Cabin draught

[maules.com]

Scoot
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The cabin is a low pressure area and is pulling air in especially the top left corner when looking back. Make a small plate fastened to the plywood with screws and the fastened to the strip of metal attached to the rear vertical tube structure. DO NOT drill into the frame tube or static line.
Then insulate the rear top of headliner to eliminate cold air being drawn forward. If you have a skylight, insulate the wing roots well and make sure the tape was replaced under wingroot fairing last annual.
Jeremy