Assigned service life of a product operated for critical purposes affecting flight safety 150,000 switchings with an inductive load of up to 0.1 A with a time constant t ≤ 0.008 s, 25,000 switchings at an inductive load of 0.1 to 3 A with a time constant t ≤ 0.008 s during the assigned service life of 8 years, with a periodic check of the technical condition at each major overhaul of the facility. Shelf life in warehouses is 2 years. 
 
The resource of the product, operated according to its technical condition, before the first check, is not less than 3000 flight hours during the service life of not less than 6 years. Shelf life in warehouses is 2 years.