6 ms·

IIRC every bolt's torque value needs to be logged any time it's (re)fastened. At least that's true for aircraft engine maintenance, not sure if it applies to th

by jupp0r 3y ago

IIRC every bolt's torque value needs to be logged any time it's (re)fastened. At least that's true for aircraft engine maintenance, not sure if it applies to the assembly process of the airframe, I'd sure hope so!

SketchySeaBeast 3y ago
Man, if that's not automated how do they keep the numbers from being fudged? That's a lot of bolts, isn't it?
- avn2109 3y ago
  Most of the fasteners on the airframe are probably not bolts, e.g. rivets on aluminum airframes. But yes it's surely still a lot of bolts.
- kube-system 3y ago
  I'm not sure what the standard is in the aviation industry, but things like data-logging torque wrenches exist, and are used in other industrial applications.
- gafferongames 3y ago
  They should put the bolt torque values on the blockchain. That'll fix it.
sparky_z 3y ago
Which doesn't rule out, say, a design flaw that allows the bolt to loosen over time under certain circumstances.
- ryandrake 3y ago
  That's why we have safety wire, which is all over aviation construction.
- spaceywilly 3y ago
  The Max 9 has been in service since 2018 though, I think if it was a design issue it would have occurred before now. This seems like a Manufacturing QA “escape” to me. Some bolt was either not installed properly or not tightened to the proper spec, QA did not catch it
  - lmm 3y ago
    > The Max 9 has been in service since 2018 though, I think if it was a design issue it would have occurred before now. That's a bit of a leap. If the bolts are e.g. too soft and have worn out in use, that would be a design issue that would only show up after a period of use.
lostlogin 3y ago
> IIRC every bolt's torque value needs to be logged any time it's (re)fastened. So how did this happen if they we checked so recently?
- cpncrunch 3y ago
  Most likely they were either not installed properly in the first place, or there is some kind of design flaw.
- iancmceachern 3y ago
  Process issues

by jupp0r 3y ago

SketchySeaBeast 3y ago

Man, if that's not automated how do they keep the numbers from being fudged? That's a lot of bolts, isn't it?

avn2109 3y ago
Most of the fasteners on the airframe are probably not bolts, e.g. rivets on aluminum airframes. But yes it's surely still a lot of bolts.
kube-system 3y ago
I'm not sure what the standard is in the aviation industry, but things like data-logging torque wrenches exist, and are used in other industrial applications.
gafferongames 3y ago
They should put the bolt torque values on the blockchain. That'll fix it.

sparky_z 3y ago

Which doesn't rule out, say, a design flaw that allows the bolt to loosen over time under certain circumstances.

ryandrake 3y ago
That's why we have safety wire, which is all over aviation construction.
spaceywilly 3y ago
The Max 9 has been in service since 2018 though, I think if it was a design issue it would have occurred before now. This seems like a Manufacturing QA “escape” to me. Some bolt was either not installed properly or not tightened to the proper spec, QA did not catch it
- lmm 3y ago
  > The Max 9 has been in service since 2018 though, I think if it was a design issue it would have occurred before now. That's a bit of a leap. If the bolts are e.g. too soft and have worn out in use, that would be a design issue that would only show up after a period of use.

lostlogin 3y ago

> IIRC every bolt's torque value needs to be logged any time it's (re)fastened. So how did this happen if they we checked so recently?

cpncrunch 3y ago
Most likely they were either not installed properly in the first place, or there is some kind of design flaw.
iancmceachern 3y ago
Process issues