-
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…)
-
AirVenture Anticipation: Meeting the Martin Mars
by
No Comments
Coming face-to-face with a truly rare airplane is one of aviation’s singular rewards. And to actually see it fly, oh, be still my fluttering aviation geek heart. The Martin Mars is coming to EAA AirVenture Oshkosh, and for the first time since I don’t remember when, I will secure a prime spot on the flight line when it appears on the air boss’s schedule. When it is not flying, the huge four-engine flying boat will be bobbing somewhere on Lake Winnebago, and I must find the spot that will let me watch its transition from a liquid fluid to the vaporous fluid that sustains life—and powered flight.
Being the last flying example of the five Martin Mars ever built makes the airplane rare. What makes it special, at least to me, is that it closes the circle, as large flying boats go, with my first quest to see a unique and formerly unseeable airplane, the Hughes H-4 Hercules, more commonly known as the Spruce Goose, because the two airplanes are related, in a way. Either by design, in the H-4’s case, or ultimate mission, for the Mars, both of them were cargo carriers safe from marauding submarines, albeit in different oceans.
Needing to get material across the Atlantic, where German U-board wolf packs roamed, the War Department issued a requirement for a flying cargo ship, preferably made of something other than the “strategic materials” of aluminum and steel. The contract for the Mars, originally designed as a Navy patrol bomber, was issued in 1938. A scaled up version of Martin’s twin-engine PBM Mariner, it first flew in 1942, about the time the War Department let the contract for the Hercules.
-
H.R. 636 Will Help Fix ATC Staffing, I Hope
by
No Comments
I’d like to interrupt your afternoon for just a minute before you head out the door for the weekend. Congress is expected to vote next week on another FAA funding extension – H.R. 636 – and the industry’s hoping it’s all thumbs up … but not just because a majority vote will keep the agency’s lights on until October 2017. Passage of H.R. 636 will also help the FAA fix a staffing crisis it created all by itself a few years ago, even though the agency hiring system in place at the time worked just fine. A quick review of the problem.
The National Air Traffic Controllers Association (NATCA) last week detailed how passage might affect the hiring crisis the FAA created in December 2013.
“The number of fully certified controllers working today is at a 27-year low, a crisis made worse by FAA’s inability to meet its own hiring goals in each of the last seven years. NATCA believes FAA must take a holistic, collaborative approach to resolving these staffing concerns. If passed, the extension as drafted would streamline the hiring process by allowing experienced controllers to be hired quickly; military veterans and graduates of schools in FAA’s Collegiate Training Initiative (CTI) would also be hired more expeditiously. CTI graduates and veterans would be considered in a separate pool from the general public. The extension would also increase the maximum entry age for a controller with 52 weeks experience to 35 years of age, another provision we applaud. Similar language sponsored by Reps. Carlos Curbelo and Sean Patrick Maloney in H.R. 5292 has received strong bipartisan support, with 237 co-sponsors.”
Of course there are other significant industry reasons Congress needs to pass the FAA extension as the NBAA‘s president Ed Bolen added.
“This extension is also important because of what it includes, and what it leaves out. For example, we are pleased that the bill reflects some key general aviation priorities, such as the inclusion of third-class medical reform for pilots of small aircraft, and provisions focused on the safe integration of unmanned aircraft systems into the airspace. Equally important, the bill does not include risky proposals for creating a privatized air traffic control system, funded through new user fees. Clearly, our community’s tremendous mobilization against ATC privatization funded by user fees has made a difference.”
That means it’s time to hit the NBAA’s list and tell your Representatives to say “Yes” to H.R. 636 and say “No,” by the way to H.R. 4441, the proposal to privatize ATC and pay for it with user fees. It took just two minutes of my time to send a letter. BTW, the letter’s function offers you a chance to customize the content, so be sure and add this sentence … “Passing H.R. 636 will also help fix the ATC staffing crisis the FAA created by changing its hiring standards in December 2013.”
You’re now free to return to goofing off the rest of the weekend. Thanks.
Rob Mark, Publisher