MD-11 Flight Crew Operations Manual
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Fire Protection Chapter Fire
Description and Operation Section 10
Fire.10.1
Fire.10 Fire Protection-Description and Operation
General
The fire protection system is a dual function system. The two functions are
detection and extinguishing.
The detection system detects fires in the engine nacelles, APU compartment, and
cargo compartments. It also detects smoke in the cargo compartments. The
extinguishing system will extinguish fires in any of these fire zones.
The detection system includes the following:
• Dual sensing elements in the engine nacelles and APU compartments.
• Separate heat and smoke detectors in the cargo compartment.
• Single smoke detector in each lavatory.
• Fire Detection Control Units (FDCU) (Engine 1, 2, 3, and APU).
• Control switches and lights on the aft overhead panel.
• EAD alerts, AIR synoptic smoke/heat symbology, engine fire bells and
aural warning.
The extinguishing system includes pressurized agent storage bottles installed near
the fire zone they protect. With the exception of the lavatory, discharge of the
extinguishing agent is accomplished with controls located in the cockpit. Agent
can be discharged to the APU by ground personnel from the external APU control
panel behind the left main gear well.
The cargo area is divided into two class C compartments, forward and center/aft.
The center/aft compartment is considered a single compartment for fire protection
purposes.
Fire protection system alerts are displayed on the EAD. MASTER WARNING
lights on the glareshield illuminate when a fire detection system is activated.
Engine and APU Fire Detection
The system includes dual sensing elements, control units and circuits, MASTER
WARNING lights, control switches, aural fire warning accompanied by alerts on
the EAD for the engines, and an external alarm horn for the APU.
An FDCU for each engine and the APU contains dual channels in a single unit.
Each channel operates from a single sensing element or loop. The loops are
mounted in close proximity on the same support structure along the routing. The
outputs of the channels are integrated so that fire signals from both operative loops
must be received to result in a fire alarm.
October 02, 2006
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