Learjet 35A - Pressurization System Operation

111.111 ••••••
PRESSURIZATION SYSTEM OPERATION
For Automatic Mode operation, refer to BEFORE
STARTING ENGINES, AFTER TAKEOFF and OE- I
SCENT procedures in this section.
MANUAL MODE 0PERA110N
1. AUTO-MAN Switch - MAN.
2. UP-ON Manual Control (red) - As required to maintain satisfactory
pressurization.
3. To return to automatic operation, proceed as follows:
-Aircraft 35-067 thru 35-112 except 35-107, 36-018 thru
36-031:
If cabin altitude should increase to 10,000 (±500) feet
or above, the automatic mode is deactivated until the
cabin altitude is decreased to 7500 feet or below.
a. CABIN
ALT Controller - Set at or below 7500 feet.
b. RATE Knob - Turn to full INCR.
c.
UP-ON Manual Control (red) - Control to altitude selected on
CABIN ALT Controller.
d. CABIN CUMB
Speed Indicator - Stabilize at zero.
e. RATE Knob - Reset to nominal position.
f. AUTO-MAN Switch - AUTO.
g. CABIN ALT Controller - Reset (if required) to appropriate
cabin altitude for flight altitude.
-Aircraft 35-107, 35-113 & Subsequent and 36-032 &
Subsequent:
-~ If cabin altitude should increase to 8750 (±250) feet or
~, above, the automatic pressurization mode is deactivated
and the amber CAB ALT light will illuminate. Automatic
mode operation will not be available until the cabin alti-
tude is decreased
to extinguish the CAB ALT light.
a. CABIN CONTROLLER - Set at or below 7200 feet.
b.
UP-ON Manual Control (red) - Control to altitude selected on
Cabin Controller.
c. AUTO-MAN Switch -
AUTO.
d. CABIN CONTROLLER - Reset (if required) to appropriate
cabin altitude for flight altitude.
FAA APPROVED 4-30-76
REISSUED 2-25-81, CHANGE 10
2-45