MD-11 Flight Crew Operations Manual
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Air -
Description and Operation
Air.10.5
The CAC has two cooling fans. Operation of the fans is similar to those in the
avionics compartment. If the last available fan does not produce flow within a
specified time after being turned on, a CAC AIR FLO OFF alert is displayed.
Lavatory and Galley Ventilation System
The lavatory and galley ventilation system provides separate ventilation for each
area.
Lavatories are individually vented by an exhaust fan system and an individual air
system. Exhaust air discharges to the utility tunnels and then overboard through
the cabin outflow valve. An individual cooling gasper fan system supplies
supplemental air.
After exiting the lavatory, exhaust air passes over a smoke detector sensor for fire
detection. The exhaust fans automatically shut off when smoke is detected.
Galleys, if installed, are ventilated by jet pumps powered by bleed air. The
forward/center galleys use pneumatic manifold 1 bleed air. The aft galleys use
pneumatic manifold 2 bleed air. The jet pumps force the galley air into the left
utility tunnel at the cabin air outflow valve. It then vents overboard.
Tunnel Ventilation System
The tunnel ventilation system uses a fan to pull air from the cabin and distribute it
to the area under the cabin floor. The fan operates on the ground only.
Forward Cargo Compartment Heating and Ventilation System
The forward cargo compartment is heated, ventilated, and cooled inflight.
Pneumatic system 3 bleed air heats the compartment. Temperature sensors
maintain the temperature, as selected by the flight crew. Animals may be carried
in this compartment.
A flow detector in the ventilation and cooling system signals an insufficient air
flow condition to the flight crew. Flow-through ventilation, for animal transport,
exits through a sidewall outlet, thus relieving compartment pressure.
The Miscellaneous Systems Controller (MSC) automatically shuts off the
ventilation system if a compartment fire is detected. The flight crew manually
latches off airflow to the compartment. This prevents dilution of the firex agent,
and airflow does not resume when the smoke or fire signal ends. The firex agent
remains isolated inside the compartment when check valves close.
Center Cargo Compartment Heating System
The center cargo compartment is heated but not ventilated. Pneumatic system 2
bleed air heats the center compartment.
October 02, 2006
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