Hartzell Prop - AD - Christen Eagle

[Roger Miller]

I just sent my prop off for a routine rebuild, and was told that my HUB (S/N AU8593A), which was installed in the plane in 1997 is subject to an AD (2006-18-15) that states that all hubs with an A suffix and/or no suffix must be retired and I need to buy a new one to the tune of $3k (for the hub alone).

 

Anybody have any words of wisdom on this issue?

 

Roger Miller
Director Capital Project
Management Studio
Wald Ruhnke & Dost Architects, LLP
2340 Garden Road
Monterey, CA 93940
831-649-4642
Fax 831-649-3530
Cell 831-521-9360

 

[Ron Renz]

Read the AD very very carefully. It is very easy to miss read it.  Many pitfalls.

 

Have your p/n and s/n and dash number etc. handy when you read it.  Follow it carefully.

 

If you want help interpretting it,  please feel free to call me.

   ___
   o|o
---( )---

Ron Renz
GUT Works, LLC
(785) 312-9880 (office 1)
(785) 749-0900 (office 2)
(785) 749-0988 (fax)
re...@gut-works.com (email)
www.gut-works.com

 

---

[john]

Roger ,
I think the latest AD from hartzell is this one :
http://www.hartzellprop.com/product_support/sitelinks_prod_servdocs.htm

Although still not good news for you the reason for the AD is this has
been happening :
http://tony-crowe.fotopic.net/p26771272.html

I know several people who have had this expensive change - i was lucky

rgrds
John GCENC

On Nov 14, 11:00�pm, "Ron Renz" <r...@gut-works.com> wrote:
> Read the AD very very carefully. It is very easy to miss read it. �Many
> pitfalls.
>
> Have your p/n and s/n and dash number etc. handy when you read it. �Follow
> it carefully.
>
> If you want help interpretting it, �please feel free to call me.
>
> � �___
> � �o|o
> ---( )---
>
> Ron Renz
> GUT Works, LLC
> (785) 312-9880 (office 1)
> (785) 749-0900 (office 2)
> (785) 749-0988 (fax)

> r...@gut-works.com (email)www.gut-works.com
>
> � _____ �

[al]

What I read in AD 2006-18-15 is:

...Lycoming O-, IO-, LO-, and AEIO-360 series reciprocating engines.
This AD requires initial and repetitive eddy current inspections (ECI)
of the front cylinder half of the propeller hub for cracks and
removing cracked hubs from service before further flight. In addition,
this AD allows installation of an improved design propeller hub
(suffix SN "A" or "B") as terminating action to the repetitive
ECI. .....

So it looks to me that you can continue getting the ECI's until
overhaul time.

Later, in the "Hub Replacement" section they give a list of s/n's
included and excluded, but go on to state that the A suffix are only
good for 72 months or 1000 hours if used in aircraft certified in the
acrobatic category.

Being from Canada I'm not totally on top of your regulations, but
isn't the Eagle classified as uncertified in the US? Are you mandated
to have your prop overhauled? I can understand your prop shop not
wanting to overhaul one of these, but how about if they just checked
it and replaced whatever parts are required, and you continue on with
annual ECI's. My own propeller was changed to the B hub by the
previous owner, but looking through old paper trails I noted several
tags and invoices which stated something along the line of "this
repair does not constitute an overhaul".

Just a thought.

Al MacDonald

[Eagle N23TS]

This is the topic that keeps on giving. There is no need for
replacement of the hub. There is an inspection that is necessary.
The frequency and depth is dependent on your local prop shop. Print,
and re read all the ADs and SBs; and the 100 hour inspection option
will stand out. The B hub simply eliminates the need for 100 hour
inspection. The Boston MIDO resolved this issue in partnership with
Hartzell. The inspection is $150 to $300 a year. your prop is
important and the inspection can be done at most shops while you
wait. Specifically, fly in and wait 3 hours and fly home. Your back
plate is the real issue. I have replaced mine twice. The fix is a
good balance.

This issue confuses many and if one reads the ADs and chooses to
fixate on a line or two, one could quickly determine the more
conservative option of replacement. Add a little desire to justify a
new prop, and most accept the AD as direction to replace.

I am comfortable with inspections for $200 a year. This issue has
caused a lot of heated debates in our community and particularly among
owners and mechanics. Fortunately the FAA and the manufacture has a
resolution that is affordable and safe.


Brock
N23TS