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Making the Brazilian ATR-72 Spin
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Note: This story was corrected on August 10th at 10:23 am, thanks to the help of a sharp-eyed reader.
Making an ATR-72 Spin
I wasn’t in Brazil on Friday afternoon, but I saw the post on Twitter or X (or whatever you call it) showing a Brazil ATR-72, Voepass Airlines flight 2283, rotating in a spin as it plunged to the ground near Sao Paulo from its 17,000-foot cruising altitude. All 61 people aboard perished in the ensuing crash and fire. A timeline from FlightRadar 24 indicates that the fall only lasted about a minute, so the aircraft was clearly out of control. Industry research shows Loss of Control in Flight (LOCI) continues to be responsible for more fatalities worldwide than any other kind of aircraft accident.
The big question is why the crew lost control of this airplane. The ADS-B data from FlightRadar 24 does offer a couple of possible clues. The ATR’s speed declined during the descent rather than increased, which means the aircraft’s wing was probably stalled. The ATR’s airfoil had exceeded its critical angle of attack and lacked sufficient lift to remain airborne. Add to this the rotation observed, and the only answer is a spin.
Can a Large Airplane Spin?
The simple answer is yes. If you induce rotation to almost any aircraft while the wing is stalled, it can spin, even an aircraft as large as the ATR-72. By the way, the largest of the ATR models, the 600, weighs nearly 51,000 pounds.
Of course, investigators will ask why the ATR’s wing was stalled. It could have been related to a failed engine or ice on the wings or tailplane. (more…)
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How the FAA Let Remote Tower Technology Slip Right Through Its Fingers
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In June 2023, the FAA published a 167-page document outlining the agency’s desire to replace dozens of 40-year-old airport control towers with new environmentally friendly brick-and-mortar structures. These towers are, of course, where hundreds of air traffic controllers ply their trade … ensuring the aircraft within their local airspace are safely separated from each other during landing and takeoff.
The FAA’s report was part of President Biden’s Infrastructure Investment and Jobs Act enacted on November 15, 2021. That bill set aside a whopping $25 billion spread across five years to cover the cost of replacing those aging towers. The agency said it considered a number of alternatives about how to spend that $5 billion each year, rather than on brick and mortar buildings.
One alternative addressed only briefly before rejecting it was a relatively new concept called a Remote Tower, originally created by Saab in Europe in partnership with the Virginia-based VSATSLab Inc. The European technology giant has been successfully running Remote Towers in place of the traditional buildings in Europe for almost 10 years. One of Saab’s more well-known Remote Tower sites is at London City Airport. London also plans to create a virtual backup ATC facility at London Heathrow, the busiest airport in Europe.
A remote tower and its associated technology replace the traditional 60-70 foot glass domed control tower building you might see at your local airport, but it doesn’t eliminate any human air traffic controllers or their roles in keeping aircraft separated.
Inside a Remote Tower Operation
In place of a normal control tower building, the airport erects a small steel tower or even an 8-inch diameter pole perhaps 20-40 feet high, similar to a radio or cell phone tower. Dozens of high-definition cameras are attached to the new Remote Tower’s structure, each aimed at an arrival or departure path, as well as various ramps around the airport.
Using HD cameras, controllers can zoom in on any given point within the camera’s range, say an aircraft on final approach. The only way to accomplish that in a control tower today is if the controller picks up a pair of binoculars. The HD cameras also offer infrared capabilities to allow for better-than-human visuals, especially during bad weather or at night.
The next step in constructing a remote tower is locating the control room where the video feeds will terminate. Instead of the round glass room perched atop a standard control tower, imagine a semi-circular room located at ground level. Inside that room, the walls are lined with 14, 55-inch high-definition video screens hung next to each other with the wider portion of the screen running top to bottom.
