Learjet 25B - Pressurization System-Sns 24 B-185, -188 and -190 through -209, and 25-027 and -029 through -045

12A-5
FOR TRAINING PURPOSES ONLY
LEARJET 20 SERIES PILOT TRAINING MANUAL
FlightSafety
international
Figure 12A-4. Pressurization System — SNs 24B-185, -188 and -190 through -209, and
25-027 and -029 through -045
CABIN ALT
CONTROL
NORMAL OUTFLOW INTO
NOSE COMPARTMENT
CABIN PRESSURE-
RELIEF VALVE*
CABIN AIR EXHAUST
CONTROL VALVE
RH
SQUAT
SWITCH
AIR DISTRIBUTION
DUCT
VACUUM
REGULATOR
LH
SQUAT
SWITCH
SECONDARY
SOLENOID VALVE
SECONDARY
SOLENOID VALVE
FILTER
115 VAC
CHECK
VALVE
UP
ALT
DN
ALT
NORMAL
STATIC SOURCE
ALTERNATE
SOURCE
CABIN ALTITUDE
MANUAL CONTROL
VALVE
AUTO
MANUAL
UNDER
CABIN
PRESS
SWITCH
CABIN
UNDER
PRESS
SWITCH
CABIN PRESS
DUMP INTO
TAILCONE
PRESSURIZATION
JET PUMP
VENT INTO
TA ILCONE
28 VDC
AIR BLEED
AIR
AIR
GND
GND
TIME
DELAY
RELAY
TIME
DELAY
RELAY
28
VDC
DN
GEAR CONTROL
SWITCH
AIRCRAFT 25-040 THROUGH
25-045 ONLY
UP
FILTER
BLEED AIR
PRESSURE
REGULATOR
CABIN SAFETY
FILTER
NORMAL
STATIC SOURCE
*NOT INSTALLED ON 24B-190
AND SUBSEQUENT, AND
25-030 AND SUBSEQUENT
CONDITIONED AIR
REGULATED
PRESSURE
REGULATED
VACUUM
BLEED AIR
STATIC PRESSURE
CONTROL
PRESSURE
LEGEND