Mid-air collision over Boulder, Colorado (US)

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2 Aircraft Collide & Crash; Glider Being Towed Survives

Post by FSTargetDrone »

Gist of it is, an airplane is towing a glider and a second airplane collides with the towplane. Glider cuts loose and flies "through the fireball" and then lands safely. All aboard the 2 aircraft are dead but the glider passengers are safe.

Notice the burning aircraft with its parachute intact. According to another story I saw, there is video of this incident, but I don't need to see it. The pictures are grim enough.

Story:
Midair plane crash kills 3 in Colorado
By Kevin Vaughan and Kirk Mitchell
The Denver Post
San Jose Mercury News
Posted:02/07/2010 12:00:00 AM PST

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BOULDER — Three people died Saturday afternoon in the fiery midair collision of two small planes in the skies north of town, but three others escaped unharmed after the pilot of a glider being towed by one of the aircraft cut loose, maneuvered through a fireball and landed safely.

The glider pilot, identified by a family member as Reuben Bakker, touched down at Boulder Municipal Airport about 3 miles southeast of the crash site with his two passengers, a woman and her 11-year-old son.

Investigators had feared that a thorough examination of the charred wreckage, which was scattered over an area of more than a mile of city open space, would reveal two more victims but later concluded there were no more.

"I was driving into Boulder looking north and saw a big, orange fireball in the air, and then I saw what looked like wings going down," said Ed Dillon, one of scores of witnesses who saw the immediate aftermath of the collision.

Work was underway Saturday night to positively identify those who died, said Jennifer Rodi of the National Transportation Safety Board, the lead investigator on the crash.

Joan Pallone of Broomfield, who declined to comment when contacted by The Denver Post, told the Duluth (Minn.) News-Tribune that two of the victims were her brother-in-law, Bob Matthews, and his brother, Mark.

"It's absolutely horrifying," she told the newspaper.

Dominic Pallone, another family member, posted a message on Twitter .com that described the two as "great, peaceful, kind men with wonderful families."

According to Federal Aviation Administration records, a Cirrus SR20 — the same model as one of the planes that crashed Saturday — is registered to Robert Matthews of Boulder.

Rodi said a single-seat Piper Pawnee left the Boulder airport towing a Schweitzer 2-32 glider. About 1:30 p.m., a Cirrus SR20, which seats four, collided with the Pawnee in the air on the north edge of the city, near where U.S. 36 and Broadway converge.

The exact sequence of events in the moments of the collision was not clear, Rodi said, given conflicting accounts.

It was an excellent day for flying — scattered clouds, a very light haze and visibility of at least 5 miles.

The crash's immediate aftermath was witnessed by countless people all over Boulder whose attention was drawn to the sky by a thunderous bang.

"It sounded like somebody throwing a heavy object into an empty metal Dumpster," said Shano Kelley, who was working in his jewelry studio a quarter-mile away. "It had a deep thud to it."

He and others described a horrific scene — an overpowering thud, fire in the sky, people jumping from the burning wreckage as the remains of the planes plunged to the ground.

Glider safely lands

In that instant, the glider pilot cut loose from the cable that was towing the craft, flew through flaming debris and headed back to the airport. The woman who was on the glider with her son declined to identify herself when she was approached at the Boulder airport. Composed but grim-faced, she said she felt lucky and was grateful to the pilot who got them back on the ground safely.

As the glider cut loose, the Pawnee and the Cirrus both lurched out of control.

"I saw two fireballs arc away from each other," said Joshua Berman, a Spanish teacher who was returning from a camp in the mountains with middle school students.

The Pawnee plunged to the ground, crashing in open space northeast of the point where Broadway converges with U.S. 36.

The Cirrus was equipped with an airframe parachute designed to allow the plane to float to the ground in an emergency, and it deployed.

Rodi said it was too early to know whether the collision led the parachute to open or whether someone on the plane activated it.

