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Old 02-03-2020, 04:09 PM
  #10  
tomgoodman
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Joined APC: Feb 2006
Position: 767A (Ret)
Posts: 6,248
Default Turbocompressors

The B-707 used a turbocompressor for A/C (the small inlet above the cowl). It was driven by 16th stage bleed air, but provided outside air instead of bleed air to the cabin.

https://images.app.goo.gl/RXxmeprqwmwK2nYz9
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