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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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FAA’s Bobby Sturgell Needs to Check His Voicemail … Now
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Knowing when to call for help is a critical element in learning to fly, in fact, it’s pretty darned important for survival in life as well. In an emergency, most people often don’t have the mental and sometimes the physical skills to see them through. Two or more heads really do work better than one.
The National Air Traffic Controllers Association sent out a news release and organized a telephone press briefing today to explain their declaration of a controller staffing emergency. As many of you may know, I spent 10 years of my life pushing airplanes in VFR towers and radar rooms myself in another life so being short staffed is not exactly a new topic for me. I’m not going to rewrite the news release here. I’d encourage you to go look for yourself. The statements are pretty eye opening.
What really made my jaw drop today though was the private e-mail I saw from a regional NATCA rep. It read simply, “Please help us, help us.”
Staffing levels at ATC facilities are still dropping due to retirements, faster than FAA can backfill with experienced people. FAA imposed a contract on controllers in 2006 right after John Carr left office as the union’s president. With terms imposed on them, controllers began leaving the agency rather than work under rules they had no part in adopting.
But there’s more to the story than simply the numbers of veteran controllers the agency is losing. These same veteran controllers also work a second job of sorts as on-the-job instructors for new hire air traffic controllers. The loss of experienced instructors to guide the new people is a crisis unto itself.
Mayday
While NATCA and I have not always agreed on everything, as a pilot and a former controller, today’s Mayday trumps everything, much like we saw an Alaskan bush pilot save four people on Saturday. When someone calls for help, you dive in help and ask questions later.
The dramatic increase in the number of close calls both on the ground and in the air over the past six months, as well as the November GAO report warning that safety in the nation’s skies will become even more compromised without significant change seems to be falling on deaf ears at 800 Independence Ave. Controllers are working way too much forced overtime to make the system function.
Listening in on the conference call with NATCA’s president Patrick Forrey plenty of reporters had questions, most focusing on whether the airspace around one particular airport or another is safe. What I asked Forrey was about the leadership issue at FAA – or the lack of it – my particular hot button, not of course that safety of airspace isn’t.
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Boeings Don’t Like Water Much Either
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I remember early on in the computer revolution when laptops first moved to the forefront of mobile computing.
They were much heavier than today’s models,
but they certainly made connecting on the road a valuable option for many of us road warriors.
But those machines did have their limitations.
They didn’t take shock very well – dropping turned them to instant trash. They also didn’t like mixing with liquids as many a traveler found out when they spilled a cup of java on a keyboard. But seldom was anyone’s life threatened by a damp Dell.
Airplanes are – thankfully – designed much differently with multiple redundancies … or at least I thought they were until I saw the report about a major electrical failure aboard a Qantas 747 on arrival at Bangkok.
If you’re an instrument-rated pilot you’ll probably cringe when you read this. If you’re simply a frequent flyer though … well, you’ll probably cringe too.
The Australian said a generator control unit aboard the Qantas Boeing 747 failed about 15 minutes outside Bangkok killing all the cabin lights and depriving the aircraft of electrical power from all the working generators. Luckily the aircraft was on approach and landed with no incident. But that’s not the scary part.
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Alaskan Bush Pilot’s Life and Death Decisions Saves Four Crash Victims
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A Piper Navajo Chieftain crashed just after takeoff Saturday into the icy waters off Kodiak Island Airport about 250 miles southwest of Anchorage.
Initial reports indicate the left nose baggage door on the aircraft opened up right after liftoff. Six people, including the pilot, were killed in the crash.
Miraculously however, four passengers survived the frigid 35 degree waters after being rescued by the pilot of a nearby floatplane, a de Havilland Beaver. Dean Andrew, owner of Andrew Airways based in the nearby town of Kodiak was just preparing for takeoff from the company’s maintenance base at Kodiak Airport at the time of the crash.
I don’t know Dean and have only spoken to him once briefly by phone on Monday night when I called to say thanks to a guy who was doing what all of us aviators would have done in a similar situation … turn a crisis into a chance for some to live. I have many hours in the left seat of a Navajo so this crash made a profound impact on me.
Andrew told me, “I haven’t slept much since Saturday although I did get a little more sleep last night. I keep going over this whole thing again and again in my mind wondering what else I should have done to help get those other people out.” Early reports say the Coast Guard needed almost two hours on site after the crash to extricate the victims from the wreckage.
I asked Dean Andrew what he remembered about the scene. “I heard the distress call on the tower frequency because I was just getting ready to takeoff myself,” he said. “After the crash, I flew just a few feet off the water to where the tower controller told me he’d seen the aircraft hit. I had to land downwind. The swells were pretty high since the wind must have been about 30 miles an hour. That’s when I saw two people standing waist deep in the water on a piece of wreckage.”