Aeronautical Insanity: switching to secondary tolerances

The Something Awful Forums > Discussion > Automotive Insanity > Aeronautical Insanity: switching to secondary tolerances

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I would blow Dane Cook: Dec 26, 2008

hobbesmaster posted:

https://twitter.com/deltanewshub/status/1699420223407841751?s=46&t=TBi_iSImUmzjTxXAKsMEHw

I assume another thread on this forum is running through the jokes because there a lot

delta going to make a lot of changes to tire pressure soon.

# ? Sep 7, 2023 04:06

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# ? May 21, 2024 01:22

ImplicitAssembler: Jan 24, 2013

mobby_6kl posted:

https://i.imgur.com/bfKIUS0.mp4

Hate crimes.

Also the helicopter pilot lost his job. Not because he didn't anything wrong, but with no machine to fly, the company terminated his contract.

# ? Sep 7, 2023 05:43

Humphreys: Jan 26, 2013; We conceived a way to use my mother as a porn mule

Mate of mines knocking out pics from a current exercise:

# ? Sep 7, 2023 10:38

mustard_tiger: Nov 8, 2010

ImplicitAssembler posted:

Hate crimes.

Also the helicopter pilot lost his job. Not because he didn't anything wrong, but with no machine to fly, the company terminated his contract.

Probably saved his life though.

# ? Sep 7, 2023 21:03

HawkHill: Aug 15, 2015

Zero One posted:

https://www.youtube.com/watch?v=SxkA82wORtw

Nice but I liked James May's documentary about his U2 flight better.

I think that it has more info about the plane and the process and is less 'Jesus Oh My God We're ALL GOING TO DIE!"

https://www.youtube.com/watch?v=jtsZaDbxCgM

I wonder why James claims to have had a few days training rather than six months.

Six months sees excessive.

# ? Sep 8, 2023 03:14

Sagebrush: Feb 26, 2012

I know about the envelope in which the U-2 flies, but it's still fuckin bananas to see 103 KIAS and 0.7 Mach on the gauges :psyduck:

# ? Sep 8, 2023 03:42

I would blow Dane Cook: Dec 26, 2008

is that bad?

https://twitter.com/MichaelWestBiz/status/1699922379424891147

# ? Sep 8, 2023 15:52

MrYenko: Jun 18, 2012; #2 isn't ALWAYS bad...

I would blow Dane Cook posted:

is that bad?

https://twitter.com/MichaelWestBiz/status/1699922379424891147

Contract MX in the developing world is very much you-get-what-you-pay-for. (Which is to say the suit that makes the decisions got his bonus, and the suit in charge of line MX did not.)

Ours was done in Chile, and it was uniformly not amazing. Nothing that bad, though. A high-stage leak can absolutely start an engine fire. Shits hot, yo.

# ? Sep 8, 2023 16:02

Two Kings: Nov 1, 2004; Get the scientists working on the tube technology, immediately.

60 minutes or NPR or someone did an investigation about this years ago.

In theory the mechanics should just be following what the manuals tell them to do. However there were issues with whether the mechanics could read the manuals as they weren�t always translated into their native language. And there were issues with checking that their work was done properly.

# ? Sep 8, 2023 16:05

BalloonFish: Jun 30, 2013; Fun Shoe

I see 'aircraft maintenance', 'Middle East' and 'loose bolts' and can't help think of Round the Bend:

Neville Shute posted:

"Forty-five more prayers a day may seem a lot to you," he said in Arabic. "They did to Moses. Yet forty-five a day was the commandment of God, and God is All-Seeing, and All-Knowing and All-Merciful; He would not command that you should do more than you can perform. Men who work as you do upon aeroplanes can pray to God forty-five times a day quite easily, I will tell you how."

He straightened up upon the trestle and looked down on them, spanner in hand. He was wearing a soiled khaki shirt and khaki shorts; he wore old oil-stained shoes with socks rolled round about his ankles. Beads of sweat were making little glistening streaks upon his face in the heat of the hangar, and the shirt clung to his back in dark, wet patches. His hands and forearms were stained and streaked with oil from the engine, mixed with sweat.

