Learjet 60 - GEN RESET Switches; Start Lights

Pilot's Manual

Learjet 60
begin to spool the
engine and the START light
will illuminate . When
' N2 reaches
approximately 6%, the FADEC
automatically activates the
ignition system
and turns on fuel flow to the
engine . When N2 reaches
approximately
40%, the ignition will
automatically terminate . When
N2 reaches
approximately 45%, a speed
sensor in the starter/
generator will cause power
to be removed from
the starter relay (start-
er
will be de-energized
and the START light
will extinguish) and from
the FADEC start
sequence relay (discrete start
signal to FADEC will
be removed and the
corresponding motive
flow valve will open) .
When the switch is
moved out of the
START position, the
correspond-
ing standby pump
will shut down
. If the associated thrust
lever is not
in the IDLE detent,
ignition and
fuel flow will not occur
as stated
above .
GEN position
: During the engine
start sequence, when engine
RPM
reaches
idle speed, the
START-GEN switch should be
set to GEN .
When
GEN is selected,
the corresponding generation
circuits will be
activated .
The generator
will not come on-line with a GPU
connected .
Additionally, the cooling
and auxiliary heating systems,
and stabilizer
heat system cutout relays
will be reset . The generation
circuits acti-
vate and control the
corresponding generator through
the generator
control unit .
START LIGHTS
Amber lights
adjacent to each START-GEN
switch are installed to in-
dicate starter
operation . The corresponding
light will be illuminated
whenever the associated starter is energized .
GEN RESET SWITCHES
The GEN RESET buttons
are located on the pilot's switch panel adja-
cent to the START-GEN
switches . Should a generator fault occur, the
corresponding generator
control unit will de-energize the affected
generator field
circuit and open the generator relay isolating the gen-
erator from the respective
generator bus . Momentarily depressing the
applicable GEN RESET button
will reset the generator by closing the
affected generator field circuit and closing the generator relay . The
GEN RESET buttons have no effect with the corresponding START-
GEN switch OFF or the corresponding START and/or GEN circuit
breaker open .
4-4

PM-123
Change 2