Learjet 60 - EMER PRESS Light; PRESS SYS Light

Learjet 60

Pilot's Manual
to the indicator
is lost, the CABIN ALT and CABIN
RATE needles
will go to the
OFF position and the DIFF PRESS display
will go blank .
The DIFF PRESS
readout is capable of displaying
differential pressure
from 0 .0 to 9 .9 psid .
If the differential pressure exceeds the maximum
of 9 .8 psid, the display will flash . If
the differential pressure exceeds
0
.5
psid negative, the DIFF PRESS
readout will flash "0 .5" . The indica-
tor provides outputs for the
following :
" 8750 (±250)
feet cabin altitude - Illuminates
PRESS SYS caution
light if in the
manual mode .
" Activates cabin
altitude aural warning horn at :
° 10,100 (±250) feet cabin altitude
whenever the aircraft is above
25,000 feet pressure altitude .
° 10,100 (±250) feet cabin altitude if
the aircraft is below 25,000
feet pressure altitude and the
system detects takeoff or landing
at a field elevation less than 8000
feet .
° 14,500 (±250) feet cabin
altitude if the aircraft is
below 25,000
feet pressure altitude and the
system detects takeoff
or landing
at a field elevation greater
than 8000 feet .
" 14,500 (±250) feet cabin
altitude - Activates
automatic deploy-
ment of passenger oxygen
masks and turns
on cabin overhead
lighting .
" Differential
pressure exceeds - 0 .5 or
+ 9 .8 psid -
Illuminates
PRESS
SYS caution light .
PRESS SYS LIGHT
The
amber PRESS SYS caution
light, on the glareshield
annunciator
panel, illuminates to annunciate
the following
conditions :
Differential
pressure has exceeded
the limit (- 0 .5 to
+
9 .8
psid) .
In automatic
mode cabin altitude exceeds
:
° 14,500 (±250)
feet if the aircraft
is below 25,000
feet pressure al-
titude
and the system detects
takeoff or landing at a
field eleva-
tion
greater than 8000 feet .
° 8600 (±200)
feet for all other
conditions .
In manual
mode cabin altitude
exceeds 8750 (±250)
feet .
The
pressurization system
detects a fault .
EMER
PRESS LIGHT
The amber EMER PRESS
caution light, on the
glareshield
annunciator
panel, illuminates to
annunciate the following
conditions :
" The emergency
pressurization has
activated on
one or both sides .
" If emergency
pressurization has
not activated, an electrical
fault
exists which
may prevent activation of
emergency airflow
.
PM-123
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6-29
Change 3