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are considerably more robust than the smaller (70 amp)
Prestolite alternators, but removal and inspection each
500 hours is a reasonable schedule. If you decide to
have your alternator rebuilt we have had good service
from Aircraft Systems in Rockford, Illinois (815-399-0225)
and Aircraft Electrical Components in Redding, California
(530-221-4397).
Flying under FAR 91, we are pri vileged to replace or
overhaul parts “on condition” if they are not restricted by
an Airworthiness Directive or a Continued Airworthiness
Limitation. The manufacturer’s suggested over haul/
replacement schedule is a good conservative guide with
a few exceptions, i.e. if the landing gear gearbox is not
leaking and has no excess clearance in the worm drive
I would not remove it for overhaul at 2,000 hours.
The landing gear and flap motors should be overhauled
on schedule, and I like to inspect or replace wing
bolts at 2,000-hour intervals.
There are many bushings in the nose gear steering,
gear doors, landing gear, cabin doors, flaps, etc. that
should be evaluated at each maintenance event to minimize
accumulated looseness and to keep the aircraft
“as delivered.” One of the items we are emphasizing
currently is a complete landing gear rod end change at
approximately 2,000 hours. —BA
Fuel flow
fluctuations
Chip Ridley
Danville, California
My B36TC has begun to ex perience a small fluctuation
Q. in fuel flow at all power settings. My JPI shows fuel
flow / .5 GPH, and on occasion I can feel the engine
pulsing. The #6 cylinder shows EGT fluctuat ing / 5
degrees. The other cylinders don’t appear to be fluctuating.
I got new spark plugs at my annual and recently adjusted
the high-power fuel flow setting. I would love any thoughts
since my A&P is struggling with this.
Normally when we see this problem, it is caused by
A. wear in the engine driven fuel pump, and is more
evident in high-time pumps. I would suggest that you check
the high and low pump settings with external gauges as
per TCM SB 97-3E, and pay particular attention to your
upper deck reference lines for any wear spots or holes.
Any damage to the lines will allow ambient air in and
cause problems also.
Also, there may be a restriction in the fuel flow divider
in the area of the port to the injector line to the #6 cylinder.
—BR
Leaking landing gear gearbox
Steve Chefan, Wellington, Florida
My landing gearbox is leaking. Who can rebuild
Q. it Are they available for exchange, or do I have
to remove mine and send it out
The first thing to verify is that the gearbox is
A. not overfilled with oil. With the plug removed,
the oil should only be high enough so that by turn -
ing the hand crank, it will bring up oil from the bottom
side of the shaft. An alternate way to check the level is
to use a dipstick. It should only have about 1 /4-inch of oil
showing on the dip stick when inserted beside the worm
gear shaft.
Hawker Beechcraft does offer an overhaul exchange
on most of the gearboxes; however, they are quite expensive.
If you can stand the down time, I suggest you
have your unit overhauled. Shops we have good reports
on are Aircraft Systems, Rockford IL (815-399-0225),
CruiseAir, Ramona, CA (760-789-8020), and B&S, Wichita
KS (316-264-2397). —AM
To submit your questions:
Go to the Members Only section of the ABS website
and click on Tech Tips (listed under Technical).
Volume 12 • Number 1 AMERICAN BONANZA SOCIETY 65