NO. 1 AIR DATA
COMPUTER
B
0
ALT
110
HORN AUTO MANUALSTANDBY
0
50
CUTOUT
V
9 2
CABIN40 ALT 5
A
35
00000 L
30
DECR INCRFLT ALT
8 3
V
X 1000 FEET 10
CABIN RATE
25
E 20
C
15
O
7 4
L00 000 PO
65
ECAB ALT S NE
00 000 PRESS DIFF LIMIT:TAKE-
LAND ALT STBY AC
21
OFF & LDG
MAN
.125 PSI 3
UP
F G AUTO DC 0
4
LR
DN
TD
CHECK 3
2 -.3 .8 1.9 2.9 3.9 5.0 5.1 6.0 6.8 7.6
1
CAB
1.4
2.4
3.4
4.4
5.0
5.6
6.4
7.2
8.0 18 .3 24 28 32 34 3622 26 3020
FLT
ALTITUDE X 1000 FEET-MAX PRESS SCHEDULE
FORWARD OVERHEAD PANEL (P5)
C
Pressurization Control System Component Location Figure 1
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21-31-00
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BOEING PROPRIETARY - Copyright (C) - Unpublished Work - See title page for details.
A
737-300/400/500MAINTENANCE MANUAL
B. Operation of the pressurization control system requires signals into the pressurization control system from direct ambient pressure sensing, barometric pressure correction and the landing gear ground safety sensor (AMM 32-09-00) for the automatic mode and from the air data computer (AMM 34-12-00/001), barometric correction and the landing gear ground safety sensor in the standby mode. Electrical circuit protection for the pressurization control system is provided by circuit breakers on the P6 circuit breaker panel.
2. Pressure Control Panel______________________
A. The pressure control panel includes four groupings of dials, switches, and indicators used in the operation of the pressurization control system. One grouping is for the automatic (AUTO) mode of operation, another is for the semiautomatic or standby mode, the third is for the manual mode, and the fourth is to allow choosing the desired mode of control and function available.
B. For the AUTO mode there is an adjusting knob and indicator (LAND ALT) for setting destination landing field altitude and another knob and indicator (FLT ALT) for setting cruise altitude.
C. Instruments for STANDBY consist of a cabin altitude adjusting knob (CAB ALT) and indicator and a cabin rate of pressure change (CAB RATE) knob. There is an index mark on the panel for the CAB RATE knob which marks the setting for approximately 300 feet per minute rate of change. CAB RATE range is from 50 to 2000 sea level ft/min.
D. The manual mode utilizes a three-position self-centering toggle switch for controlling the position of the outflow valve. The switch has momentary contacts for driving the outflow valve open or closed. Releasing the switch opens the contacts, stopping outflow valve movement. A position indicator is provided for monitoring outflow valve position in all modes.
E. The fourth section of the panel includes a five-position mode selector switch, CHECK, AUTO, STBY, AC and DC MAN; and a two-position FLT-GRD toggle switch. The FLT-GRD switch is used in conjunction with the mode selector switch and landing gear sensor switch to control minimum cabin pressurization on the ground when the mode selector is in AUTO or STBY, and to check the rate limit fault detector of the auto transfer when the mode selector is in the CHECK position. When the mode selector is in MAN AC or DC position, cabin pressurization is controlled directly by the use of the manual OPEN-CLOSE switch to actuate the outflow valve under ac or dc control, depending on the position of the selector switch.
3. Pressure Controller___________________
A. The pressure controller is an electronic unit which receives inputs from the pressurization control panel, airplane ambient pressure and cabin pressure, then positions the outflow valve to maintain proper differential pressure (Fig. 2).
B. Two completely independent pressure control system networks are contained within the pressure controller. The automatic system operates as a function of destination landing field altitude and cruise altitude while the standby system operates according to the selected cabin altitude and selected rate of cabin pressure change.
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