"I inspect some of the work you do upon these engines and these aeroplanes," he said. "God, the All-Seeing and All-Knowing, he inspects it all. You come to me and say, 'I have replaced this manifold and the job is finished.' I come to look at it to see if there is any fault, and I see everything in place. I look at the nuts, and I see the locking wires correctly turned the right way to prevent the nuts unscrewing, and that is all that I can see. I cannot see if the nuts are screwed only finger tight; I cannot see if you have put a lever upon the spanner and strained them up so tight that the bolts are just about to fail tension. These things are hidden from me, but nothing is hidden from the All-Seeing Eye of God."

He paused, "God, the All-Knowing, knows if you have done well or ill," he said quietly. "If you ask Him humbly in prayer to tell you, He will tell you if you have done well or ill; in that way you have a chance to do the job again, and try to do it better. Or you can come to me and say, Help me do this work, because I cannot do it right. God is All-Merciful, and He will not hold bad work against you if He sees you striving to do right. So I say this to you."

He paused again. "With every piece of work you do, with every nut you tighten down, with every filter that you clean or every tappet that you set, pause at each stage and turn to Mecca, and fold your hands, and humbly ask the All-Seeing God to put into your heart the knowledge whether the work that you have done has been good or ill. Then you are to stand for half a minute with your eyes cast down, thinking of God and of the job, and God will put into your heart the knowledge of good or ill. So if the work is good you may proceed in peace, and if it is ill you may do it over again, or come to me and I will help you to do well before God."

He turned back to the engine. "If you do this," he said, "you will soon find that you are praying to God forty-five times a day or more, as He directed to the Prophet in the first instance."

# ? Sep 8, 2023 16:31

I would blow Dane Cook: Dec 26, 2008

https://twitter.com/MichaelWestBiz/status/1700026845998268617

# ? Sep 8, 2023 16:43

Nebakenezzer: Sep 13, 2005; The Mote in God's Eye

Platystemon posted:

I can�t believe that the gender fluid did this.

many such stories

# ? Sep 8, 2023 20:34

slidebite: Nov 6, 2005; Good egg

I think there was a Mentour pilot episode on a embraer that had some cut rate maintenance done in portugal or spain and it was inches from disaster. Like controls got reversed or something that made the AC almost impossible to control.

# ? Sep 8, 2023 22:40

Syncopated: Oct 21, 2010

slidebite posted:

I think there was a Mentour pilot episode on a embraer that had some cut rate maintenance done in portugal or spain and it was inches from disaster. Like controls got reversed or something that made the AC almost impossible to control.

drat, not the air condition...

# ? Sep 8, 2023 23:19

Mokotow: Apr 16, 2012

slidebite posted:

I think there was a Mentour pilot episode on a embraer that had some cut rate maintenance done in portugal or spain and it was inches from disaster. Like controls got reversed or something that made the AC almost impossible to control.

https://en.wikipedia.org/wiki/Air_Astana_Flight_1388?wprov=sfti1

Crazy ATC recording on YT. Amazing they made it.

# ? Sep 8, 2023 23:22

stan488: Mar 18, 2005

slidebite posted:

I think there was a Mentour pilot episode on a embraer that had some cut rate maintenance done in portugal or spain and it was inches from disaster. Like controls got reversed or something that made the AC almost impossible to control.

The service bulletin for replacing the aileron cable supports has a ton of giant warnings in it to make sure you don't cross the cables. Its very easy to get them crossed when running them, but in the US at least its an RII task (critical task in EASA land) so you will have at least one if not two inspectors uninvolved in the job look it over and one of the operational tests after rerigging the ailerons is to watch and make sure they move in the correct direction that is commanded.

There were a ton of places the error should have been caught but wasn't.

When I was working heavy maintenance we picked up work on an ACMI carriers 747s after one of their planes left a repair facility in China and on its flight back to the US ended up with 50+ write ups and they ended up pulling their contract with that facility.

