System deactivation

[Danil]

I have noticed on the 737 MMEL/MEL on the "definitions", item 17, that along with de definition of the deactivated item there is a requirement for the operator to develop a procedure to deactivate a system.
"An acceptable method of securing or deactivating will be established by the operator"
So whatever the method would be it should be accepted by the CAA. Being a procedure it should be written in a manual therefore controlled by the quality department. Now, the procedure would vary along the world but as long as it has been accepted by CAA it will be OK (like ASFKAP company did)

Considering all the inputs you had I think the following would be the correct way to proceed with a deactivation:
-an entry should be made into the tech log. Most common procedure would be to describe de sys deactivated along with any MEL (O) procedures into a "Briefing Card" or something similar not in the DD.

• CB's pulled and guarded with color coded collars as chemical allii said (i did not now about the color code)
• Pilots informed through company communication system (pilots brief, pilot notices, company notams, etc)
• Leasor informed - if required

Thanks a lot,

Danil