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As a recently retired corporate pilot and former airline FAA licensed Flight Dispatcher on the Boeing 737 series aircraft, I know there are two settings for air conditioning and pressurization. Both settings control the air condition packs. ECON or Recirculation increases fuel efficiency by 3-5% by recirculating some of the cabin air thereby reducing the demand on the left and right AC packs and associated engine bleed air. The 100% setting produces fresh filtered air to the cabin. The down fall is increased fuel consumption (3-5%) by placing more demand on engine bleed air. However........in the current environment of COVID does Southwest operate the cabin AC/Pressurization in 100% fresh air or recirculated air? Maybe someone on this forum knows, before I contact Customer Support.
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@Steve1822 wrote:As a recently retired corporate pilot and former airline FAA licensed Flight Dispatcher on the Boeing 737 series aircraft, I know there are two settings for air conditioning and pressurization. Both settings control the air condition packs. ECON or Recirculation increases fuel efficiency by 3-5% by recirculating some of the cabin air thereby reducing the demand on the left and right AC packs and associated engine bleed air. The 100% setting produces fresh filtered air to the cabin. The down fall is increased fuel consumption (3-5%) by placing more demand on engine bleed air. However........in the current environment of COVID does Southwest operate the cabin AC/Pressurization in 100% fresh air or recirculated air? Maybe someone on this forum knows, before I contact Customer Support.
I don't have an answer to your question, and I doubt you'll get one from Southwest, but if it's helpful at all, Southwest does advertise, "full exchange of fresh outdoor air every 2-3 minutes while in flight."
You may have better luck asking on one of the pilots' forums online elsewhere.
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Thanks for reaching out, @Steve1822.
Prior to the COVID-19 pandemic, Southwest Airlines already followed the industry’s best practices for maintaining quality cabin air. Southwest’s Boeing 737s are equipped with HEPA filters that filter cabin air, and the on-board system effectively introduces fresh air into the cabin every few minutes. The HEPA air filters also remove 99.97% of airborne particles—similar to technology found in hospitals. Additionally, it is Southwest’s policy to operate with the cabin and flight deck air recirculation fans turned on at all times – both on the ground and during flight—which directs air through the HEPA filtration system and provides the greatest flow rate.
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