Understanding fuel servo maintenance

wrote:
On 19 Nov 2006 08:11:59 -0800, "Robert M. Gary"
wrote:
Not sure what you are looking for here, honestly. If you cannot
discuss this with the person/facility that did the repair, contact
another facility.

I guess I was hoping for smarter people here. Whenever I speak to
the fuel shops (or any A&Ps) all I get is "it was too rich, it needed
to be dialed down". My concern is still "why was it running on day 1
and didn't run day 2". I don't think the thing can "unadjust itself" in
one day. However, I'm not sure if changing out the spring is just a
'readjustment' or a fix for a problem. Sadly, none of the fuel shops I
spoke to even know how to answer that. I guess they're just in the mode
of correcting what they see wrong, not necessarily finding a root
cause. In my line of work we spend weeks in classes learning how to do
RCA (finding actual root causes of things, not just fixing the signs of
the problem). When I mention root cause I get blank looks from the fuel
techs or A&P. The best I get back is "install it and try it". However,
that means I need to put a certain number of hours on it before I feel
good about flying the family and the Boy Scouts. Also, each R&R is
costing me about 10 hours of A&P time.

-Robert


http://www.gnaircraft.com/access.htm

Just one company that has been working on them for a long time. Just
be sure you have a clearly defined question that you want an answer
to. I.E. if you know specifically what part was replaced, your
specific servo p/n and your symptoms prior to repair.

http://www.precisionairmotive.com/

Dig into this site for the list of product support & warrany repair
centers-I can't post a "link" to that page, but G & N is on the list.

I "understand" Bendix/RSA servos just fine, but have no idea what you
are asking, I've never repaired one. Maybe you need to talk to someone
who repairs them every day.

TC