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UAF tower to help enable drones to fly in icing conditions

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UAF tower to help enable drones to fly in icing conditions


A new icing tower at the University of Alaska Fairbanks Geophysical Institute will help aerospace engineers figure out how to enable drones to fly safely in icy weather.

That’s important as Alaska accelerates an effort to use drones for deliveries to remote communities and for emergency response in harsh weather conditions. The Alaska Center for Unmanned Aircraft Systems Integration at the UAF Geophysical Institute is leading the work.

Ice build-up on wings or rotor surfaces alters airflow, degrading lift and affecting aircraft control. That’s a potentially catastrophic problem for drones and crewed aircraft traveling in clouds or ascending through them to cloud-free altitudes where icing doesn’t occur.

Drones operate at such low altitudes that they are regularly susceptible to icing.

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“If drones are going to be a robust option for cargo delivery, for search and rescue and for other uses, then they need to be reliable,” said Eyal Saiet, systems and technology integration specialist at ACUASI. “They have to be able to handle icing, and in Alaska that’s a major barrier to cross.”

Aircraft icing can occur at altitudes ranging from near the surface up to 40,000 feet, depending on conditions such as temperature, moisture and cloud type. The severest icing typically occurs between 2,000 and 20,000 feet, where supercooled liquid water droplets are most prevalent.

“An airplane flying 20,000 feet at 800 miles an hour or so has very little risk of icing as opposed to a drone flying very low and close to the ground,” Saiet said.

Federal Aviation Administration regulations categorize icing into large and small droplets. 

Large drops present more of a challenge,  as they interact differently on impact with cold surfaces than smaller drops do. Larger drops tend to shatter when hitting the aircraft, then reattach and freeze to surfaces outside of the ice protection area. 

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ACUASI’s ice tower is somewhat like a wind tunnel commonly used to test aircraft, except it’s smaller and vertical. The ACUASI tower is about 16 feet tall and located in a fenced area behind UAF’s Reichardt Building.

The tower can create various types of calibrated icing conditions, enabling drones to fly in a controlled environment that simulates real-world scenarios.

Coda Consulting of Ottawa, Canada, designed and built the tower, enhancing an experimental setup developed by David Orchard of the National Research Council of Canada. 

The new ACUASI icing tower can reproduce a wide range of icing scenarios, making it a critical asset for advancing drone safety and performance in harsh weather conditions.

“Our collaboration with NRC on spray nozzle calibration was key in ensuring that we could precisely control droplet size and liquid water content, allowing us to create accurate supercooled water droplet icing conditions for testing,” said Gislain Chevrette, an icing expert with Coda.

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Coda Consulting CEO Mathieu Gibeault called the new tower a “truly one-of-a-kind facility.”

“We saw an opportunity to take an innovative test facility design and enhance it by leveraging our years of expertise in icing test systems and automation,” he said.



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Alaska to replace Black Veterans Memorial Bridge, saving part as tribute to Alaska Highway builders – WTOP News

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Alaska to replace Black Veterans Memorial Bridge, saving part as tribute to Alaska Highway builders – WTOP News


ANCHORAGE, Alaska (AP) — Thousands of Black soldiers performed the backbreaking work of transforming rough-hewn wilderness in extreme weather swings…

ANCHORAGE, Alaska (AP) — Thousands of Black soldiers performed the backbreaking work of transforming rough-hewn wilderness in extreme weather swings during World War II to help build the first road link between Alaska and the Lower 48.

The work of the segregated Black soldiers is credited with bringing changes to military discrimination policies. The state of Alaska honored them by naming a bridge for them near the end point of the famed Alaska Highway.

Now, eight decades later, the aging bridge needs to be replaced. Instead of tearing it down, the state of Alaska intends to keep two of the bridge’s nine trestles in place as a refashioned memorial. The others will be given away.

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Two spans will become the memorial

The state of Alaska will replace the 1,885-foot (575-meter) bridge that spans the Gerstle River near Delta Junction, the end point of the Alaska Highway about 100 miles (161 kilometers) south of Fairbanks.

Seven of the bridge’s trestles are being offered for free to states, local governments or private entities who will maintain them for their historical features and public use.

The two remaining spans from the old bridge, renamed the Black Veterans Memorial Bridge in 1993, will honor the 4,000 or so Black soldiers who built the first wooden bridge over the river while completing the Alaska Highway.

These two sections, the first trestles on either end, will retain the name of the memorial bridge. The new Gerstle River Bridge will unofficially carry the memorial name unless the Legislature also makes it official. The old bridge will remain in place until the new one opens in 2031.

Former mayor wants proper memorial

Mary Leith, a former Delta Junction mayor and member of the historical society, said she’s pleased some of the history will be saved, but she wants the state to have proper signage and a highway pullout area near the historic bridge to allow people to walk on it.

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“I would hope that if they’re going to save it, then they save it properly,” she said.

