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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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Hail the Centennial of Aviation’s Modern Era
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Born this month in 1903, powered flight matured quickly during its adolescence that ended with World War 1 in 1918. That conflict was a period of accelerated puberty for aeronautical technology that in 1919 marks the beginning of aviation’s modern era.
If you need a birthday, there’s none better than May 22, 1919. That’s when New York hotel owner Raymond Orteig offered his eponymous prize of $25,000 to the first allied aviator or aviators to fly nonstop between New York and Paris. (Raymond Orteig, right, and the 1927 winner of his eponymous prize, Charles Lindbergh.)
Orteig revealed the award in a letter to the Aero Club of America. “Gentlemen: As a stimulus to the courageous aviators, I desire to offer, through the auspices and regulations of the Aero Club of America, a prize of $25,000 to the first aviator of any Allied Country crossing the Atlantic in one flight, from Paris to New York or New York to Paris, all other details are in your care.”
The Aero Club of America confirmed its participation three days later, on May 26, and established a structure to administer the competition for the $25,000 prize. It doesn’t sound like a lot of money today, but in today’s dollars, it is $374,090.24. (And given the price of a new single-engine piston airplane today, it’s still not a lot of money, but I digress.)
A few weeks later, in June 1919, John Alcock and Arthur Brown made the first nonstop transatlantic flight in a modified World War I Vickers Vimy bomber. Their accomplishment didn’t qualify for the prize because they flew from St. John’s, Newfoundland to County Galway, Ireland, not New York to Paris. It did net them the £10,000 prize, awarded by the Daily Mail, a London newspaper.
Alcock didn’t survive to year’s end. He died, at age 27, at the controls of a new amphibious airplane, the Vickers Viking, on December 18, 1919, in foggy skies at the first post-war aerial exhibition at Cottévrard, an aerodrome near Rouen in Normandy, France. Three days before he died, Alcock was present when the transatlantic Vimy was presented to the nation at London’s Science Museum, where it remains today,
Two weeks before Alcock and Brown left Newfoundland, about the time that Orteig was writing the Aero Club of America, a U.S. Navy Flying Boat, the Curtiss NC-4, commanded by Lt. Commander Albert Read, made the first transatlantic flight. With a crew of five, it took the NC-4 23 days, and six stops, to fly from Naval Air Station Rockaway, New York, taking off on May 15, arriving in Plymouth, England, on May 31, after stops in the Azores, Portugal, and Spain.
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The Last Photo Banshee Represents a First
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As a former Navy photographer’s mate, the big aerial cameras under the long, windowed nose of the dark blue straight-wing jet drew me to the McDonnell F2H-2P photo Banshee. It was the Navy’s first photoreconnaissance jet. And the airplane on display was the last example, the sole survivor.
But that’s not what got my attention. The explanatory placard said that this airplane, its wing and fuselage filled with concrete, after a barge ride down the Indian River in 1959, spent nearly 30 years as a kiddie-climber at Pocahontas Park in Vero Beach, Florida. The National Museum of Naval Aviation didn’t acquire the airplane until 1988! And then it spent thousands of hours chipping out the concrete and carefully piecing the airplane back together using period parts.
Top dead center of the panel is the pilot’s viewfinder. He used it to sight his subject and to rotate the cameras from the vertical (straight down) to horizontal (oblique) positions. At night, two under-wing stores carried 20 flash bombs. With its electric heat, the windows in the camera bay did not frost up at altitude. And it could get up there. The long-legged (1,475 miles) jet had a maximum operational ceiling of 48,500 feet, and its speed (535 mph at 10,000 feet) made it a hard target for other Korean-era jets to catch.
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Could Knowledge of Undisclosed MCAS Have Saved Lion Air 610?
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Could Knowledge of Undisclosed MCAS Have Saved Lion Air 610?