# ? Sep 9, 2023 02:25

SeaborneClink: Aug 27, 2010; MAWP... MAWP!

stan488 posted:

The service bulletin for replacing the aileron cable supports has a ton of giant warnings in it to make sure you don't cross the cables. Its very easy to get them crossed when running them, but in the US at least its an RII task (critical task in EASA land) so you will have at least one if not two inspectors uninvolved in the job look it over and one of the operational tests after rerigging the ailerons is to watch and make sure they move in the correct direction that is commanded.

There were a ton of places the error should have been caught but wasn't.

When I was working heavy maintenance we picked up work on an ACMI carriers 747s after one of their planes left a repair facility in China and on its flight back to the US ended up with 50+ write ups and they ended up pulling their contract with that facility.

The list seems shorter at that point to document what *was* done correctly.

# ? Sep 9, 2023 03:34

BIG HEADLINE: Jun 13, 2006; "Stand back, Ottawan ruffian, or face my lumens!"

at that last-minute microburst: https://www.youtube.com/watch?v=CNfA_USPffo

# ? Sep 9, 2023 22:27

Wingnut Ninja: Jan 11, 2003; Mostly Harmless

Good choice on the go-around.

# ? Sep 9, 2023 22:49

mllaneza: Apr 28, 2007; Veteran, Bermuda Triangle Expeditionary Force, 1993-1952

Wingnut Ninja posted:

Good choice on the go-around.

Come for the go-around, stay for the fire drop footage.

# ? Sep 10, 2023 06:35

azflyboy: Nov 9, 2005

There was another E-175 that had a flight control fuckup, compounded by the captain being dumb.

It was on a Republic Airlines flight that initially had the CA pitch trim written up for working intermittently (which was due to frayed wires), and halfway through the process of replacing the switch, maintenance decided to save some time and defer it, which left the switch in place, but instructed the captain not to use it.

Unfortunately, when they put the switch back in, it was installed upside down, never had a functional check, and the captain didn't realize this, so he attempted to use the trim switch on the next leg he flew, which is basically muscle memory.

This lead to the airplane nearly stalling on several occasions (the CA would hand control to the FO, who got the airplane settled down, then all hell broke loose when the CA took control back) until the crew figured out the pattern and got the airplane back on the ground.

As a result, the E-series can't have the yoke trim switches MEL'ed any more, and there's a mandatory service bulletin that makes it impossible to install said trim switches upside down.

# ? Sep 10, 2023 07:11

Mokotow: Apr 16, 2012

I�m no engineer but having it possible to install any part in a modern airliner upside down seems like an oversight.

# ? Sep 10, 2023 09:03

Cactus Ghost: Dec 20, 2003; you can actually inflate your scrote pretty safely with sterile saline, syringes, needles, and aseptic technique. its a niche kink iirc

the saline just slowly gets absorbed into your blood but in the meantime you got a big round smooth distended nutsack

nothing is impossible if you set your mind to it

# ? Sep 10, 2023 09:14

vessbot: Jun 17, 2005; I don't like you because you're dangerous

azflyboy posted:

As a result, the E-series can't have the yoke trim switches MEL'ed any more,

As it always should have been, jfc

# ? Sep 10, 2023 12:14

Murgos: Oct 21, 2010

Mokotow posted:

I�m no engineer but having it possible to install any part in a modern airliner upside down seems like an oversight.

In space craft and military aircraft, so I assume it holds true as a best practice generally, there are frequently requirements to have the mating be either unique or keyed such that you can�t put the wrong part in the wrong place.

Sometimes when that�s not practical you put the requirement on the wiring harness to be such that it�s pretty clear something�s wrong like the red wire is going to the yellow terminal when everything else lined up by color.

So, yeah, some kind of oversight. I could see how this practice would give the installer a false confidence that things were correct as long as it fit and then not checking.

Then again I�ve seen people force things in wrong because they just thought it was being problematic.

