3. Pressurization

3.1 General (article SG 6)

Pressurization, necessary to maintain the structure, must be ensured by :

• a normal wind tunnel ;

• a safety wind tunnel;

• a replacement blower (if required).

A replacement wind tunnel is required for continued operation in the event of failure of the normal wind tunnel.

Pressurization must be ensured by an air supply at least equal to natural leakage. This air supply is provided by two independent blowers: the normal blower and the safety blower.

Two blowers must always be in working order.

In the event of a shutdown of the normal blower, and in the...