OPERATIONS MANUAL

Air Systems
Air Conditioning Controls:
Passenger zones temperature
selector (not on freighter)
AUTO Sets master temperature for
all passenger zones. Range is
18°C to 29°C (65°F to 85°F)
from C to W. Temperatures
are accordingly adjusted by a
zone temperature controller.
In cruise, and if system is not
in backup mode, flight attendants
can enter corrections by
±6°C on cabin temperature
panel at purser station. Range
limits cannot be exceeded. (In
simulator, flight attendant inputs
are generated randomly.)
ALTN Bypasses zone temperature
controller and deactivates
cabin temperature panel at
purser station. Zone trim
air valves remain in their
last positions. Pack output
temperature regulation aims
at average cabin temperature
of 24°C (75°F).
Flight deck temperature selector
AUTO Range is 18°C to 29°C (65°F to 85°F) from C
to W. Temperature is accordingly adjusted by
a zone temperature controller.
MAN Flight deck trim air valve under manual control.
Rotation from MAN to W, and holding
selector in W, moves trim air valve toward
open position to supply warmer air. Vice
versa: MAN to C for cooler air.
Lower aft cargo temperature
selector (not on freighter)
AUTO Range is 4°C to 27°C (39°F to
81°F) from C to W. Temperature
is accordingly adjusted by
a zone temperature controller.
MAN Aft cargo trim air valve under
manual control. Rotation from
MAN to W, and holding selector
in W, moves trim air valve
toward open position to supply
warmer air. Vice versa: MAN
to C for cooler air.
Zone reset switch
Push Resets zone temperature
control logic
unless fault still exists.
Reopens master trim air
valve if duct overheat is
no longer present.
SYS
FAULT
LIGHT
Zone duct overheat or
zone controller fault
except for aft cargo
zone, or master trim air
valve failure, or trim air
switch off.
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