Learjet 60 - Gear Blow down

Pilot's Manual
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Learjet 60
GEAR
BLOW DOWN
When the
EMERGENCY BLOW DOWN GEAR
lever on the right side
of the pedestal
is pushed full down (until
lever latches), air pressure
from the GEAR
AIR emergency air bottle is admitted
to the blow
down system
through the lever actuated
blow down valve . Since the
air pressure
is greater than the landing gear system
hydraulic pres-
sure, shuttle
valves in the landing gear
system will reposition to ad-
mit air
pressure to the landing gear
system inboard main gear door
and
door uplock actuators,
the main gear actuators, the nose
gear up-
lock
and gear actuators, the
gear control valve, and the door
control
valve . The gear and
door selector valves are positioned to
"down" to
prevent inadvertent
gear retraction . When the landing
gear is down
and locked, the three
green LOCKED DN lights will
illuminate . The
two
main gear red
UNSAFE lights will remain illuminated
after gear
extension due to the
inboard main gear doors remaining
open . When
emergency gear
blow down is selected, it is
not required that the
EMERGENCY
BLOW DOWN GEAR lever be
returned
to
the "up"
position prior to
landing . However, the lever
must be returned to the
"up"
position prior to servicing either
the GEAR AIR bottle or the hy-
draulic
system . The EMERGENCY
BLOW DOWN GEAR lever is re-
turned to the "up" position
by lifting the lever release (small metal
tab available through a small
hole immediately forward of the lever)
and pulling the lever to the full
up (latched) position .
3-12
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PM-123
Original