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From: DAP AERO <craig@dapaero.com>
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Date: Wed, 10 Jul 2024 14:57:16 -0700
Subject: P2004 master fuse
Message-Id: <C61F0E9B-AE75-4398-92E5-20E6AB3B9FC9@dapaero.com>
To: technical.support@tecnam.com

Hello, I have a P2004 SN 105 that has a 100 amp fuse on the positive lead of=
 the battery ( on a MTA fuse holder attached to the battery box).=20
The fuse is not shown in the POH or any other document.=20

Recently this fuse blew, which is the first time it has done anything in 150=
0 hours.  It blew 1 or 2 seconds into cranking.=20

diagnostics did not identify unusual so the fuse was replaced with an 80 amp=
 for additional testing. The aircraft was started a number of times with no i=
ssues on the 80 amp fuse .  For a more severe test, I also cranked for sever=
al seconds with the rails turned off so the engine would not start and the f=
use was fine.=20

I called a number of places including previous tecnam dealers, and nobody kn=
ows what to make of this fuse.=20

Was this factory installed? It is an Italian fuse holder so very uncommon he=
re in the states.=20
If installed by tecnam, what is the proper fuse?
What are the diagnostic and replacement procedures?

I can send a photo of the fuse block if necessary.=20

Regards
Craig=