-
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…)
-
Airline Fees = Ticket Tax Avoidance
by
No Comments
During the State of the Union Address, President Joe Biden said he wanted to crack down on airline “junk fees” that airlines added to their ticket prices. Given the motivation for the ever expanding menu of these fees, I’m not holding my breath for their demise. Simply put, these fees are exempt and do not contribute to the price of a ticket that’s subject to the 7.5% tax that airlines pay to support the national aviation infrastructure. General aviation pays its way with taxes on avgas and Jet-A.
This reality is rarely mentioned in media coverage of the junk fee vendetta. It is easier—and attracts a larger audience for the advertising media (are clicks and page views the media’s junk fees?) than digging into the history of the subject. Or maybe it doesn’t matter because avoiding taxes that support an industry-supporting culture is so commonplace that it is considered the American way. Given the frequency of airline close calls and railway disasters, it sure seems to be the case lately. Or maybe it is just coincidence.
In a thumbnail history, airline junk fees were born with airline deregulation in the 1980s, which introduced low-fare lines to the marketplace. To compete, the legacy lines subtracted their costs for baggage (and everything else, over time) and provided for the service that used to be covered by the ticket price. And when the government let them use this scheme to reduce their ticket tax bill, the new era soon became firmly entrenched.
Last year the Department of Transportation published a notice of proposed rulemaking that would “require U.S. air carriers, foreign air carriers, and ticket agents to clearly disclose passenger-specific or itinerary-specific baggage fees, change fees, and cancellation fees to consumers whenever fare and schedule information is provided to consumers for flights to, within, and from the United States.”
Really, it doesn’t matter if this proposal becomes a final rule. Either way, passengers will still have to pay the fees, the fees are still exempt (as far as I can discern), and the airlines are still getting away with their ticket tax avoidance to support an aviation infrastructure designed with them as first in line. If we really want to be fair about it to all Americans, add a line to the NPRM that makes the total cost of the ticket and all of its fees subject to the infrastructure-supporting ticket tax. — Scott Spangler, Editor
-
Aerostats: A Stratospheric Gulf of Tonkin?
by
No Comments
The recent political and military focus on aerostats—balloons—and the resulting cyclone of incomplete communication of verifiable concrete details, the confusion resulting from people demonstrating that they possess no knowledge or understanding of what they are talking about, and premeditated disinformation that supports their individual agendas brings to mind the Gulf of Tonkin Incident.
For the forgetful or those for whom history is a tedious exercise that impedes their current plans, in 1964 the administration of Lydon B. Johnson manufactured a single incident into a situation that “justified” further American participation in its next long-term conflict. It seems now that the USS Maddox, a destroyer conducting covert signals intelligence in the Gulf, did share the Gulf with three North Vietnamese patrol boats, but the government created the subsequent attacks to support its decision to get the military more involved.
The situation with the Chinese reconnaissance balloon seems eerily familiar. Other than taking the government’s word for it, there has been no verifiable display of concrete proof that the balloon was actually Chinese, and that it we dedicated to collecting intelligence of the areas it floated over. Call me a cynical skeptic, I won’t believe what the government says—and the media reports—until the balloon’s are open for public display and inspection, like the Russians did with the remains of Francis Gary Power’s U-2 in 1960.
Like the manufactured subsequent “attacks” in the Gulf of Tonkin, the government has ordered the downing of two other aerostats. They have suspended the search for the resulting wreckage, and the only telling “proof” so far released was some audio of some poor F-16 pilot who said he couldn’t go slow enough to get a good look at the target.
Duh. It is an aerostat. As anyone whose enjoyed a flight in a hot air balloon, even inf the breeze is blowing at triple-digit jet stream speeds, there is no slipstream because it floats with the wind. Wind speed matters most on takeoff and landing because it tells you how quickly the breeze will drag you across the terrain. Because an aerostat goes where the wind blows, that’s why the Department of Homeland Security tethers its radar surveillance balloons to Mother Earth.
Early reports by reputable media outlets like the New York Times repeated the claims of unidentified by knowledgeable sources that the Chinese could control the flightpath of their balloon. There’s been no proof of the systems that might make this possible. Now, it seems, copy editor and fact checkers are starting to calm the political hysteria of guiding public opinion through being afraid of something. Which, unfortunately, always seems to be the point of these manufactured situations.
The only thing the government—any government—truly achieves through such shenanigans is that the people they are trying to control through fear take their distrust of the government to a higher level (and yet, we continue to reelect them, which says equally as much about our society). Logic suggests that in such situations, people would demand, and the powers involved would calmly convey the situation and share the evidence openly in the light of day. And when they don’t, that says something in that evidence contradicts the ultimate goal of their premeditated agenda. Scott Spangler, Editor
-
Finding Space Weather Reports
by
No Comments
If you keep reading the Aviation Weather Handbook, FAA-H-8083-28, you’ll learn that space weather reports are officially known at the Space Weather Advisory in chapter 26.7. It is a newcomer to the universe of meteorology. The International Civil Aviation Organization (ICAO) brought it into being in late 2019.
It unites the services of four “global space weather providers.” In the United States, the NOAA Space Weather Prediction Center (SWPC) is the go-to source. Then there is the consortium of space weather agencies from Australia, Canada, France, and Japan (ACFJ). Next in the space weather acronym parade is PECASUS, for the Pan-European Consortium for Aviation Space Weather Services. Finland leads this group that includes Belgium, the United Kingdom, Poland, Germany, Netherlands, Italy, Austria, and Cyprus. The China-Russian Federation Consortium (CRC) rounds out the quartet.
On a rotating basis, the members of this space weather quartet issue global Space Weather Advisories when processes are occurring on the Sun or in the Earth’s magnetosphere, ionosphere, and thermosphere that could have a potential impact to the near-Earth environment. The specific targets are high-frequency communications, satellite communications, satellite-based navigation and surveillance systems (GNSS), and when heightened radiation occurs above Flight Level 250.
When space weather crosses one of ICAOs predefined thresholds for moderate (MOD) and severe (SEV) impacts, the member of the quarter whose turn it is issues a Space Weather Advisory. The table presenting the thresholds subdivides the effects, sub-effects, and MOD and SEV impacts within the advisory areas. Of operational interest to aviators are possible degraded or unreliable services.
In 6, 12, 18, and 24-hour forecasts, the Space Weather Advisory defines the affected area of the globe in one of three ways. The easiest to picture is the Daylight Side. Then there are six pre-defined 30°-wide latitude bands that work their ways north and south from the equator. Finally, there is a polygon patch defined by latitude and longitude coordinates.
The handbook next delves into the alphanumeric format of the Space Weather Advisory. If you’re interested in seeing it, or you need to comprehend it to increase your operational safety, set aside some study time.
For the merely curious, spending time on NOAA SWPC website is more rewarding. The color-coded Space Weather Scales break down the consequences, from extreme to minor, for Geomagnetic Storms, Solar Radiation Storms, and (most important to aviators) Radio Blackouts, subdivided by HF radio and the spectrum of navigation systems.
A single glance at the SWPC homepage briefs you on the 24-hour observed maximums and latest observed conditions for R (radio blackouts), S (solar radiation storms), and G (geomagnetic storms) based on the scales. When I looked at them, each reported “none.” It lists some of the condition below, such as “Solar Wind Speed: 468 km/sec.”
The site provides current (space) news and features on such topics as the “Green Comet” and more specific information for the various space weather communities, including aviation, GPS, radio communications, satellites, and space weather geeks. Because it’s listed first, I’m guessing the Aurora community is the most popular, which seems only right and true for space weather’s only esthetically pleasing consequence. — Scott Spangler, Editor