7-60
ENSTROM 480B OPERATOR'S MANUAL
Rev.
24
Report No. 28-AC-023
May 2/19
NOTE
On S/N’s 5039-5076 and 5078-5084, the
generator switch will be automatically tripped
OFF if the engine starter button is pushed. It
must be placed ON after the engine start is
complete. On S/N’s 5077, 5085 and subs., the
generator switch must manually be cycled to
RESET then ON if the starter button is pushed
with the generator switch ON.
4. N1-N2-NR-TOT Switch. The
N1-N2-NR-TOT
switch (Figure 7-10.1), located at the top right side of the
instrument panel, controls the emergency electrical power
circuits that provide power to the gas producer (N
1
)
tachometer, Dual (N
2
/N
R
) tachometer, and the TOT
indicator incase of a complete electrical system failure.
Emergency power is supplied to the indicators by moving
the switch from the
BUS
position to the
BATT
position. The
emergency electrical power circuits are protected by the N1,
N2, NR, and TOT circuit breakers located on the right side
of the back wall in the engine compartment (Figure 7-11).
A yellow LED, located next to the switch, illuminates when
the switch is in the
BATT
position.
NOTE
Early 480B’s are equipped with a gas producer
tachometer which does not require aircraft
electrical power for operation. The emergency
electrical power switch in these aircraft is
labeled N2-NR-TOT.
5.
Avionics
Master
Switch.
The
AVI MSTR
switch
(Figure 7-4), located at the top of the center pedestal panel,
controls and provides electrical power to the avionics
bus. Equipment such as GPS/Nav/Com, transponder,
CDI, HSI, or EHSI, or other avionic units are typically
connected to the avionics bus. Switching the
AVI MSTR
to
the OFF position disconnects electrical power to the
avionics bus.
