REFLECTOR: ALX-9524 Alternator

[Craig and Denise Woolston]

Bill-

  We have 650 hrs on our ALX-9524.  No major problems.  In the last ~200 hrs
the whine in the headsets has gotten louder when under full load (taxi
lights, landing lights, strobes, etc.) but goes away with electrical load.
We are running a MT 3 bladed so I don't think that's an issue.  Did you duct
an air blast tube into it?  The only other thing that comes to mind is we
run dual alternators so it's "normal" every day load is probably 30 amps.

Craig


-----Original Message-----
From: reflector-bounces at tvbf.org [mailto:reflector-bounces at tvbf.org] On
Behalf Of William Walker
Sent: Friday, October 14, 2011 2:31 PM
To: reflector at tvbf.org
Subject: REFLECTOR: ALX-9524 Alternator

Anybody having reliability issues with IO-550 alternators? My Kelly ALX-9524
lasts about a year between rebuilds by Aircraft Systems. This particular
engine/gear-driven alternator combination is proving to be quite annoying. I
would really like to make a fundamental change and have heard rumors of a
front-mounted, belt driven alternator conversion. Anybody have info on this?

According to AS and Bill Bainbridge at B&C Electronics, my 10:1 pistons, and
lightweight MT propeller in the pusher configuration are hammering the
alternator to death. 

I could possibly use a special starter adapter which mounts a pulley between
the engine and firewall to drive an alternator back there, but would rather
stay away from this idea due to the need for relocation of parts and
systems. 

If anyone has had good service past 250 hrs with their IO-550 gear-driven
alternator, please advise the brand and model number. 

My current unit is going to be turned into an industrial paperweight if it
continues to give me headaches.

Bill Walker
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