Murgos fucked around with this message at 13:52 on Sep 10, 2023

# ? Sep 10, 2023 13:46

babyeatingpsychopath: Oct 28, 2000; Forum Veteran

Mokotow posted:

I�m no engineer but having it possible to install any part in a modern airliner upside down seems like an oversight.

Different carriers have different opinions about which way light switches turn on (forward=on/down=on/etc.). So it's possible to see an American A320 with all the light switches installed the opposite direction of a Delta A320.

This leads to hilarious things where 737s bought from a different carrier are set up differently than yours, so you gotta figure out which tail you're sitting in to figure out which direction to flip the switch.

This also means that almost all toggle switches can be easily installed in one of two directions. Yoke trim switches shouldn't be of this kind, but a pedestal trim switch would be. It would also turn a pedestal trim switch from a normal R&R job into an RII job; that is, it is REQUIRED to have a second person inspect the installation and verify the job is correct.

# ? Sep 10, 2023 15:35

Rip Testes: Jan 29, 2004; I never forget a face, but in your case I'll be glad to make an exception.

Zero One posted:

https://www.youtube.com/watch?v=SxkA82wORtw

Any photographers please weigh in but half those photos seem so over processed to the point of looking like CGI. Why the need to leave the ground to make images like that?

# ? Sep 10, 2023 15:41

Phanatic: Mar 13, 2007; Please don't forget that I am an extremely racist idiot who also has terrible opinions about the Culture series.

azflyboy posted:

There was another E-175 that had a flight control fuckup, compounded by the captain being dumb.

The very first V-22 incident, where the plane rolled over while hovering, was because the flight controls were wired backwards.

https://www.youtube.com/watch?v=VYeLishJ_Js

# ? Sep 10, 2023 16:22

Cojawfee: May 31, 2006; I think the US is dumb for not using Celsius

Rip Testes posted:

Any photographers please weigh in but half those photos seem so over processed to the point of looking like CGI. Why the need to leave the ground to make images like that?

All of the other photos he shows in the video are also massively over produced, so maybe that's just how he edits his pictures. I think he said that the air force asked him to do the project, so maybe that's what they wanted. Would be nice to see how the photos actually looked though.

# ? Sep 10, 2023 16:27

azflyboy: Nov 9, 2005

vessbot posted:

As it always should have been, jfc

Being able to MEL one yoke trim switch would actually be perfectly safe (there's a backup trim switch on the center console, and the one on the other yoke), so what they may have done is just changed the MEL procedure so maintenance can't just placard the switch, and now has to pull a breaker and/or physically disconnect the bad trim switch so it doesn't do anything.

# ? Sep 10, 2023 18:48

Fornax Disaster: Apr 11, 2005; If you need me I'll be in Holodeck Four.

A lot of Canadians who have dealt with Canada�s aviation industry lately must be experiencing schadenfreude right now. The Prime Minister is stuck in India because his airplane is having technical difficulties.

https://www.cbc.ca/news/world/g20-communique-russia-trudeau-1.6962198

cbc posted:

The prime minister's trip took a turn Sunday when his office announced the delegation's plane � the Canadian Armed Forces-managed CFC001 � is experiencing "technical issues" and will not leave as scheduled tonight.

"These issues are not fixable overnight, our delegation will be staying in India until alternate arrangements are made," said PMO spokesperson Mohammad Hussain in a statement to reporters.

I�m not seeing anything saying what specifically went wrong. The airplane is the VIP configured CC-150 Polaris. This is the same aircraft that the maintenance contractor damaged a few years ago when it rolled away from them into a tow tractor and a hanger wall. The Polaris are converted A310s that originally flew for Wardair.

# ? Sep 10, 2023 23:50

Lord Stimperor: Jun 13, 2018; I'm a lovable meme.

babyeatingpsychopath posted:

Different carriers have different opinions about which way light switches turn on (forward=on/down=on/etc.). So it's possible to see an American A320 with all the light switches installed the opposite direction of a Delta A320.

