Learjet 60 - Clocks

Learjet 60
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Pilot's Manual
CLOCKS
Each instrument
panel is equipped with a multi-function chronome-
ter to display GMT, local time (LT), flight
time (FT), and elapsed time
(ET) . Power for the chronometers is 28 VDC supplied
through the l-
amp
L and R CLOCK circuit breakers on the pilot's
and copilot's cir-
cuit
breaker panels .
The
SEL button selects what is to be displayed
and the CTL button
controls
what is being displayed . Pressing SEL sequentially
selects
GMT,
LT, FT or ET for display . FT starts counting when the squat
switches transition to the
air mode and stops counting when they
transition back to ground mode . The CTL
button resets FT back to
zero when held down for 3
seconds . ET is started and reset when the
CTL button is
pushed momentarily . Depressing the SELand
CTL but-
tons simultaneously
enters the set mode and GMT or LT can be set
.
The CTL button is then
pressed to increment the flashing
digit to the
desired value . Pressing the
SEL button then enters that value
and tog-
gles to the next digit to be
set .
HOURMETER-AIRCRAFT
(OPTIONAL)
An optional hourmeter may be
installed to measure
aircraft accumu-
lated time . A typical location
for the hourmeter is behind the
carpeted
access panel on the step behind the
cockpit or in the
copilot's circuit
breaker
panel . It is wired to
the right squat switch
and will measure
accumulated time as soon as
the aircraft lifts off .
The hourmeter re-
ceives
28 VDC through the 1-amp
HOUR METER
circuit breaker on
the
copilot's circuit breaker
panel .
PM-123
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