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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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Hearing on U.S. Pilots in Brazil Called a "Circus"
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When Joe LePore and Jan Paladino — the two U.S. Legacy pilots, where released from house arrest in Brazil late last year, everyone wondered if they’d ever be called back to testify.
And let’s face it, we’ve all wondered what we’d do if we were in their places when our presence was demanded in a country with a system of justice so different from our own. Would any trial, could any there be fair?
The two pilots were indicted last week and charged by the Brazilian Federal Police with being responsible for the mid-air collision over the Amazon that claimed the lives of all 154 people aboard a Gol Airlines Boeing 737. Four Brazilian air traffic controllers were also charged in the tragedy although the final aviation safety report detailing any probable cause is not yet complete.
Some members of Brazil’s Camara dos deputados, the equivalent of the U.S. House of Representatives, expressed outrage Wednesday at a hearing in Brasilia on the accident where Embraer employee Daniel Bachman testified. Bachman, the Brazilian-born son of two Americans, was a passenger on the Legacy. (more…)
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Altitude Chambers Don’t Cut It For Pilot Training
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In all the years I’ve been regularly flying airplanes above 10,000 feet, I’ve never experienced high-altitude/hypoxia training beyond reading the section of the Flight Training Handbook and hearing a few lectures about the dangers of what might happen if the air should rush out of the cabin up high.
After what I experienced this week, I’m convinced every pilot who flies at high altitude needs better hypoxia training than the regs require for a checkout to comply with Part 61.31 (g). Even a trip to an altitude pressure chamber is not enough.
I spent a few days this past week on assignment for Aviation International News at Flight Safety’s DFW training center for a hands on demonstration of that company’s hypoxia training curriculum.
I ran into an old friend – Dan MacLellan – who happens to be the center manager there. Gil Schnabel, the center’s assistant manager and Larry Schuman FSI’s director of special training made all the pieces come together for this trip. (more…)
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GPS Units Will Make Attractive Planters
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What a difference a letter makes.
In yet another dose of infinite wisdom, the FAA recently transformed millions of dollars worth of avionics into window boxes when it released the updated “A” version of AC 90-100.
The Advisory Circular that outlines Terminal and Enroute RNAV operations in the U.S., lists which specific GPS units are approved for IFR operations. The AC became effective immediately when it was released in March.
From the talk on the net, few people actually realized the impact the change would have on aircraft operating in the IFR system. Now, dozens of major GPS units from Honeywell, Chelton, Trimble and Northstar, in addition to many earlier Garmin units, can no longer substitute for ADF or DME equipment requirements on IFR approaches for many Part 91 and 135 operators that depend upon them for access to non-hub airports.
FAA says the changes were made in order to “harmonize with ICAO performance-based navigation criteria as well as the lessons learned from the initial U.S. RNAV implementation.” (more…)