The Black Veterans Memorial Bridge sign will remain and the two sections will be visible from the new bridge, but both will be blocked off to prevent people from climbing or vandalizing them, said Angelica Stabs, a spokesperson for the state transportation department. No pullout is planned.

The new bridge will parallel the existing bridge to the east, leaving about 50 feet of space between it and the old bridge’s location, Stab said.

Soldiers’ work helped integrate the U.S. Army

The project to build a supply route between Alaska and Canada used 11,000 troops from the U.S. Army Corps of Engineers divided by race, working under a backdrop of segregation and discrimination. Besides transforming the rugged terrain, the soldiers had to deal with mosquitoes, boggy land, permafrost and temperatures ranging from 90 degrees F (32 degrees C) to minus 70 F (minus 56 C).

“Though conditions were harsh for all, they were nearly unbearable for black soldiers. From the Deep South, most of these soldiers had never encountered anything approaching the severe conditions of the far north. Moreover, since black troops were not typically permitted to use heavy machinery, they made do with picks, shovels, and axes. In addition, they were prohibited from entering towns and were confined to wilderness assignments,” according to a historical account by the National Park Service.

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It took Black soldiers working from the north just over eight months to meet up with white soldiers coming from the south to connect the 1,500-mile (2,400-kilometer) gravel road, then called the Alcan Highway, from Dawson Creek, British Columbia, to Delta Junction Oct. 25, 1942.

“In light of their impressive performance, many of the black soldiers who worked on the Alcan were subsequently decorated and sometimes deployed in combat. Indeed, the U.S. Army eventually became the first government agency to integrate in 1948, a move that is largely credited in part to the laudable work of the soldiers who built the Alcan,” the National Park Service says.

Road expedited after Japanese attacks

Alaska was still a territory, and officials long wanted such a road to the Lower 48. However, battles over routes and its necessity led to delays.

Japanese attacks on Pearl Harbor in Hawaii and Dutch Harbor in Alaska, along with the Japanese invasions of the Alaska islands Kiska and Attu signaled urgency for the road since the ocean shipping lanes to the West Coast could be vulnerable.

Black soldiers working near Delta Junction built a temporary bridge over the Gerstle River in 1942. Contractors finished the steel structure two years later.

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Free bridge comes with caveats

The Alaska transportation department is accepting proposals until March 6 for the seven trestles, but you don’t have to take them all. The state will consider all proposals, even those seeking one or two trestles for uses such as a walkway over a creek in a public park.

Winners will have to abide by certain restrictions including not allowing vehicular traffic, paying for removal, transportation and lead abatement, and maintaining the features that make the bridge historically significant.

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© 2026 The Associated Press. All rights reserved. This material may not be published, broadcast, written or redistributed.



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Congressman Begich Secures Key Community Project Funding for Alaska Through FY26 Appropriations

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Congressman Begich Secures Key Community Project Funding for Alaska Through FY26 Appropriations


WASHINGTON, D.C. – Feb. 13, 2026 – Congressman Begich (R-AK) announced significant federal investments for communities across Alaska through Fiscal Year 2026 appropriations in the Transportation, Housing, and Urban Development (THUD) appropriations bill which includes critical Community Project Funding (CPF) investments and infrastructure funding.

“These investments reflect a clear commitment to invest in and modernize Alaska’s infrastructure,” said Congressman Begich. “The funding secured through FY2026 appropriations delivers real improvements that will enhance safety for our ports and harbors, support economic growth, and protect Alaska’s communities from storm damage.”

Transportation, Housing, and Urban Development (THUD) appropriations bill includes the following Community Project Funding investments across Alaska:

  • $250,000 – City of Homer – Homer Port Freight for the replacement of aging float systems essential for freight movement and port operations.
  • $5,000,000 – City of Kodiak for major upgrades to St. Hermans harbor infrastructure to support commercial fishing, maritime safety, and economic activity.
  • $1,750,000 – Municipality of Anchorage – Port of Alaska Modernization Program Electric Substation for the construction of a new electric substation to support ongoing modernization of the Port of Alaska, a critical lifeline for the state.
  • $2,000,000 – Petersburg Borough – Banana Point Breakwater Improvements to enhance harbor protection and reduce storm damage.
  • $2,387,000 – City of Soldotna – Marydale Avenue Improvements for transportation infrastructure improvements to enhance safety, accessibility, and local mobility.
  • $1,100,000 – City of Ouzinkie for modernization of harbor infrastructure to improve safety, reliability, and access for maritime users.

These funds represent real progress for Alaska communities and Congressman Begich remains committed to delivering results for Alaskans across the state

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Sen. Sullivan defends approach to Trump administration during address to Alaska Legislature

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Sen. Sullivan defends approach to Trump administration during address to Alaska Legislature


Alaska Republican U.S. Sen. Dan Sullivan delivers his annual address to the Legislature on Wednesday, Feb. 18, at the state Capitol in Juneau. (Mari Kanagy / ADN)

JUNEAU — U.S. Sen. Dan Sullivan defended his stance on the administration of President Donald Trump in response to questions from Alaska lawmakers after his annual address Wednesday, even as he called on them to unanimously adopt a resolution opposing one of Trump’s policy ideas.

