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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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Seething About the Buffalo Crash
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I don’t know what makes me more angry, the story in the Wall Street Journal that claims investigators are pointing the finger of blame at the pilots of the Dash 8 Q400 in the Buffalo crash a few weeks ago, or that from a pilot-training perspective we seem to be reliving a reality that should be all too familiar after the ice-related 1994 ATR crash in Roselawn Indiana, as well as the Brasilia crash near Detroit in 1997.
The issue of pilot qualifications and training are sure to make headlines again soon, as well, after Buffalo – not to mention pilot hiring standards, crew duty times and an overall focus on the bottom line. The historic conflicts between NTSB recommendations and actions taken by the still leader-less FAA are certain to get in the way as well.
While the NTSB’s job is gathering all the facts to determine a probable cause, I – as a flight instructor – see issues related to wing contamination that should be well-known to other aviators, like letting the autopilot fly the aircraft in icing conditions. I’m not waiting for every single detail to emerge before I remind students and fellow pilots that ice of any part of the airplane is nothing to screw around with. It seems senseless that any pilot is forced to reread the basics of aerodynamics on lift generation, but as long as people keep breaking airplanes in ice, we seem to have little choice. The myriad of NTSB accident reports related to ice are a great place to begin reinforcing the deadliness of complacency around contamination of wings and tail plane.
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EMS Helicopter Safety: First, Do No Harm
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A confirmed rotorhead, I recently invested some unexpected free time looking into the NTSB’s public hearing on Safety of Helicopter Emergency Medical Services (HEMS) Operations. I didn’t have the time to watch four days of video available, so I settled for the executive summary in the NTSB’s Special Investigation Report on Emergency Medical Services Operations, which includes four safety recommendations.
Now at the top of its Most Wanted List of Transportation Safety Improvements, what attracted the NTSB’s attention were the 41 HEMS crashes, 16 of them with fatal consequences, between January 2002 and January 2005. The report said HEMS flight time grew from 162,000 hours in 1991 to an estimated 300,000 hours in 2005. And so did the accident rate, from 3.53 accidents per 100K to 4.56. Last year was the worst on record. Four of the 35 fatalities perished when an independent medevac helo hit a guy wire on a 734-foot radio tower near Aurora, Illinois, one VFR night last October. The patient was 13 months old. The company suffered its first fatal accident in 2003, and this one put it out of business.
The NTSB report never said it directly, but I inferred that the medevac pilots were seen as cowboys, riding to the rescue on rotary wings no matter what. Or maybe I’m oversensitive and took the NTSB’s four recommendations the wrong way. What do you think? 1. Conduct all medical flights in accordance with Part 135 regulations. 2. Develop and implement flight risk evaluation programs. 3. Require formalized dispatch and flight following procedures that include current weather. 4. Require terrain awareness and warning systems (TAWS) on all EMS helicopters.
To get some perspective, I called the local air medicine program, ThedaStar, which is just up the road at Theda Clark Medical Center in Menasha. There I met Flight Nurse Pam Hillen, who’s been flying ThedaStar since it first took wing in 1986, and Ron Ries, a high-time pilot who launched his helo career with the Army and still flies Blackhawks for the Guard. Making it clear that they could only speak for how ThedaStar operates, Hillen said the patient’s condition is not a factor in the go/no-go decision. Why? The first rule of medicine, she said, is “First, do no harm.” Last year ThedaStar flew 498 patient missions, and didn’t launch on another 300, mostly because of weather.
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A Boston Tea Party for TSA
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The heart and soul of social media – blogging, Twitter, podcasting and a host of other new tools – is its ability to create a buzz around an issue – often within within seconds – much the way we saw with Janis Krum’s TwitPic post of a US Airways Airbus hitting the icy waters of the Hudson River last month, proving again that the ways we communicate with each other about anything and everything are evolving in front of our very eyes. It is time for aviation professionals to raise their fists against a piece of impending legislation in the pattern of our forefathers 250 years ago.
Sending a Signal
On December 16, 1773, American colonists stopped shouting and took action to protest an act of their then overseers, the British Parliament. Outraged at what they considered an unfair taxation policy on tea, citizens dressed as American Indians, climbed aboard freighters docked in Boston harbor and dumped thousands of tons of tea into the water to send a signal to London that the little people were not happy about government treatment of this necessary part of Colonial life.
Aviators … it’s our turn again.