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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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Shades of Captain Sulley
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The world watched in awe a few months back as Capt. Sullenberger put a US Airways A320 just where he wanted it – well so to speak – on the Hudson River, close by to a half dozen small boats that allowed for the quick rescue of all aboard. For those of you who might not be aware of the physics part of flying, energy management on an aircraft with no power is a Herculean task. On a large aircraft, the task is even more critical, although much of the thought process is the same.
My Twitter pal @jenniferwhitely posted this link to the cockpit video of the shuttle Atlantis returning from space to a dandy touchdown at the Kennedy Space Center. Take a gander. It only runs a few minutes and it offers a view of the returning world from the pilot’s perspective through the device called a Heads Up Display that gives an aviator all the information they need in one place as they continue to peer out the front window searching for the runway.
Pay close attention to the numbers flying past on the right side of the screen. That’s the altitude you’re seeing. The video picks up at about “84.” That means 84,000 feet. The airspeed is along the tab on the left. Although they’re only indicating about 280 knots, the True Air Speed (TAS) is about Mach 2.0 at points, roughly 1400 mph.
Watch the last 20 seconds or so of the approach too.
It is virtually impossible to tell the different between this shuttle instructor giving the pilot a few guidance tips and one of us riff-raf instructors coaching a student down an ILS in a Cessna 172. Listen in on how important the wind picking up turns out to be for this glider, especially as the aircraft crosses the end of the runway at 300 knots.
Enjoy.
Technorati tags: Twitter, Jennifer Whitely, Shuttle Atlantis, Kennedy Space Center, flight instructors, gliders, energy management, flight training -
CAP Helped F-16s Follow Canadian Skyhawk
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The failed suicidal cross-country flight of 31-year-old Adam Leon drew a lot of media attention here in Wisconsin. When it was clear that he was approaching Madison (he never got closer than 5 miles), Governor Jim Doyle ordered the capitol evacuated. Curious about the details of this odyssey that started in Thunder Bay, Ontario, an online news search revealed that the Civil Air Patrol played an important role in this saga.
In watching the “virtual view” many national TV news programs created of the two Fighting Falcons flying formation with the Skyhawk, most pilots probably made comments similar to mine, some variation of “no way.” Anyone who’s watched a 172 and F-16 fly can easily guess that the jet lands at a speed faster than the middle-aged Cessna can cruise.
My guess is that the F-16s followed the 172 using a scissors maneuver. Imagine a coordinated series of syncopated Lazy-8s, climbing and descending turns at a constant speed that keep the jets in the the green and the target in on of their heads-up displays. The Cessna’s 14,000 foot cruising altitude probably made it a lot easier on the intercepting pilots.
Being what it is, the military does little without practicing it first. Sneaking up behind unsuspecting low-and-slow civilians is a no-no, so how, I wondered, do the guard pilots practice? Is there some black squadron of Cessnas and Pipers acting as an intercept adversary squadron? As tantalizing as that prospect might be, the real answer, provided by a TV news report no less, is just as surprising.
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Certified Flight Attendants
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Most airline passengers understand that pilots are required to qualify initially through FAA guidelines, are also required to regularly undergo a physical exam just to make sure some small problem doesn’t lead to incapacitation aboard a flight.
Did you know that flight attendants are not normally required to undergo any kind of regular physical exam? When they’re hired sure, but not after that. Flight attendants also don’t fall under any FAA certification guidelines. Once the company says they are good to go, that’s it.
Most good airlines do require recurrent cabin training for flight attendants, but those standards are not near as rigorous as for pilots. But regular FAA required physicals, nope.
Although a few bone-headed flyers believe a flight attendant is around in case they want a snack or a drink, flight attendants are FAA required personnel on any airliner of more than 19 seats. Those men and women are there for the safety of passengers in an emergency. Drinks and snacks are incidental.