Also please provide the following:

Game Version number:
Modded?: (Yes/No)
If modded, please list the mods:

In T184897#2676653, @Geez wrote:

Also please provide the following:

Game Version number:
Modded?: (Yes/No)
If modded, please list the mods:

My helicopter after a severe impact (usually front or lower, weapon damage can also be damaged just not as probable as impact) the instruments will most likely fail, I fixed everything but the instruments are still damaged. This problem exists in both the original and the mod.
Game Version is 1.2.0.124

Can you please explain what does mean that the instruments will fail?

In T184897#2676719, @Geez wrote:

Can you please explain what does mean that the instruments will fail?

All the instruments don't show the status of the helicopter in real time, such as speed, level, altitude and so on.