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Midair Collision over Denver

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Re: Midair Collision over Denver

#151
Wow, the 'can opener' effect is intense. Insane that the plane held together, so much structural loss.

Reminds me of the Aloha Flight 243. My mom's cousin was the pilot and hearing his first hand account was pretty crazy. Fun fact, he got to be an extra in the made for TV movie of the event.

https://www.thisdayinaviation.com/tag/robert-l-schornstheime...

Re: Midair Collision over Denver

#152

Earlier quoted context omitted.

Have you ever seen the optional 7th seat for a PA-32? It makes for 3-across in the back row which makes the backseat of a 911 look positively roomy.

I just looked at photos. Yes, it's very small. Here's a Piper ad from 1966 with seven adults and their bags: https://i.imgur.com/fWyArRH.png "The SIX will carry up to seven adults and their luggage - in real comfort" And here's an ad from 1969 with six adults in it (and some rifles. a different time!) https://i.imgur.com/kGMrENf.png I can't read into the minds of the engineers who made the airplane. Maybe it's true "…

The useful load of a PA-32 is about 1500 lbs, so yes, you can put 7 180-lb adults in it and still have a little margin. What you cannot do is carry 7 adults plus their bags plus full fuel. Even without bags, you could not go very far with a full plane.

Some planes have more margin: the Cessna 182 for example is a four-seater and can carry full fuel plus 800 lbs, so you really can load it up with four people plus bags and still go somewhere.

But all planes will be close to their operating limits when fully loaded. Even a jetliner will typically be very close to its operating limits on takeoff and pilots have to pay very close attention to this. If you think about it, this has to be the case. If it weren't, the plane would have been over-designed and much more expensive than it has to be, and so it would lose to the competition.

Re: Midair Collision over Denver

#153
post #66
post #7

Just in case anyone (like me) is thinking - wait did that aeroplane have a parachute? From: https://en.m.wikipedia.org/wiki/Cirrus_Airframe_Parachute_Sy... The Cirrus Airframe Parachute System (CAPS) is a whole-plane ballistic parachute recovery system designed specifically for Cirrus Aircraft's line of general aviation light aircraft including the SR20, SR22 and SF50. The design became the first of its kind to becom…

What are the problems with making such a system for large passenger aircraft (perhaps with multiple parachutes)?

I'll add on to the good points other have made here - smaller planes tend to fly out of small airports in the suburbs or the countryside. Larger planes fly out of much more urban areas, where there are a lot more obstacles, making a safe landing less probable.

Re: Midair Collision over Denver

#154
post #60

Video of the cirrus chuting down: https://twitter.com/DenverChannel/status/1392560583950561281 A photo of the airborne metroliner with fuselage blown open: https://imgur.com/gallery/yKPOWR0

The plane flying missing half the fuselage suggests to me that fuselage was excessively strong (and therefore heavy and expensive). A tube is only strong when complete. Cut away half the tube and bending resistance probably goes down ~10x.

The structure would be designed around an adequate fatigue life. I wouldn't be too surprised if fatigue considerations were such that in "normal operations", stresses could well be 10x lower than the ultimate material strength.

Re: Midair Collision over Denver

#155
post #62

Wow, that's incredible. Goes to show that people do walk away from plane crashes with some regularity. My father was a pilot[0]. He sold his plane about 15 years ago (to a group of owners, one of which was a priest, I'm sure there's a joke in there). A few of winters later, he was called out to Romeo Airport; the pilot flying the plane that was formerly his had crashed the aircraft a few miles short of the runway in…

> The weight is so critical that the 7-seat plane can realistically only seat 4-5 adults. I remember being shocked that they had to weigh the paint they applied when he had the plane re-painted. I used to work in general aviation. If my eyes could fly a loop in my skull they would have. Were the occupants required to use the bathroom before flying? That's how much weight you're potentially saving by weighing the pain…

I know that glider maintenance procedures in my country call for redoing the center of gravity measurents after painting. Might have been related?

Re: Midair Collision over Denver

#156
post #62

Wow, that's incredible. Goes to show that people do walk away from plane crashes with some regularity. My father was a pilot[0]. He sold his plane about 15 years ago (to a group of owners, one of which was a priest, I'm sure there's a joke in there). A few of winters later, he was called out to Romeo Airport; the pilot flying the plane that was formerly his had crashed the aircraft a few miles short of the runway in…

There is a similar story in rally car safety. In the 80s and 90s going off the road at high speeds almost certainly meant death or serious injury.

By comparison, there are some horrific crashes today that drivers are walking away from. [1]

[1] https://youtu.be/YpNdoV6xv2s

Re: Midair Collision over Denver

#157
post #155

Earlier quoted context omitted.

> The weight is so critical that the 7-seat plane can realistically only seat 4-5 adults. I remember being shocked that they had to weigh the paint they applied when he had the plane re-painted. I used to work in general aviation. If my eyes could fly a loop in my skull they would have. Were the occupants required to use the bathroom before flying? That's how much weight you're potentially saving by weighing the pain…

I know that glider maintenance procedures in my country call for redoing the center of gravity measurents after painting. Might have been related?

In the US, the FAA requires recalculation of the weight and balance unless the change is "negligible", which AC 43.13-1B defines as "any change of one pound or less for aircraft whose weight empty is less than 5,000 pounds".

I think the commenter was making the point that the weight of the paint is not a significant consideration, not that recalculating the weight and balance after a paint job should not be done.

Re: Midair Collision over Denver

#158
post #62

Wow, that's incredible. Goes to show that people do walk away from plane crashes with some regularity. My father was a pilot[0]. He sold his plane about 15 years ago (to a group of owners, one of which was a priest, I'm sure there's a joke in there). A few of winters later, he was called out to Romeo Airport; the pilot flying the plane that was formerly his had crashed the aircraft a few miles short of the runway in…

> The weight is so critical that the 7-seat plane can realistically only seat 4-5 adults. I remember being shocked that they had to weigh the paint they applied when he had the plane re-painted. I used to work in general aviation. If my eyes could fly a loop in my skull they would have. Were the occupants required to use the bathroom before flying? That's how much weight you're potentially saving by weighing the pain…

I'm building an experimental, and we tend to re-do weight and balance after painting. An elaborate paint job can add 30+ pounds and can shift your CG rearward. The regs don't require it, but many builders do it anyway.

Re: Midair Collision over Denver

#159

No deaths nor injuries involved, which I feel like this should be in the headline. I came in expecting to see at least a commercial flight was involved (how does it make to #1 on HN otherwise?) but was very relieved to see it was two small aircrafts with 1 and 2 pilots respectively and everyone survived safely.

If there were two commercial passenger flights involved and it were 300 miles south, it would be life imitating art.

https://en.wikipedia.org/wiki/ABQ_(Breaking_Bad)#Plot

Re: Midair Collision over Denver

#160
post #48
post #45

Earlier quoted context omitted.

I believe the whole airplane needs to be replaced after BRS use.

> Cirrus originally thought that the airframe would be damaged beyond repair on ground-impact, but the first aircraft to deploy (N1223S) landed in mesquite and was not badly damaged. [1] [1] https://en.wikipedia.org/wiki/Cirrus_Airframe_Parachute_Syst...

they're almost always totaled by the insurance company. Easier than risking that they missed a hairline fracture somewhere and have the plane go down again.
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