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John S,
As I understand it the Iskra starter causes the spring to drag on the
shaft and consequently the spring and shaft wear out very quickly.
It's impossible to know how much yours has been damaged without
removing it and having a qualified shop inspect it. Since that
involves major work (on a Legacy, engine has to be moved forward a few
inches in to get the starter adaptor off) I would probably just change
the starter and keep my fingers crossed if I were in your position.
But that's just my opinion and I'm not a aircraft engine mechanic.
Ron
On Mon, Jun 4, 2012 at 6:54 AM, John Smith <john@jjts.net.au> wrote:
Hi Ron,
No, it wasn't mine that was slipping but I'm on the case now to sort things
out before something fails.
I have a regular CMI starter adapter – incidentally, one that does not have
a part number the subject of the AD 2012-10-13 issued recently (this one
extended the applicability of the earlier AD on this subject to ALL engines
manufactured prior to Nov 2011 (not just in the period Jan 2011 to Nov
2011); but I do have an ISKRA starter.
I had been thinking of replacing the ISKRA unit with the SkyTec C24ST3 (the
lower duty of the two suited to the IO550 – being ..ST3 or ST5).
I noted your comments about the SkyTec unit "finishing the job"…. I'm just
wondering if that outcome might be related to the duff CMI starter adapters
the subject of this AD? In other words, whilst the ISKRA starter does
damage, certain starter adapters were doomed anyway?
My engine has about 50hours on it, and prob somewhere around 50 starts.
Whilst I like the light weight of the SkyTec ST3 unit (just over 6 lbs and
lower torque than the ST5, and my battery is in the back so SkyTec under
this circumstance recommend the ST3 anyway), appreciate any views around
whether the SkyTec is a good option or not, and whether I should be
overhauling the starter adapter?
Thanks!
Regards,
John
John N G Smith
Tel / fax: +61-8-9385-8891
Mobile: +61-409-372-975
Email: john@jjts.net.au
From: Ron Laughlin <ronlaughlin@gmail.com>
Reply-To: Lancair Mailing List <lml@lancaironline.net>
Date: Tuesday, 29 May 2012 1:17 AM
To: <lml@lancaironline.net>
Subject: [LML] Re: Legacy Starter/Starter Adapter
Hi john,
I believe it is your starter adaptor that is slipping. Mine produced the
same symptoms when it failed.
I think the Iskra starter damaged your starter adaptor and then the extra
torque provided by the Skytec starter finished the job. This has happened to
enough Cirrus owners that many shops now recommend a preemptive IRAN on the
starter adaptor when changing from an Iskra to one of the newer starters.
Ron
On May 26, 2012, at 2:34 PM, jpkleber@charter.net wrote:
Greetings,
I have been flying my Legacy for one year now and have accumulated 80 hours
flight time. My Legacy is equipped with a Continental IO-550-N engine.
At hour 70, I removed the ISKRA starter as a preemptive measure to preserve
the starter adapter. I replaced it with a SkyTec starter. All has been
well for the next 10 hours. However, now at 80 hours, it appears I am
getting starter slippage. While starting the engine, I'll get a couple
blades of rotation --- and then the prop will stop turning (at a
compression stroke), but it sounds as if the starter motor is continuing to
turn with full power. Stop cranking. Then resume, I'll get a few more
blades of rotation, and then the prop will stop turning, while the starter
motor continues with full power.
Is this what a failed starter adapter sounds like? Request advice on how to
proceed from other Legacy, ES, and IV, (equipped with Continental IO-550-N)
owner/builders who have had similar experience and successfully resolved the
issue.
Thank you,
John
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