By Rob Mark
Having spent more than a few decades in the cockpit, I thought even I’d reached that plateau where I could claim I’d just about seen it all … until this week’s admission by Boeing of an – until now, unknown – automated AoA related stall-prevention system called MCAS that, even when the aircraft is being hand flown, could yank the control column away from an unsuspecting pilot.
Details are of course still sketchy, but I’m dumbfounded that anyone at Boeing could be so certain of a computerized system aboard the 737 Max 8, that they saw no need to mention its existence to operators or pilots.
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From Flying eNews, November 15, 2018 …
In what some pilots are calling an inconceivable moment in flight operations and training, Boeing recently admitted the existence of the maneuvering characteristics augmentation system (MCAS), an angle of attack related stall prevention system that was unknown to operators of the Boeing 737 Max 8 aircraft, like the one flown last week by a Lion Air crew when it departed Jakarta Indonesia. The Lion Air crew experienced an unexpected nose pitch down shortly after takeoff as the aircraft was passing through 5,000 feet. Unable to recover from the event, all 189 people aboard perished in the crash that followed.
While it’s too early to draw any solid conclusions, there appears to be a circumstantial link between the, until now unknown MCAS and the angle of attack error messages reported early on following the Lion Air accident. The FAA last week issued an emergency airworthiness directive against the 737 Max 8 that said, “erroneously high single angle of attack (AOA) sensor input could result in “repeated nose-down trim commands of the horizontal stabilizer,’ which could be from the MCAS,” according to the Aviation Safety Network.
Operators of the 737 Max aircraft wasted no time making clear their feelings about Boeing’s apparent oversight in the release of MCAS information. In a message yesterday, ASN says the Allied Pilots Association (APA), which represents American Airlines Group Inc. pilots, alerted its members … to the MCAS saying “it applies nose down stabilizer in specific conditions when the aircraft nears a stall,” the first time many pilots were made aware of the system’s existence.
The APA said the logic behind MCAS was not mentioned in training or in any other manuals or materials. Safety Committee Chairman Capt. Michaelis stated, “It’s pretty asinine for them [Boeing] to put a system on an airplane and not tell the pilots who are operating the airplane, especially when it deals with flight controls,” according to the ASN.
A Boeing message quoted by the APA said, “the MCAS (Maneuvering Characteristics Augmentation System) is implemented on the 737 MAX to enhance pitch characteristics with flaps UP and at elevated angles of attack. The MCAS function commands nose down stabilizer to enhance pitch characteristics during steep turns with elevated load factors and during flaps up flight at airspeeds approaching stall. MCAS is activated without pilot input and only operates in manual, flaps up flight. The system is designed to allow the flight crew to use column trim switch or stabilizer aisle stand cutout switches to override MCAS input. The function is commanded by the Flight Control computer using input data from sensors and other airplane systems.
A January 2018 report of the new Boeing’s created by the Brazilian ANAC briefly mentions the MCAS, but offers no specific guidelines on its operation. Whether the Lion Air 610 crew had any knowledge of the MCAS’s existence prior to their October 29 takeoff is unknown. Sources said Boeing risk assessment team felt the chances of the MCAS going off in flight were so remote, they felt an explanation of the system was unnecessary
Boeing told Flying through a prepared statement in part, “We are taking every measure to fully understand all aspects of this incident, working closely with the investigating team and all regulatory authorities involved … Safety remains our top priority and is a core value for everyone at Boeing. While we can’t discuss specifics of an on-going investigation, we have provided two updates for our operators around the world that re-emphasize existing procedures for these situations.”
Capt. John Weaks, president of Southwest Airlines Pilots Union (SWAPA) quoted in the Wall Street Journal said, “We’re pissed that Boeing didn’t tell the companies and the pilots didn’t get notice obviously, as well. But what we need now is to make sure there is nothing else Boeing has not told the companies or the pilots.”
Reprinted by permission of Flying magazine
Rob Mark is also Publisher of Jetwhine.com