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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.
Max Trescott photo 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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An iPad in Every Student’s Flight Bag?
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At every turn, it seemed that everyone at EAA AirVenture 2012 had an Apple iPad, except me and one or two others. Aviation apps were hot items this year, and several of them would make effective, essential tools for pilots in training.
First up is Jeppesen’s new e-book versions of its well-respected pilot and maintenance technician manuals. They are starting with the private pilot and mechanic texts, but in due time all will be available at the Apple iBookstore. The library weighs nothing and once downloaded, accessing each volume using the iPad full suite of features doesn’t require an Internet connection. When they begin instrument training, students should consider Jepp’s Mobile FliteDeck new Version 2.0. Among other features it provides a paperless cockpit, and its announcement coincided with new JeppView nav data subscriptions that offer greater flexibility and economy.
More important for students is Lightspeed’s FlightLink app for its new Zulu.2 ANR headset. Connected to the headset battery box by a cable, the free app is a cockpit voice recorder that records the entire flight (or other specified time) and gives instant recall of the last 2 minutes by touching the appropriate point on the narrow graphic audio display on the left side of the screen. The rest of the screen is a digital scratch pad, as Lightspeed’s Teresa De Mers demonstrates here.
Some may consider this app nice to have but not essential. If you’re a student at any level, think again. But back in the microcassette days I learned first hand that recording every flight lesson was an invaluable tool that made every flight more educationally productive. Let’s face it, like all students who are learning to fly a real, live, vibrating, noisy airplane in the air with other airplanes nearby, I was only half listening to the important things my CFI was telling me.
By listening to the tape after each lesson, I didn’t need to repeat the flight—and the mistakes—until I finally heard her. Once was enough. This app is way better than my old microcassette recorder, and the Zulu.2 ANR headset is not only light and effective, it comfortably fit my big ears and fat head. A cable connects the iPad to the Zulu.2’s battery box, and the audio quality is superb, complete with the headset’s ComPriority and Bluetooth connectivity for streaming stereo music or phone connections.
To answer the headline’s question, yes, an iPad should be in every student pilot’s flight bag, and from what I saw at AirVenture, that doesn’t mean students will have to buy one, they just need to bring it along. — Scott
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AirVenture Debuts Offer Better Flying Future
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With its huge, preselected aviation audience, EAA AirVenture is the ultimate dog-and-pony stage on which many companies debut new hardware and software. Significant this year are new airplanes that offer a good balance between price and performance, technology that improves the educational process, and flight schools that, one hopes, make training more efficient, economical, and palatable to today’s time-stressed prospective pilots. If properly adopted and employed, individually and as a whole, they have the potential to create a brighter future for aviation.
Cognizant of the demands on your time, I’ll share this AirVenture bounty by topic in separate posts.
Let’s start with the surprise debut of the RV-14. The IO-390-powered side-by-sider is an aerobatic two-seat RV-10. Preceded by no warning and few rumors, it led a line of every Van’s RV model down to the restored RV-1, flown by Dick VanGrunsven himself, which was presented to the EAA AirVenture Museum.
The RV-14 embodies 40 years of Van’s Aircraft kit building experience, so its match-holed aluminum pieces will become an airplane quicker and with less head scratching. With an 810-pound useful load, on 210-hp it’ll cruise at 195 mph. More important to the future of aviation, two large people fit in it comfortably. That includes me, at 6-foot-5, 260 pounds, with a 38-inch inseam and size 15 feet. Estimated build cost is around $90K, depending how much glass one puts in the panel. Compare that to a new store-bought airplane of similar performance, and DIY really pays off. A taildragger version is in the works.