Metal encased LRU on Aircraft

[Danial9874]

Hi guys just curious
what type of metal is use to encase LRU ?
why must metal be use to encase LRU
is the function of the metal to Ground the LRU ?

[sph33r]

Is said LRU susceptible to interference? Could it be a Faraday cage of sorts? Wild guess based on info given mate....

[Ultranomad]

Depending on what's inside, it could be just plain aluminium alloy (in most cases), or an alloy with high magnetic permeability such as permalloy.