A helicopter essentially consists of 4 sections which are completely maintained / repaired, also separately, every 250 flying hours:
- The hydraulic system
- The mechanical system
- The electronic system
- The fuselage
Authorized methods up to now: cold water as well as 2 approved alkaline cleaning agents – cleaning by hand (larger surfaces partially with steam cleaner with cold water).
The hydraulic system: soiled with oils, greases and sand. Very complex placements with many lines and heavily accessible.
- The electronic system: here was only cleaned in the area of the wires
- The mechanical system: soiled with oils and sand
- The fuselage: soiled with everything that can hit on a helicopter.
- Cleaning with a temperature of 65° C.
Short declaration: The cleaned helicopters are 40 year old transport helicopters. L=18m H=4m B=4m (without rotor) At the moment there still exist 23 pieces. All of them are used in Afghanistan (flight there and back in a Tupolev).