Learjet 60 - Landing Gear Alternate Extension

Learjet 60

Pilot's Manual
LANDING GEAR
ALTERNATE EXTENSION
In the event of a main
hydraulic system failure or an electrical
system
malfunction, the landing gear
can be extended pneumatically . Pneu-
matic
gear extension can be accomplished
by using either the alter-
nate gear
blow down system or the
alternate gear free fall system .
However,
to assure adequate emergency
air supply for emergency
braking
(hydraulic system failure) or
to assure hydraulic pressure
can
be regained
(electrical malfunction), it
is recommended that blow
down be selected first
. If an attempt to blow
down the gear is unsuc-
cessful, alternate gear
free fall should be selected .
Air pressure to op-
erate the blow down system is
supplied by the GEAR
AIR emergency
air bottle
and is controlled by
the EMERGENCY BLOW
DOWN
GEAR lever
on the right side of the
pedestal . Air pressure to
operate
the free fall
system is supplied by
the BRAKE AIR
emergency air bot-
tle and is
controlled by the
EMERGENCY FREE FALL
GEAR lever on
the
right side of the pedestal
forward of the blow down
lever . When-
ever
alternate gear extension is to
be selected, the
LANDING GEAR
selector
switch should be placed
in the DN position
and the GEAR
circuit
breaker on the copilot's
circuit breaker
panel should be
pulled .
This will prevent
inadvertent gear retraction
in the event
electrical
power to the system
is regained .
PM-123
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Original