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F-35 pilot held 50-minute airborne conference call with engineers before crash

cnn.com

191–200 of 440 posts

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#191

Earlier quoted context omitted.

Quoting ChatGPT (and after a quick sanity check), The F-35 Joint Strike Fighter uses a specialized hydraulic fluid that’s based on a synthetic ester formulation, not a petroleum-based fluid. Specifically, it uses phosphate ester–based fire-resistant hydraulic fluid (commonly in the MIL-PRF-83282 or newer MIL-PRF-87257 class). Apparently the older phosphate-ester based hydraulic fluids were hygroscopic but I'm not sur…

Yes, lets condition people to never reveal they used ChatGPT. Even though the response seems accurate. [1] https://hiigroupasia.com/f-35-aviation-ground-support-equipm...

Yeh the sanity check involved researching the milspecs listed and the connection to the F35 program.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#192
post #41

F-35 is a boondoggle. $200M for one fighter plane is insane. If the USA ever had to go to war with this weapon, a huge number of them would be offline at any given time, and every single airframe loss would cause a huge dent in overall combat power. I don’t understand why our military and political leaders keep trying to buy ridiculously overpriced Swiss Army knife weapons (lots of flexibility but great at nothing) i…

The Air Force's F-35A variant has an "average" flyaway cost of $82.5 million for the jet's 15th, 16th and 17th production lots. https://breakingdefense.com/2023/10/newest-f-35-f-15ex-contr... The F-35 base model is around $80 million, rising to the highest known price of $109 million per unit for the F-35B vertical takeoff and landing variant. And then there's this: "The flyaway cost for the F-15EX Eagle II is approx…

F-35 is both the cheapest and most effective vehicle we have access to.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#193

> The temperature at the time of the crash was -1 degree Fahrenheit, the report said. That's ground temperature (also balmy, for Alaska). It starts getting colder, pretty quickly, once you're in the air. Hope they figure this out quickly, before someone ends up dead.

Dude, that’s a killing machine, someone will always end up dead.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#194
post #178

Earlier quoted context omitted.

For me, that was a moment when I realized that the received wisdom about military things can be just completely wrong. I had considered myself to be reasonably informed about the F-35, and how "everyone knows" it's a boondoggle. I think this started with a long-form article I read in 2013, "How the U.S. and Its Allies Got Stuck with the World’s Worst New Warplane": https://medium.com/war-is-boring/fd-how-the-u-s-and-…

Do you have any reason to attribute this to the fact they were F-35s? For comparison, how many jets were lost during "shock and awe"? Israel operates with impunity in Iran all the time, often on the ground. I'm not sure the fact they used F-35s is actually relevant here but if you have a source on that it would be interesting to read. Given the state of Iran it is hard to imagine the same could not be achieved with a…

Read F-35: The Inside Story of the Lightning II. The book sets the record straight on a lot of these issues.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#195
post #139

Earlier quoted context omitted.

Likely contamination of ground handling equipment [1]. Unfortunately can happen. I wonder if the hydraulic fluid is hygroscopic or something? 1. https://www.pacaf.af.mil/Portals/6/documents/3_AIB%20Report....

But 1/3 volume? That’s a LOT of contamination.

Got to say the pictures of the hydraulic drum (and pump) in the DoD report are very confidence uninspiring.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#196

> But those attempts failed to recenter the nose wheel and resulted in both the left and right main landing gears freezing up and not being able to extend fully to attempt an actual landing. > At that point, the F-35’s sensors indicated it was on the ground and the jet’s computer systems transitioned to “automated ground-operation mode,” the report said. And there wasn't a way to override that? I get that "manual mod…

Potentially it happened so quickly the pilot had no way to respond before they lost control of the aircraft and had to hit the eject? Still you'd hope transitions between major operation modes could have some manual confirmation. Is there some essential reason the aircraft has to automatically transition to 'automated ground operation mode' when it thinks landing is complete? Could you not just expect the pilot to pu…

For airliners, it's critical for the aircraft to know when it's on the ground because it kicks on autobrakes, and unlocks the thrust reversers for landing.

I'm very curious what the reasons would be for a military aircraft

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#197

Earlier quoted context omitted.

For me, that was a moment when I realized that the received wisdom about military things can be just completely wrong. I had considered myself to be reasonably informed about the F-35, and how "everyone knows" it's a boondoggle. I think this started with a long-form article I read in 2013, "How the U.S. and Its Allies Got Stuck with the World’s Worst New Warplane": https://medium.com/war-is-boring/fd-how-the-u-s-and-…

Quick googling shows that the Internet is succumbing to the propaganda machines. MSN mindlessly reproduces Iranian article about 2 shot down F-35s but I was unable to find any credible source to confirm that.

One of the crashed ones was larger than Antonov An-225 Mriya and was surrounded by people larger than 2 storey house.

The other had wings backwards, didn't look like f35 and had engine still running after crashing into pieces.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#198
post #93

Earlier quoted context omitted.

Airbus is fully fly-by-wire. Without some kind of computer intervention, nothing would be stopping an accidental bang against the flight stick from causing a maneuver violent enough to rip the wings off. An Airbus can operate in three modes. With Normal Law, the airplane will refuse to do anything which will stop it from flying. This means the pilot cannot stall the airplane, for example: the computer will automatica…

How does a pilot switch between the three modes? Just switches on the dash?

As I understand it, there are no switches because pilots aren't supposed to switch modes, but if necessary, pulling certain circuit breakers will disable subsystems whose failure triggers alternate law. And AFAIU it is documented which breakers are "least unsafe" to use that way.

Re: F-35 pilot held 50-minute airborne conference call with engineers before crash

#200

Earlier quoted context omitted.

I don't think there was ever a risk of the plane crashing with the pilot still in the cockpit, despite the fact that the headline sort of leads people to that conclusion. The pilot could eject at any time. Still dangerous, but more of a debugging session to avoid other similar costly in the future than a Hollywood-like "if we don't solve this now the pilot dies"

Ejections are pretty rough, and occasionally career or even life ending. So there would be a lot of pressure on the engineers to try to avoid it. Plus, this plane is very expensive. The cost is multiple times the average lifetime earnings of a typical person. It's not entirely wrong to say that they were attempting to save the life's work of multiple people.

Also the now-pilotless aircraft could potentally kill people on the ground when it crashes. If this had happened in a more populated area it very likely would have.
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