Fuselage inspection in external doubler installation
Fuselage inspection in external doubler installation
(OP)
Hi all,
I’m working in the installation of a external doubler on a pressurized fuselage (for an antenna installation). I have suddenly realized today, in the installation drawing, that the doubler is covering partially four existing rivets (between stringers and skin).
So the result is that, there are four rivets which head is partially hidden by the doubler (about 50%) and not possible to do a fully visual inspection on them.
Does anybody know if this installation is acceptable and it could be enough to include these four rivets in the ultrasounds/Eddy current inspection planned for the doubler fasteners and antenna hole? (this inspection is issued from the damage tolerance analysis).
Or it should be necessary to trim the doubler flange in order to keep clear an visible the rivets heads?
Thanks in advance
I’m working in the installation of a external doubler on a pressurized fuselage (for an antenna installation). I have suddenly realized today, in the installation drawing, that the doubler is covering partially four existing rivets (between stringers and skin).
So the result is that, there are four rivets which head is partially hidden by the doubler (about 50%) and not possible to do a fully visual inspection on them.
Does anybody know if this installation is acceptable and it could be enough to include these four rivets in the ultrasounds/Eddy current inspection planned for the doubler fasteners and antenna hole? (this inspection is issued from the damage tolerance analysis).
Or it should be necessary to trim the doubler flange in order to keep clear an visible the rivets heads?
Thanks in advance





RE: Fuselage inspection in external doubler installation
I assume that the SDI will find damage in the 2nd layer, so that the hidden portions of the holes can be inspected through the doubler. If you think that it's acceptable, your CVE/DER/DRE thinks it's acceptable, your regulatory body thinks it's acceptable, and the client thinks it's acceptable, then yes, it's acceptable. It sounds like the way to go to me. Uncomplicated to substantiate, straight-forward to implement, routine(ish) to perform.
RE: Fuselage inspection in external doubler installation
STF
RE: Fuselage inspection in external doubler installation
Thanks again for your help.
FJ
RE: Fuselage inspection in external doubler installation
if you want to inspect the buried rivets then you have to prove your inspection works ... a lot of work.
btw, you'll also need to inspect the fuselage under the dblr in any case ...
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