SitNews - Stories in the News - Ketchikan, Alaska

NTSB Preliminary Report: Terrain Awareness and Warning System in Inhibit Mode at Time of Plane Crash


July 20, 2018
Friday PM

(SitNews) Ketchikan, Alaska - The National Transportation Safety Board has released a preliminary report on the single-engine, turbine-powered, float-equipped de Havilland DHC3T Otter airplane, N3952B, that sustained substantial damage during an impact at about 8:35 AM with rocky, mountainous and rising terrain about 9 miles west of Hydaburg and approximately 39 miles south southwest of Ketchikan. The airplane was registered to Blue Aircraft, LLC and operated by Taquan Air as a visual flight rules (VFR) on-demand commercial flight under the provisions of 14 Code of Federal Regulations Part 135 when the accident occurred on July 10, 2018.

Of the 11 occupants on board, the airline transport pilot was uninjured, four passengers sustained minor injuries, and six passengers sustained serious injuries. Marginal visual meteorological conditions prevailed, and company flight following procedures were in effect. The flight departed Steamboat Bay about 7:47 AM destined for Ketchikan, Alaska. 

jpg NTSB Preliminary Report: Terrain Awareness and Warning System in Inhibit Mode at Time of Plane Crash

A Coast Guard Air Station Sitka MH-60 Jayhawk helicopter aircrew locates the downed aircraft on Mount Jumbo on Prince of Wales Island, July 10, 2018. The Jayhawk aircrew hoisted all 11 people from the aircraft and took them to a pre-staging area where they were seen by local emergency medical personnel, and Temsco helicopter crews took the 11 survivors to Ketchikan, Alaska.
U.S. Coast Guard photo.

The area between Steamboat Bay and Ketchikan consists of remote inland fjords, coastal waterways, and steep mountainous terrain.

During an initial telephone interview with the National Transportation Safety Board (NTSB) investigator-in-charge (David B Banning) on July 11, the accident pilot (Mike Hudgins) reported that while in level cruise flight at about 1,100 feet mean sea level (MSL), and as the flight progressed into an area known as Sulzer Portage, visibility decreased rapidly from about 3-5 miles to nil. In an attempt to turnaround and return to VFR conditions, the pilot said he initiated a climbing right turn. Prior to completing the 180° right turn, he saw what he believed to be a body of water and he became momentarily disoriented, so he leveled the wings. Shortly thereafter, the pilot realized that the airplane was approaching an area of snow-covered mountainous terrain, so he applied full power and initiated a steep, emergency climb to avoid rising terrain ahead. According to the pilot's report to NTSB, as the steep emergency climb continued, the airspeed decayed, and the airplane subsequently collided with an area of rocky, rising terrain. During the initial impact, the airplane's floats were sheared off. The airplane wreckage came to rest in an area known as Jumbo Mountain, sustaining substantial damage to wings and fuselage, according to the NTSB Preliminary Report.

The pilot stated to the investigator-in-charge (David B Banning) that the Terrain Awareness and Warning System (TAWS) was in the inhibit mode at the time of the accident. 

According to the preliminary report, the passenger seated in the right front seat, reported after departure, they proceeded to Klawock and then made what he perceived to be as a 180° turn. He said there were numerous course deviations as they maneuvered around weather, and at times all forward visibility was lost as they briefly flew in and out of the clouds. He said he became uncomfortable and was thinking it would be prudent to just land on the water. Shortly thereafter, the passenger observed a large mountain loom directly in front of the airplane, knowing they could not out climb the mountain he presumed there must be a pass through the area. As they continued to approach the mountain they entered a cloud and he observed the pilot add power and pitch up, but the airplane impacted the side of the mountain. 

According to a second passenger seated towards the back of the airplane, the weather at Steamboat Bay when they departed was rain and low clouds. During the flight he could occasionally see the land and water below, but sometimes he could not. He said that there was consistent serious fog all around. After they passed Waterfall Resort he became very concerned that they were headed in the wrong direction. He texted the right front seat passenger (a friend) and asked him to ask the pilot to land and wait for the weather to improve. He said that he did not see the mountain until they were right on it, and observed the pilot add power right before impact. 

A Coast Guard Air Station Sitka MH-60 Jayhawk helicopter crew hoists 11 people from the crash site of a downed float plane on Mount Jumbo, on Prince of Wales Island, Alaska, Tuesda, July 10th. The Coast Guard, Ketchikan Volunteer Rescue Squad personnel and Alaska State Troopers coordinated the rescue of 11 people who survived a plane crash at 2,000 feet in elevation on the side of Mount Jumbo, 39 miles south southwest of Ketchikan, Alaska. U.S. Coast Guard video by Air Station Sitka.  Video 07/10/18
Courtesy USCG

At 08:43 AM , the United States Coast Guard (USCG) Sector Juneau received a report from the Alaska State Troopers (AST) that a float plane had crashed near Sulzer Portage on Prince of Wales Island. Two MH-60J Sea Hawk helicopters were launched from USCG Air Station Sitka, and the Alaska State Troopers activated the Ketchikan Volunteer Rescue Squad (KVRS) and other rescue personnel utilizing Temsco Helicopters, Inc. of Ketchikan.

According to the NTSB Preliminary Report, five helicopters were dispatched from Temsco to the search area and a staging area was established near the believed to be accident site. One of the helicopter pilots stated that he was unable to search the upper levels of the mountainous area due to a low cloud ceiling and poor visibility. After receiving word that the USCG was approaching the search area, he returned to the staging area.

A "First Alert" was received from the accident airplane's onboard emergency locator transmitter (ELT) at 09:11 AM. About the same time, 911 dispatch in Ketchikan talked to a survivor who provided GPS position and elevation based on data from her iPhone. At 10:47 AM both USCG helicopters arrived in the search area and one helicopter obtained a weak direction finding (DF) bearing from the ELT at the crash scene. The Directional Finding bearing, and the survivor's description of the accident area were used to direct search assets in close proximity to the accident site, so the survivors could hear the USCG helicopters. Two-way radio communications were established between the survivors and USCG by utilizing the accident airplane's radio.

The USCG located the accident site at 11:56 AM. At 1:08 PM all 11 survivors had been hoisted into the USCG's rescue helicopter and transferred to the staging area for transport back to Ketchikan by Temsco Helicopters. 

The accident site was located on a rock face on the east side of Jumbo Mountain at an elevation of about 2,557 feet msl (mean sea level). All the airplane major components were located at the accident site. 

The closest weather reporting facility was the Hydaburg Seaplane Base (PAHY), in Hydaburg, Alaska, about 9 miles west of the accident site. At 08:47 AM, an METAR• from PAHY (Hydaburg Seaplane Base) was reporting, in part: wind from 110° at 13 knots; visibility, 5 statute miles in light rain and mist; clouds and sky condition, few clouds at 900 ft, overcast clouds at 1,700 ft; temperature, 57° F; dew point 55° F; altimeter, 30.16 inches of mercury. (• A METAR weather report is predominantly used by pilots in fulfillment of a part of a pre-flight weather briefing, and by meteorologists, who use aggregated METAR information to assist in weather forecasting.)

A detailed wreckage examination is pending according to the preliminary report released on July 17, 2018. The wreckage has been transported to Ketchikan.

There were 6 serious injuries, 4 minor injuries, and 1 with no injury.

David B Banning is the investigator in charge. The NTSB did not travel to the scene of this accident.


Related News:

11 rescued from plane crash on POW 
SitNews - July 10, 2018


Editing by Mary Kauffman, SitNews


Source of News:


USCG - Alaska District 17


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