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SB 505-21-0013 Air Conditioning Check valve and Muffler Modification (Optional)

(1) HISTORY
Embraer has identified opportunities to reduce cabin noise through changes described by this Service Bulletin.

This bulletin was issued to provide operators the instructions required to install modifications to the ram air line as an optional item.

(2) OBJECTIVE
To provide a redesigned check valve that will reduce cabin aircraft noise.

(3) EXPECTED BENEFITS
This modification is to provide a reduction in aircraft cabin noise.

(4) REVISION HISTORY
None.

At Customer's expense.