THE OFFICIAL PUBLICATION FOR BONANZA, BARON & TRAVEl ...

Answers are marked with initials of the staff or advisors
who answered it. NP-Neil Pobanz. AF-Arky Foulk. TT-Tom
Turner. AM-Arthur Miller. BR-Bob Ripley. BA-Bob Andrews. E-senes expert Lew Gage (LG)
and aVionics columnist John Collins (JC) also occasionally contribute answers.
Answers to technicol questions are the best information available based
on indications presented by the member asking the question. Actual
inspection of the airplane or system in question may change on initial
telephone or email suggestion. Aircraft owners. pilots and readers are
adVised to physically present airplanes ond indications to a qualified
mechanic before choosing a course of action.
have performed as perfect as the day it
rolled out of the factory. So I do not
want to try to improve something and
end up going backwards due to a lessthan-perfect
repair/reski nning.
A: I suggest you call Hampton (479-
394-5290), Biggs (405-258-2965) or
SRS (877-364-8003) and explain what
you have said to me to see what they
propose. - P
E-series engine conversion
Richard Willis
Plains, Georgia
Q: I have a 1947 35 (SIN 0-579)
and have been offered a gift of an E I 85,
on the table. How much trouble will it
be to modify it to an E228-8? I do not
know any information about it other
than it has been in storage for some time
and appears to be in fair shape. If I
accept the engine, can you recommend
an experienced hop for the conversion?
A: The engines are considerably different.
The crank is different, the carn is
different, the mounts are different. I recommend
you talk to Dave Allen at
Poplar Grove Airmotive (800-397-
8181) or Lew Gage (sunrisereno @
gmail.com; 775-826-7 184). - P
Oscililations in mp
Jeffrey Brown
Oklahoma City, Oklahoma
Q: On my 1984 B36TC (SfN EA-
416) I have about 900 hours on the factory
reman TSIO-520UB. We've experienced
oscillations in the manifold pressure
at cruise settings of about one inch.
Simply lubricating the wastegate controller
cured the problem in the past, but
it is now persistent. We have lublicated it
twice in the last even hours of flight. The
mp will drift down from 29 to 28 then
back up to 29 within about one second.
The mechanic found no evidence of play.
Any suggestions? Can safe flight be continued
in spite of the minor variations?
A : Besides the controller, lube the
shaft of the wastegate with Mouse Milk
(trade narne) available through Trimcraft
Aviation (800-558-9405). They only sell
to mechanics retail. There are probably
others that sell to owners, but I couldn't
find any at th is time. - P
Prop recommendation
Michael Goodman
New Brighton. Pennsylvania
Q: I am considering replacing the
prop on my 1960 M35 (SIN 0-6489).
It's the original 278-100-7 with about
3,800 IT and 800 TSO. One blade has
some slight play forward and aft but is
tight in either direction of rotation.
I have heard that many shops won't
overhaul them due to a lack of spare
parts and tech support. I have read all I
can find about two vs. three blades and
promotional information from various
propeller manufacturers. I bought the
Bonanza for its cruise performance. I
have a remanufacture 10-470-C with
300 hours on it and would like your
opi nion and prop recommendation.
A: I suggest you think about putting
a Hartzell on it. The availability of parts
and support as well as performance
would be satisfying. Your local prop
shop can help you choose which model.
I'd stay with two blades for speed. -NP
Prop questions
Travis Shields
Kimball. Tennessee
Q: I recently purchased a 1958 J35
(SIN D5673) and have learned a couple
of lessons. Although the annual was
signed off in the airframe log, the record
in the engine log only reflected a 100-
hour inspection and there was no entry
for the propeller. Also, there is a ding or
small indentation in the prop.
I am trying to bring the plane in
compliance and need to know if a Beech
propeller-model 278-204-21; Sf
7- 1243 with blade model 278-200-82
(blade SINs 5-08648 & 5-08665)-is
compatible with an 10-470-C engine
having SIN 87742-7-C-R. This engine
was installed in 1968 with the logbook
rating it as 250 hp, 2600 rpm and 8.0: I
compression ratio.
The propeller was in tailed in 1993.
The hub SIN appears to be 7-1243 (or 7-
1248) as seen on the actual hub. It was
installed by Aviation Enterprises. Inc. of
Gilbert, Arizona, with certificate number
ZU3R037M a. per a maintenance
release. I have called a prop shop and
searched the FAA and other websites but
haven't been able to find the answer on
my own. Any help or direction you can
provide would be greatly appreciated.
A: An annu al inspection is by definition
an inspection of the airframe.
Although there are many engine-related
items that need a look during an airframe
annual, there is no provision for
signing off an "annual" in an engine
logbook. Many A&Ps complete the
manufacturer-recommended lOO-hour
inspection checklist for the engine during
annual and endorse the engine log-