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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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Aviation User Fees … They’re My Fault
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No one I know disagrees with the need to constantly upgrade the U.S. air traffic control system. We all know system demand is on the rise. We just disagree on who should pay, how much they should pay and whether of course the sky is actually falling the way FAA would like us to believe.
Now that the White House has pushed their camel’s nose under the tent through the funding plan Marion Blakey proposed a few weeks ago, the pace for approval is picking up quickly.
A few issues back, I made it clear I don’t believe FAA is capable of handling that upgrade though.
My rationale was that we can’t possibly trust an agency that hasn’t been able to deliver most of the upgrades it has suggested in the past and certainly not at the costs they estimated.
So why should we believe FAA can pull it off this time if we just give them large buckets of our tax dollars to play with?
There have been many succinct editorials about user fees such as those from AOPA’s Phil Boyer and NBAA’s Ed Bolen, made especially more heartwarming since there are Republican Senators like Trent Lott running around telling everyone they’ll need to pay more and that we should just be fair to the airlines. The administration’s plans have been short on details and filled with plenty of “trust us, the airlines really do have a case,” kinds of explanations.
Boyer made perfect sense when he said recently, “It’s time to take the ridiculous tax increase and user fees off the table so that we can have a meaningful dialogue on FAA funding.” Obviously the agency would rather avoid that possibility. (more…)
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Bad Aviation Publicity is Easy to Generate
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It was a quiet Sunday afternoon today in Chicagoland as the city struggled to make that final leap from Winter to Spring.
I was out walking the new dog when I heard what sounded like a small airplane about to connect with some serious trouble.
The engine was alternating, first high power, then low. When I finally saw the airplane, I recognized it as a Piper Pacer.
I live northeast of ORD near Lake Michigan under the veil of the Class B airspace. To those of you outside the U.S., that means this airplane
could not legally be flying much more than 1,000 feet above the ground.
But this Pacer was even lower, probably around 400 to 500 AGL. Evanston is an old Chicago neighborhood with 50-year old trees in every direction. And at low altitude, the airplane would never glide to the lakeshore.
As the airplane continued circling, my neighbor happened to walk by and saw me looking up. “What the heck is wrong with that airplane?” he asked. That’s when I realized the airplane wasn’t losing any altitude. And the funny engine noises had stopped. Then the engine wound up and down again and the airplane began to descend.
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Situational Awareness; Even ATC Loses it Sometimes
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There is nothing worse than flying into busy terminal airspace when the weather is bad and the pilots are feeling like they’re four or five minutes behind the airplane. The captain’s and first officer’s hands are moving furiously around the cockpit moving switches, updating the FMS and responding to the radio all the while listening to an ATC professional – yes, probably a NATCA member I bet – safely sort it all out from the ground.
Sometimes though, no matter how good it sounds coming out of the person’s mouth, it’s clear their brain is just not in the same place. And with the lack of patience most passengers have these days, as well as pilots at times, ATC delays are usually no laughing matter.
Just like pilots though, ATC does sometimes completely “lose the picture,” as controllers call it. Take a listen to this ATC ground control session at JFK where that happened to a controller.
But this guy stayed professional and rolled with the punches and best of all, didn’t lose his cool. And neither did any of the pilots, a few who whom were making this fellow’s job even more difficult because they were obviously confused as well.
Nice job guys!
Technorati tags: Air+traffic+control, JFK, NATCA