MilViz Beechcraft Baron 55, Pilot Operating Handbook

Page: 127 / 139

BEECHCRAFT Baron B55
Version 1.0 – 15 May 2012
[127]
Figure 74
In the cruise power range the green sectors cover the fuel pressure required from 45% to 75% power.
The lower edge of each sector is the normal-lean setting and the upper range is the best power setting
for that particular power range. The takeoff and climb range is covered by green sectors for full power
at various altitudes. The full power markings represent the maximum performance mixtures for the
altitudes shown, permitting leaning of the mixture for maximum power and performance during high
altitude takeoffs and full power climbs.
FUEL CROSSFEED
The fuel lines for the engines are interconnected by crossfeed lines. During normal operation each
engine uses its own fuel pumps to draw fuel from its respective wing fuel system. However, on
emergency crossfeed operations either engine can consume the available fuel from the opposite side.
The fuel crossfeed system is provided for use during emergency conditions. The system cannot be used
to transfer fuel from one wing system to the other. The procedure for using the crossfeed system is
described in the EMERGENCY PROCEDURES section.
AUXILIARY FUEL PUMPS
An individual two-speed electric auxiliary fuel pump is provided for each
engine. They are located on the right half of the pilot’s lower switch
panel (figure 75).
HIGH pressure, OFF or LOW pressure is selected with each auxiliary fuel
pump switch on the pilot's subpanel. High pressure is used for providing
fuel pressure before starting, and provides near aximum engine
performance should the engine-driven pump fail. Low pressure may be
used in any operating mode to eliminate pressure fluctuations resulting
from high ambient temperatures and/or high altitudes. The high
Figure 75