Door window frame moving in flight

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7133
Posts: 26
Joined: Tue May 01, 2018 7:00 am
Name: Michael Sheppard
Location: Watts Bridge Memorial Airfield
Aircraft Type: 1948 Cessna 140
Occupation-Interests: Mechanical and Structural Designer.
Contact:
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Door window frame moving in flight

Post by 7133 »

My door frames seal pretty well when I am on the ground, however the top rear part of window frame moves out during flight and I can see a gap there. I am guessing this can only be from pressure inside the cabin or negative pressure outside. Any ideas on which? Has anyone done anything to stop this happening?
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6643
Posts: 2484
Joined: Tue May 01, 2018 7:00 am
Name: John C
Location: KLCI, NH
Aircraft Type: 1946 C140/C90
Occupation-Interests: A&P, semi-retired
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Re: Door window frame moving in flight

Post by 6643 »

Look on the inside skin of the door right around the door lock area for cracks. Cracks here allow the door to flex lengthwise. (Even if crack free they still tend to open in the top rear corner in flight.)
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7133
Posts: 26
Joined: Tue May 01, 2018 7:00 am
Name: Michael Sheppard
Location: Watts Bridge Memorial Airfield
Aircraft Type: 1948 Cessna 140
Occupation-Interests: Mechanical and Structural Designer.
Contact:
Contact 7133

Re: Door window frame moving in flight

Post by 7133 »

Thanks for your reply John.
I have strengthened around a crack on the pilots side, the passenger side is OK.
I realise they are weak in that corner but was wondering what actually causes the movement
Cheers
Michael
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