Learjet 60 - Emergency Air Pressure Indicator; Emergency Air System

INIOVS Manual

Lealet 60
EMERGENCY AIR SYSTEM
Two emergency air bottles (3000 psi) are installed
to provide alternate
gear extension and emergency braking in the
event of an electrical or
hydraulic system failure . One
bottle provides air pressure to operate
the emergency
gear extension blow down system and the other bottle
provides
air
pressure to operate the emergency brakes and
emergency
gear extension free fall systems . On aircraft 60-001 thru
60-103, the emer-
gency air bottles are installed in the right
nose compartment . On aircraft
60-104 and subsequent, one emergency air bottle is installed behind the
left wing/fuselage fairing, and the other is installed behind the right
wing/fuselage fairing . Refer to
LANDING GEAR ALTERNATE
EXTET0112IN
and
EMERGENCY
BRAKES
for
system operation .
EMERGENCY AIR PRESSURE INDICATOR
The emergency air pressure indicator is a vertical
scale, dual-reading
instrument and is
located
on the
center switch panel adjacent to the hy-
draulic
pressure indicator . The indicator face consists of a center scale
reading from 0 to 4000 psi in 500 psi increments and two pointers
on op-
posite margins of the scale . The left margin is
labeled GEAR AIR and
the right
margin
is labeled
BRAKE AIR . The indicator pointers are op-
erated by
transducers plumbed to the corresponding emergency air
bottles . The GEAR AIR pointer indicates the state of charge for the air
bottle operating the alternate gear extension blow down system
and
be BRAKE
AIR
pointer
indicates the
state of charge for the air bottle
operating the emergency
braking and alternate gear extension free fall
systems
.
The indicator operates on 28 VDC supplied through the l-
amp AIR PRESS IND circuit breaker on the copilot's circuit
breaker
panel . Refer to Airplane Flight Manual for
instrument limit markings .