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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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Be Very Afraid of This Pilot
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After running this blog for three years or so I can honestly say I’ve seen and heard quite a few really interesting stories about the aviation industry. I’m headed to AOPA Summit in Tampa next week because I want to hear a few more.
The other day I got a note with a video link from another avid blogger, Max Trescott, the Digital Cockpit god at Max Trescott on General Aviation. Quite frankly it sent shivers down my spine even though the video ran just a few minutes.
I’m not sure precisely where it was shot, but it was a bunch of guys in a 36 model Bonanza providing chase plane photography services to an L-39.
It became terrifying to me as an instructor when the Bonanza inadvertently flew into IMC. In a flash, I caught a glimpse of trees flying past the windshield and realized how close these idiots all came to meeting their maker. Hang in when you watch it for the part where they survey the damage to the Bonanza after they land.
This video should be required viewing for every VFR pilot about the dangers of getting lost in the clouds. As Max said, “This pilot should have his license pulled.” Give the video a few minutes of your time and pass on the link. And if you ever survive a flight like this, turn the pilot in, please. You might just save a life or two.
Rob Mark
Technorati tags: Max Trescott on General Aviation, Golf Hotel Whiskey blog, Jetwhine, Flight training, VFR flight into IFR, aviation, pilots -
Ag Interest Reveals Risk Management Handbook
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Ag flying has always interested me because it is one of the last bastions of professional stick and rudder flying. Sure, technology has infiltrated the cockpit, but here it replaces the flagman (human or otherwise) who helps the pilot apply even coverage—not the pilot. Coordinating hand and eye and concentration still counts for something over farm fields.
This interest led me to act on an FAA Safety Team email that said: “You now have a new email preference to choose in your My Preferences Email Settings. If you are interested in receiving information about Aerial Application or Agricultural Operations, go to your My Preferences page and check that box. When Aerial Application information is emailed from FAASafety.gov, you will get a copy. It’s that easy!”
After signing up for the Aerial Application information, I decided to search the FAA Safety website to see what it had on the subject. First up was a link to the Risk Management Handbook H8383-2. Hmm? Never heard of it.
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The Top 10 Reasons They Missed MSP
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Just like Alice falling down the rabbit hole, unraveling the real story behind the Northwest/Delta Airlines crew who forgot to land at MSP just keeps getting curiouser and curiouser. Brings to mind the gap in the Nixon Watergate tapes. If that doesn’t ring a bell, just assume it has to do with people trying to cover something up. Unconfirmed reports from DC actually said the CVR tape on the Airbus was blank … as in erased.
Retired American Airlines pilot Jim Tillman told CNN’s Anderson Cooper the other night that the passengers were never in any real danger. REALLY? Once you pass the destination, the Airbus FMS switches to heading mode and would have made the Airbus continue toward Canada … until the airplane ran out of fuel. The only reason we can even poke a little fun at these two buffoons is that no one was hurt.
So in the interest of performing a valuable public service, to help everyone who flies regularly deal with the anxiety of wondering whether their pilots are awake and on duty the next time they see that bank vault of a cockpit door close before the push back, here are the Top 10 Reasons why the NWA crew might have missed dozens of radios calls and SELCAL alerts.
Number 10: They were texting
Number 9: It had something to do with sex
Number 8: Each pilot thought the airplane knew the way since Airbus aircraft are all automated anyway
Number 7: They really did just fall asleep
Number 6: They couldn’t decide who should have the Nintendo Wii next
Number 5: It had something to do with sex or money
Number 4: It had something to do with sex and money
Number 3: They were trying to understand NWA’s new slogan, ” We’ll get you within 150 miles of there.”
Number 2: The pilots actually have no idea why they weren’t paying attention
And the Number 1 reason why the NWA crew missed landing at Minneapolis: They were abducted by aliens, but were returned an hour later because even the little green men couldn’t stand to listen to these two guys whine about the company any longer.
Of course, these opinions do not necessarily represent those of Northwest or Delta Airlines. Did I miss any?
Rob Mark, editor
Technorati tags: Northwest Airlines pilots miss Minneapolis, jetwhine, airline pilots, air travel, Top 10 reasons to miss landing at Minneapolis, airline