Air Systems SGR
Zone Temperature Control
There are three zones: flight deck, forward cabin and aft cabin.
Desired zone temperature is set by adjusting the individual
Temperature Selectors. The selector range is approximately
65°F (18°C) to 85°F (30°C).
The packs produce an air temperature that satisfies the zone
which requires the most cooling. Zone temperature is controlled
by introducing the proper amount of trim air to the zone supply
ducts. The quantity of trim air is regulated by individual trim air
modulating valves.
If air in a zone supply duct overheats, the associated amber
ZONE TEMP light illuminates, and the associated trim air
modulating valve closes.
There are three zones: flight deck, forward cabin and aft cabin.
Desired zone temperature is set by adjusting the individual
Temperature Selectors. The selector range is approximately
65°F (18°C) to 85°F (30°C).
The packs produce an air temperature that satisfies the zone
which requires the most cooling. Zone temperature is controlled
by introducing the proper amount of trim air to the zone supply
ducts. The quantity of trim air is regulated by individual trim air
modulating valves.
If air in a zone supply duct overheats, the associated amber
ZONE TEMP light illuminates, and the associated trim air
modulating valve closes.
B737-800/900 Air Distribution
Conditioned air is collected in the mix manifold. The temperature of
the air is directly related to the setting of the Temperature Selectors.
Overheat detection is provided by temperature sensors located
downstream of the packs and the mix manifold. An overheat
condition causes the appropriate trim air modulating valve to close
and the ZONE TEMP light to illuminate.
Conditioned air is collected in the mix manifold. The temperature of
the air is directly related to the setting of the Temperature Selectors.
Overheat detection is provided by temperature sensors located
downstream of the packs and the mix manifold. An overheat
condition causes the appropriate trim air modulating valve to close
and the ZONE TEMP light to illuminate.
CONT CAB
FWD CAB
AFT CAB