This leads to hilarious things where 737s bought from a different carrier are set up differently than yours, so you gotta figure out which tail you're sitting in to figure out which direction to flip the switch.

This also means that almost all toggle switches can be easily installed in one of two directions. Yoke trim switches shouldn't be of this kind, but a pedestal trim switch would be. It would also turn a pedestal trim switch from a normal R&R job into an RII job; that is, it is REQUIRED to have a second person inspect the installation and verify the job is correct.

Yeah, there was an airliner in Brazil or Colombia that crashed at night because their airplanes all had different switch configurations. So when an instrument (I believe it was the adi?) had a sporadic error, they wanted to switch to the good one. But because of the reversed switching they selected the broken one and death spiralled into the jungle.

# ? Sep 10, 2023 23:59

bonelessdongs: Jul 17, 2019

BIG HEADLINE posted:

Oh, this sounds like a bad idea: https://newatlas.com/aircraft/atrx-700-light-sport-helicopter-faa-rule-change/

quote:

A two-seater, the ATRX-700 does not require a medical certificate to fly and anyone with a driver�s license can be trained at the maker's factory or by a Certified Flight Instructor (CFI) certified for the copter at a much lower cost than traditional helicopter instruction. In addition, it only requires 30 hours of flight training.

# ? Sep 11, 2023 00:27

Platystemon: Feb 13, 2012; BREADS

bonelessdongs posted:

Coming Soon to Helicopters!

# ? Sep 11, 2023 00:36

bonelessdongs: Jul 17, 2019

Good news for the simple folk out there who need an affordable helicopter

# ? Sep 11, 2023 03:59

Triggerhappypilot: Nov 8, 2009; SVMS-01 UNION FLAG GREATEST MOBILE SUIT

ENACT = CHEAP EUROTRASH COPY

[EXT. - LOG CABIN IN MONTANA - DAY]

BEECHCRAFT BONANZA is chopping logs in front of his rustic cabin. BONANZA looks up at the sound of a car approaching. FAA INSPECTOR arrives in government limousine. He steps out, getting his shoe dirty with mud.

BONANZA:
You again? What did I do this time?

INSPECTOR:
You? You didn't do anything.

BONANZA continues chopping firewood.

BONANZA:
Well, that's a welcome change.

BONANZA eyes INSPECTOR suspiciously.

BONANZA:
So why come all the way out here?

INSPECTOR:
I needed an expert.

BONANZA:
You know I'm retired.

INSPECTOR:
Maybe so...

INSPECTOR retrieves a large file from his briefcase, slamming it down on tree trunk. A newspaper clipping flies out. BONANZA picks it up.

INSPECTOR:
...but you know what they say, don't you? It takes one to catch one.

Close up on Newspaper clipping. BONANZA reads headline aloud.

BONANZA:
"Light sport helicopter crash kills Doctor, Passenger..."

# ? Sep 11, 2023 05:06

Mr. Wiggles: Dec 1, 2003; We are all drinking from the highball glass of ideology.

Triggerhappypilot posted:

[EXT. - LOG CABIN IN MONTANA - DAY]

BEECHCRAFT BONANZA is chopping logs in front of his rustic cabin. BONANZA looks up at the sound of a car approaching. FAA INSPECTOR arrives in government limousine. He steps out, getting his shoe dirty with mud.

BONANZA:
You again? What did I do this time?

INSPECTOR:
You? You didn't do anything.

BONANZA continues chopping firewood.

BONANZA:
Well, that's a welcome change.

BONANZA eyes INSPECTOR suspiciously.

BONANZA:
So why come all the way out here?

INSPECTOR:
I needed an expert.

BONANZA:
You know I'm retired.

INSPECTOR:
Maybe so...

INSPECTOR retrieves a large file from his briefcase, slamming it down on tree trunk. A newspaper clipping flies out. BONANZA picks it up.

INSPECTOR:
...but you know what they say, don't you? It takes one to catch one.

Close up on Newspaper clipping. BONANZA reads headline aloud.

BONANZA:
"Light sport helicopter crash kills Doctor, Passenger..."