After connecting the video feeds, the compression technology manages to consolidate 360 degrees of viewing area into a 220-degree spread across the video screens. That creates essentially the same view of the entire airport that a controller would normally see out the windows of the tower cab without the need to move their head more than 220 degrees. Another Remote Tower benefit is that each aircraft within visual range can be tagged with that aircraft’s tail number, just as it might if the controller were looking at a radar screen. (more…)
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Dauntless Dedication to Air Zoo Aircraft Reincarnation
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Air Zoo Aerospace & Science Experience CEO Troy Thrash said the Douglas SBD-3 Dauntless on display in the World War II exhibit was the team’s first Lake Michigan restoration project. The eight-year effort took place years ago in a building in a restricted area of the airport, “so no one had access to see it being restored.” Since then, all of the Air Zoo’s restoration work has been on display in the Flight Discovery Center.
The Center “is the Air Zoo’s original building that opened in 1979,” said Thrash. On weekends, an electric shuttle conveys visitors from the Flight Innovation Center, and the Discovery Center’s observation lounge is a popular place for watching airplanes come and go from the Kalamazoo/Battle Creek International Airport.
In the foyer is the battle-damaged cowl of a Michigan Air National Guard A-10 Warthog whose Middle East wounds reveal the honeycomb structure that protects the powerplant it streamlines. Farther on, visitors can try on an F-16 and F-102 cockpit procedure trainers for size. But the restoration shop occupies much of the facilities space where volunteers tend to their restoration contribution, usually within earshot and arm’s reach of Air Zoo visitors.
When the Air Zoo resumed its restoration work with it’s FM-2 Wildcat proposal, inviting school kids and others to work side-by-side with the volunteers was part of the plan. “We want to make this a real community project. The Navy may say this won’t fly, but we need to create this experience.” Since then, “busloads of high school kids have come through and worked on the airplanes,” said Deputy Restoration Manager Dan Brant. “Mostly they do disassembly, Scotchbrite metal to get it ready for paint, anything they can do easily with little chance of damaging anything. Not damaging an original part is the primary concern.”
Not long after the Air Zoo started work on the FM-2 Wildcat, retired Rear Admiral Samuel Cox visited. He is the director of the Naval History and Heritage Command and “Curator of the Navy,” responsible for the Navy’s museums, its collections of art and artifacts (like the FM-2), and the research library and its 150 million pages of information. “He wanted to see our model, especially how we involved kids and the community,” Thrash said. “It was really cool because he felt others restoring Navy assets need to do the same thing. And, he said, “Oh, by the way, do you want another airplane?’ That’s when the Dauntless SBD-2P came.”
The last of its kind, Douglas Aircraft built only 14 photo-reconnaissance Dauntless SBD-2Ps. It joined the fleet in 1941, flying with Scouting Squadron (VS) 6 aboard the USS Enterprise (CV-6). After repairing landing accident damage, it joined the aircraft pool at Pearl Harbor shortly after its Day of Infamy. It went on to fight in the Battle of the Coral Sea with Bombing Squadron (VB) 5.
When it was replaced by a newer model, the Dauntless -2P went to NAS Glenview, where it was a training mount for new aviators undergoing carrier qualification in Lake Michigan. The training carriers, converted paddle-wheelers, the USS Wolverine and USS Sable tied up every night at Chicago’s Navy Pier.
After nine months of accident-free flying, on February 18, 1944, the SBD’s engine lost power on final approach to the Wolverine. Lieutenant (junior grade) John Lendo survived his lake landing, but the Dautless didn’t. Lieutenant Lendo died 10 months later during a combat mission over the Philippines. A and T Recovery recovered the -2P from Lake Michigan on June 19, 2009, and it arrived at the Air Zoo restoration center in July 2016.
Several weeks after the airplane arrived, Thrash received a call from Dr. Arthur Lendo. “The last name rang a bell because Lieutenant John Lendo was the last person to fly this airplane. Dr. Lendo was his nephew, and he’s been very (personally and financially) supportive of our work, and he and his family were here when the airplane was all together.”
“Neither my brother or I ever had the privilege of knowing my Uncle John,” said Art Lendo, who now lives in Tennessee. “Like so many Americans of my baby-boomer generation, I was named after family members who served so heroically in World War Two.”
