Learjet 60 - Engine Chip Lights; Oil Pressure Lights

Pilot's Manual
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Learjet 60
OIL
PRESSURE LIGHTS
Red L
OIL PRESS and R
OIL PRESS warning lights are
installed in the
glareshield
annunciator
panel . In the event that either
engine's oil
pressure
drops below
approximately 20 psi, a pressure
switch con-
nected to
the oil pressure line
and oil scavenge line of
the affected en-
gine will cause
the applicable
light to illuminate . Also,
the applicable
light will be
illuminated
whenever electrical power is on
the aircraft
and the
corresponding engine
is not operating .
Electrical power for
system
operation is 28
VDC supplied
through the 7 .5-amp WARN
LTS
circuit breakers
on the pilot's and
copilot's circuit breaker panels
.
ENGINE CHIP
LIGHTS
Illumination
of either amber
L ENG CHIP or R ENG CHIP
light indi-
cates the
presence of
contaminants and debris in
the corresponding
engine's
oil system . The
lights are activated
by a magnetic chip detec-
tor
installed in the
scavenge oil passage of
each engine's accessory
gear
box .
ENG FILTERS LIGHT
Illumination of a
white ENG FILTERS light
on the glareshield annun-
ciator panel indicates
one or more of the
following conditions :
"
Impending bypass of
the respective engine
fuel
filter
"
Impending bypass of the
respective engine oil filter
"
Impending bypass of the
respective airframe-mounted
fuel filter
The
airframe-mounted fuel
filter circuit is wired
through the squat
switch
and may cause the
ENG FILTERS light to
illuminate only if the
aircraft
is on the ground .
The engine fuel filter circuit
is not wired
through the
squat switch and may
cause the ENG FILTERS
light to il-
luminate either
in flight or on
the ground . A maintenance
panel, in-
stalled
in the tailcone, is
utilized by maintenance
personnel to deter-
mine the specific filter causing
the ENG FILTERS
light to illuminate
and
to reset the system after
the corrective action has
been taken .
ENG VIB LIGHTS
Illumination of either
amber L ENG VIB or R ENG VIB light indicates
an abnormally high level
of vibration in the associated engine . The
lights are
activated by a signal
conditioning box located in the tail-
cone . A transducer
installed on a mounting pad
of each engine's inter-
mediate case provides
the trigger to initiate an
engine vibration
caution .
2-12
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PM-123
Original