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Q:
Combustion
heater fuel source
Dale Hemman
Steilacoom, Washington
I’m not finding in my POH
which fuel tank supplies the
heater in my B55 Baron. I do notice
that my JPI 960 shows a slightly
higher fuel flow from my left tank
when the engines are properly
leaned; however, I assumed that the
fuel transducer is located beyond the
point in the system where fuel would
be drawn off to supply the heater.
A:
The fuel system schematic
on page 7-22 of your POH is the only
mention that fuel for the Baron’s combustion heater
comes from the left inboard leading edge fuel cell. You’re
correct that the fuel flow indication in the cockpit (including
your JPI installation and any installed fuel totalizer) does not
measure this fuel flow; the difference you’re seeing in fuel
burn is an actual difference between engines. If they were
two IO-470 engines on two different Bonanzas you wouldn’t
have anything to compare them to, and wouldn’t notice
that one engine is developing more power and therefore
burning more fuel for a given MP/RPM combination and
leaning technique.
Various sources state at maximum output the combustion
heater burns between one quart and one gallon per hour
from the left inboard leading edge tank. —TT
Q:
Approach flap light
Ted Lewis, Phoenix, Arizona
Recently my A36’s approach flap light is very
dim. I changed the bulb and it remains dim.
When I press the annunciator button it shows up bright.
The other two flap lights appear bright in all positions. Any
thoughts on how to repair the dim light?
A:
The annunciator, dimmer, and press to test circuit
are parts of a complex system running through a
complicated circuit board called the A-19 junction board
assembly. The “press to test” button applies voltage to all
of the annunciators on the panel through the A-19 board.
Each annunciator also has its ground path run through the
A-19 board via diodes and multiple dimmer relays.
If the “press to test “ illuminates the annunciator normally,
this tells me that the light’s bulb, ground path, and A-19 board
circuitry are working properly and not compromised. It
also suggests that the normal voltage path may have some
increased resistance. I would check the voltage at the
socket with the flaps in the approach position. Be careful
not to short the socket as you may cause damage to the A-19
board. If the voltage is less than the 24 volts expected, trace
the wiring circuit voltage back through the approach flap
position switches and see where the voltage drops off. At the
point you find the drop, you will have found the damaged
component that is acting as the circuit’s resistor. —CB
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Volume 13 • Number 1 AMERICAN BONANZA SOCIETY 67