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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.
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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What Covid-19 Didn’t Steal From Me
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RSS Feedby Micah Engber, contributor
(Listen to the audio)
In some ways, I’m very fortunate. Some of you know this from listening to my ramblings as I muse along on The Airplane Geeks Podcast. Sometimes it might be on The Airline Pilot Guy, or with Plane Talking UK. Occasionally you might even find me on The Plane Safety Podcast or with Leo LaPorte or Ron Ananian, The Car Doctor. Some even call me a podcast squatter.
Those of you who do know how this goes will know that I can go on and on. So why I’ve been asked to comment on my aviation life over the past year is both a mystery and well, maybe slightly anticipated. Not that I can make a silk purse from a sow’s ear, but maybe I can make a pigskin wallet.
What Did I miss?
In some ways, this year hasn’t been too terribly different from other years for me when it comes to aviation. Sure, I missed two events that are really important to me, events you may have heard about before.
There were the Smithsonian Air and Space Museum Udvar Hazy Center’s annual Innovations In Flight Day that was canceled in 2020. That event takes place every June and somehow or another, since its inception, The Airplane Geeks have been invited down to record a show, typically right in front of the B-29 Superfortress Enola Gay. Then we have a big meet-up with listeners that we hold in the evening at the Red Robin restaurant in Chantilly, Virginia. We’re still not sure if it will be happening in June 2021, but I already have my hotel reservations just in case.
And of course, there’s the Spurwink Farm Pancake Breakfast and Fly-In, sponsored by EAA Chapter 141 out of Limington, Maine. It takes place each year on the Sunday after 4 July in Cape Elizabeth, Maine, and yes, on Spurwink Farm. On 364 other days out of the year, 365 on leap years, Spurwink Farm is a big horse pasture on the high bluffs looking over the Atlantic Ocean, but on this one day in July, it’s a soft grass strip where GA aircraft from all over the northeast USA fly in for breakfast. It’s not a big air show, it’s hangar talk and pancakes, and real Maine maple syrup. It’s all over by 14:00, but it’s a lot of fun. And where and when else can you be walking around getting close up to look at airplanes and helicopters while being careful not to step in horse-chips?
But those are my only really big aviation negatives, not so bad when I think about it. I mean yes, Farnborough would have been nice, and sure, the Great State of Maine Airshow would have been terrific. After all, the Great State of Maine Airshow organizer, who fouled up my passes last time, promised me a shot at interviewing the Blue Angels this year. But those events will happen again in the future, and neither are annual so it’s not like I missed out on anything in my normal life.
Before COVID
In my normal life, I don’t really have the opportunity to fly as often as I would like. I mean the last time I was flying was September of 2019 when I was in a PT-17 Stearman at the Owlshead Transportation Museum’s Wings and Wheels Spectacular. Talk about spectacular, I mean not only was it amazing to be in the front seat of the beautiful open cockpit Stearman biplane, but I got to attend that event with Max Flight, Producer Extraordinaire of The Airplane Geeks Podcast, who traveled up from Hartford, Connecticut to visit with me. But the point is if I get in the air once a year it’s a lot.
You may think that’s sad, but it’s not, not when you think about what I do have, and what Covid didn’t take away. I have KPWM, the Portland International Jetport practically in my backyard, about a mile away. It’s not a big airport but it is friendly. They have a spotting area right next to the MacJets FBO. That spotting area overlooks the main runway, 11/29 but you can also get a good look at 18/36. It’s a great place to park, drink a cup of coffee, and listen to Live ATC. (more…)
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FAA Offers Homebuilders a Flight Test Carrot
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When amateur builders complete their homebuilt projects, if their work passes muster the FAA awards them an airworthiness certificate and an operational leash, a Phase I test period of usually 25 to 40 flight hours. The certification of the powerplant and prop combination plays a role in the Phase I duration.
Ideally, homebuilders have already read Advisory Circular 90-89, Amateur-Built Aircraft and Ultralight Flight Testing Handbook, and developed a series of flight tests cards that will, once flown, lead to all the necessary performance data and numbers that will allow builders to safely and efficiently operate their flying machines.
In talking to homebuilders and writing about the construction of their airplanes, I can count on one hand those who actually created—and completed—a flight-test plan. The majority of the others bored aimless holes in the sky for the prescribed Phase I test time.
When it comes to operational data, they often get by with the performance numbers provided by the kit manufacturer. Their airplanes are often heavier than the kit prototype, and they often include modifications and different engine and prop combinations. When asked if they adjusted the prototype’s numbers for these differences, they often say, “They are close enough.”
Close may work for hand grenades and nuclear weapons, and too often “close enough” aircraft performance numbers can be just as lethal. To motivate homebuilders to actually create and fly flight-test programs that reveal aircraft-specific performance data, in the draft update of AC 98-89B, the FAA temps them with a “operationally centric or task-based experimental aircraft flight-test plan.”
Instead of boring holes in the sky for a prescribed number of hours, the Phase I test period is completed when builders finish flying a flight-test plan as discussed in the AC, crunched the numbers, and compiled them in the airplane’s flight manual. The flight test plans do not need FAA approval, but they must include the flight test points discussed in the AC.
If builders do not want to create their own flight-test plan, they can use one provided by the kit manufacturer or other qualified sources. For those seeking the path of greater economy and efficiency, there is the EAA Flight Test Manual & Test Cards ($22.95). Introduced in 2018, it is part of EAA’s How-To Series, it steps through the required tasks, explains how to fly them, and how to crunch the resulting data.
The FAA is accepting comments on the draft AC 90-89B Change 1 through April 29. Maybe by AirVenture 2022 I’ll meet some homebuilders who snagged this Phase I carrot and are willing to share their opinions of its nourishment of aviation safety and efficient use of time.
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