Arthur Lendo said his father never spoke of his uncle’s death because it was too painful. “My being able to sit in the cockpit of the Dauntless Bomber that Lieutenant John Lendo crash-landed into Lake Michigan was an amazing experience for me,” said Kevin Lendo. “He was the war hero uncle I never got to meet.”
The Air Zoo’s restores airplanes to historic standards, right down to matching the paint, a process made easier in 2016 with the installation of a $90,000 dedicated paint booth. It creates the perfect dust free environment for applying and curing the coatings, usually a three-part enamel. The hard part is recreating the nonspecular colors the Navy used in its various camouflage paint schemes, Ward said.
Running his fingers lightly across the velvet-like wing skin of the SBD-2P, Ward explained that “nonspecular” is the technical term for something that does not reflect light. At this point in World War II, the Dauntless wore nonspecular blue over nonspecular gray. Several modern manufacturers translated the colors’ Military Specification into modern recipes for today’s paint systems.
“The manufacturer told us to add a certain amount of flattener to the paint, but it was still too shiny,” Ward said. “So, I called the company, said I’d painted the whole thing, and it’s too shiny. Well, they said, that’s all the flattener you can add. So, I cut out a bunch of aluminum panels, primed them, and then painted them, adding another ounce of flattener for each one.”
From the manufacturer, 16 ounces of paint is a 50/50 mixture of paint and flattener, with the painter adding 2 ounces of hardener to the mixture before application. To get the right nonspecular reflectivity of the blue and gray Ward’s test panels called for another 6 ounces of flattener. “On the first SBD we did this wasn’t a problem because a different manufacturer made the paint, but it went out of business, so we switched to a new vendor. We ignored the rules, ignored the manufacturer, to get the sheen we wanted.”
The Air Zoo’s restoration team are the first people to get hands-on with the airplanes after their last flights. Unfolding their mysteries is part of the work that infuses the tangible with the spirit of the people who gave them life.
When it came out of Lake Michigan, they at first couldn’t explain why the SBD-2P’s left wing had zero corrosion and the right one was totally corroded. Also, Ward said, the right-wing tank was lined with self-sealing rubber and the left one was just aluminum. It turns out that the corroded wing with the self-sealing fuel tank was for an A-24, the Army’s SBD.
“When the -2P back to San Diego for repairs,” Ward said, “They pulled a new right wing out of stock, and it was an Army wing.” Unlike Navy wings that lived in a corrosive maritime environment, “none of the aluminum in the it was anodized.” The aircraft’s records say that carburetor ice killed the engine on its last approach. “When we got into the cockpit after they pulled it out of the lake, we found the carb heat knob wasn’t pulled out,” which applies the heat.
The Air Zoo’s first Dauntless restoration, the SBD-3 on display in the World War II exhibit area, lost power right after it took off from the carrier and ended up in the lake, Ward said. The plane guard rescued the pilot and the accident investigation suspected that fuel starvation was the cause. “When the airplane rolled into the Air Zoo 50 years later, I looked in the cockpit, and the fuel selector was on the empty tank. We didn’t know it was empty until we went to drain the fuel out of it, and there wasn’t any. The other tank had 45 gallons of fuel in it.”
Unlike their other restoration efforts, the team faced a hard deadline on the SBD-2P if the airplane was to be center stage in Hawaii on December 7, 2021. They made it. With the restoration complete, the Air Zoo completed its reincarnation with a celebration that included a reunion of the pilot’s surviving family members and their descendants, the Lendo family. After the party, the restorers disassembled the SBD and carefully prepared it for a journey to the Pearl Harbor Aviation Museum on Ford Island on the 80th anniversary of the that Day of Infamy.
Taking its place in the Air Zoo restoration exhibit is another of the 38 Dauntless dive bombers that ended up at the bottom of Lake Michigan. An SBD-1, it began its service with the US Marine Corps on September 16, 1940, reported to NAS Glenview for carrier training duty in late 1941 or early 1942, and crash landed in Lake Michigan on November 23, 1942, claiming the life of its pilot, Ensign Herbert Wilton McMinn. On its way to the Air Zoo from MCAS Miramar, it was on display in the Warbirds area at EAA AirVenture Oshkosh 2021.
