New prop, one less AD, and some great customer service from Hartzell

Ya don't really understand the incestuous relationship between the FAA and
the aircraft manufacturers, do ya?

Jim




If there has not been "any problems" with it why is there a repetitive
eddy current inspection on Hartzell prop hubs. ????

Inquiring minds and all....

Ben

On Oct 24, 7:31 am, " wrote:
On Oct 23, 6:27 pm, wrote:





: Congrats to Hartzell and Kevin for stepping up to the plane and
: accepting some responsibility for a marginal design of the hub. A
: very nobel act in this day and age..

: A "marginal design" that has worked without problems since the 70's.
: Certainly much more reliable than anything Lycoming, Cont., Cessna,
: King, etc have ever made.

: -Robert

Engineering (*especially in aviation*) is about making something as strong as necessary, but no stronger.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

If there has not been "any problems" with it why is there a repetitive
eddy current inspection on Hartzell prop hubs. ????

Because companies who have reliable products don't sell enough
products. Toss in the fact that the FAA will issue an AD almost
anytime a company asks for it you have your answer.

-Robert

In article .com,
"Robert M. Gary" wrote:

On Oct 24, 7:31 am, " wrote:
On Oct 23, 6:27 pm, wrote:





: Congrats to Hartzell and Kevin for stepping up to the plane and
: accepting some responsibility for a marginal design of the hub. A
: very nobel act in this day and age..

: A "marginal design" that has worked without problems since the 70's.
: Certainly much more reliable than anything Lycoming, Cont., Cessna,
: King, etc have ever made.

: -Robert

Engineering (*especially in aviation*) is about making something
as strong as necessary, but no stronger.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

If there has not been "any problems" with it why is there a repetitive
eddy current inspection on Hartzell prop hubs. ????

Because companies who have reliable products don't sell enough
products. Toss in the fact that the FAA will issue an AD almost
anytime a company asks for it you have your answer.

-Robert

That is especially true of Hartzell. One of their propellers requires an
"optical conformity check" to assure that the blases conform to Hartzell
specs. Only problem is that some owners submitted zero-time blades,
which failed the test!

The word is, "never ship your prop to Hartzell -- they will junk it and
sell you a new one."

On Oct 24, 10:36 am, "Robert M. Gary" wrote:
On Oct 24, 7:31 am, " wrote:





On Oct 23, 6:27 pm, wrote:

: Congrats to Hartzell and Kevin for stepping up to the plane and
: accepting some responsibility for a marginal design of the hub. A
: very nobel act in this day and age..

: A "marginal design" that has worked without problems since the 70's.
: Certainly much more reliable than anything Lycoming, Cont., Cessna,
: King, etc have ever made.

: -Robert

Engineering (*especially in aviation*) is about making something as strong as necessary, but no stronger.

-Cory

--

************************************************** ***********************
* Cory Papenfuss, Ph.D., PPSEL-IA *
* Electrical Engineering *
* Virginia Polytechnic Institute and State University *
************************************************** ***********************

If there has not been "any problems" with it why is there a repetitive
eddy current inspection on Hartzell prop hubs. ????

Because companies who have reliable products don't sell enough
products. Toss in the fact that the FAA will issue an AD almost
anytime a company asks for it you have your answer.

-Robert- Hide quoted text -

- Show quoted text -

Ya, I kinda thought about that just as I hit the send key. I have
owned a few certified planes and most of the AD's I had to comply with
made me just shake my head in disbelief. Thats why I have an
experimental homebuilt now. I NEVER want to see a yellow tag again
either. I have had a few "yellowtagged" components try to kill me....

Ben

I had my MT composite prop overhauled this year. The hub needed some
machining, but if the blades are damaged they are replaced. The leading edge
is nickel, but the rest is wood laminate for weight.

They do not do well in rain, since it chips the paint off of the wood.