Made firewall doublers

January 28, 2014 – I drilled up the doublers that go onto the firewall. They are the F-601Z Aux Fuel Pump doubler and the F-601TD Brake doubler.

I misread the instructions on the TD doubler, so the attach rivets will be -4s instead of -3s. That’s all I’m going to say about that.

I also clecoed the firewall recess in place and back-drilled those holes to full size.

Next thing is to back-drill all the firewall fasteners to full-size.

Time: 1:10