Learjet 25 - Page 232

12-4
FOR TRAINING PURPOSES ONLY
LEARJET 20 SERIES PILOT TRAINING MANUAL
FlightSafety
international
UP
AUTO
MAN
DN
A
C
F
T
x
1
0
0
0
A
I
R
C
R
A
F
T
A
L
T
X
1
0
0
0
F
T
24
26
28
STATIC
PORT
UP
CABIN
PRESS
PRESS DIFF
RELIEF (8.9 PSI)
ALTERNATE
STATIC
PORT
SOL VALVE (N.O.)
ENERGIZED CLOSED
ON GND
PRESS DIFF
RELIEF (9.2 PSID)
CAB ALT LIM* 11,000 FT ± 1,000 FT
SOL VALVE (N.O.) ENERGIZED CLOSED IN MANUAL ABOVE 10,000 FT OR ON GND
DN
OUTFLOW VALVE
STATIC PRESS
NOSE CABIN
STATIC
FILTER
CABIN TAILCONE
SOL VALVE (NC) ENERGIZED OPEN ON GND
FILTER
CAB ALT LIMITER 11,000 FT ± 1,000 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
C
A
B
I
N
A
L
T
x
1
0
0
0
F
T
SL
1
2
3
45
6
7
8
9
10
*IF INSTALLED
Figure 12-3. Pressurization Control System Diagram—SNs 24-230 through -349
and 25-070 through -226