2 thoughts on “13.5.2020 Automatic Alternate Air Door

  1. Engine n00b here, so excuse my ignorance – how is that automatic? Does the suction from the engine create enough pressure difference to open that door if the main inlet is blocked? If so, how did you calculate/measure the force required on that hinge?

    • supik / 15:21

      That’s correct, suction will open the door. We copied that system from another engine (Avia M337). Ground tests will have to be performed to verify proper operation/opening before flight. Door spring can be easily relocated with 2 new holes in door to increase/decrease spring force.

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