Sue Patton, 53, and her 8-year-old daughter, Sarah Weller, ran outside just in time to see two people plunge out of the plane. Patton said it appeared to her that they jumped.

"The plane was burning really strong," she said. "They really didn't have a choice."

Patton wasn't alone.

"We saw a person fly out of the plane," said Rob Zimmerman, who was with a friend outside American Legion Post 10 at 4760 28th St.

Patton grabbed a phone, called 911 and ran in the direction of the plane, which was spiraling downward with a plume of black smoke billowing from it.

With the parachute deployed, the burning wreckage slowly pirouetted to the ground.

"It was kind of a slow-motion thing," Patton said. "It was surreal."

She ran northeast of her property about 200 yards to the plane, which was fully engulfed in flames.

"Mainly, I wanted to see if there was any chance they could survive," Patton said.

"There were about 30 other people running as fast as they could to the plane. I did not see any motion in there."

She said she also looked around the mesa for the people she'd seen come out of the plane but couldn't find anyone.

The Cirrus landed on a hillside, where it burned until there was little left but a blackened hulk. The only recognizable part of the plane was the tail.

"The airplane came straight down," said Craig Perkins, who was outside the American Legion post. "It was on fire. When it was about 500 to 750 feet off the ground, I saw the guys start to jump."

West of the crash site, Andy McLandrich and Rachael Britton were hiking the hogback when they heard the crash and turned in time to see the explosion.

"I could hear the engine still spinning, and then I heard it hit the ground with a huge thud," McLandrich said.

Flying through fireball

Deborah Tjarks, the mother-in-law of the glider pilot, said Bakker saw that a collision was imminent, released the tow line that attached him to the Pawnee and banked but still flew through a fireball.

The Pawnee and the glider were operated by Mile High Gliding.

According to information published on the company's website, a flight over Boulder in a glider could be had for as little as $99.

Although the glider has only two seats, the NTSB's Rodi said a child could ride in an adult's lap in the back seat. And, in fact, information on the Mile High Gliding website said two passengers could ride in the glider if their combined weight was less than 300 pounds.

Rodi said it would be eight to 10 months before the initial investigation is complete and several months beyond that before the NTSB would determine the probable cause of the crash.

"It's just a matter of going slowly and methodically," Rodi said.

Staff writers Heather McWilliams, Annette Espinoza and Daniel Petty and The Associated Press contributed to this report.

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Mid-air collision over Boulder, Colorado (US)

Post by Broomstick »

Mid-air collision today between a tow plane towing a glider and a Cirrus aircraft (that's a small, 2-seat aircraft). It's notable for a couple of things, such as the glider flying through a fireball left by the colliding airplanes (all aboard the glider landed safely, though), video shot by one of the passengers aboard the glider, and what appears to be a dual fatality in one of the safest airplane designs around.

Rather than skip directly to a story I'll give what I know from several sources. There is some conflicting information out there, so I make no guarantees what follow is 100% accurate.

The towplane was towing the glider (duh!) and was at around 2,000 feet above ground (around 600 meters) when the Cirrus impacted the towplane. The glider pilot, who had two passengers (reportedly a commercial ride, that is, "flight seeing" and not a formal lesson) disengaged the tow rope prior to impact and, as mentioned, flew through the resulting fireball prior to landing safely at the local airport. (Good job, glider pilot!). The tow plane is, from what I gather, a Piper Pawnee which is a single-seat airplane used for such things as crop spraying and, well, towing gliders - a lightweight, powerful aircraft with a high payload capacity. It may have lost one or both wings, in any case, it was apparently set on fire during or just after the impact. Regardless of details, the pilot did not survive impact. The Cirrus clearly was on fire during the descent. Now, the Cirrus incorporates MANY safety features most small airplanes do not, among them, air bags for pilot and co-pilot (in airplanes those are on the seatbelts) and a whole-plane parachute that can be rapidly launched in an emergency. Those parachutes have been quite effective when used, however, this crash is an illustration that a parachute won't always save your life. Someone on board the airplane lived long enough after the crash to pull the deployment handle (contrary to some reports, deployment is NOT "automatic") but both on board were dead before they touched down. They almost certainly burned to death, or asphyxiated on poisonous fumes (the Cirrus is largely composite and plastic - when burning they are highly toxic).

