Make sure that you can hear the flight deck conversation in the headphone.

Engines 1 and 2 supply hot air to their related wings.

Repair the surfaces that have scratches.

Before you do servicing of the hydraulic system, isolate it.

Make sure that you do not cut the control cable.

Do these two steps at the same time.

Put on goggles to prevent injury to your eyes.

Soak the element for four hours.

Rub the surface with a clean cloth.

If there is no contamination, start the operation again.

An incorrect connection will cause damage.