-
Making the Brazilian ATR-72 Spin
by
No Comments
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…)
-
How the FAA Let Remote Tower Technology Slip Right Through Its Fingers
by
No Comments
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.
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…)
-
2020: General Aviation’s Coffin Corner?
by
No Comments
In aviation “coffin corner” is where bad things come together. I learned the term long ago, reading about the U-2, in Francis Gary Power’s book, if I remember correctly. When flying at the upper edge of its envelope, a single digit separated the redline speed that could pull the wings off the fragile bird, and the stall speed, the minimum velocity needed for those wings to produce lift. While I understand the aerodynamics involved, the concept of flying with so little margin for error still boggles my mind.
Aviation, it seems, is facing another coffin corner, one best defined by a year: 2020. It may well be the apex union of challenges that might be inscribed on general aviation’s seed shrouded memorial marker at some forgotten, deserted airport. Mention the year 2020, and most in aviation immediately think of the January 1, 2020 deadline for being equipped with ADS-B. And that is, indeed, a challenge for all aircraft owners, one that poses a terrible decision: upgrade or sell the airplane on or after the deadline for some giveaway price.
This is where the other wall meets the mandate to form the corner. 2020 will begin the final stretch of the next presidential election, and what happens between now and then will surely play a huge role in the decisions every general aviator must make. Where to start?
-
The Few. The Proud. The New Student Pilots
by
No Comments
On the road to our favorite brewpub for date night I noticed a new billboard for the U.S. Marine Corps: “We don’t accept applications. Only commitments.” The smallest member of America’s armed forces, it meets its recruitment goals by challenging volunteers to meet the Corps’ uncompromising standards. In other words: Not everyone can be a Marine. Becoming one is not easy. Do you have what it takes? Can you sustain your commitment when the rigorous training seems beyond your capabilities? Reflecting on my experience with the Corps during my naval service and after it, the Marines steadfast challenge to meet its standards might work equally well in recruiting new student pilots.
As the declining trend of student pilot starts suggests, and the roughly 80 percent who decide to pursue a less challenging activity before they solo or earn a certificate confirms, becoming a pilot is not for everyone. History suggests that making the training easier by eliminating its more challenging aspects—spin training and the recent amendment of how to teach slow flight come to mind—perhaps taking a lesson from the Marines will reduce the number who quit before certification. And in the process it might improve efforts to reduce accidents resulting from loss of control.
Posing this challenge will affect students and their instructors because the latter will have to change the way they teach.
Teaching maneuvers separately and with a rote by-the-numbers setup and recovery does not prepare students for real world situations. There are certainly many ways to accomplish this, and I had the good fortune to fly with teachers who employed several of them. One of the most effective was to discuss a situation on the ground, say a spin resulting from an uncoordinated turn from base to final, and then to make the point in the airplane. What made it effective was the true point of the teacher’s demonstration.
-
Same Plane, New Name & Accomplishments
by
No Comments
Exploring the Smithsonian Air & Space Museum’s Udvar-Hazy Center, I saw this blood red P-51C hanging from the ceiling, and I immediately knew that this plane had to be Paul Mantz’s Bendix air racer that finished first in 1946, and again in 1947.
Getting close enough to read the name under the cockpit, I wondered who Capt. Charles F. Blair might have been? And what was the link to Pan American World Airways? The white letters on the long cowling said this was the Excalibur III and not Mantz’s revolutionary racer.
Little did I know of this plane’s record-setting flights and its contribution to the Cold War fears of bombers and missiles loaded with Soviet nukes making their way to America via the North Pole.