This is what remained of the Cirrus after the crash. You can see that the parachute survived quite nicely...
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This report is not entirely accurate in some details, but gives a good overview and also has a video link of the flaming Cirrus descending under parachute.

The BBC also has the video, with no commentary, but it looks like a slighter larger picture.

This CNN has a different video from another viewpoint. The accompanying article gets most of the details right, except where the eyewitness says he saw a parachute but no one attached to it. That's because an entire airplane was attached to it, not a person, but probably most people aren't aware of whole-plane parachutes. However, to someone with any familiarity with 'chutes it's obvious something is attached to it by the way it is descending.

Post #15 of this thread has a post from Xema, who has a contact in Boulder. I've known Xema via the Internet for some time, he is also a pilot, and I consider him a reliable source:
I spoke to a soaring friend in Boulder, who had some additional info (which is probably fairly accurate, but not necessarily perfect):

The towplane had a transponder on board. (The Cirrus almost certainly did as well.)

The glider was a ride: a commercially rated pilot was carrying two passengers (there is one model of glider that can carry three people). One passenger had a video camera which recorded the collision. The NTSB (National Transportation Safety Board - responsible for investigating accidents) now has that video.

The collision happened around 2000' AGL and was definitely between the Cirrus and the towplane - not the Cirrus and the towrope. The Cirrus caught fire and burned all the way to the ground, where it was almost entirely consumed by fire. The Pawnee lost one or both wings and went rapidly to the ground.

Despite some reports of five fatalities, the correct total seems to be three: two aboard the Cirrus and the pilot of the Pawnee.

The Cirrus was apparently a transient aircraft, not based at Boulder or a nearby airfield. My friend says that the proximity of Colorado University and the scenic vistas make this a popular area for sightseeing flights, which have been something of an issue in the past. There is plenty of notice about the level of routine activity (including gliders) at Boulder, but pilots not from the area aren't always aware of this.
The thread also references a VERY poorly written article - no, let's be honest. If the referenced link was printed on paper it would only be fit for wiping shit off one's ass. If anyone is uncertain as to why it is unadulterated shit I will explain it, but only if there is interest in the exercise.
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Re: Mid-air collision over Boulder, Colorado (US)

Post by FSTargetDrone »

Oops, I'm afraid I posted something about this in N&P a few minutes before this. Perhaps a mod can merge the threads?
Someone on board the airplane lived long enough after the crash to pull the deployment handle (contrary to some reports, deployment is NOT "automatic") but both on board were dead before they touched down. They almost certainly burned to death, or asphyxiated on poisonous fumes (the Cirrus is largely composite and plastic - when burning they are highly toxic).
Broomstick, in the report I found, there are 3 witnesses who describe people who "jumped" (or fell) from one of the aircraft (presumably the Cirrus). Have you seen anything else to jive with that?

Must have been a hell of a ride in that glider. Do you have any idea how long the towline might have been? Or, how long are they typically?
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Re: Mid-air collision over Boulder, Colorado (US)

Post by Broomstick »

FSTargetDrone wrote:Broomstick, in the report I found, there are 3 witnesses who describe people who "jumped" (or fell) from one of the aircraft (presumably the Cirrus). Have you seen anything else to jive with that?
No, but it wouldn't entirely surprise me - people are known to choose death by gravity over death by burning. It would most likely be a deliberate exit - the Cirrus seat belts are 4-point harnesses, when you're strapped in you're very securely in the seat. There's no indication of the airplane falling apart, just burning. Yeah, they would have had to unbelt and open the door, but the mechanisms to do that are pretty straightforward, and the parachute does give you time to operate everything before hitting the ground.
Must have been a hell of a ride in that glider. Do you have any idea how long the towline might have been? Or, how long are they typically?
For glider competition I think the maximum length is 50 meters (around 160 feet) but this wasn't a competition flight. I don't think there's a set length for pleasure flights, but consider that a ballpark figure. It's not going to be a whole lot shorter or longer than that.

