AIRPLANE
OPERATIONS
MANUAL
PNEUMATICS
AIR CONDITIONING
AND PRESSURIZATION
JUNE 29, 2001
2-14-15
Page
7
Code
01
OPERATION IN MANUAL MODE
Manual operation is accomplished through the manual controller which
actuates only the pneumatic outflow valve, while the electropneumatic
outflow valve is kept closed, by selecting MAN in the Pressurization
Mode Selector Button and rotating the Manual Controller until the
desired cabin rate of change is reached. The crew is responsible for
monitoring cabin differential pressure within acceptable values.
In manual mode, the DUMP button is not effective and a rapid cabin
depressurization is commanded by turning the manual controller to the
UP position (clockwise stop). In this mode, the cabin altitude limitation
at 15000 ft does not exist as it does in the automatic mode.
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