Learjet 24D - Page 230

12-2
FOR TRAINING PURPOSES ONLY
LEARJET 20 SERIES PILOT TRAINING MANUAL
FlightSafety
international
Figure 12-1. Pressurization Control System Diagram—SNs 24-350 and Subsequent,
and 25-227 and Subsequent
UP
AUTO
MAN
DN
A
C
F
T
x
1
0
0
0
INCR
RATE
C
O
N
T
R
O
L
L
E
R
C
A
B
I
N
C
A
B
I
N
A
L
T
-
F
T
2
3
1
0
30
25
STATIC
PORT
UP
CABIN
PRESS
PRESS DIFF
RELIEF (9.4 PSI)
ALTERNATE
STATIC
PORT
SOL VALVE (N.O.)
ENERGIZED CLOSED
ON GND
SOL VALVE (NC)
ENERGIZED OPEN
ON GND WITH
CAB AIR OFF
PRESS DIFF
RELIEF (9.7 PSID)
CAB ALT LIM 11,500 FT ± 1,500 FT
SOL VALVE (N.O.) ENERGIZED CLOSED IN MANUAL ABOVE 8,750 ± 250 FT OR ON GND CABIN ALT LIGHT
DN
OUTFLOW VALVE
STATIC PRESS
NOSE CABIN
STATIC
FILTER
CABIN TAILCONE
SOL VALVE (NC) ENERGIZED OPEN ON GND
CONTROL PRESSURE
(VACUUM) SOURCE
FILTER
CAB ALT LIMITER 11,500 FT ± 1,500 FT
CABIN PRESS
ENG
BLEED AIR
FILTER
REG
JET PUMP
SAFETY VALVE
ORIFICE
STATIC
PORT
ENGINE BLEED AIR VACUUM CONTROL PRESSURE
LEGEND
STATIC PRESSURE CABIN PRESSURE
MODIFIED CONTROL PRESSURE