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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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NPRM Offers New Part 23 Airplane Lexicon
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If the recently released Part 23 Notice of Proposed Rulemaking survives the comment and review period and makes it to a final rule, old, new, and prospective pilots will have to learn a new airplane lexicon. But don’t hyperventilate, like the NPRM itself, it is simple and straightforward.
Based on aircraft weight and propulsion, the existing Part 23 divisions are Normal, Utility, Acrobatic, and Commuter. As proposed, say good-bye to the last three. All new Part 23 airplanes will be certificated as Normal, in one of four Airplane Certification Levels (ACL) determined by the maximum number of seats:
Level 1 — for airplanes with a maximum seating configuration of 0 to 1
passengers.
Level 2 — for airplanes with a maximum seating configuration of 2 to 6
passengers.
Level 3 — for airplanes with a maximum seating configuration of 7 to 9
passengers.
Level 4 — for airplanes with a maximum seating configuration of 10 to 19 passengers.This works in concert with the Airplane Performance Level (APL). It replaces the existing propulsion-based divisions, which were established with piston-powered airplanes were traditionally slower than those with turboprops. To quote the NPRM, “These assumptions are no longer valid. Airplane certification based on performance levels would apply regulatory standards appropriate to airplane’s performance and complexity.” So the Normal Part 23 airplane will be either:
Low Speed — for airplanes with a design cruising speed (VC) or maximum operating limit speed (VMO) ≤ 250 KCAS (or MMO ≤ 0.6).
High Speed — for airplanes with a VC or VMO > 250 KCAS (or MMO > 0.6). -
MH370 Two Years Later: Has the Industry Changed?
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MH370 Two Years Later: Has the Industry Changed?
It’s anniversary time, but March 8 won’t be a happy day to reminisce.
Two years ago, Malaysian Airlines Flight 370 (MH370), a Boeing 777, disappeared from the night skies over the South China Sea on what should have been a routine flight to Beijing from Kuala Lumpur. All 239 people aboard disappeared along with the airplane.
Only one confirmed piece of MH370 wreckage has been located, a section of the 777′ s flap that washed ashore near Reunion Island last year, some 4000 miles west of where an intensive search operation has been combing the ocean floor for nearly two years.
The theories about what happened to this airplane are as varied as the beer and wine probably consumed before most of those theories went public. Me, I have no idea what happened to the flight.
Lessons Learned?
What’s crucial for our industry however, is understanding what steps the airlines and regulators around the world have taken over the past two years, solutions to make international travelers sleep a bit easier after their next ticket purchase.
To the surprise of a couple of local Chicago WGN-TV anchors I spoke to last week, the simple answer to what’s changed since March 2014 is not much at all. Another airliner could go missing just like MH370 because although a few plans have been released, tracking the location of an airplane anywhere on the planet is no different today than when we lost MH370.
That doesn’t mean no one is trying to solve the problem of course.
A year after the Malaysian 777 disappeared, most member states of the United Nation’s aviation arm, the International Civil Aviation Organization’s (ICAO), agreed that air traffic control anywhere on the globe should be able to receive location updates from an airliner at least every 15 minutes and once a minute if the aircraft were in distress. They’ve also recommended new methods of recovering flight data recorders from downed aircraft. But recommendations shouldn’t be confused with solutions. Some of ICAO’s newest recommendations won’t take effect until 2021. (more…)
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Bomber 21? Why Not Build a Better B-52?
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The U.S. Air Force opened the doors on its new, and as yet unnamed, long-range strike bomber, the B-21. The contract pasted in the cockpit window said each bomber would cost $500 million and the total program cost for a fleet of 100 B-21s would be $80 billion. Yeah, like that will happen.
Given the tradition of cost overruns and schedule delays, we can expect only two things with any certainty. First, the bomber will succeed the F-35 as the nation’s most expensive weapons program, and it will guaranteed a century of service for the B-52.
Like all the bombers that have come since B-52 entered service in 1955, the B-21 is supposed to replace the heavy-hauling daily driver of the bomber fleet. Brought to you by the same company that delivered the B-2 Spirit at $1.157 billion each, the B-21 will likely become another pampered plane, a winged Lamborghini, that only comes out of the garage when it’s a nice day.
If the Air Force is going to make a “better” B-2 with the B-21, why not get more for the taxpayer’s money by building a better B-52 by following the precedent set by the P-8 Poseidon, based on the Boeing 737, and the KC-46 Pegasus, based on the Boeing 767. Why call up the computer design files for the Boeing 787-9 Dreamliner and save them as the foundation for the new B-52? Given their sticker prices, we could get two for the price of one, at least until the “military discount” increases the 787’s price.