Airplane Factory SLING 4
Pilot Operating Handbook
Page | 7-39
DC-POH-001-X-C-3
Revision : 1.3
Main fuel pump
Refer to paragraphs 7.19.1 and 7.19.2. The main fuel pump is connected to the
main bus. The pump is protected by a circuit breaker located on the instrument
panel. The pump cannot be operated when power to the main bus is removed
(i.e. the master switch is switched off) or there is a failure of the power supply
to the main bus.
Auxiliary fuel pump
Refer to paragraphs 7.19.1 and 7.19.2. The auxiliary fuel pump is connected to
the output of the charge system / rectifier and via the charge system relay to
the main battery and main bus (as long as the main bus is powered (i.e. the
master switch is on) and the charge system relay is energized / not failed). The
pump is protected by a circuit breaker located on the instrument panel.
If the charge system fails the auxiliary fuel pump can be operated via power
from the main bus, provided that the charge system relay remains energized / is
not failed, the master switch is on and there is no failure of the power supply to
the main bus.
If power is removed from the main bus (i.e. the master switch is switched off) or
there is a failure of the power to the main bus, or the charge system relay fails,
the charge system is disconnected from the main bus and battery. In this case
the auxiliary pump can be operated from the output of the charge system /
rectifier, provided that the charge system remains operational.
Summary of Contents for SLING 4
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