I have flown a glider, once. There is a big, usually red, emergency lever in the cockpit to allow you to release the rope, both when you are at your planed height or in an emergency. The release is very rapid. Glider pilots, even on a first lesson, are trained that on the way up if anything Very Bad happens to the tow plane first thing you do is pull that lever and bank away, which is exactly what this guy did. Likewise, there's a similar lever in the tow plane. There is nothing you can do for whoever is in the aircraft other than yours, except get out of the way, so the focus is on saving yourself in event of an accident or malfunction.

There is also a deliberate weak spot in the rope which will, under the right conditions, snap and disconnect the two.
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Re: Mid-air collision over Boulder, Colorado (US)

Post by FSTargetDrone »

Broomstick wrote:No, but it wouldn't entirely surprise me - people are known to choose death by gravity over death by burning. It would most likely be a deliberate exit - the Cirrus seat belts are 4-point harnesses, when you're strapped in you're very securely in the seat. There's no indication of the airplane falling apart, just burning. Yeah, they would have had to unbelt and open the door, but the mechanisms to do that are pretty straightforward, and the parachute does give you time to operate everything before hitting the ground.
I was curious because in that one picture of the Cirrus wreckage, there don't appear to be any sheets covering bodies (or remains), so if they jumped they may have ended up some distance away. Assuming the picture wasn't taken before people arrived to cover any visible remain, but there are several people standing nearby, one of whom looks like a police officer.
For glider competition I think the maximum length is 50 meters (around 160 feet) but this wasn't a competition flight. I don't think there's a set length for pleasure flights, but consider that a ballpark figure. It's not going to be a whole lot shorter or longer than that.
Thanks. I was just wondering about how close that glider would have been behind the towplane when the collision happened.
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Re: 2 Aircraft Collide & Crash; Glider Being Towed Survives

Post by LadyTevar »

I'm glad the glider pilot saw what was coming in time to free himself from the tow-craft. Flying through the fireball was probably more adventure than anyone cared to have, but the pilot should be commented for his quick actions.

However, I'm betting "pilot Error" will be the cause found :(
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Re: Mid-air collision over Boulder, Colorado (US)

Post by LadyTevar »

Topics merged, as requested, and moved to N&P
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Re: 2 Aircraft Collide & Crash; Glider Being Towed Survives

Post by Broomstick »

LadyTevar wrote:I'm glad the glider pilot saw what was coming in time to free himself from the tow-craft. Flying through the fireball was probably more adventure than anyone cared to have, but the pilot should be commented for his quick actions.

However, I'm betting "pilot Error" will be the cause found :(
In this it is almost certainly pilot error. Pilots are responsible for not hitting other aircraft while flying. Mid-airs nearly always mean one or more pilots fucked up that part of flying

The airport has no traffic control tower, therefore pilots are responsible for managing traffic flow. This is not really a big deal, MOST airports in the US are like that and mid-airs are rare. However, you only have to be careless once....

There are several factors involved that might have contributed. The Cirrus is a high wing and the Pawnee a low wing - one classic scenario is that high wing and low wing airplanes have "matching blind spots, so if the high wing is lower and the low wing higher it might be impossible for them to see each other... but I have no idea if that is what happened. The tow pilot was, supposedly, using a standardized and published "tow pattern", which means a flight path reserved for pilots towing gliders, but if the Cirrus was a transient and unfamiliar with the airport he might not have known about it... although you are supposed to research your destination, and any airports you plan to stop at. I won't even call all of that speculation, it's just possibilities and there is, at this point, no way for us to know.

