MD-11 Flight Crew Operations Manual
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Air -
Description and Operation
Air.10.2
Controls for pressurization, air conditioning, and anti-ice are on the overhead
panel. Air system flow, temperatures, valve positions, and pressurization status
are shown on the Systems Display (SD). Associated alerts are shown on the
Engine and Alert Display (EAD).
Air System Automatic Controllers
The air system automatic controllers work in conjunction with one another. One
environmental system controller (ESC) functions as the main controller. The ESC
monitors itself and other components, and detects and reports faults to a
centralized fault display screen (CFDS).
The ESC reverts to the manual mode for certain system and internal failures. The
air system can be controlled manually from the AIR control panel.
The ESC directs the following:
• Two Pneumatic System Controllers (PSC).
• Three Air Conditioning Controllers (ACC).
• Two Cabin Pressure Controllers (CPC).
• One Manifold Failure Controller (MFC).
These eight controllers:
• Manage the pneumatic system.
• Manage the air conditioning system.
• Manage the trim air system.
• Manage the recirculation fan system.
• Manage the equipment cooling fan systems.
• Control cabin pressurization.
• Monitor pneumatic system manifold failures.
• Monitor airfoil anti-ice systems.
• Shut down associated pneumatic system during APU or engine fire.
• Reconfigure air systems for failure of various elements.
• Compensate for inoperative components.
Manifold Failure Detection System
The Manifold Failure Detection System (MFDS) controller detects pneumatic
leaks in the following:
• The three pneumatic systems.
• The three air conditioning packs.
• The Center Accessory Compartment (CAC).
• The tail pylon area.
• The horizontal stabilizer anti-ice system.
October 02, 2006
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