“In terms of the president and his team, my North Star, in terms of my dealing with those guys, is what’s good for Alaska and what’s good for our country,” Sullivan said. “When they do things that I don’t like, there’s times that I will beat them up in public.”

Sullivan made the comment in response to a question from Anchorage Democratic state Sen. Forrest Dunbar, after a speech in which Sullivan, who is up for reelection this year, extolled Trump and declared Alaska was experiencing a “comeback” under his leadership.

“You said ‘yes’ to Trump many times,” Dunbar said. “I’m wondering if you’re willing to say ‘no.’”

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“You want to put out a tweet, smashing them on certain issues or criticizing them?” Sullivan asked in response. “Sometimes that works, but sometimes, if you want results, that’s not always the best way to get results.”

Sullivan listed federal funding freezes and worker layoffs as areas where he disagreed with Trump in recent months. He said his office “made huge impacts on all of those issues,” though he has often refrained from speaking publicly about those topics or responding to questions from reporters about them.

“I push back publicly and in private on all kinds of things — with always the North Star for me, how to be effective for all of you, for the people I represent and for my country,” said Sullivan.

Sullivan’s speech surveyed many familiar themes. He decried former President Joe Biden’s past environmental policies, which he said hindered resource development in Alaska; he celebrated Trump’s executive order seeking to expand the state’s resource industries; he promised progress on a long-sought natural gas pipeline; he praised a GOP-backed bill that extended tax cuts first enacted in 2017; he downplayed lawmakers’ concerns over cuts to Medicaid enacted to pay for those tax cuts; he criticized Senate Minority Leader Chuck Schumer, D-New York, for blocking legislative provisions that would have benefited Alaska; and he lauded a new rural health program that he said would direct more than $1 billion in new federal funding to the state.

Sullivan’s speech focused primarily on areas where he said he agrees with the president. But he called on the Legislature to pass a resolution opposing Trump’s move to charge $100,000 for visas that are used by educators coming to Alaska from other countries, primarily the Philippines, to fill vacant teaching positions in rural districts.

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Alaska has increasingly relied on teachers from other countries amid stagnant school funding and other concerns that have made attracting educators to the state from the Lower 48 increasingly difficult. Sullivan said he is working with other members of Alaska’s congressional delegation to seek an exemption to Trump’s visa surcharge.

Protesters gather outside the Alaska State Capitol in Juneau ahead of U.S. Sen. Dan Sullivan’s annual address to the state Legislature on Wednesday, Feb. 18. (Mari Kanagy / ADN)

Around three dozen protesters gathered outside the Capitol ahead of Sullivan’s address, speaking against several of his policy positions. Some lined the hallways as Sullivan entered the Alaska House chamber, holding signs reading, “We the People Do Not Consent.”

“When I entered the U.S. military, 60 years ago, I took an oath to protect and defend the U.S. Constitution,” Juneau resident Paul DeSloover said. “Sen. Sullivan, when he entered the Marines, took the same oath, and he likes to say ‘Semper Fi’ because he’s a Marine. But (it) should be, ‘Semper Timidus,’ because he is a timid coward.”

Erin Jackson-Hill, member of the left-leaning activist group Stand Up Alaska, criticized Sullivan’s support of the SAVE Act, a bill that would require proof of citizenship to vote. Alaska Republican U.S. Rep. Nick Begich also supports the legislation, whereas Alaska Republican U.S. Sen Lisa Murkowski opposes it.

“I call on Sen. Sullivan to show a modicum of the bravery shown by our other senator and stand up and say the SAVE Act is wrong. It will disenfranchise people,” Jackson-Hill said.

Sullivan said in a press availability after the speech that he believes “voting should be easy, and cheating should be hard.” He said he does not believe voter fraud is widespread in Alaska, but that it is elsewhere in the country.

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“I think having an ID requirement that makes sure that the people who are voting in our country are Americans is not unreasonable,” Sullivan said. “Even though it’s not a big issue here, it is a big issue in other parts of the country. And I’m a senator for Alaska, but I’m also a senator for America.”

Reviews both nationwide and in Alaska have found that voting by noncitizens is exceedingly rare.

In response to a question from a reporter, Sullivan criticized U.S. Immigration and Customs Enforcement operations in Minneapolis. He said he supports “deporting illegals with violent criminal records.”

“ICE needs to refine its techniques and tactics. It was horrendous, regardless of the situation, in my view, that two Americans were killed,” said Sullivan. “That should not have happened. I think there’s practices that they need to learn from. At the same time, I strongly support our law enforcement.”

The Daily News’ Iris Samuels reported from Anchorage and Mari Kanagy reported from Juneau.

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