In this case assuming pilot error, much as it pains me to say it, is a very reasonable course to take.
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Re: Mid-air collision over Boulder, Colorado (US)

Post by LadyTevar »

By "Matching Blind Spots", I assume you mean that the wings of each would hide the other plane from view until that critical moment?
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Re: Mid-air collision over Boulder, Colorado (US)

Post by Broomstick »

Yes.

Fortunately, this example did not end so tragically as today's, in fact no one was injured and the airplanes essentially undamaged, but it is an excellent illustration of the problem:

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(Plant City, Florida, 2000 - really, they were very fortunate)
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Re: Mid-air collision over Boulder, Colorado (US)

Post by Count Chocula »

The SR20 and Piper Pawnee are both low-wing designs. The Pawnee is very very commonly used for crop dusting, along with the Grumman Ag-Cat, but it obviously has the horses to pull a glider (secondhand observation on my part, because my experiences with a glider have all been looking at a high wing Cessna 180/185). The glider was probably a Schweitzer or maybe a Grob, and while they are magnificent gliders, their roll rate (due to their long wings and small roll control spoilers) ain't all that great. Also, gliders typically climb to altitude lower than their tow planes; this allows the glider pilot to keep an eye on the tow plane and vice versa for a high-wing tow plane, and reduces drag and engine load on the tow. All of that aero shit means that the pilot of the glider had no choice but to take his plane through the fireball, which would have been the wreckage and flaming avgas of two airplanes falling through his altitude. The glider pilot did a magnificent job saving himself and his passengers.

It appears that the SR22 pilot fucked up by the numbers, and killed himself, his companion, and an innocent pilot. This story sucks and is another reminder that flying, while very very safe compared to ground trasportation, is also very very unforgiving of stupidity or inattention.
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Re: Mid-air collision over Boulder, Colorado (US)

Post by FSTargetDrone »

Count Chocula wrote:The glider was probably a Schweitzer or maybe a Grob, and while they are magnificent gliders, their roll rate (due to their long wings and small roll control spoilers) ain't all that great.
One of the articles above mentions a "Schweitzer 2-32 glider" and the "Mile High Gliding" website mentions "Schweizer 2-33" and "SGS 2-32" gliders. Spelling is seemingly wrong in the news article, given what Google comes up with. Anyway, here is the Wiki entry on the Schweizer SGS 2-32.

Oh, just for the hell of it, here is a YouTube video apparently filmed at Mile High Gliding In Boulder using the 2-32. The video was added in January 2009. It is NOT the video of the accident.



Just imagine how fast that glider pilot had to react, given the distance between the glider and towplane...
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Re: Mid-air collision over Boulder, Colorado (US)

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That's why glider pilots sometimes keep their hand on the release lever during the ascent, if an emergency occurs you may have only a fraction of a second in which to act appropriately. That's why flight training emphasizes emergency drills so much, your response to certain things must be automatic due to time constraints.

The glider being towed is not a passive participant during the operation. You have to actively fly the glider so it remains properly lined up with the towplane, and you have to maintain awareness of what is going on around you (in the video you can see the pilot looking around at the sky).

And :banghead: for thinking the Cirrus was a high wing, I should know better.

But yeah, the Cirrus pilot will almost certainly be found at fault. Towplane+glider has right of way in airport traffic because the two linked together aren't nearly as maneuverable as a single powered aircraft.
A life is like a garden. Perfect moments can be had, but not preserved, except in memory. Leonard Nimoy.

Now I did a job. I got nothing but trouble since I did it, not to mention more than a few unkind words as regard to my character so let me make this abundantly clear. I do the job. And then I get paid.- Malcolm Reynolds, Captain of Serenity, which sums up my feelings regarding the lawsuit discussed here.

If a free society cannot help the many who are poor, it cannot save the few who are rich. - John F. Kennedy

Sam Vimes Theory of Economic Injustice
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