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pressures for the selected LAND ALT and FLT ALT) is less than or equal to 7.8 psid
(7.45 psid with FLT ALT less than 28,000 ft).
AIR SYSTEMS
737 Sec. 6.2 Page 45
Flight Manual Continental Rev. 11/15/02 #41
Beginning descent, approximately 1,000 feet below cruise altitude, a descent
relay trips, scheduling the cabin to begin a proportional descent to the selected
LAND ALT. The controller programs the cabin to land slightly pressurized, so that
rapid changes in altitude during approach result in minimum cabin pressure
changes.
Taxiing in, the controller drives the main outflow valve slowly to full open when
the FLT/GRD switch is positioned to GRD, thereby depressurizing the cabin.
Having the main outflow valve full open also prevents the equipment cooling
fan from depressurizing the aircraft to a negative pressure.
An amber AUTO FAIL light illuminates if any one of three conditions occurs:
· Loss of AUTO AC power.
· Excessive rate of cabin pressure change (± 1800 sea level feet / minutes).
· High cabin altitude (13,875 feet).
With illumination of the AUTO FAIL light, the pressure controller automatically
trips to STANDBY mode, which illuminates the green STANDBY light; however, the
pressurization mode selector remains in AUTO. Positioning the mode selector to
STBY extinguishes the AUTO FAIL light.
* The controller senses only psi. References to altitudes are approximations
and vary according to density altitude. As the density of the air decreases,
the greater the change in altitude is for a given psi.
AIRCRAFT WITH CPCS & DCPCS >>@
AIR SYSTEMS
Sec. 6.2 Page 46 737
Rev. 11/15/02 #41 Continental Flight Manual
STANDBY MODE OPERATION (AIRCRAFT WITH CPCS)
A green STANDBY light will be illuminated when the pressure controller is in the
STANDBY mode.
On the ground, the GRD position of the FLT/GRD switch drives the main outflow
valve full open. The FLT position drives the main outflow valve to attempt to
pressurize the cabin to the selected CAB ALT. CAB ALT should be set 200 feet
below the takeoff airport altitude to pressurize the cabin properly when the
FLT/GRD switch is placed to FLT prior to takeoff.
In the air, by referring to a placard below the pressurization control panel, the
cabin altitude indicator is set to the isobaric cabin altitude, based on the
proposed flight altitude and pressure differential. Cabin rate of climb or descent
is controlled by the cabin rate selector. In descent, the cabin altitude indicator is
set 200 feet below landing field altitude to ensure a pressurized cabin during
landing.
MANUAL MODE OPERATION (AIRCRAFT WITH CPCS >@)
A green MANUAL light illuminates with the pressurization mode selector in MAN
AC or MAN DC.
Operation in the MAN modes assumes failure of the AUTO and STANDBY modes.
Manual mode allows the pilot, by using the outflow valve switch, to modulate
the main outflow valve while monitoring the outflow valve position indicator.
MAN AC mode uses the AC motor to control the main outflow valve; MAN DC uses
the DC motor. The rate of operation in MAN AC is faster than that in MAN DC.
AIR SYSTEMS
737 Sec. 6.2 Page 47
Flight Manual Continental Rev. 11/15/02 #41
CABIN ALTITUDE PANEL
< Cabin Altimeter / Differential Pressure Indicator
INNER SCALE – Indicates cabin altitude in feet.
OUTER SCALE – Indicates differential pressure between cabin and
ambient in psi.
= Altitude Horn Cutout Switch
PRESS – Cuts out intermittent cabin altitude warning horn.
· Altitude warning horn sounds when cabin reaches 10,000 feet altitude.
> Pressurization Limit Placard
· Maximum cabin differential pressure for takeoff and landing is .125
psi.
? Cabin Rate Of Climb Indicator
· Indicates cabin rate of climb or descent in feet per minute.
AIR SYSTEMS
Sec. 6.2 Page 48 737
Rev. 11/15/02 #41 Continental Flight Manual
CABIN PRESSURE CONTROL SYSTEM (CPCS) CONTROLS AND
INDICATORS – AUTOMATIC OPERATIONS >@
< Flight Altitude Indicator
· Indicates selected cruise flight altitude.
· Set before takeoff.
= Flight Altitude Selector
PUSH / ROTATE – To set planned cruise flight altitude.
> Landing Altitude Indicator
· Indicates altitude of intended landing field.
· Set before takeoff.
AIR SYSTEMS
737 Sec. 6.2 Page 49
Flight Manual Continental Rev. 11/15/02 #41
? Landing Altitude Selector
ROTATE – To select planned landing field altitude.
· Large diameter control sets to the nearest 1000 feet.
· Small diameter control sets to the nearest 10 feet.
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