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Aircraft Reincarnation Through Air Zoo Restoration
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When it comes to aircraft, restoration and reincarnation may seem like synonyms, but there is a significant difference that transcends semantics.
Restoration is rehabilitating an airplane to a former point in its existence. Certainly, this is what the Air Zoo Aerospace & Science Experience is doing for US Navy aircraft of World War II salvaged from Lake Michigan, where more than 17,000 naval aviators received their initial carrier qualifications on the USS Wolverine and USS Sable, coal-powered side-wheel passenger steamers resurfaced with a flat top.
Reincarnation is a step beyond restoration. It revives the airplane’s soul by searching out and connecting with the people who originally gave it life. If they have succumbed to time, their memories and contributions to the resurrected airframes survive in the consciousness of their relatives and descendants. Identifying these people and sharing their contributions to the airplane’s life is part of the Air Zoo’s dedicated reincarnation effort.
Looking at the FM-2 Wildcat in the rotisserie that aligns and supports the front half of the fuselage while the restoration team builds and connects a new rear fuselage and tail feathers to it, Greg Ward, the Air Zoo’s aircraft restoration manager, explains how the Wildcat ended up on the bottom of Lake Michigan three days after Christmas 1944.
Ensign William Forbes lost power on the third of the required five takeoffs from the USS Sable. It rolled off the flight deck, turned upside down after it landed in the lake, and the ship’s port paddlewheel broke the Wildcat in two just behind the pilot seat. Strapped in that seat, Ensign Forbes “held his breath for nearly two minutes,” Ward said. “He got out of the cockpit, got picked up, survived the war, and lived a long, wonderful life in Fresno, California.”
The Wildcat spent 68 years on the bottom of Lake Michigan. “We’ve been working on it for about eight years, and we have maybe two or three years to go,” said Air Zoo CEO Troy Thrash. “When I got here in 2013, we didn’t have any other restoration projects,” Thrash said, and when the team learned about the FM-2 Wildcat, it wanted to submit a restoration proposal to the Navy.
“I said, yeah, we can, but we’re going to hang our hat on two things. The Navy already knows the quality of our work,” Trash said, referring to another Lake Michigan find, the SBD-3 Dauntless that’s long been on display in the World War II wing. “In keeping with our new missions, we’re going to restore the FM-2 differently than we or anyone else has done it; we’re going to do it on the exhibit floor where people can not only watch the volunteers work, they will have the opportunity to interact with them. Some days people are asking so many questions about the work they are doing the volunteers don’t get much done.”
Volunteers do most of the restoration work, Ward said, pointing at the people working around the shop. “Not all of them are [airframe and powerplant] mechanics. That guy over there is a financial analyst. They’re just people who like to work with their hands, like to work on airplanes, and love to work with other people who love to work with their hands on airplanes.” Most are recruited by word of mouth, and a good number of them have built their own airplanes, and several of them have won trophies for their craftsmanship at EAA AirVenture Oshkosh.
Restoring the Wildcat “created the mother of all challenges for our team,” Ward said. The Eastern Aircraft division of General Motors built the Grumman single-seat fighter during the war. “No one has ever said, “Let’s build the front half of an airplane and then build the back half, and then figure out how we can attach the two.” But that’s what they team had to do.
Part of the challenge was managing the stresses between the two halves. Every time they worked on it, the stress of the two halves warped the frame where they came together. The rotisserie, designed and built by a volunteer who’s a veterinarian, solved that problem.
And then there were unexpected and welcome surprises. “All of [the fuselage] stringers were extruded by the company that made them during the war,” Ward said. “It’s had several different owners since then, but when I called and gave them the part number, they said, “Oh, yeah, we’ve got those dies and can make them.”
The volunteers’ work is guided by plans and technical manuals and other documents acquired from a variety of sources, the US Navy and its National Museum of Naval Aviation as well as others who have restored siblings of the same make and model. “A lot of times we get drawings from the 1940s, blow them up, and discover we can’t read them,” said Thrash. “That’s just a piece of the puzzle, and if we can’t fix it, we make it.”
