[TowerTalk] G-1000DXA failure with lower mast clamp

[dotravel at aol.com]

Another consideration would be to properly torque the bolts based on the materials involved. Too lose and they can work their way out and if too tight they are prone to stripping.   

Regards, John NA6L  



-----Original Message-----
From: Barry N1EU <n1eu.barry at gmail.com>
To: towertalk <towertalk at contesting.com>
Sent: Tue, Dec 27, 2011 6:16 am
Subject: [TowerTalk] G-1000DXA failure with lower mast clamp


My G-1000DXA rotor came completely unhinged from its GC-038 lower mast
lamp and left my 3-el Steppir and attached rotor dangling from the
ttached cables.  It appears that the attachment bolts on the bottom
f the rotor came loose and fell out.  Please see photo at
ttp://n1eu.com/g1000.jpg
The cast aluminum fractured at one of the four threaded holes on the
otor bottom.  At first I thought this might be the cause of failure
ut on further thought, I would guess that the other 3 bolts came
oose and fell away and this fourth bolt was the last to stay attached
nd this caused the aluminum fracture.  Any comments on whether this
eems correct?
I'd also appreciate comments on why this happened in the first place
nd how to prevent a repeat.  The rotor was assembled to factory
nstructions with lock washers.  Instead of using anti-seize on those
our bolts, perhaps what is really needed is loctite?
Does the motor casing need replacement and if so, is this a fairly
asy job to do myself?  There's still about half the threads on the
ne hole that suffered the fracture.
Thanks & Happy Holidays,
arry N1EU
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