AUTO – In-flight –

• The left recirculation fan operates if both packs are operating unless either PACK Switch is in HIGH
• The right recirculation fan operates if both packs are
• operating unless both PACK Switches are in HIGH.

– On the ground –

• The left recirculation fan operates unless both PACK Switches are in HIGH
• The right recirculation fan operates even if both PACK Switches are in HIGH.