Making it is sometimes a matter of beating flat aluminum into shape on a hand-carved wood form that recreates the compound curves where the fuselage becomes the vertical stabilizer. “That’s the way I’ve always done it,” said Ward, who’s been at the Air Zoo for 33 years. “Now we use computers. Dan [Brant, deputy restoration manager] is really good at CAD drawings, and he saves us weeks and months of work by whipping them out on CAD and emailing the file to the waterjet cutting guy in Kalamazoo, who calls when the parts are ready for pickup.”
Picking up a dented and unrestorable curve of large diameter ducting that fed air to the Wildcat’s oil cooler, Ward said creating a new one would be more than a challenge. “General Motors has big 3D scanning equipment—they built this airplane back in the day—and they donated a 3D scan of it. Now we have a digital copy of it, and we used a 3D printer to make the form block and formed flat metal around it.”
Somethings only an original part will do, because making magnesium wheels for the SBD is beyond the their capabilities. “I bought these wheels cheap from another museum [that flies its SBD]. Being magnesium, you can’t get brakes for them, so they switched to Hellcat wheels and brakes, and that made them available.” The Air Zoo team didn’t worry about brakes because airworthiness is not the restoration (or reincarnation) goal.
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An Air Zoo View of Space
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In introducing the Air Zoo Aerospace & Science Experience, its president, Troy Thrash said it was purposely designed “to be a different environment for an air and space museum.” There is no better example of this than the exhibit focused on the lunar landing of Apollo 11 in 1969. Instead of telling the story with space hardware, the Air Zoo connects to the environment in which we all (at least all of us who were sentient beings then) shared in the experience, on TV in our living rooms.
Turning the corner to the exhibit, with its shag carpeting, cathode cabinet television on which Neil Armstrong made that first step for a man in an endless loop, and the fiberglass TV tray where many of us ate many a night, was a time traveling gut punch that stopped me in my tracks. It revived my mom and dad and shaved the decades of life from memory and put me rapt and cross-legged on the floor with my sister. Short of looking at Michael Collins’ lunar station at the Smithsonian Air & Space Museum, this is the most important Apollo exhibit I’ve ever seen because it allows people to relate to a moment in history personally and physically.
It’s a theme that continues through this section of the Air Zoo. Gort, the robot enforcer from one of my favorite science fiction films, 1951’s The Day the Earth Stood Still, and Robby the Robot, who first appeared in the 1956 film Forbidden Planet and made subsequent appearances in other films and TV shows, including Lost in Space, flank the portal to Alien Worlds and Androids. The Air Zoo rented the traveling exhibit in 2015, said Thrash, and set it up to expand the space exhibit and tell the story of planetary space exploration beyond the shuttle and space station. The exhibit’s owner retired it in 2019, and Kalamazoo is its permanent home.
Building on the theme of robotics and exploration of space, visitors meet other pop icons like C3PO, R2D2, and BB8, “and no discussion of exoskeletons would be complete without Iron Man,” said Thrash. Standing in testament to the possibility of other life forms is the eponymous Alien, which helps tell the story of the microbiome. “It’s a different way for kids to connect with science.”
But this section of the Air Zoo has not forsaken the hardware geek. There are wheels from several different Mars rovers, and capsules from Projects Mercury and Gemini. First, there is a Gemini crew trainer, a fixed spacecraft procedures simulator. The orange and white El KaBong is a boilerplate Gemini capsule that NASA used in tests of the Para-Sail Program, a Rogallo wing that replaced the traditional parachutes used to slow the final descent. “It is a NASA artifact, and it was in pretty bad shape” Thrash said. “NASA said if you want to restore it, you can display it here.”
The Air Zoo’s space has its own moon rock, from Apollo 15. But turning to the living room exhibit, this is “my favorite space,” Thrash said, and they christened it on the 50th anniversary of Apollo 11. “Everything here was donated by someone locally—this was in my house when Armstrong and Aldrin walked on the moon. It’s really cool to see grandparents come and sit on the couch and tell their grandkids this is where I was when it happened, watching it on TV.”