside of an extremely strong headwind that would impact groundspeed (different than indicated airspace) which I don't think there was that day, that means the airplane was near stall speed before it went down. DE HAVILLAND CANADA DHC-2 “BEAVER”.
When they talk "stall speed" it's not about the engine stalling, which some people believe but the WING no longer is developing lift and quits flying. The nose of the airplane will then drop abruptly and if you don't have a lot of altitude you may not have time to recover and the airplane may go into a "spin" (a spinning was noted by eyewitnesses). There are a number of reasons the plane might have been flying that slow, but that would just be conjecture at this point and best left to the accident investigators.
 

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